Adding upstream version 2.4.38.upstream/2.4.38upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

36 files changed, 15550 insertions, 0 deletions

diff --git a/server/mpm/MPM.NAMING b/server/mpm/MPM.NAMING
new file mode 100644
index 0000000..c07884d
--- /dev/null
+++ b/server/mpm/MPM.NAMING
@@ -0,0 +1,14 @@
+
+The following MPMs currently exist:
+
+  prefork ....... Multi  Process Model with Preforking (Apache 1.3)
+  mpmt_os2 ...... Multi Process Model with Threading on OS/2
+                  Constant number of processes, variable number of threads.
+                  One acceptor thread per process, multiple workers threads.
+  winnt ......... Single Process Model with Threading on Windows NT
+  event ......... Multi Process model with threads.  One acceptor thread,
+                  multiple worker threads, separate poller threads for idle
+                  connections and asynchoneous write completion.
+  worker ........ Multi Process model with threads.  One acceptor thread,
+                  multiple worker threads.
+  netware ....... Multi-threaded MPM for Netware
diff --git a/server/mpm/Makefile.in b/server/mpm/Makefile.in
new file mode 100644
index 0000000..a158f8b
--- /dev/null
+++ b/server/mpm/Makefile.in
@@ -0,0 +1,4 @@
+
+SUBDIRS = $(MPM_SUBDIRS)
+
+include $(top_builddir)/build/rules.mk
diff --git a/server/mpm/config.m4 b/server/mpm/config.m4
new file mode 100644
index 0000000..6d3ab86
--- /dev/null
+++ b/server/mpm/config.m4
@@ -0,0 +1,128 @@
+dnl common platform checks needed by MPMs, methods for MPMs to state
+dnl their support for the platform, functions to query MPM properties
+
+APR_CHECK_APR_DEFINE(APR_HAS_THREADS)
+
+have_threaded_sig_graceful=yes
+case $host in
+    *-linux-*)
+        case `uname -r` in
+          2.0* )
+            dnl Threaded MPM's are not supported on Linux 2.0
+            dnl as on 2.0 the linuxthreads library uses SIGUSR1
+            dnl and SIGUSR2 internally
+            have_threaded_sig_graceful=no
+          ;;
+        esac
+    ;;
+esac
+
+dnl See if APR supports APR_POLLSET_THREADSAFE.
+dnl XXX This hack tests for the underlying functions used by APR when it supports
+dnl XXX APR_POLLSET_THREADSAFE, and duplicates APR's Darwin version check.
+dnl A run-time check for
+dnl     apr_pollset_create(,,APR_POLLSET_THREADSAFE) == APR_SUCCESS
+dnl would be great but an in-tree apr (srclib/apr) hasn't been built yet.
+
+AC_CACHE_CHECK([whether APR supports thread-safe pollsets], [ac_cv_have_threadsafe_pollset], [
+    case $host in
+        *-apple-darwin[[1-9]].*)
+            APR_SETIFNULL(ac_cv_func_kqueue, [no])
+            ;;
+    esac
+    AC_CHECK_FUNCS(kqueue port_create epoll_create)
+    if test "$ac_cv_func_kqueue$ac_cv_func_port_create$ac_cv_func_epoll_create" != "nonono"; then
+        ac_cv_have_threadsafe_pollset=yes
+    else
+        ac_cv_have_threadsafe_pollset=no
+    fi
+])
+
+dnl See if APR has skiplist
+dnl The base httpd prereq is APR 1.4.x, so we don't have to consider
+dnl earlier versions.
+case $APR_VERSION in
+    1.4*)
+        apr_has_skiplist=no
+        ;;
+    *)
+        apr_has_skiplist=yes
+esac
+
+dnl See if this is a forking platform w.r.t. MPMs
+case $host in
+    *mingw32* | *os2-emx*)
+        forking_mpms_supported=no
+        ;;
+    *)
+        forking_mpms_supported=yes
+        ;;
+esac
+
+dnl APACHE_MPM_SUPPORTED(name, supports-shared, is_threaded)
+AC_DEFUN([APACHE_MPM_SUPPORTED],[
+    if test "$2" = "yes"; then
+        eval "ap_supported_mpm_$1=shared"
+        ap_supported_shared_mpms="$ap_supported_shared_mpms $1 "
+    else
+        eval "ap_supported_mpm_$1=static"
+    fi
+    if test "$3" = "yes"; then
+        eval "ap_threaded_mpm_$1=yes"
+    fi
+])dnl
+
+dnl APACHE_MPM_ENABLED(name)
+AC_DEFUN([APACHE_MPM_ENABLED],[
+    if ap_mpm_is_enabled $1; then
+        :
+    else
+        eval "ap_enabled_mpm_$1=yes"
+        ap_enabled_mpms="$ap_enabled_mpms $1 "
+    fi
+])dnl
+
+ap_mpm_is_supported ()
+{
+    eval "tmp=\$ap_supported_mpm_$1"
+    if test -z "$tmp"; then
+        return 1
+    else
+        return 0
+    fi
+}
+
+ap_mpm_supports_shared ()
+{
+    eval "tmp=\$ap_supported_mpm_$1"
+    if test "$tmp" = "shared"; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+ap_mpm_is_threaded ()
+{
+    if test "$mpm_build" = "shared" -a ac_cv_define_APR_HAS_THREADS = "yes"; then
+        return 0
+    fi
+
+    for mpm in $ap_enabled_mpms; do
+        eval "tmp=\$ap_threaded_mpm_$mpm"
+        if test "$tmp" = "yes"; then
+            return 0
+        fi
+    done
+    return 1
+}
+
+ap_mpm_is_enabled ()
+{
+    eval "tmp=\$ap_enabled_mpm_$1"
+    if test "$tmp" = "yes"; then
+        return 0
+    else
+        return 1
+    fi
+}
diff --git a/server/mpm/config2.m4 b/server/mpm/config2.m4
new file mode 100644
index 0000000..d7e73ec
--- /dev/null
+++ b/server/mpm/config2.m4
@@ -0,0 +1,89 @@
+AC_MSG_CHECKING(which MPM to use by default)
+AC_ARG_WITH(mpm,
+APACHE_HELP_STRING(--with-mpm=MPM,Choose the process model for Apache to use by default.
+                          MPM={event|worker|prefork|winnt}
+                          This will be statically linked as the only available MPM unless
+                          --enable-mpms-shared is also specified.
+),[
+    default_mpm=$withval
+    AC_MSG_RESULT($withval);
+],[
+    dnl Order of preference for default MPM: 
+    dnl   The Windows and OS/2 MPMs are used on those platforms.
+    dnl   Everywhere else: event, worker, prefork
+    if ap_mpm_is_supported "winnt"; then
+        default_mpm=winnt
+        AC_MSG_RESULT(winnt)
+    elif ap_mpm_is_supported "mpmt_os2"; then
+        default_mpm=mpmt_os2
+        AC_MSG_RESULT(mpmt_os2)
+    elif ap_mpm_is_supported "event"; then
+        default_mpm=event
+        AC_MSG_RESULT(event)
+    elif ap_mpm_is_supported "worker"; then
+        default_mpm=worker
+        AC_MSG_RESULT(worker - event is not supported)
+    else
+        default_mpm=prefork
+        AC_MSG_RESULT(prefork - event and worker are not supported)
+    fi
+])
+
+APACHE_MPM_ENABLED($default_mpm)
+
+AC_ARG_ENABLE(mpms-shared,
+APACHE_HELP_STRING(--enable-mpms-shared=MPM-LIST,Space-separated list of MPM modules to enable for dynamic loading.  MPM-LIST=list | "all"),[
+    if test "$enableval" = "no"; then
+        mpm_build=static
+    else
+        mpm_build=shared
+dnl     Build just the default MPM if --enable-mpms-shared has no argument.
+        if test "$enableval" = "yes"; then
+            enableval=$default_mpm
+        fi
+        for i in $enableval; do
+            if test "$i" = "all"; then
+                for j in $ap_supported_shared_mpms; do
+                    eval "enable_mpm_$j=shared"
+                    APACHE_MPM_ENABLED($j)
+                done
+            else
+                i=`echo $i | sed 's/-/_/g'`
+                if ap_mpm_supports_shared $i; then
+                    eval "enable_mpm_$i=shared"
+                    APACHE_MPM_ENABLED($i)
+                else
+                    AC_MSG_ERROR([MPM $i does not support dynamic loading.])
+                fi
+            fi
+        done
+    fi
+], [mpm_build=static])
+
+for i in $ap_enabled_mpms; do
+    if ap_mpm_is_supported $i; then
+        :
+    else
+        AC_MSG_ERROR([MPM $i is not supported on this platform.])
+    fi
+done
+
+if test $mpm_build = "shared"; then
+    eval "tmp=\$enable_mpm_$default_mpm"
+    if test "$tmp" != "shared"; then
+        AC_MSG_ERROR([The default MPM ($default_mpm) must be included in --enable-mpms-shared.  Use --with-mpm to change the default MPM.])
+    fi
+fi
+
+APACHE_FAST_OUTPUT(server/mpm/Makefile)
+
+if test $mpm_build = "shared"; then
+    MPM_LIB=""
+else
+    MPM_LIB=server/mpm/$default_mpm/lib${default_mpm}.la
+    MODLIST="$MODLIST mpm_${default_mpm}"
+fi
+
+MPM_SUBDIRS=$ap_enabled_mpms
+APACHE_SUBST(MPM_SUBDIRS)
+APACHE_SUBST(MPM_LIB)
diff --git a/server/mpm/event/Makefile.in b/server/mpm/event/Makefile.in
new file mode 100644
index 0000000..f34af9c
--- /dev/null
+++ b/server/mpm/event/Makefile.in
@@ -0,0 +1 @@
+include $(top_srcdir)/build/special.mk
diff --git a/server/mpm/event/config.m4 b/server/mpm/event/config.m4
new file mode 100644
index 0000000..c891c75
--- /dev/null
+++ b/server/mpm/event/config.m4
@@ -0,0 +1,15 @@
+AC_MSG_CHECKING(if event MPM supports this platform)
+if test $forking_mpms_supported != yes; then
+    AC_MSG_RESULT(no - This is not a forking platform)
+elif test $ac_cv_define_APR_HAS_THREADS != yes; then
+    AC_MSG_RESULT(no - APR does not support threads)
+elif test $have_threaded_sig_graceful != yes; then
+    AC_MSG_RESULT(no - SIG_GRACEFUL cannot be used with a threaded MPM)
+elif test $ac_cv_have_threadsafe_pollset != yes; then
+    AC_MSG_RESULT(no - APR_POLLSET_THREADSAFE is not supported)
+elif test $apr_has_skiplist != yes; then
+    AC_MSG_RESULT(no - APR skiplist is not available, need APR 1.5.x or later)
+else
+    AC_MSG_RESULT(yes)
+    APACHE_MPM_SUPPORTED(event, yes, yes)
+fi
diff --git a/server/mpm/event/config3.m4 b/server/mpm/event/config3.m4
new file mode 100644
index 0000000..09d3626
--- /dev/null
+++ b/server/mpm/event/config3.m4
@@ -0,0 +1,7 @@
+dnl ## XXX - Need a more thorough check of the proper flags to use
+
+APACHE_SUBST(MOD_MPM_EVENT_LDADD)
+
+APACHE_MPM_MODULE(event, $enable_mpm_event, event.lo,[
+    AC_CHECK_FUNCS(pthread_kill)
+], , [\$(MOD_MPM_EVENT_LDADD)])
diff --git a/server/mpm/event/event.c b/server/mpm/event/event.c
new file mode 100644
index 0000000..4cfb09c
--- /dev/null
+++ b/server/mpm/event/event.c
@@ -0,0 +1,3912 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This MPM tries to fix the 'keep alive problem' in HTTP.
+ *
+ * After a client completes the first request, the client can keep the
+ * connection open to send more requests with the same socket.  This can save
+ * significant overhead in creating TCP connections.  However, the major
+ * disadvantage is that Apache traditionally keeps an entire child
+ * process/thread waiting for data from the client.  To solve this problem,
+ * this MPM has a dedicated thread for handling both the Listening sockets,
+ * and all sockets that are in a Keep Alive status.
+ *
+ * The MPM assumes the underlying apr_pollset implementation is somewhat
+ * threadsafe.  This currently is only compatible with KQueue and EPoll.  This
+ * enables the MPM to avoid extra high level locking or having to wake up the
+ * listener thread when a keep-alive socket needs to be sent to it.
+ *
+ * This MPM does not perform well on older platforms that do not have very good
+ * threading, like Linux with a 2.4 kernel, but this does not matter, since we
+ * require EPoll or KQueue.
+ *
+ * For FreeBSD, use 5.3.  It is possible to run this MPM on FreeBSD 5.2.1, if
+ * you use libkse (see `man libmap.conf`).
+ *
+ * For NetBSD, use at least 2.0.
+ *
+ * For Linux, you should use a 2.6 kernel, and make sure your glibc has epoll
+ * support compiled in.
+ *
+ */
+
+#include "apr.h"
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_file_io.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+#include "apr_thread_mutex.h"
+#include "apr_poll.h"
+#include "apr_ring.h"
+#include "apr_queue.h"
+#include "apr_atomic.h"
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+#include "apr_version.h"
+
+#include <stdlib.h>
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#if APR_HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+#ifdef HAVE_SYS_PROCESSOR_H
+#include <sys/processor.h>      /* for bindprocessor() */
+#endif
+
+#if !APR_HAS_THREADS
+#error The Event MPM requires APR threads, but they are unavailable.
+#endif
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h"        /* for read_config */
+#include "http_core.h"          /* for get_remote_host */
+#include "http_connection.h"
+#include "http_protocol.h"
+#include "ap_mpm.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "scoreboard.h"
+#include "mpm_fdqueue.h"
+#include "mpm_default.h"
+#include "http_vhost.h"
+#include "unixd.h"
+#include "apr_skiplist.h"
+
+#include <signal.h>
+#include <limits.h>             /* for INT_MAX */
+
+
+/* Limit on the total --- clients will be locked out if more servers than
+ * this are needed.  It is intended solely to keep the server from crashing
+ * when things get out of hand.
+ *
+ * We keep a hard maximum number of servers, for two reasons --- first off,
+ * in case something goes seriously wrong, we want to stop the fork bomb
+ * short of actually crashing the machine we're running on by filling some
+ * kernel table.  Secondly, it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_SERVER_LIMIT
+#define DEFAULT_SERVER_LIMIT 16
+#endif
+
+/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT.  We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_SERVER_LIMIT
+#define MAX_SERVER_LIMIT 20000
+#endif
+
+/* Limit on the threads per process.  Clients will be locked out if more than
+ * this are needed.
+ *
+ * We keep this for one reason it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_THREAD_LIMIT
+#define DEFAULT_THREAD_LIMIT 64
+#endif
+
+/* Admin can't tune ThreadLimit beyond MAX_THREAD_LIMIT.  We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_THREAD_LIMIT
+#define MAX_THREAD_LIMIT 100000
+#endif
+
+#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
+
+#if !APR_VERSION_AT_LEAST(1,4,0)
+#define apr_time_from_msec(x) (x * 1000)
+#endif
+
+#ifndef MAX_SECS_TO_LINGER
+#define MAX_SECS_TO_LINGER 30
+#endif
+#define SECONDS_TO_LINGER  2
+
+/*
+ * Actual definitions of config globals
+ */
+
+#ifndef DEFAULT_WORKER_FACTOR
+#define DEFAULT_WORKER_FACTOR 2
+#endif
+#define WORKER_FACTOR_SCALE   16  /* scale factor to allow fractional values */
+static unsigned int worker_factor = DEFAULT_WORKER_FACTOR * WORKER_FACTOR_SCALE;
+    /* AsyncRequestWorkerFactor * 16 */
+
+static int threads_per_child = 0;           /* ThreadsPerChild */
+static int ap_daemons_to_start = 0;         /* StartServers */
+static int min_spare_threads = 0;           /* MinSpareThreads */
+static int max_spare_threads = 0;           /* MaxSpareThreads */
+static int active_daemons_limit = 0;        /* MaxRequestWorkers / ThreadsPerChild */
+static int active_daemons = 0;              /* workers that still active, i.e. are
+                                               not shutting down gracefully */
+static int max_workers = 0;                 /* MaxRequestWorkers */
+static int server_limit = 0;                /* ServerLimit */
+static int thread_limit = 0;                /* ThreadLimit */
+static int had_healthy_child = 0;
+static volatile int dying = 0;
+static volatile int workers_may_exit = 0;
+static volatile int start_thread_may_exit = 0;
+static volatile int listener_may_exit = 0;
+static int listener_is_wakeable = 0;        /* Pollset supports APR_POLLSET_WAKEABLE */
+static int num_listensocks = 0;
+static apr_int32_t conns_this_child;        /* MaxConnectionsPerChild, only access
+                                               in listener thread */
+static apr_uint32_t connection_count = 0;   /* Number of open connections */
+static apr_uint32_t lingering_count = 0;    /* Number of connections in lingering close */
+static apr_uint32_t suspended_count = 0;    /* Number of suspended connections */
+static apr_uint32_t clogged_count = 0;      /* Number of threads processing ssl conns */
+static apr_uint32_t threads_shutdown = 0;   /* Number of threads that have shutdown
+                                               early during graceful termination */
+static int resource_shortage = 0;
+static fd_queue_t *worker_queue;
+static fd_queue_info_t *worker_queue_info;
+
+static apr_thread_mutex_t *timeout_mutex;
+
+module AP_MODULE_DECLARE_DATA mpm_event_module;
+
+/* forward declare */
+struct event_srv_cfg_s;
+typedef struct event_srv_cfg_s event_srv_cfg;
+
+static apr_pollfd_t *listener_pollfd;
+
+/*
+ * The pollset for sockets that are in any of the timeout queues. Currently
+ * we use the timeout_mutex to make sure that connections are added/removed
+ * atomically to/from both event_pollset and a timeout queue. Otherwise
+ * some confusion can happen under high load if timeout queues and pollset
+ * get out of sync.
+ * XXX: It should be possible to make the lock unnecessary in many or even all
+ * XXX: cases.
+ */
+static apr_pollset_t *event_pollset;
+
+typedef struct event_conn_state_t event_conn_state_t;
+
+/*
+ * The chain of connections to be shutdown by a worker thread (deferred),
+ * linked list updated atomically.
+ */
+static event_conn_state_t *volatile defer_linger_chain;
+
+struct event_conn_state_t {
+    /** APR_RING of expiration timeouts */
+    APR_RING_ENTRY(event_conn_state_t) timeout_list;
+    /** the time when the entry was queued */
+    apr_time_t queue_timestamp;
+    /** connection record this struct refers to */
+    conn_rec *c;
+    /** request record (if any) this struct refers to */
+    request_rec *r;
+    /** server config this struct refers to */
+    event_srv_cfg *sc;
+    /** scoreboard handle for the conn_rec */
+    ap_sb_handle_t *sbh;
+    /** is the current conn_rec suspended?  (disassociated with
+     * a particular MPM thread; for suspend_/resume_connection
+     * hooks)
+     */
+    int suspended;
+    /** memory pool to allocate from */
+    apr_pool_t *p;
+    /** bucket allocator */
+    apr_bucket_alloc_t *bucket_alloc;
+    /** poll file descriptor information */
+    apr_pollfd_t pfd;
+    /** public parts of the connection state */
+    conn_state_t pub;
+    /** chaining in defer_linger_chain */
+    struct event_conn_state_t *chain;
+};
+
+APR_RING_HEAD(timeout_head_t, event_conn_state_t);
+
+struct timeout_queue {
+    struct timeout_head_t head;
+    apr_interval_time_t timeout;
+    apr_uint32_t count;         /* for this queue */
+    apr_uint32_t *total;        /* for all chained/related queues */
+    struct timeout_queue *next; /* chaining */
+};
+/*
+ * Several timeout queues that use different timeouts, so that we always can
+ * simply append to the end.
+ *   write_completion_q uses vhost's TimeOut
+ *   keepalive_q        uses vhost's KeepAliveTimeOut
+ *   linger_q           uses MAX_SECS_TO_LINGER
+ *   short_linger_q     uses SECONDS_TO_LINGER
+ */
+static struct timeout_queue *write_completion_q,
+                            *keepalive_q,
+                            *linger_q,
+                            *short_linger_q;
+static volatile apr_time_t  queues_next_expiry;
+
+/* Prevent extra poll/wakeup calls for timeouts close in the future (queues
+ * have the granularity of a second anyway).
+ * XXX: Wouldn't 0.5s (instead of 0.1s) be "enough"?
+ */
+#define TIMEOUT_FUDGE_FACTOR apr_time_from_msec(100)
+
+/*
+ * Macros for accessing struct timeout_queue.
+ * For TO_QUEUE_APPEND and TO_QUEUE_REMOVE, timeout_mutex must be held.
+ */
+static void TO_QUEUE_APPEND(struct timeout_queue *q, event_conn_state_t *el)
+{
+    apr_time_t q_expiry;
+    apr_time_t next_expiry;
+
+    APR_RING_INSERT_TAIL(&q->head, el, event_conn_state_t, timeout_list);
+    ++*q->total;
+    ++q->count;
+
+    /* Cheaply update the overall queues' next expiry according to the
+     * first entry of this queue (oldest), if necessary.
+     */
+    el = APR_RING_FIRST(&q->head);
+    q_expiry = el->queue_timestamp + q->timeout;
+    next_expiry = queues_next_expiry;
+    if (!next_expiry || next_expiry > q_expiry + TIMEOUT_FUDGE_FACTOR) {
+        queues_next_expiry = q_expiry;
+        /* Unblock the poll()ing listener for it to update its timeout. */
+        if (listener_is_wakeable) {
+            apr_pollset_wakeup(event_pollset);
+        }
+    }
+}
+
+static void TO_QUEUE_REMOVE(struct timeout_queue *q, event_conn_state_t *el)
+{
+    APR_RING_REMOVE(el, timeout_list);
+    APR_RING_ELEM_INIT(el, timeout_list);
+    --*q->total;
+    --q->count;
+}
+
+static struct timeout_queue *TO_QUEUE_MAKE(apr_pool_t *p, apr_time_t t,
+                                           struct timeout_queue *ref)
+{
+    struct timeout_queue *q;
+                                           
+    q = apr_pcalloc(p, sizeof *q);
+    APR_RING_INIT(&q->head, event_conn_state_t, timeout_list);
+    q->total = (ref) ? ref->total : apr_pcalloc(p, sizeof *q->total);
+    q->timeout = t;
+
+    return q;
+}
+
+#define TO_QUEUE_ELEM_INIT(el) \
+    APR_RING_ELEM_INIT((el), timeout_list)
+
+/* The structure used to pass unique initialization info to each thread */
+typedef struct
+{
+    int pslot;  /* process slot */
+    int tslot;  /* worker slot of the thread */
+} proc_info;
+
+/* Structure used to pass information to the thread responsible for
+ * creating the rest of the threads.
+ */
+typedef struct
+{
+    apr_thread_t **threads;
+    apr_thread_t *listener;
+    int child_num_arg;
+    apr_threadattr_t *threadattr;
+} thread_starter;
+
+typedef enum
+{
+    PT_CSD,
+    PT_ACCEPT
+} poll_type_e;
+
+typedef struct
+{
+    poll_type_e type;
+    void *baton;
+} listener_poll_type;
+
+/* data retained by event across load/unload of the module
+ * allocated on first call to pre-config hook; located on
+ * subsequent calls to pre-config hook
+ */
+typedef struct event_retained_data {
+    ap_unixd_mpm_retained_data *mpm;
+
+    int first_server_limit;
+    int first_thread_limit;
+    int sick_child_detected;
+    int maxclients_reported;
+    int near_maxclients_reported;
+    /*
+     * The max child slot ever assigned, preserved across restarts.  Necessary
+     * to deal with MaxRequestWorkers changes across AP_SIG_GRACEFUL restarts.
+     * We use this value to optimize routines that have to scan the entire
+     * scoreboard.
+     */
+    int max_daemons_limit;
+
+    /*
+     * All running workers, active and shutting down, including those that
+     * may be left from before a graceful restart.
+     * Not kept up-to-date when shutdown is pending.
+     */
+    int total_daemons;
+
+    /*
+     * idle_spawn_rate is the number of children that will be spawned on the
+     * next maintenance cycle if there aren't enough idle servers.  It is
+     * maintained per listeners bucket, doubled up to MAX_SPAWN_RATE, and
+     * reset only when a cycle goes by without the need to spawn.
+     */
+    int *idle_spawn_rate;
+#ifndef MAX_SPAWN_RATE
+#define MAX_SPAWN_RATE        (32)
+#endif
+    int hold_off_on_exponential_spawning;
+} event_retained_data;
+static event_retained_data *retained;
+ 
+typedef struct event_child_bucket {
+    ap_pod_t *pod;
+    ap_listen_rec *listeners;
+} event_child_bucket;
+static event_child_bucket *all_buckets, /* All listeners buckets */
+                          *my_bucket;   /* Current child bucket */
+
+struct event_srv_cfg_s {
+    struct timeout_queue *wc_q,
+                         *ka_q;
+};
+
+#define ID_FROM_CHILD_THREAD(c, t)    ((c * thread_limit) + t)
+
+/* The event MPM respects a couple of runtime flags that can aid
+ * in debugging. Setting the -DNO_DETACH flag will prevent the root process
+ * from detaching from its controlling terminal. Additionally, setting
+ * the -DONE_PROCESS flag (which implies -DNO_DETACH) will get you the
+ * child_main loop running in the process which originally started up.
+ * This gives you a pretty nice debugging environment.  (You'll get a SIGHUP
+ * early in standalone_main; just continue through.  This is the server
+ * trying to kill off any child processes which it might have lying
+ * around --- Apache doesn't keep track of their pids, it just sends
+ * SIGHUP to the process group, ignoring it in the root process.
+ * Continue through and you'll be fine.).
+ */
+
+static int one_process = 0;
+
+#ifdef DEBUG_SIGSTOP
+int raise_sigstop_flags;
+#endif
+
+static apr_pool_t *pconf;       /* Pool for config stuff */
+static apr_pool_t *pchild;      /* Pool for httpd child stuff */
+static apr_pool_t *pruntime;    /* Pool for MPM threads stuff */
+
+static pid_t ap_my_pid;         /* Linux getpid() doesn't work except in main
+                                   thread. Use this instead */
+static pid_t parent_pid;
+static apr_os_thread_t *listener_os_thread;
+
+static int ap_child_slot;       /* Current child process slot in scoreboard */
+
+/* The LISTENER_SIGNAL signal will be sent from the main thread to the
+ * listener thread to wake it up for graceful termination (what a child
+ * process from an old generation does when the admin does "apachectl
+ * graceful").  This signal will be blocked in all threads of a child
+ * process except for the listener thread.
+ */
+#define LISTENER_SIGNAL     SIGHUP
+
+/* An array of socket descriptors in use by each thread used to
+ * perform a non-graceful (forced) shutdown of the server.
+ */
+static apr_socket_t **worker_sockets;
+
+static volatile apr_uint32_t listensocks_disabled;
+
+static void disable_listensocks(void)
+{
+    int i;
+    if (apr_atomic_cas32(&listensocks_disabled, 1, 0) != 0) {
+        return;
+    }
+    if (event_pollset) {
+        for (i = 0; i < num_listensocks; i++) {
+            apr_pollset_remove(event_pollset, &listener_pollfd[i]);
+        }
+    }
+    ap_scoreboard_image->parent[ap_child_slot].not_accepting = 1;
+}
+
+static void enable_listensocks(void)
+{
+    int i;
+    if (listener_may_exit
+            || apr_atomic_cas32(&listensocks_disabled, 0, 1) != 1) {
+        return;
+    }
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00457)
+                 "Accepting new connections again: "
+                 "%u active conns (%u lingering/%u clogged/%u suspended), "
+                 "%u idle workers",
+                 apr_atomic_read32(&connection_count),
+                 apr_atomic_read32(&lingering_count),
+                 apr_atomic_read32(&clogged_count),
+                 apr_atomic_read32(&suspended_count),
+                 ap_queue_info_num_idlers(worker_queue_info));
+    for (i = 0; i < num_listensocks; i++)
+        apr_pollset_add(event_pollset, &listener_pollfd[i]);
+    /*
+     * XXX: This is not yet optimal. If many workers suddenly become available,
+     * XXX: the parent may kill some processes off too soon.
+     */
+    ap_scoreboard_image->parent[ap_child_slot].not_accepting = 0;
+}
+
+static APR_INLINE apr_uint32_t listeners_disabled(void)
+{
+    return apr_atomic_read32(&listensocks_disabled);
+}
+
+static APR_INLINE int connections_above_limit(void)
+{
+    apr_uint32_t i_count = ap_queue_info_num_idlers(worker_queue_info);
+    if (i_count > 0) {
+        apr_uint32_t c_count = apr_atomic_read32(&connection_count);
+        apr_uint32_t l_count = apr_atomic_read32(&lingering_count);
+        if (c_count <= l_count
+                /* Off by 'listeners_disabled()' to avoid flip flop */
+                || c_count - l_count < (apr_uint32_t)threads_per_child +
+                                       (i_count - listeners_disabled()) *
+                                       (worker_factor / WORKER_FACTOR_SCALE)) {
+            return 0;
+        }
+    }
+    return 1;
+}
+
+static void abort_socket_nonblocking(apr_socket_t *csd)
+{
+    apr_status_t rv;
+    apr_socket_timeout_set(csd, 0);
+#if defined(SOL_SOCKET) && defined(SO_LINGER)
+    /* This socket is over now, and we don't want to block nor linger
+     * anymore, so reset it. A normal close could still linger in the
+     * system, while RST is fast, nonblocking, and what the peer will
+     * get if it sends us further data anyway.
+     */
+    {
+        apr_os_sock_t osd = -1;
+        struct linger opt;
+        opt.l_onoff = 1;
+        opt.l_linger = 0; /* zero timeout is RST */
+        apr_os_sock_get(&osd, csd);
+        setsockopt(osd, SOL_SOCKET, SO_LINGER, (void *)&opt, sizeof opt);
+    }
+#endif
+    rv = apr_socket_close(csd);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00468)
+                     "error closing socket");
+        AP_DEBUG_ASSERT(0);
+    }
+}
+
+static void close_worker_sockets(void)
+{
+    int i;
+    for (i = 0; i < threads_per_child; i++) {
+        apr_socket_t *csd = worker_sockets[i];
+        if (csd) {
+            worker_sockets[i] = NULL;
+            abort_socket_nonblocking(csd);
+        }
+    }
+    for (;;) {
+        event_conn_state_t *cs = defer_linger_chain;
+        if (!cs) {
+            break;
+        }
+        if (apr_atomic_casptr((void *)&defer_linger_chain, cs->chain,
+                              cs) != cs) {
+            /* Race lost, try again */
+            continue;
+        }
+        cs->chain = NULL;
+        abort_socket_nonblocking(cs->pfd.desc.s);
+    }
+}
+
+static void wakeup_listener(void)
+{
+    listener_may_exit = 1;
+    disable_listensocks();
+
+    /* Unblock the listener if it's poll()ing */
+    if (event_pollset && listener_is_wakeable) {
+        apr_pollset_wakeup(event_pollset);
+    }
+
+    /* unblock the listener if it's waiting for a worker */
+    if (worker_queue_info) {
+        ap_queue_info_term(worker_queue_info);
+    }
+
+    if (!listener_os_thread) {
+        /* XXX there is an obscure path that this doesn't handle perfectly:
+         *     right after listener thread is created but before
+         *     listener_os_thread is set, the first worker thread hits an
+         *     error and starts graceful termination
+         */
+        return;
+    }
+    /*
+     * we should just be able to "kill(ap_my_pid, LISTENER_SIGNAL)" on all
+     * platforms and wake up the listener thread since it is the only thread
+     * with SIGHUP unblocked, but that doesn't work on Linux
+     */
+#ifdef HAVE_PTHREAD_KILL
+    pthread_kill(*listener_os_thread, LISTENER_SIGNAL);
+#else
+    kill(ap_my_pid, LISTENER_SIGNAL);
+#endif
+}
+
+#define ST_INIT              0
+#define ST_GRACEFUL          1
+#define ST_UNGRACEFUL        2
+
+static int terminate_mode = ST_INIT;
+
+static void signal_threads(int mode)
+{
+    if (terminate_mode >= mode) {
+        return;
+    }
+    terminate_mode = mode;
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+
+    /* in case we weren't called from the listener thread, wake up the
+     * listener thread
+     */
+    wakeup_listener();
+
+    /* for ungraceful termination, let the workers exit now;
+     * for graceful termination, the listener thread will notify the
+     * workers to exit once it has stopped accepting new connections
+     */
+    if (mode == ST_UNGRACEFUL) {
+        workers_may_exit = 1;
+        ap_queue_interrupt_all(worker_queue);
+        close_worker_sockets(); /* forcefully kill all current connections */
+    }
+}
+
+static int event_query(int query_code, int *result, apr_status_t *rv)
+{
+    *rv = APR_SUCCESS;
+    switch (query_code) {
+    case AP_MPMQ_MAX_DAEMON_USED:
+        *result = retained->max_daemons_limit;
+        break;
+    case AP_MPMQ_IS_THREADED:
+        *result = AP_MPMQ_STATIC;
+        break;
+    case AP_MPMQ_IS_FORKED:
+        *result = AP_MPMQ_DYNAMIC;
+        break;
+    case AP_MPMQ_IS_ASYNC:
+        *result = 1;
+        break;
+    case AP_MPMQ_HARD_LIMIT_DAEMONS:
+        *result = server_limit;
+        break;
+    case AP_MPMQ_HARD_LIMIT_THREADS:
+        *result = thread_limit;
+        break;
+    case AP_MPMQ_MAX_THREADS:
+        *result = threads_per_child;
+        break;
+    case AP_MPMQ_MIN_SPARE_DAEMONS:
+        *result = 0;
+        break;
+    case AP_MPMQ_MIN_SPARE_THREADS:
+        *result = min_spare_threads;
+        break;
+    case AP_MPMQ_MAX_SPARE_DAEMONS:
+        *result = 0;
+        break;
+    case AP_MPMQ_MAX_SPARE_THREADS:
+        *result = max_spare_threads;
+        break;
+    case AP_MPMQ_MAX_REQUESTS_DAEMON:
+        *result = ap_max_requests_per_child;
+        break;
+    case AP_MPMQ_MAX_DAEMONS:
+        *result = active_daemons_limit;
+        break;
+    case AP_MPMQ_MPM_STATE:
+        *result = retained->mpm->mpm_state;
+        break;
+    case AP_MPMQ_GENERATION:
+        *result = retained->mpm->my_generation;
+        break;
+    default:
+        *rv = APR_ENOTIMPL;
+        break;
+    }
+    return OK;
+}
+
+static void event_note_child_killed(int childnum, pid_t pid, ap_generation_t gen)
+{
+    if (childnum != -1) { /* child had a scoreboard slot? */
+        ap_run_child_status(ap_server_conf,
+                            ap_scoreboard_image->parent[childnum].pid,
+                            ap_scoreboard_image->parent[childnum].generation,
+                            childnum, MPM_CHILD_EXITED);
+        ap_scoreboard_image->parent[childnum].pid = 0;
+    }
+    else {
+        ap_run_child_status(ap_server_conf, pid, gen, -1, MPM_CHILD_EXITED);
+    }
+}
+
+static void event_note_child_started(int slot, pid_t pid)
+{
+    ap_generation_t gen = retained->mpm->my_generation;
+    ap_scoreboard_image->parent[slot].pid = pid;
+    ap_scoreboard_image->parent[slot].generation = gen;
+    ap_run_child_status(ap_server_conf, pid, gen, slot, MPM_CHILD_STARTED);
+}
+
+static const char *event_get_name(void)
+{
+    return "event";
+}
+
+/* a clean exit from a child with proper cleanup */
+static void clean_child_exit(int code) __attribute__ ((noreturn));
+static void clean_child_exit(int code)
+{
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+    if (pchild) {
+        apr_pool_destroy(pchild);
+    }
+
+    if (one_process) {
+        event_note_child_killed(/* slot */ 0, 0, 0);
+    }
+
+    exit(code);
+}
+
+static void just_die(int sig)
+{
+    clean_child_exit(0);
+}
+
+/*****************************************************************
+ * Connection structures and accounting...
+ */
+
+static int child_fatal;
+
+static apr_status_t decrement_connection_count(void *cs_)
+{
+    int is_last_connection;
+    event_conn_state_t *cs = cs_;
+    switch (cs->pub.state) {
+        case CONN_STATE_LINGER_NORMAL:
+        case CONN_STATE_LINGER_SHORT:
+            apr_atomic_dec32(&lingering_count);
+            break;
+        case CONN_STATE_SUSPENDED:
+            apr_atomic_dec32(&suspended_count);
+            break;
+        default:
+            break;
+    }
+    /* Unblock the listener if it's waiting for connection_count = 0,
+     * or if the listening sockets were disabled due to limits and can
+     * now accept new connections.
+     */
+    is_last_connection = !apr_atomic_dec32(&connection_count);
+    if (listener_is_wakeable
+            && ((is_last_connection && listener_may_exit)
+                || (listeners_disabled() && !connections_above_limit()))) {
+        apr_pollset_wakeup(event_pollset);
+    }
+    return APR_SUCCESS;
+}
+
+static void notify_suspend(event_conn_state_t *cs)
+{
+    ap_run_suspend_connection(cs->c, cs->r);
+    cs->c->sbh = NULL;
+    cs->suspended = 1;
+}
+
+static void notify_resume(event_conn_state_t *cs, int cleanup)
+{
+    cs->suspended = 0;
+    cs->c->sbh = cleanup ? NULL : cs->sbh;
+    ap_run_resume_connection(cs->c, cs->r);
+}
+
+/*
+ * Close our side of the connection, flushing data to the client first.
+ * Pre-condition: cs is not in any timeout queue and not in the pollset,
+ *                timeout_mutex is not locked
+ * return: 0 if connection is fully closed,
+ *         1 if connection is lingering
+ * May only be called by worker thread.
+ */
+static int start_lingering_close_blocking(event_conn_state_t *cs)
+{
+    apr_socket_t *csd = cs->pfd.desc.s;
+
+    if (ap_start_lingering_close(cs->c)) {
+        notify_suspend(cs);
+        apr_socket_close(csd);
+        ap_queue_info_push_pool(worker_queue_info, cs->p);
+        return DONE;
+    }
+
+#ifdef AP_DEBUG
+    {
+        apr_status_t rv;
+        rv = apr_socket_timeout_set(csd, 0);
+        AP_DEBUG_ASSERT(rv == APR_SUCCESS);
+    }
+#else
+    apr_socket_timeout_set(csd, 0);
+#endif
+
+    cs->queue_timestamp = apr_time_now();
+    /*
+     * If some module requested a shortened waiting period, only wait for
+     * 2s (SECONDS_TO_LINGER). This is useful for mitigating certain
+     * DoS attacks.
+     */
+    if (apr_table_get(cs->c->notes, "short-lingering-close")) {
+        cs->pub.state = CONN_STATE_LINGER_SHORT;
+    }
+    else {
+        cs->pub.state = CONN_STATE_LINGER_NORMAL;
+    }
+    apr_atomic_inc32(&lingering_count);
+    notify_suspend(cs);
+
+    return OK;
+}
+
+/*
+ * Defer flush and close of the connection by adding it to defer_linger_chain,
+ * for a worker to grab it and do the job (should that be blocking).
+ * Pre-condition: cs is not in any timeout queue and not in the pollset,
+ *                timeout_mutex is not locked
+ * return: 1 connection is alive (but aside and about to linger)
+ * May be called by listener thread.
+ */
+static int start_lingering_close_nonblocking(event_conn_state_t *cs)
+{
+    event_conn_state_t *chain;
+    for (;;) {
+        cs->chain = chain = defer_linger_chain;
+        if (apr_atomic_casptr((void *)&defer_linger_chain, cs,
+                              chain) != chain) {
+            /* Race lost, try again */
+            continue;
+        }
+        return 1;
+    }
+}
+
+/*
+ * forcibly close a lingering connection after the lingering period has
+ * expired
+ * Pre-condition: cs is not in any timeout queue and not in the pollset
+ * return: irrelevant (need same prototype as start_lingering_close)
+ */
+static int stop_lingering_close(event_conn_state_t *cs)
+{
+    apr_socket_t *csd = ap_get_conn_socket(cs->c);
+    ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, ap_server_conf,
+                 "socket abort in state %i", (int)cs->pub.state);
+    abort_socket_nonblocking(csd);
+    ap_queue_info_push_pool(worker_queue_info, cs->p);
+    if (dying)
+        ap_queue_interrupt_one(worker_queue);
+    return 0;
+}
+
+/*
+ * This runs before any non-MPM cleanup code on the connection;
+ * if the connection is currently suspended as far as modules
+ * know, provide notification of resumption.
+ */
+static apr_status_t ptrans_pre_cleanup(void *dummy)
+{
+    event_conn_state_t *cs = dummy;
+
+    if (cs->suspended) {
+        notify_resume(cs, 1);
+    }
+    return APR_SUCCESS;
+}
+
+/*
+ * event_pre_read_request() and event_request_cleanup() track the
+ * current r for a given connection.
+ */
+static apr_status_t event_request_cleanup(void *dummy)
+{
+    conn_rec *c = dummy;
+    event_conn_state_t *cs = ap_get_module_config(c->conn_config,
+                                                  &mpm_event_module);
+
+    cs->r = NULL;
+    return APR_SUCCESS;
+}
+
+static void event_pre_read_request(request_rec *r, conn_rec *c)
+{
+    event_conn_state_t *cs = ap_get_module_config(c->conn_config,
+                                                  &mpm_event_module);
+
+    cs->r = r;
+    cs->sc = ap_get_module_config(ap_server_conf->module_config,
+                                  &mpm_event_module);
+    apr_pool_cleanup_register(r->pool, c, event_request_cleanup,
+                              apr_pool_cleanup_null);
+}
+
+/*
+ * event_post_read_request() tracks the current server config for a
+ * given request.
+ */
+static int event_post_read_request(request_rec *r)
+{
+    conn_rec *c = r->connection;
+    event_conn_state_t *cs = ap_get_module_config(c->conn_config,
+                                                  &mpm_event_module);
+
+    /* To preserve legacy behaviour (consistent with other MPMs), use
+     * the keepalive timeout from the base server (first on this IP:port)
+     * when none is explicitly configured on this server.
+     */
+    if (r->server->keep_alive_timeout_set) {
+        cs->sc = ap_get_module_config(r->server->module_config,
+                                      &mpm_event_module);
+    }
+    else {
+        cs->sc = ap_get_module_config(c->base_server->module_config,
+                                      &mpm_event_module);
+    }
+    return OK;
+}
+
+/* Forward declare */
+static void process_lingering_close(event_conn_state_t *cs);
+
+/*
+ * process one connection in the worker
+ */
+static void process_socket(apr_thread_t *thd, apr_pool_t * p, apr_socket_t * sock,
+                          event_conn_state_t * cs, int my_child_num,
+                          int my_thread_num)
+{
+    conn_rec *c;
+    long conn_id = ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);
+    int clogging = 0;
+    apr_status_t rv;
+    int rc = OK;
+
+    if (cs == NULL) {           /* This is a new connection */
+        listener_poll_type *pt = apr_pcalloc(p, sizeof(*pt));
+        cs = apr_pcalloc(p, sizeof(event_conn_state_t));
+        cs->bucket_alloc = apr_bucket_alloc_create(p);
+        ap_create_sb_handle(&cs->sbh, p, my_child_num, my_thread_num);
+        c = ap_run_create_connection(p, ap_server_conf, sock,
+                                     conn_id, cs->sbh, cs->bucket_alloc);
+        if (!c) {
+            ap_queue_info_push_pool(worker_queue_info, p);
+            return;
+        }
+        apr_atomic_inc32(&connection_count);
+        apr_pool_cleanup_register(c->pool, cs, decrement_connection_count,
+                                  apr_pool_cleanup_null);
+        ap_set_module_config(c->conn_config, &mpm_event_module, cs);
+        c->current_thread = thd;
+        cs->c = c;
+        c->cs = &(cs->pub);
+        cs->p = p;
+        cs->sc = ap_get_module_config(ap_server_conf->module_config,
+                                      &mpm_event_module);
+        cs->pfd.desc_type = APR_POLL_SOCKET;
+        cs->pfd.reqevents = APR_POLLIN;
+        cs->pfd.desc.s = sock;
+        pt->type = PT_CSD;
+        pt->baton = cs;
+        cs->pfd.client_data = pt;
+        apr_pool_pre_cleanup_register(p, cs, ptrans_pre_cleanup);
+        TO_QUEUE_ELEM_INIT(cs);
+
+        ap_update_vhost_given_ip(c);
+
+        rc = ap_run_pre_connection(c, sock);
+        if (rc != OK && rc != DONE) {
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(00469)
+                          "process_socket: connection aborted");
+            c->aborted = 1;
+        }
+
+        /**
+         * XXX If the platform does not have a usable way of bundling
+         * accept() with a socket readability check, like Win32,
+         * and there are measurable delays before the
+         * socket is readable due to the first data packet arriving,
+         * it might be better to create the cs on the listener thread
+         * with the state set to CONN_STATE_CHECK_REQUEST_LINE_READABLE
+         *
+         * FreeBSD users will want to enable the HTTP accept filter
+         * module in their kernel for the highest performance
+         * When the accept filter is active, sockets are kept in the
+         * kernel until a HTTP request is received.
+         */
+        cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
+
+        cs->pub.sense = CONN_SENSE_DEFAULT;
+        rc = OK;
+    }
+    else {
+        c = cs->c;
+        ap_update_sb_handle(cs->sbh, my_child_num, my_thread_num);
+        notify_resume(cs, 0);
+        c->current_thread = thd;
+        /* Subsequent request on a conn, and thread number is part of ID */
+        c->id = conn_id;
+    }
+
+    if (c->aborted) {
+        /* do lingering close below */
+        cs->pub.state = CONN_STATE_LINGER;
+    }
+    else if (cs->pub.state >= CONN_STATE_LINGER) {
+        /* fall through */
+    }
+    else {
+        if (cs->pub.state == CONN_STATE_READ_REQUEST_LINE
+            /* If we have an input filter which 'clogs' the input stream,
+             * like mod_ssl used to, lets just do the normal read from input
+             * filters, like the Worker MPM does. Filters that need to write
+             * where they would otherwise read, or read where they would
+             * otherwise write, should set the sense appropriately.
+             */
+             || c->clogging_input_filters) {
+read_request:
+            clogging = c->clogging_input_filters;
+            if (clogging) {
+                apr_atomic_inc32(&clogged_count);
+            }
+            rc = ap_run_process_connection(c);
+            if (clogging) {
+                apr_atomic_dec32(&clogged_count);
+            }
+            if (cs->pub.state > CONN_STATE_LINGER) {
+                cs->pub.state = CONN_STATE_LINGER;
+            }
+            if (rc == DONE) {
+                rc = OK;
+            }
+        }
+    }
+    /*
+     * The process_connection hooks above should set the connection state
+     * appropriately upon return, for event MPM to either:
+     * - do lingering close (CONN_STATE_LINGER),
+     * - wait for readability of the next request with respect to the keepalive
+     *   timeout (state CONN_STATE_CHECK_REQUEST_LINE_READABLE),
+     * - wait for read/write-ability of the underlying socket with respect to
+     *   its timeout by setting c->clogging_input_filters to 1 and the sense
+     *   to CONN_SENSE_WANT_READ/WRITE (state CONN_STATE_WRITE_COMPLETION),
+     * - keep flushing the output filters stack in nonblocking mode, and then
+     *   if required wait for read/write-ability of the underlying socket with
+     *   respect to its own timeout (state CONN_STATE_WRITE_COMPLETION); since
+     *   completion at some point may require reads (e.g. SSL_ERROR_WANT_READ),
+     *   an output filter can also set the sense to CONN_SENSE_WANT_READ at any
+     *   time for event MPM to do the right thing,
+     * - suspend the connection (SUSPENDED) such that it now interracts with
+     *   the MPM through suspend/resume_connection() hooks, and/or registered
+     *   poll callbacks (PT_USER), and/or registered timed callbacks triggered
+     *   by timer events.
+     * If a process_connection hook returns an error or no hook sets the state
+     * to one of the above expected value, we forcibly close the connection w/
+     * CONN_STATE_LINGER.  This covers the cases where no process_connection
+     * hook executes (DECLINED), or one returns OK w/o touching the state (i.e.
+     * CONN_STATE_READ_REQUEST_LINE remains after the call) which can happen
+     * with third-party modules not updated to work specifically with event MPM
+     * while this was expected to do lingering close unconditionally with
+     * worker or prefork MPMs for instance.
+     */
+    if (rc != OK || (cs->pub.state >= CONN_STATE_NUM)
+                 || (cs->pub.state < CONN_STATE_LINGER
+                     && cs->pub.state != CONN_STATE_WRITE_COMPLETION
+                     && cs->pub.state != CONN_STATE_CHECK_REQUEST_LINE_READABLE
+                     && cs->pub.state != CONN_STATE_SUSPENDED)) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(10111)
+                      "process_socket: connection processing %s: closing",
+                      rc ? apr_psprintf(c->pool, "returned error %i", rc)
+                         : apr_psprintf(c->pool, "unexpected state %i",
+                                                 (int)cs->pub.state));
+        cs->pub.state = CONN_STATE_LINGER;
+    }
+
+    if (cs->pub.state == CONN_STATE_WRITE_COMPLETION) {
+        ap_filter_t *output_filter = c->output_filters;
+        apr_status_t rv;
+        ap_update_child_status(cs->sbh, SERVER_BUSY_WRITE, NULL);
+        while (output_filter->next != NULL) {
+            output_filter = output_filter->next;
+        }
+        rv = output_filter->frec->filter_func.out_func(output_filter, NULL);
+        if (rv != APR_SUCCESS) {
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, rv, c, APLOGNO(00470)
+                          "network write failure in core output filter");
+            cs->pub.state = CONN_STATE_LINGER;
+        }
+        else if (c->data_in_output_filters) {
+            /* Still in WRITE_COMPLETION_STATE:
+             * Set a write timeout for this connection, and let the
+             * event thread poll for writeability.
+             */
+            cs->queue_timestamp = apr_time_now();
+            notify_suspend(cs);
+
+            if (cs->pub.sense == CONN_SENSE_WANT_READ) {
+                cs->pfd.reqevents = APR_POLLIN;
+            }
+            else {
+                cs->pfd.reqevents = APR_POLLOUT;
+            }
+            /* POLLHUP/ERR are usually returned event only (ignored here), but
+             * some pollset backends may require them in reqevents to do the
+             * right thing, so it shouldn't hurt.
+             */
+            cs->pfd.reqevents |= APR_POLLHUP | APR_POLLERR;
+            cs->pub.sense = CONN_SENSE_DEFAULT;
+
+            apr_thread_mutex_lock(timeout_mutex);
+            TO_QUEUE_APPEND(cs->sc->wc_q, cs);
+            rv = apr_pollset_add(event_pollset, &cs->pfd);
+            if (rv != APR_SUCCESS && !APR_STATUS_IS_EEXIST(rv)) {
+                AP_DEBUG_ASSERT(0);
+                TO_QUEUE_REMOVE(cs->sc->wc_q, cs);
+                apr_thread_mutex_unlock(timeout_mutex);
+                ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(03465)
+                             "process_socket: apr_pollset_add failure for "
+                             "write completion");
+                apr_socket_close(cs->pfd.desc.s);
+                ap_queue_info_push_pool(worker_queue_info, cs->p);
+            }
+            else {
+                apr_thread_mutex_unlock(timeout_mutex);
+            }
+            return;
+        }
+        else if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted ||
+                 listener_may_exit) {
+            cs->pub.state = CONN_STATE_LINGER;
+        }
+        else if (c->data_in_input_filters) {
+            cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
+            goto read_request;
+        }
+        else {
+            cs->pub.state = CONN_STATE_CHECK_REQUEST_LINE_READABLE;
+        }
+    }
+
+    if (cs->pub.state == CONN_STATE_CHECK_REQUEST_LINE_READABLE) {
+        ap_update_child_status(cs->sbh, SERVER_BUSY_KEEPALIVE, NULL);
+
+        /* It greatly simplifies the logic to use a single timeout value per q
+         * because the new element can just be added to the end of the list and
+         * it will stay sorted in expiration time sequence.  If brand new
+         * sockets are sent to the event thread for a readability check, this
+         * will be a slight behavior change - they use the non-keepalive
+         * timeout today.  With a normal client, the socket will be readable in
+         * a few milliseconds anyway.
+         */
+        cs->queue_timestamp = apr_time_now();
+        notify_suspend(cs);
+
+        /* Add work to pollset. */
+        cs->pfd.reqevents = APR_POLLIN;
+        apr_thread_mutex_lock(timeout_mutex);
+        TO_QUEUE_APPEND(cs->sc->ka_q, cs);
+        rv = apr_pollset_add(event_pollset, &cs->pfd);
+        if (rv != APR_SUCCESS && !APR_STATUS_IS_EEXIST(rv)) {
+            AP_DEBUG_ASSERT(0);
+            TO_QUEUE_REMOVE(cs->sc->ka_q, cs);
+            apr_thread_mutex_unlock(timeout_mutex);
+            ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(03093)
+                         "process_socket: apr_pollset_add failure for "
+                         "keep alive");
+            apr_socket_close(cs->pfd.desc.s);
+            ap_queue_info_push_pool(worker_queue_info, cs->p);
+        }
+        else {
+            apr_thread_mutex_unlock(timeout_mutex);
+        }
+        return;
+    }
+
+    if (cs->pub.state == CONN_STATE_SUSPENDED) {
+        apr_atomic_inc32(&suspended_count);
+        notify_suspend(cs);
+        return;
+    }
+
+    if (cs->pub.state == CONN_STATE_LINGER) {
+        rc = start_lingering_close_blocking(cs);
+    }
+    if (rc == OK && (cs->pub.state == CONN_STATE_LINGER_NORMAL ||
+                     cs->pub.state == CONN_STATE_LINGER_SHORT)) {
+        process_lingering_close(cs);
+    }
+}
+
+/* conns_this_child has gone to zero or below.  See if the admin coded
+   "MaxConnectionsPerChild 0", and keep going in that case.  Doing it this way
+   simplifies the hot path in worker_thread */
+static void check_infinite_requests(void)
+{
+    if (ap_max_requests_per_child) {
+        ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, ap_server_conf,
+                     "Stopping process due to MaxConnectionsPerChild");
+        signal_threads(ST_GRACEFUL);
+    }
+    else {
+        /* keep going */
+        conns_this_child = APR_INT32_MAX;
+    }
+}
+
+static void close_listeners(int *closed)
+{
+    if (!*closed) {
+        int i;
+        ap_close_listeners_ex(my_bucket->listeners);
+        *closed = 1;
+        dying = 1;
+        ap_scoreboard_image->parent[ap_child_slot].quiescing = 1;
+        for (i = 0; i < threads_per_child; ++i) {
+            ap_update_child_status_from_indexes(ap_child_slot, i,
+                                                SERVER_GRACEFUL, NULL);
+        }
+        /* wake up the main thread */
+        kill(ap_my_pid, SIGTERM);
+
+        ap_queue_info_free_idle_pools(worker_queue_info);
+        ap_queue_interrupt_all(worker_queue);
+    }
+}
+
+static void unblock_signal(int sig)
+{
+    sigset_t sig_mask;
+
+    sigemptyset(&sig_mask);
+    sigaddset(&sig_mask, sig);
+#if defined(SIGPROCMASK_SETS_THREAD_MASK)
+    sigprocmask(SIG_UNBLOCK, &sig_mask, NULL);
+#else
+    pthread_sigmask(SIG_UNBLOCK, &sig_mask, NULL);
+#endif
+}
+
+static void dummy_signal_handler(int sig)
+{
+    /* XXX If specifying SIG_IGN is guaranteed to unblock a syscall,
+     *     then we don't need this goofy function.
+     */
+}
+
+
+static apr_status_t push_timer2worker(timer_event_t* te)
+{
+    return ap_queue_push_timer(worker_queue, te);
+}
+
+/*
+ * Pre-condition: cs is neither in event_pollset nor a timeout queue
+ * this function may only be called by the listener
+ */
+static apr_status_t push2worker(event_conn_state_t *cs, apr_socket_t *csd,
+                                apr_pool_t *ptrans)
+{
+    apr_status_t rc;
+
+    if (cs) {
+        csd = cs->pfd.desc.s;
+        ptrans = cs->p;
+    }
+    rc = ap_queue_push_socket(worker_queue, csd, cs, ptrans);
+    if (rc != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rc, ap_server_conf, APLOGNO(00471)
+                     "push2worker: ap_queue_push_socket failed");
+        /* trash the connection; we couldn't queue the connected
+         * socket to a worker
+         */
+        if (csd) {
+            abort_socket_nonblocking(csd);
+        }
+        if (ptrans) {
+            ap_queue_info_push_pool(worker_queue_info, ptrans);
+        }
+        signal_threads(ST_GRACEFUL);
+    }
+
+    return rc;
+}
+
+/* get_worker:
+ *     If *have_idle_worker_p == 0, reserve a worker thread, and set
+ *     *have_idle_worker_p = 1.
+ *     If *have_idle_worker_p is already 1, will do nothing.
+ *     If blocking == 1, block if all workers are currently busy.
+ *     If no worker was available immediately, will set *all_busy to 1.
+ *     XXX: If there are no workers, we should not block immediately but
+ *     XXX: close all keep-alive connections first.
+ */
+static void get_worker(int *have_idle_worker_p, int blocking, int *all_busy)
+{
+    apr_status_t rc;
+
+    if (*have_idle_worker_p) {
+        /* already reserved a worker thread - must have hit a
+         * transient error on a previous pass
+         */
+        return;
+    }
+
+    if (blocking)
+        rc = ap_queue_info_wait_for_idler(worker_queue_info, all_busy);
+    else
+        rc = ap_queue_info_try_get_idler(worker_queue_info);
+
+    if (rc == APR_SUCCESS || APR_STATUS_IS_EOF(rc)) {
+        *have_idle_worker_p = 1;
+    }
+    else if (!blocking && rc == APR_EAGAIN) {
+        *all_busy = 1;
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf, APLOGNO(00472)
+                     "ap_queue_info_wait_for_idler failed.  "
+                     "Attempting to shutdown process gracefully");
+        signal_threads(ST_GRACEFUL);
+    }
+}
+
+/* Structures to reuse */
+static APR_RING_HEAD(timer_free_ring_t, timer_event_t) timer_free_ring;
+
+static apr_skiplist *timer_skiplist;
+static volatile apr_time_t timers_next_expiry;
+
+/* Same goal as for TIMEOUT_FUDGE_FACTOR (avoid extra poll calls), but applied
+ * to timers. Since their timeouts are custom (user defined), we can't be too
+ * approximative here (hence using 0.01s).
+ */
+#define EVENT_FUDGE_FACTOR apr_time_from_msec(10)
+
+/* The following compare function is used by apr_skiplist_insert() to keep the
+ * elements (timers) sorted and provide O(log n) complexity (this is also true
+ * for apr_skiplist_{find,remove}(), but those are not used in MPM event where
+ * inserted timers are not searched nor removed, but with apr_skiplist_pop()
+ * which does use any compare function).  It is meant to return 0 when a == b,
+ * <0 when a < b, and >0 when a > b.  However apr_skiplist_insert() will not
+ * add duplicates (i.e. a == b), and apr_skiplist_add() is only available in
+ * APR 1.6, yet multiple timers could possibly be created in the same micro-
+ * second (duplicates with regard to apr_time_t); therefore we implement the
+ * compare function to return +1 instead of 0 when compared timers are equal,
+ * thus duplicates are still added after each other (in order of insertion).
+ */
+static int timer_comp(void *a, void *b)
+{
+    apr_time_t t1 = (apr_time_t) ((timer_event_t *)a)->when;
+    apr_time_t t2 = (apr_time_t) ((timer_event_t *)b)->when;
+    AP_DEBUG_ASSERT(t1);
+    AP_DEBUG_ASSERT(t2);
+    return ((t1 < t2) ? -1 : 1);
+}
+
+static apr_thread_mutex_t *g_timer_skiplist_mtx;
+
+static apr_status_t event_register_timed_callback(apr_time_t t,
+                                                  ap_mpm_callback_fn_t *cbfn,
+                                                  void *baton)
+{
+    timer_event_t *te;
+    /* oh yeah, and make locking smarter/fine grained. */
+    apr_thread_mutex_lock(g_timer_skiplist_mtx);
+
+    if (!APR_RING_EMPTY(&timer_free_ring, timer_event_t, link)) {
+        te = APR_RING_FIRST(&timer_free_ring);
+        APR_RING_REMOVE(te, link);
+    }
+    else {
+        te = apr_skiplist_alloc(timer_skiplist, sizeof(timer_event_t));
+        APR_RING_ELEM_INIT(te, link);
+    }
+
+    te->cbfunc = cbfn;
+    te->baton = baton;
+    /* XXXXX: optimize */
+    te->when = t + apr_time_now();
+
+    { 
+        apr_time_t next_expiry;
+
+        /* Okay, add sorted by when.. */
+        apr_skiplist_insert(timer_skiplist, te);
+
+        /* Cheaply update the overall timers' next expiry according to
+         * this event, if necessary.
+         */
+        next_expiry = timers_next_expiry;
+        if (!next_expiry || next_expiry > te->when + EVENT_FUDGE_FACTOR) {
+            timers_next_expiry = te->when;
+            /* Unblock the poll()ing listener for it to update its timeout. */
+            if (listener_is_wakeable) {
+                apr_pollset_wakeup(event_pollset);
+            }
+        }
+    }
+
+    apr_thread_mutex_unlock(g_timer_skiplist_mtx);
+
+    return APR_SUCCESS;
+}
+
+
+/*
+ * Close socket and clean up if remote closed its end while we were in
+ * lingering close. Only to be called in the worker thread, and since it's
+ * in immediate call stack, we can afford a comfortable buffer size to
+ * consume data quickly.
+ */
+#define LINGERING_BUF_SIZE (32 * 1024)
+static void process_lingering_close(event_conn_state_t *cs)
+{
+    apr_socket_t *csd = ap_get_conn_socket(cs->c);
+    char dummybuf[LINGERING_BUF_SIZE];
+    apr_size_t nbytes;
+    apr_status_t rv;
+    struct timeout_queue *q;
+
+    /* socket is already in non-blocking state */
+    do {
+        nbytes = sizeof(dummybuf);
+        rv = apr_socket_recv(csd, dummybuf, &nbytes);
+    } while (rv == APR_SUCCESS);
+
+    if (!APR_STATUS_IS_EAGAIN(rv)) {
+        rv = apr_socket_close(csd);
+        AP_DEBUG_ASSERT(rv == APR_SUCCESS);
+        ap_queue_info_push_pool(worker_queue_info, cs->p);
+        return;
+    }
+
+    /* Re-queue the connection to come back when readable */
+    cs->pfd.reqevents = APR_POLLIN;
+    cs->pub.sense = CONN_SENSE_DEFAULT;
+    q = (cs->pub.state == CONN_STATE_LINGER_SHORT) ? short_linger_q : linger_q;
+    apr_thread_mutex_lock(timeout_mutex);
+    TO_QUEUE_APPEND(q, cs);
+    rv = apr_pollset_add(event_pollset, &cs->pfd);
+    if (rv != APR_SUCCESS && !APR_STATUS_IS_EEXIST(rv)) {
+        AP_DEBUG_ASSERT(0);
+        TO_QUEUE_REMOVE(q, cs);
+        apr_thread_mutex_unlock(timeout_mutex);
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(03092)
+                     "process_lingering_close: apr_pollset_add failure");
+        rv = apr_socket_close(cs->pfd.desc.s);
+        AP_DEBUG_ASSERT(rv == APR_SUCCESS);
+        ap_queue_info_push_pool(worker_queue_info, cs->p);
+        return;
+    }
+    apr_thread_mutex_unlock(timeout_mutex);
+}
+
+/* call 'func' for all elements of 'q' with timeout less than 'timeout_time'.
+ * Pre-condition: timeout_mutex must already be locked
+ * Post-condition: timeout_mutex will be locked again
+ */
+static void process_timeout_queue(struct timeout_queue *q,
+                                  apr_time_t timeout_time,
+                                  int (*func)(event_conn_state_t *))
+{
+    apr_uint32_t total = 0, count;
+    event_conn_state_t *first, *cs, *last;
+    struct timeout_head_t trash;
+    struct timeout_queue *qp;
+    apr_status_t rv;
+
+    if (!*q->total) {
+        return;
+    }
+
+    APR_RING_INIT(&trash, event_conn_state_t, timeout_list);
+    for (qp = q; qp; qp = qp->next) {
+        count = 0;
+        cs = first = last = APR_RING_FIRST(&qp->head);
+        while (cs != APR_RING_SENTINEL(&qp->head, event_conn_state_t,
+                                       timeout_list)) {
+            /* Trash the entry if:
+             * - no timeout_time was given (asked for all), or
+             * - it expired (according to the queue timeout), or
+             * - the system clock skewed in the past: no entry should be
+             *   registered above the given timeout_time (~now) + the queue
+             *   timeout, we won't keep any here (eg. for centuries).
+             *
+             * Otherwise stop, no following entry will match thanks to the
+             * single timeout per queue (entries are added to the end!).
+             * This allows maintenance in O(1).
+             */
+            if (timeout_time
+                    && cs->queue_timestamp + qp->timeout > timeout_time
+                    && cs->queue_timestamp < timeout_time + qp->timeout) {
+                /* Since this is the next expiring of this queue, update the
+                 * overall queues' next expiry if it's later than this one.
+                 */
+                apr_time_t q_expiry = cs->queue_timestamp + qp->timeout;
+                apr_time_t next_expiry = queues_next_expiry;
+                if (!next_expiry || next_expiry > q_expiry) {
+                    queues_next_expiry = q_expiry;
+                }
+                break;
+            }
+
+            last = cs;
+            rv = apr_pollset_remove(event_pollset, &cs->pfd);
+            if (rv != APR_SUCCESS && !APR_STATUS_IS_NOTFOUND(rv)) {
+                AP_DEBUG_ASSERT(0);
+                ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, cs->c, APLOGNO(00473)
+                              "apr_pollset_remove failed");
+            }
+            cs = APR_RING_NEXT(cs, timeout_list);
+            count++;
+        }
+        if (!count)
+            continue;
+
+        APR_RING_UNSPLICE(first, last, timeout_list);
+        APR_RING_SPLICE_TAIL(&trash, first, last, event_conn_state_t,
+                             timeout_list);
+        AP_DEBUG_ASSERT(*q->total >= count && qp->count >= count);
+        *q->total -= count;
+        qp->count -= count;
+        total += count;
+    }
+    if (!total)
+        return;
+
+    apr_thread_mutex_unlock(timeout_mutex);
+    first = APR_RING_FIRST(&trash);
+    do {
+        cs = APR_RING_NEXT(first, timeout_list);
+        TO_QUEUE_ELEM_INIT(first);
+        func(first);
+        first = cs;
+    } while (--total);
+    apr_thread_mutex_lock(timeout_mutex);
+}
+
+static void process_keepalive_queue(apr_time_t timeout_time)
+{
+    /* If all workers are busy, we kill older keep-alive connections so
+     * that they may connect to another process.
+     */
+    if (!timeout_time) {
+        ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, ap_server_conf,
+                     "All workers are busy or dying, will close %u "
+                     "keep-alive connections", *keepalive_q->total);
+    }
+    process_timeout_queue(keepalive_q, timeout_time,
+                          start_lingering_close_nonblocking);
+}
+
+static void * APR_THREAD_FUNC listener_thread(apr_thread_t * thd, void *dummy)
+{
+    apr_status_t rc;
+    proc_info *ti = dummy;
+    int process_slot = ti->pslot;
+    struct process_score *ps = ap_get_scoreboard_process(process_slot);
+    int closed = 0;
+    int have_idle_worker = 0;
+    apr_time_t last_log;
+
+    last_log = apr_time_now();
+    free(ti);
+
+    /* Unblock the signal used to wake this thread up, and set a handler for
+     * it.
+     */
+    unblock_signal(LISTENER_SIGNAL);
+    apr_signal(LISTENER_SIGNAL, dummy_signal_handler);
+
+    for (;;) {
+        timer_event_t *te;
+        const apr_pollfd_t *out_pfd;
+        apr_int32_t num = 0;
+        apr_interval_time_t timeout_interval;
+        apr_time_t now, timeout_time;
+        int workers_were_busy = 0;
+
+        if (conns_this_child <= 0)
+            check_infinite_requests();
+
+        if (listener_may_exit) {
+            close_listeners(&closed);
+            if (terminate_mode == ST_UNGRACEFUL
+                || apr_atomic_read32(&connection_count) == 0)
+                break;
+        }
+
+        now = apr_time_now();
+        if (APLOGtrace6(ap_server_conf)) {
+            /* trace log status every second */
+            if (now - last_log > apr_time_from_sec(1)) {
+                last_log = now;
+                apr_thread_mutex_lock(timeout_mutex);
+                ap_log_error(APLOG_MARK, APLOG_TRACE6, 0, ap_server_conf,
+                             "connections: %u (clogged: %u write-completion: %d "
+                             "keep-alive: %d lingering: %d suspended: %u)",
+                             apr_atomic_read32(&connection_count),
+                             apr_atomic_read32(&clogged_count),
+                             *(volatile apr_uint32_t*)write_completion_q->total,
+                             *(volatile apr_uint32_t*)keepalive_q->total,
+                             apr_atomic_read32(&lingering_count),
+                             apr_atomic_read32(&suspended_count));
+                if (dying) {
+                    ap_log_error(APLOG_MARK, APLOG_TRACE6, 0, ap_server_conf,
+                                 "%u/%u workers shutdown",
+                                 apr_atomic_read32(&threads_shutdown),
+                                 threads_per_child);
+                }
+                apr_thread_mutex_unlock(timeout_mutex);
+            }
+        }
+
+        /* Start with an infinite poll() timeout and update it according to
+         * the next expiring timer or queue entry. If there are none, either
+         * the listener is wakeable and it can poll() indefinitely until a wake
+         * up occurs, otherwise periodic checks (maintenance, shutdown, ...)
+         * must be performed.
+         */
+        timeout_interval = -1;
+
+        /* Push expired timers to a worker, the first remaining one determines
+         * the maximum time to poll() below, if any.
+         */
+        timeout_time = timers_next_expiry;
+        if (timeout_time && timeout_time < now + EVENT_FUDGE_FACTOR) {
+            apr_thread_mutex_lock(g_timer_skiplist_mtx);
+            while ((te = apr_skiplist_peek(timer_skiplist))) {
+                if (te->when > now + EVENT_FUDGE_FACTOR) {
+                    timers_next_expiry = te->when;
+                    timeout_interval = te->when - now;
+                    break;
+                }
+                apr_skiplist_pop(timer_skiplist, NULL);
+                push_timer2worker(te);
+            }
+            if (!te) {
+                timers_next_expiry = 0;
+            }
+            apr_thread_mutex_unlock(g_timer_skiplist_mtx);
+        }
+
+        /* Same for queues, use their next expiry, if any. */
+        timeout_time = queues_next_expiry;
+        if (timeout_time
+                && (timeout_interval < 0
+                    || timeout_time <= now
+                    || timeout_interval > timeout_time - now)) {
+            timeout_interval = timeout_time > now ? timeout_time - now : 1;
+        }
+
+        /* When non-wakeable, don't wait more than 100 ms, in any case. */
+#define NON_WAKEABLE_POLL_TIMEOUT apr_time_from_msec(100)
+        if (!listener_is_wakeable
+                && (timeout_interval < 0
+                    || timeout_interval > NON_WAKEABLE_POLL_TIMEOUT)) {
+            timeout_interval = NON_WAKEABLE_POLL_TIMEOUT;
+        }
+
+        rc = apr_pollset_poll(event_pollset, timeout_interval, &num, &out_pfd);
+        if (rc != APR_SUCCESS) {
+            if (APR_STATUS_IS_EINTR(rc)) {
+                /* Woken up, if we are exiting or listeners are disabled we
+                 * must fall through to kill kept-alive connections or test
+                 * whether listeners should be re-enabled. Otherwise we only
+                 * need to update timeouts (logic is above, so simply restart
+                 * the loop).
+                 */
+                if (!listener_may_exit && !listeners_disabled()) {
+                    continue;
+                }
+                timeout_time = 0;
+            }
+            else if (!APR_STATUS_IS_TIMEUP(rc)) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rc, ap_server_conf,
+                             "apr_pollset_poll failed.  Attempting to "
+                             "shutdown process gracefully");
+                signal_threads(ST_GRACEFUL);
+            }
+            num = 0;
+        }
+
+        if (listener_may_exit) {
+            close_listeners(&closed);
+            if (terminate_mode == ST_UNGRACEFUL
+                || apr_atomic_read32(&connection_count) == 0)
+                break;
+        }
+
+        for (; num; --num, ++out_pfd) {
+            listener_poll_type *pt = (listener_poll_type *) out_pfd->client_data;
+            if (pt->type == PT_CSD) {
+                /* one of the sockets is readable */
+                event_conn_state_t *cs = (event_conn_state_t *) pt->baton;
+                struct timeout_queue *remove_from_q = NULL;
+                /* don't wait for a worker for a keepalive request or
+                 * lingering close processing. */
+                int blocking = 0;
+
+                switch (cs->pub.state) {
+                case CONN_STATE_WRITE_COMPLETION:
+                    remove_from_q = cs->sc->wc_q;
+                    blocking = 1;
+                    break;
+
+                case CONN_STATE_CHECK_REQUEST_LINE_READABLE:
+                    cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
+                    remove_from_q = cs->sc->ka_q;
+                    break;
+
+                case CONN_STATE_LINGER_NORMAL:
+                    remove_from_q = linger_q;
+                    break;
+
+                case CONN_STATE_LINGER_SHORT:
+                    remove_from_q = short_linger_q;
+                    break;
+
+                default:
+                    ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+                                 ap_server_conf, APLOGNO(03096)
+                                 "event_loop: unexpected state %d",
+                                 cs->pub.state);
+                    ap_assert(0);
+                }
+
+                if (remove_from_q) {
+                    apr_thread_mutex_lock(timeout_mutex);
+                    TO_QUEUE_REMOVE(remove_from_q, cs);
+                    rc = apr_pollset_remove(event_pollset, &cs->pfd);
+                    apr_thread_mutex_unlock(timeout_mutex);
+                    /*
+                     * Some of the pollset backends, like KQueue or Epoll
+                     * automagically remove the FD if the socket is closed,
+                     * therefore, we can accept _SUCCESS or _NOTFOUND,
+                     * and we still want to keep going
+                     */
+                    if (rc != APR_SUCCESS && !APR_STATUS_IS_NOTFOUND(rc)) {
+                        AP_DEBUG_ASSERT(0);
+                        ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
+                                     APLOGNO(03094) "pollset remove failed");
+                        start_lingering_close_nonblocking(cs);
+                        break;
+                    }
+
+                    /* If we don't get a worker immediately (nonblocking), we
+                     * close the connection; the client can re-connect to a
+                     * different process for keepalive, and for lingering close
+                     * the connection will be reset so the choice is to favor
+                     * incoming/alive connections.
+                     */
+                    get_worker(&have_idle_worker, blocking,
+                               &workers_were_busy);
+                    if (!have_idle_worker) {
+                        if (remove_from_q == cs->sc->ka_q) {
+                            start_lingering_close_nonblocking(cs);
+                        }
+                        else {
+                            stop_lingering_close(cs);
+                        }
+                    }
+                    else if (push2worker(cs, NULL, NULL) == APR_SUCCESS) {
+                        have_idle_worker = 0;
+                    }
+                }
+            }
+            else if (pt->type == PT_ACCEPT && !listeners_disabled()) {
+                /* A Listener Socket is ready for an accept() */
+                if (workers_were_busy) {
+                    disable_listensocks();
+                    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+                                 "All workers busy, not accepting new conns "
+                                 "in this process");
+                }
+                else if (connections_above_limit()) {
+                    disable_listensocks();
+                    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+                                 "Too many open connections (%u), "
+                                 "not accepting new conns in this process",
+                                 apr_atomic_read32(&connection_count));
+                    ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, ap_server_conf,
+                                 "Idle workers: %u",
+                                 ap_queue_info_num_idlers(worker_queue_info));
+                    workers_were_busy = 1;
+                }
+                else if (!listener_may_exit) {
+                    void *csd = NULL;
+                    ap_listen_rec *lr = (ap_listen_rec *) pt->baton;
+                    apr_pool_t *ptrans;         /* Pool for per-transaction stuff */
+                    ap_queue_info_pop_pool(worker_queue_info, &ptrans);
+
+                    if (ptrans == NULL) {
+                        /* create a new transaction pool for each accepted socket */
+                        apr_allocator_t *allocator = NULL;
+
+                        rc = apr_allocator_create(&allocator);
+                        if (rc == APR_SUCCESS) {
+                            apr_allocator_max_free_set(allocator,
+                                                       ap_max_mem_free);
+                            rc = apr_pool_create_ex(&ptrans, pconf, NULL,
+                                                    allocator);
+                            if (rc == APR_SUCCESS) {
+                                apr_pool_tag(ptrans, "transaction");
+                                apr_allocator_owner_set(allocator, ptrans);
+                            }
+                        }
+                        if (rc != APR_SUCCESS) {
+                            ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+                                         ap_server_conf, APLOGNO(03097)
+                                         "Failed to create transaction pool");
+                            if (allocator) {
+                                apr_allocator_destroy(allocator);
+                            }
+                            resource_shortage = 1;
+                            signal_threads(ST_GRACEFUL);
+                            continue;
+                        }
+                    }
+
+                    get_worker(&have_idle_worker, 1, &workers_were_busy);
+                    rc = lr->accept_func(&csd, lr, ptrans);
+
+                    /* later we trash rv and rely on csd to indicate
+                     * success/failure
+                     */
+                    AP_DEBUG_ASSERT(rc == APR_SUCCESS || !csd);
+
+                    if (rc == APR_EGENERAL) {
+                        /* E[NM]FILE, ENOMEM, etc */
+                        resource_shortage = 1;
+                        signal_threads(ST_GRACEFUL);
+                    }
+
+                    if (csd != NULL) {
+                        conns_this_child--;
+                        if (push2worker(NULL, csd, ptrans) == APR_SUCCESS) {
+                            have_idle_worker = 0;
+                        }
+                    }
+                    else {
+                        ap_queue_info_push_pool(worker_queue_info, ptrans);
+                    }
+                }
+            }               /* if:else on pt->type */
+        } /* for processing poll */
+
+        /* XXX possible optimization: stash the current time for use as
+         * r->request_time for new requests
+         */
+        /* We process the timeout queues here only when their overall next
+         * expiry (read once above) is over. This happens accurately since
+         * adding to the queues (in workers) can only decrease this expiry,
+         * while latest ones are only taken into account here (in listener)
+         * during queues' processing, with the lock held. This works both
+         * with and without wake-ability.
+         */
+        if (timeout_time && timeout_time < (now = apr_time_now())) {
+            timeout_time = now + TIMEOUT_FUDGE_FACTOR;
+
+            /* handle timed out sockets */
+            apr_thread_mutex_lock(timeout_mutex);
+
+            /* Processing all the queues below will recompute this. */
+            queues_next_expiry = 0;
+
+            /* Step 1: keepalive timeouts */
+            if (workers_were_busy || dying) {
+                process_keepalive_queue(0); /* kill'em all \m/ */
+            }
+            else {
+                process_keepalive_queue(timeout_time);
+            }
+            /* Step 2: write completion timeouts */
+            process_timeout_queue(write_completion_q, timeout_time,
+                                  start_lingering_close_nonblocking);
+            /* Step 3: (normal) lingering close completion timeouts */
+            process_timeout_queue(linger_q, timeout_time,
+                                  stop_lingering_close);
+            /* Step 4: (short) lingering close completion timeouts */
+            process_timeout_queue(short_linger_q, timeout_time,
+                                  stop_lingering_close);
+
+            apr_thread_mutex_unlock(timeout_mutex);
+
+            ps->keep_alive = *(volatile apr_uint32_t*)keepalive_q->total;
+            ps->write_completion = *(volatile apr_uint32_t*)write_completion_q->total;
+            ps->connections = apr_atomic_read32(&connection_count);
+            ps->suspended = apr_atomic_read32(&suspended_count);
+            ps->lingering_close = apr_atomic_read32(&lingering_count);
+        }
+        else if ((workers_were_busy || dying)
+                 && *(volatile apr_uint32_t*)keepalive_q->total) {
+            apr_thread_mutex_lock(timeout_mutex);
+            process_keepalive_queue(0); /* kill'em all \m/ */
+            apr_thread_mutex_unlock(timeout_mutex);
+            ps->keep_alive = 0;
+        }
+
+        /* If there are some lingering closes to defer (to a worker), schedule
+         * them now. We might wakeup a worker spuriously if another one empties
+         * defer_linger_chain in the meantime, but there also may be no active
+         * or all busy workers for an undefined time.  In any case a deferred
+         * lingering close can't starve if we do that here since the chain is
+         * filled only above in the listener and it's emptied only in the
+         * worker(s); thus a NULL here means it will stay so while the listener
+         * waits (possibly indefinitely) in poll().
+         */
+        if (defer_linger_chain) {
+            get_worker(&have_idle_worker, 0, &workers_were_busy);
+            if (have_idle_worker
+                    && defer_linger_chain /* re-test */
+                    && push2worker(NULL, NULL, NULL) == APR_SUCCESS) {
+                have_idle_worker = 0;
+            }
+        }
+
+        if (listeners_disabled()
+                && !workers_were_busy
+                && !connections_above_limit()) {
+            enable_listensocks();
+        }
+    } /* listener main loop */
+
+    close_listeners(&closed);
+    ap_queue_term(worker_queue);
+
+    apr_thread_exit(thd, APR_SUCCESS);
+    return NULL;
+}
+
+/*
+ * During graceful shutdown, if there are more running worker threads than
+ * open connections, exit one worker thread.
+ *
+ * return 1 if thread should exit, 0 if it should continue running.
+ */
+static int worker_thread_should_exit_early(void)
+{
+    for (;;) {
+        apr_uint32_t conns = apr_atomic_read32(&connection_count);
+        apr_uint32_t dead = apr_atomic_read32(&threads_shutdown);
+        apr_uint32_t newdead;
+
+        AP_DEBUG_ASSERT(dead <= threads_per_child);
+        if (conns >= threads_per_child - dead)
+            return 0;
+
+        newdead = dead + 1;
+        if (apr_atomic_cas32(&threads_shutdown, newdead, dead) == dead) {
+            /*
+             * No other thread has exited in the mean time, safe to exit
+             * this one.
+             */
+            return 1;
+        }
+    }
+}
+
+/* XXX For ungraceful termination/restart, we definitely don't want to
+ *     wait for active connections to finish but we may want to wait
+ *     for idle workers to get out of the queue code and release mutexes,
+ *     since those mutexes are cleaned up pretty soon and some systems
+ *     may not react favorably (i.e., segfault) if operations are attempted
+ *     on cleaned-up mutexes.
+ */
+static void *APR_THREAD_FUNC worker_thread(apr_thread_t * thd, void *dummy)
+{
+    proc_info *ti = dummy;
+    int process_slot = ti->pslot;
+    int thread_slot = ti->tslot;
+    apr_status_t rv;
+    int is_idle = 0;
+
+    free(ti);
+
+    ap_scoreboard_image->servers[process_slot][thread_slot].pid = ap_my_pid;
+    ap_scoreboard_image->servers[process_slot][thread_slot].tid = apr_os_thread_current();
+    ap_scoreboard_image->servers[process_slot][thread_slot].generation = retained->mpm->my_generation;
+    ap_update_child_status_from_indexes(process_slot, thread_slot,
+                                        SERVER_STARTING, NULL);
+
+    while (!workers_may_exit) {
+        apr_socket_t *csd = NULL;
+        event_conn_state_t *cs;
+        timer_event_t *te = NULL;
+        apr_pool_t *ptrans;         /* Pool for per-transaction stuff */
+
+        if (!is_idle) {
+            rv = ap_queue_info_set_idle(worker_queue_info, NULL);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+                             "ap_queue_info_set_idle failed. Attempting to "
+                             "shutdown process gracefully.");
+                signal_threads(ST_GRACEFUL);
+                break;
+            }
+            is_idle = 1;
+        }
+
+        ap_update_child_status_from_indexes(process_slot, thread_slot,
+                                            dying ? SERVER_GRACEFUL
+                                                  : SERVER_READY, NULL);
+      worker_pop:
+        if (workers_may_exit) {
+            break;
+        }
+        if (dying && worker_thread_should_exit_early()) {
+            break;
+        }
+
+        rv = ap_queue_pop_something(worker_queue, &csd, (void **)&cs,
+                                    &ptrans, &te);
+
+        if (rv != APR_SUCCESS) {
+            /* We get APR_EOF during a graceful shutdown once all the
+             * connections accepted by this server process have been handled.
+             */
+            if (APR_STATUS_IS_EOF(rv)) {
+                break;
+            }
+            /* We get APR_EINTR whenever ap_queue_pop_*() has been interrupted
+             * from an explicit call to ap_queue_interrupt_all(). This allows
+             * us to unblock threads stuck in ap_queue_pop_*() when a shutdown
+             * is pending.
+             *
+             * If workers_may_exit is set and this is ungraceful termination/
+             * restart, we are bound to get an error on some systems (e.g.,
+             * AIX, which sanity-checks mutex operations) since the queue
+             * may have already been cleaned up.  Don't log the "error" if
+             * workers_may_exit is set.
+             */
+            else if (APR_STATUS_IS_EINTR(rv)) {
+                goto worker_pop;
+            }
+            /* We got some other error. */
+            else if (!workers_may_exit) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
+                             APLOGNO(03099) "ap_queue_pop_socket failed");
+            }
+            continue;
+        }
+        if (te != NULL) {
+            te->cbfunc(te->baton);
+
+            {
+                apr_thread_mutex_lock(g_timer_skiplist_mtx);
+                APR_RING_INSERT_TAIL(&timer_free_ring, te, timer_event_t, link);
+                apr_thread_mutex_unlock(g_timer_skiplist_mtx);
+            }
+        }
+        else {
+            is_idle = 0;
+            if (csd != NULL) {
+                worker_sockets[thread_slot] = csd;
+                process_socket(thd, ptrans, csd, cs, process_slot, thread_slot);
+                worker_sockets[thread_slot] = NULL;
+            }
+        }
+
+        /* If there are deferred lingering closes, handle them now. */
+        while (!workers_may_exit) {
+            cs = defer_linger_chain;
+            if (!cs) {
+                break;
+            }
+            if (apr_atomic_casptr((void *)&defer_linger_chain, cs->chain,
+                                  cs) != cs) {
+                /* Race lost, try again */
+                continue;
+            }
+            cs->chain = NULL;
+
+            worker_sockets[thread_slot] = csd = cs->pfd.desc.s;
+#ifdef AP_DEBUG
+            rv = apr_socket_timeout_set(csd, SECONDS_TO_LINGER);
+            AP_DEBUG_ASSERT(rv == APR_SUCCESS);
+#else
+            apr_socket_timeout_set(csd, SECONDS_TO_LINGER);
+#endif
+            cs->pub.state = CONN_STATE_LINGER;
+            process_socket(thd, cs->p, csd, cs, process_slot, thread_slot);
+            worker_sockets[thread_slot] = NULL;
+        }
+    }
+
+    ap_update_child_status_from_indexes(process_slot, thread_slot,
+                                        dying ? SERVER_DEAD
+                                              : SERVER_GRACEFUL, NULL);
+
+    apr_thread_exit(thd, APR_SUCCESS);
+    return NULL;
+}
+
+static int check_signal(int signum)
+{
+    switch (signum) {
+    case SIGTERM:
+    case SIGINT:
+        return 1;
+    }
+    return 0;
+}
+
+static void create_listener_thread(thread_starter * ts)
+{
+    int my_child_num = ts->child_num_arg;
+    apr_threadattr_t *thread_attr = ts->threadattr;
+    proc_info *my_info;
+    apr_status_t rv;
+
+    my_info = (proc_info *) ap_malloc(sizeof(proc_info));
+    my_info->pslot = my_child_num;
+    my_info->tslot = -1;      /* listener thread doesn't have a thread slot */
+    rv = apr_thread_create(&ts->listener, thread_attr, listener_thread,
+                           my_info, pruntime);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00474)
+                     "apr_thread_create: unable to create listener thread");
+        /* let the parent decide how bad this really is */
+        clean_child_exit(APEXIT_CHILDSICK);
+    }
+    apr_os_thread_get(&listener_os_thread, ts->listener);
+}
+
+static void setup_threads_runtime(void)
+{
+    apr_status_t rv;
+    ap_listen_rec *lr;
+    apr_pool_t *pskip = NULL;
+    int max_recycled_pools = -1, i;
+    const int good_methods[] = { APR_POLLSET_KQUEUE,
+                                 APR_POLLSET_PORT,
+                                 APR_POLLSET_EPOLL };
+    /* XXX: K-A or lingering close connection included in the async factor */
+    const apr_uint32_t async_factor = worker_factor / WORKER_FACTOR_SCALE;
+    const apr_uint32_t pollset_size = (apr_uint32_t)num_listensocks +
+                                      (apr_uint32_t)threads_per_child *
+                                      (async_factor > 2 ? async_factor : 2);
+    int pollset_flags;
+
+    /* Event's skiplist operations will happen concurrently with other modules'
+     * runtime so they need their own pool for allocations, and its lifetime
+     * should be at least the one of the connections (ptrans). Thus pskip is
+     * created as a subpool of pconf like/before ptrans (before so that it's
+     * destroyed after). In forked mode pconf is never destroyed so we are good
+     * anyway, but in ONE_PROCESS mode this ensures that the skiplist works
+     * from connection/ptrans cleanups (even after pchild is destroyed).
+     */
+    apr_pool_create(&pskip, pconf);
+    apr_pool_tag(pskip, "mpm_skiplist");
+    apr_thread_mutex_create(&g_timer_skiplist_mtx, APR_THREAD_MUTEX_DEFAULT, pskip);
+    APR_RING_INIT(&timer_free_ring, timer_event_t, link);
+    apr_skiplist_init(&timer_skiplist, pskip);
+    apr_skiplist_set_compare(timer_skiplist, timer_comp, timer_comp);
+
+    /* All threads (listener, workers) and synchronization objects (queues,
+     * pollset, mutexes...) created here should have at least the lifetime of
+     * the connections they handle (i.e. ptrans). We can't use this thread's
+     * self pool because all these objects survive it, nor use pchild or pconf
+     * directly because this starter thread races with other modules' runtime,
+     * nor finally pchild (or subpool thereof) because it is killed explicitely
+     * before pconf (thus connections/ptrans can live longer, which matters in
+     * ONE_PROCESS mode). So this leaves us with a subpool of pconf, created
+     * before any ptrans hence destroyed after.
+     */
+    apr_pool_create(&pruntime, pconf);
+    apr_pool_tag(pruntime, "mpm_runtime");
+
+    /* We must create the fd queues before we start up the listener
+     * and worker threads. */
+    rv = ap_queue_create(&worker_queue, threads_per_child, pruntime);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(03100)
+                     "ap_queue_create() failed");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    if (ap_max_mem_free != APR_ALLOCATOR_MAX_FREE_UNLIMITED) {
+        /* If we want to conserve memory, let's not keep an unlimited number of
+         * pools & allocators.
+         * XXX: This should probably be a separate config directive
+         */
+        max_recycled_pools = threads_per_child * 3 / 4 ;
+    }
+    rv = ap_queue_info_create(&worker_queue_info, pruntime,
+                              threads_per_child, max_recycled_pools);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(03101)
+                     "ap_queue_info_create() failed");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Create the timeout mutex and main pollset before the listener
+     * thread starts.
+     */
+    rv = apr_thread_mutex_create(&timeout_mutex, APR_THREAD_MUTEX_DEFAULT,
+                                 pruntime);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(03102)
+                     "creation of the timeout mutex failed.");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Create the main pollset */
+    pollset_flags = APR_POLLSET_THREADSAFE | APR_POLLSET_NOCOPY |
+                    APR_POLLSET_NODEFAULT | APR_POLLSET_WAKEABLE;
+    for (i = 0; i < sizeof(good_methods) / sizeof(good_methods[0]); i++) {
+        rv = apr_pollset_create_ex(&event_pollset, pollset_size, pruntime,
+                                   pollset_flags, good_methods[i]);
+        if (rv == APR_SUCCESS) {
+            listener_is_wakeable = 1;
+            break;
+        }
+    }
+    if (rv != APR_SUCCESS) {
+        pollset_flags &= ~APR_POLLSET_WAKEABLE;
+        for (i = 0; i < sizeof(good_methods) / sizeof(good_methods[0]); i++) {
+            rv = apr_pollset_create_ex(&event_pollset, pollset_size, pruntime,
+                                       pollset_flags, good_methods[i]);
+            if (rv == APR_SUCCESS) {
+                break;
+            }
+        }
+    }
+    if (rv != APR_SUCCESS) {
+        pollset_flags &= ~APR_POLLSET_NODEFAULT;
+        rv = apr_pollset_create(&event_pollset, pollset_size, pruntime,
+                                pollset_flags);
+    }
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(03103)
+                     "apr_pollset_create with Thread Safety failed.");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Add listeners to the main pollset */
+    listener_pollfd = apr_pcalloc(pruntime, num_listensocks *
+                                            sizeof(apr_pollfd_t));
+    for (i = 0, lr = my_bucket->listeners; lr; lr = lr->next, i++) {
+        apr_pollfd_t *pfd;
+        listener_poll_type *pt;
+
+        AP_DEBUG_ASSERT(i < num_listensocks);
+        pfd = &listener_pollfd[i];
+
+        pfd->reqevents = APR_POLLIN;
+        pfd->desc_type = APR_POLL_SOCKET;
+        pfd->desc.s = lr->sd;
+
+        pt = apr_pcalloc(pruntime, sizeof(*pt));
+        pfd->client_data = pt;
+        pt->type = PT_ACCEPT;
+        pt->baton = lr;
+
+        apr_socket_opt_set(pfd->desc.s, APR_SO_NONBLOCK, 1);
+        apr_pollset_add(event_pollset, pfd);
+
+        lr->accept_func = ap_unixd_accept;
+    }
+
+    worker_sockets = apr_pcalloc(pruntime, threads_per_child *
+                                           sizeof(apr_socket_t *));
+}
+
+/* XXX under some circumstances not understood, children can get stuck
+ *     in start_threads forever trying to take over slots which will
+ *     never be cleaned up; for now there is an APLOG_DEBUG message issued
+ *     every so often when this condition occurs
+ */
+static void *APR_THREAD_FUNC start_threads(apr_thread_t * thd, void *dummy)
+{
+    thread_starter *ts = dummy;
+    apr_thread_t **threads = ts->threads;
+    apr_threadattr_t *thread_attr = ts->threadattr;
+    int my_child_num = ts->child_num_arg;
+    proc_info *my_info;
+    apr_status_t rv;
+    int threads_created = 0;
+    int listener_started = 0;
+    int prev_threads_created;
+    int loops, i;
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02471)
+                 "start_threads: Using %s (%swakeable)",
+                 apr_pollset_method_name(event_pollset),
+                 listener_is_wakeable ? "" : "not ");
+
+    loops = prev_threads_created = 0;
+    while (1) {
+        /* threads_per_child does not include the listener thread */
+        for (i = 0; i < threads_per_child; i++) {
+            int status =
+                ap_scoreboard_image->servers[my_child_num][i].status;
+
+            if (status != SERVER_DEAD) {
+                continue;
+            }
+
+            my_info = (proc_info *) ap_malloc(sizeof(proc_info));
+            my_info->pslot = my_child_num;
+            my_info->tslot = i;
+
+            /* We are creating threads right now */
+            ap_update_child_status_from_indexes(my_child_num, i,
+                                                SERVER_STARTING, NULL);
+            /* We let each thread update its own scoreboard entry.  This is
+             * done because it lets us deal with tid better.
+             */
+            rv = apr_thread_create(&threads[i], thread_attr,
+                                   worker_thread, my_info, pruntime);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
+                             APLOGNO(03104)
+                             "apr_thread_create: unable to create worker thread");
+                /* let the parent decide how bad this really is */
+                clean_child_exit(APEXIT_CHILDSICK);
+            }
+            threads_created++;
+        }
+
+        /* Start the listener only when there are workers available */
+        if (!listener_started && threads_created) {
+            create_listener_thread(ts);
+            listener_started = 1;
+        }
+
+
+        if (start_thread_may_exit || threads_created == threads_per_child) {
+            break;
+        }
+        /* wait for previous generation to clean up an entry */
+        apr_sleep(apr_time_from_sec(1));
+        ++loops;
+        if (loops % 120 == 0) { /* every couple of minutes */
+            if (prev_threads_created == threads_created) {
+                ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+                             "child %" APR_PID_T_FMT " isn't taking over "
+                             "slots very quickly (%d of %d)",
+                             ap_my_pid, threads_created,
+                             threads_per_child);
+            }
+            prev_threads_created = threads_created;
+        }
+    }
+
+    /* What state should this child_main process be listed as in the
+     * scoreboard...?
+     *  ap_update_child_status_from_indexes(my_child_num, i, SERVER_STARTING,
+     *                                      (request_rec *) NULL);
+     *
+     *  This state should be listed separately in the scoreboard, in some kind
+     *  of process_status, not mixed in with the worker threads' status.
+     *  "life_status" is almost right, but it's in the worker's structure, and
+     *  the name could be clearer.   gla
+     */
+    apr_thread_exit(thd, APR_SUCCESS);
+    return NULL;
+}
+
+static void join_workers(apr_thread_t * listener, apr_thread_t ** threads)
+{
+    int i;
+    apr_status_t rv, thread_rv;
+
+    if (listener) {
+        int iter;
+
+        /* deal with a rare timing window which affects waking up the
+         * listener thread...  if the signal sent to the listener thread
+         * is delivered between the time it verifies that the
+         * listener_may_exit flag is clear and the time it enters a
+         * blocking syscall, the signal didn't do any good...  work around
+         * that by sleeping briefly and sending it again
+         */
+
+        iter = 0;
+        while (iter < 10 && !dying) {
+            /* listener has not stopped accepting yet */
+            apr_sleep(apr_time_make(0, 500000));
+            wakeup_listener();
+            ++iter;
+        }
+        if (iter >= 10) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00475)
+                         "the listener thread didn't stop accepting");
+        }
+        else {
+            rv = apr_thread_join(&thread_rv, listener);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00476)
+                             "apr_thread_join: unable to join listener thread");
+            }
+        }
+    }
+
+    for (i = 0; i < threads_per_child; i++) {
+        if (threads[i]) {       /* if we ever created this thread */
+            rv = apr_thread_join(&thread_rv, threads[i]);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00477)
+                             "apr_thread_join: unable to join worker "
+                             "thread %d", i);
+            }
+        }
+    }
+}
+
+static void join_start_thread(apr_thread_t * start_thread_id)
+{
+    apr_status_t rv, thread_rv;
+
+    start_thread_may_exit = 1;  /* tell it to give up in case it is still
+                                 * trying to take over slots from a
+                                 * previous generation
+                                 */
+    rv = apr_thread_join(&thread_rv, start_thread_id);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00478)
+                     "apr_thread_join: unable to join the start " "thread");
+    }
+}
+
+static void child_main(int child_num_arg, int child_bucket)
+{
+    apr_thread_t **threads;
+    apr_status_t rv;
+    thread_starter *ts;
+    apr_threadattr_t *thread_attr;
+    apr_thread_t *start_thread_id;
+    int i;
+
+    /* for benefit of any hooks that run as this child initializes */
+    retained->mpm->mpm_state = AP_MPMQ_STARTING;
+
+    ap_my_pid = getpid();
+    ap_child_slot = child_num_arg;
+    ap_fatal_signal_child_setup(ap_server_conf);
+
+    /* Get a sub context for global allocations in this child, so that
+     * we can have cleanups occur when the child exits.
+     */
+    apr_pool_create(&pchild, pconf);
+    apr_pool_tag(pchild, "pchild");
+
+    /* close unused listeners and pods */
+    for (i = 0; i < retained->mpm->num_buckets; i++) {
+        if (i != child_bucket) {
+            ap_close_listeners_ex(all_buckets[i].listeners);
+            ap_mpm_podx_close(all_buckets[i].pod);
+        }
+    }
+
+    /*stuff to do before we switch id's, so we have permissions. */
+    ap_reopen_scoreboard(pchild, NULL, 0);
+
+    /* done with init critical section */
+    if (ap_run_drop_privileges(pchild, ap_server_conf)) {
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Just use the standard apr_setup_signal_thread to block all signals
+     * from being received.  The child processes no longer use signals for
+     * any communication with the parent process. Let's also do this before
+     * child_init() hooks are called and possibly create threads that
+     * otherwise could "steal" (implicitely) MPM's signals.
+     */
+    rv = apr_setup_signal_thread();
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00479)
+                     "Couldn't initialize signal thread");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    ap_run_child_init(pchild, ap_server_conf);
+
+    if (ap_max_requests_per_child) {
+        conns_this_child = ap_max_requests_per_child;
+    }
+    else {
+        /* coding a value of zero means infinity */
+        conns_this_child = APR_INT32_MAX;
+    }
+
+    /* Setup threads */
+
+    /* Globals used by signal_threads() so to be initialized before */
+    setup_threads_runtime();
+
+    /* clear the storage; we may not create all our threads immediately,
+     * and we want a 0 entry to indicate a thread which was not created
+     */
+    threads = ap_calloc(threads_per_child, sizeof(apr_thread_t *));
+    ts = apr_palloc(pchild, sizeof(*ts));
+
+    apr_threadattr_create(&thread_attr, pchild);
+    /* 0 means PTHREAD_CREATE_JOINABLE */
+    apr_threadattr_detach_set(thread_attr, 0);
+
+    if (ap_thread_stacksize != 0) {
+        rv = apr_threadattr_stacksize_set(thread_attr, ap_thread_stacksize);
+        if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, APLOGNO(02436)
+                         "WARNING: ThreadStackSize of %" APR_SIZE_T_FMT " is "
+                         "inappropriate, using default", 
+                         ap_thread_stacksize);
+        }
+    }
+
+    ts->threads = threads;
+    ts->listener = NULL;
+    ts->child_num_arg = child_num_arg;
+    ts->threadattr = thread_attr;
+
+    rv = apr_thread_create(&start_thread_id, thread_attr, start_threads,
+                           ts, pchild);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00480)
+                     "apr_thread_create: unable to create worker thread");
+        /* let the parent decide how bad this really is */
+        clean_child_exit(APEXIT_CHILDSICK);
+    }
+
+    retained->mpm->mpm_state = AP_MPMQ_RUNNING;
+
+    /* If we are only running in one_process mode, we will want to
+     * still handle signals. */
+    if (one_process) {
+        /* Block until we get a terminating signal. */
+        apr_signal_thread(check_signal);
+        /* make sure the start thread has finished; signal_threads()
+         * and join_workers() depend on that
+         */
+        /* XXX join_start_thread() won't be awakened if one of our
+         *     threads encounters a critical error and attempts to
+         *     shutdown this child
+         */
+        join_start_thread(start_thread_id);
+
+        /* helps us terminate a little more quickly than the dispatch of the
+         * signal thread; beats the Pipe of Death and the browsers
+         */
+        signal_threads(ST_UNGRACEFUL);
+
+        /* A terminating signal was received. Now join each of the
+         * workers to clean them up.
+         *   If the worker already exited, then the join frees
+         *   their resources and returns.
+         *   If the worker hasn't exited, then this blocks until
+         *   they have (then cleans up).
+         */
+        join_workers(ts->listener, threads);
+    }
+    else {                      /* !one_process */
+        /* remove SIGTERM from the set of blocked signals...  if one of
+         * the other threads in the process needs to take us down
+         * (e.g., for MaxConnectionsPerChild) it will send us SIGTERM
+         */
+        unblock_signal(SIGTERM);
+        apr_signal(SIGTERM, dummy_signal_handler);
+        /* Watch for any messages from the parent over the POD */
+        while (1) {
+            rv = ap_mpm_podx_check(my_bucket->pod);
+            if (rv == AP_MPM_PODX_NORESTART) {
+                /* see if termination was triggered while we slept */
+                switch (terminate_mode) {
+                case ST_GRACEFUL:
+                    rv = AP_MPM_PODX_GRACEFUL;
+                    break;
+                case ST_UNGRACEFUL:
+                    rv = AP_MPM_PODX_RESTART;
+                    break;
+                }
+            }
+            if (rv == AP_MPM_PODX_GRACEFUL || rv == AP_MPM_PODX_RESTART) {
+                /* make sure the start thread has finished;
+                 * signal_threads() and join_workers depend on that
+                 */
+                join_start_thread(start_thread_id);
+                signal_threads(rv ==
+                               AP_MPM_PODX_GRACEFUL ? ST_GRACEFUL : ST_UNGRACEFUL);
+                break;
+            }
+        }
+
+        /* A terminating signal was received. Now join each of the
+         * workers to clean them up.
+         *   If the worker already exited, then the join frees
+         *   their resources and returns.
+         *   If the worker hasn't exited, then this blocks until
+         *   they have (then cleans up).
+         */
+        join_workers(ts->listener, threads);
+    }
+
+    free(threads);
+
+    clean_child_exit(resource_shortage ? APEXIT_CHILDSICK : 0);
+}
+
+static int make_child(server_rec * s, int slot, int bucket)
+{
+    int pid;
+
+    if (slot + 1 > retained->max_daemons_limit) {
+        retained->max_daemons_limit = slot + 1;
+    }
+
+    if (ap_scoreboard_image->parent[slot].pid != 0) {
+        /* XXX replace with assert or remove ? */
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(03455)
+                 "BUG: Scoreboard slot %d should be empty but is "
+                 "in use by pid %" APR_PID_T_FMT,
+                 slot, ap_scoreboard_image->parent[slot].pid);
+        return -1;
+    }
+
+    if (one_process) {
+        my_bucket = &all_buckets[0];
+
+        event_note_child_started(slot, getpid());
+        child_main(slot, 0);
+        /* NOTREACHED */
+        ap_assert(0);
+        return -1;
+    }
+
+    if ((pid = fork()) == -1) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, APLOGNO(00481)
+                     "fork: Unable to fork new process");
+
+        /* fork didn't succeed.  There's no need to touch the scoreboard;
+         * if we were trying to replace a failed child process, then
+         * server_main_loop() marked its workers SERVER_DEAD, and if
+         * we were trying to replace a child process that exited normally,
+         * its worker_thread()s left SERVER_DEAD or SERVER_GRACEFUL behind.
+         */
+
+        /* In case system resources are maxxed out, we don't want
+           Apache running away with the CPU trying to fork over and
+           over and over again. */
+        apr_sleep(apr_time_from_sec(10));
+
+        return -1;
+    }
+
+    if (!pid) {
+        my_bucket = &all_buckets[bucket];
+
+#ifdef HAVE_BINDPROCESSOR
+        /* By default, AIX binds to a single processor.  This bit unbinds
+         * children which will then bind to another CPU.
+         */
+        int status = bindprocessor(BINDPROCESS, (int) getpid(),
+                                   PROCESSOR_CLASS_ANY);
+        if (status != OK)
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, errno,
+                         ap_server_conf, APLOGNO(00482)
+                         "processor unbind failed");
+#endif
+        RAISE_SIGSTOP(MAKE_CHILD);
+
+        apr_signal(SIGTERM, just_die);
+        child_main(slot, bucket);
+        /* NOTREACHED */
+        ap_assert(0);
+        return -1;
+    }
+
+    ap_scoreboard_image->parent[slot].quiescing = 0;
+    ap_scoreboard_image->parent[slot].not_accepting = 0;
+    ap_scoreboard_image->parent[slot].bucket = bucket;
+    event_note_child_started(slot, pid);
+    active_daemons++;
+    retained->total_daemons++;
+    return 0;
+}
+
+/* start up a bunch of children */
+static void startup_children(int number_to_start)
+{
+    int i;
+
+    for (i = 0; number_to_start && i < server_limit; ++i) {
+        if (ap_scoreboard_image->parent[i].pid != 0) {
+            continue;
+        }
+        if (make_child(ap_server_conf, i, i % retained->mpm->num_buckets) < 0) {
+            break;
+        }
+        --number_to_start;
+    }
+}
+
+static void perform_idle_server_maintenance(int child_bucket, int num_buckets)
+{
+    int i, j;
+    int idle_thread_count = 0;
+    worker_score *ws;
+    process_score *ps;
+    int free_length = 0;
+    int free_slots[MAX_SPAWN_RATE];
+    int last_non_dead = -1;
+    int active_thread_count = 0;
+
+    for (i = 0; i < server_limit; ++i) {
+        /* Initialization to satisfy the compiler. It doesn't know
+         * that threads_per_child is always > 0 */
+        int status = SERVER_DEAD;
+        int child_threads_active = 0;
+
+        if (i >= retained->max_daemons_limit &&
+            free_length == retained->idle_spawn_rate[child_bucket]) {
+            /* short cut if all active processes have been examined and
+             * enough empty scoreboard slots have been found
+             */
+
+            break;
+        }
+        ps = &ap_scoreboard_image->parent[i];
+        if (ps->pid != 0) {
+            for (j = 0; j < threads_per_child; j++) {
+                ws = &ap_scoreboard_image->servers[i][j];
+                status = ws->status;
+
+                /* We consider a starting server as idle because we started it
+                 * at least a cycle ago, and if it still hasn't finished starting
+                 * then we're just going to swamp things worse by forking more.
+                 * So we hopefully won't need to fork more if we count it.
+                 * This depends on the ordering of SERVER_READY and SERVER_STARTING.
+                 */
+                if (status <= SERVER_READY && !ps->quiescing && !ps->not_accepting
+                    && ps->generation == retained->mpm->my_generation
+                    && ps->bucket == child_bucket)
+                {
+                    ++idle_thread_count;
+                }
+                if (status >= SERVER_READY && status < SERVER_GRACEFUL) {
+                    ++child_threads_active;
+                }
+            }
+            last_non_dead = i;
+        }
+        active_thread_count += child_threads_active;
+        if (!ps->pid && free_length < retained->idle_spawn_rate[child_bucket])
+            free_slots[free_length++] = i;
+        else if (child_threads_active == threads_per_child)
+            had_healthy_child = 1;
+    }
+
+    if (retained->sick_child_detected) {
+        if (had_healthy_child) {
+            /* Assume this is a transient error, even though it may not be.  Leave
+             * the server up in case it is able to serve some requests or the
+             * problem will be resolved.
+             */
+            retained->sick_child_detected = 0;
+        }
+        else {
+            /* looks like a basket case, as no child ever fully initialized; give up.
+             */
+            retained->mpm->shutdown_pending = 1;
+            child_fatal = 1;
+            ap_log_error(APLOG_MARK, APLOG_ALERT, 0,
+                         ap_server_conf, APLOGNO(02324)
+                         "A resource shortage or other unrecoverable failure "
+                         "was encountered before any child process initialized "
+                         "successfully... httpd is exiting!");
+            /* the child already logged the failure details */
+            return;
+        }
+    }
+
+    retained->max_daemons_limit = last_non_dead + 1;
+
+    if (idle_thread_count > max_spare_threads / num_buckets)
+    {
+        /*
+         * Child processes that we ask to shut down won't die immediately
+         * but may stay around for a long time when they finish their
+         * requests. If the server load changes many times, many such
+         * gracefully finishing processes may accumulate, filling up the
+         * scoreboard. To avoid running out of scoreboard entries, we
+         * don't shut down more processes when the total number of processes
+         * is high.
+         *
+         * XXX It would be nice if we could
+         * XXX - kill processes without keepalive connections first
+         * XXX - tell children to stop accepting new connections, and
+         * XXX   depending on server load, later be able to resurrect them
+         *       or kill them
+         */
+        if (retained->total_daemons <= active_daemons_limit &&
+            retained->total_daemons < server_limit) {
+            /* Kill off one child */
+            ap_mpm_podx_signal(all_buckets[child_bucket].pod,
+                               AP_MPM_PODX_GRACEFUL);
+            retained->idle_spawn_rate[child_bucket] = 1;
+            active_daemons--;
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_TRACE5, 0, ap_server_conf,
+                         "Not shutting down child: total daemons %d / "
+                         "active limit %d / ServerLimit %d",
+                         retained->total_daemons, active_daemons_limit,
+                         server_limit);
+        }
+    }
+    else if (idle_thread_count < min_spare_threads / num_buckets) {
+        if (active_thread_count >= max_workers) {
+            if (0 == idle_thread_count) { 
+                if (!retained->maxclients_reported) {
+                    ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00484)
+                                 "server reached MaxRequestWorkers setting, "
+                                 "consider raising the MaxRequestWorkers "
+                                 "setting");
+                    retained->maxclients_reported = 1;
+                }
+             }
+             else { 
+                if (!retained->near_maxclients_reported) {
+                    ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(10159)
+                            "server is within MinSpareThreads of "
+                            "MaxRequestWorkers, consider raising the "
+                            "MaxRequestWorkers setting");
+                    retained->near_maxclients_reported = 1;
+                }
+            }
+            retained->idle_spawn_rate[child_bucket] = 1;
+        }
+        else if (free_length == 0) { /* scoreboard is full, can't fork */
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(03490)
+                         "scoreboard is full, not at MaxRequestWorkers."
+                         "Increase ServerLimit.");
+            retained->idle_spawn_rate[child_bucket] = 1;
+        }
+        else {
+            if (free_length > retained->idle_spawn_rate[child_bucket]) {
+                free_length = retained->idle_spawn_rate[child_bucket];
+            }
+            if (retained->idle_spawn_rate[child_bucket] >= 8) {
+                ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00486)
+                             "server seems busy, (you may need "
+                             "to increase StartServers, ThreadsPerChild "
+                             "or Min/MaxSpareThreads), "
+                             "spawning %d children, there are around %d idle "
+                             "threads, %d active children, and %d children "
+                             "that are shutting down", free_length,
+                             idle_thread_count, active_daemons,
+                             retained->total_daemons);
+            }
+            for (i = 0; i < free_length; ++i) {
+                ap_log_error(APLOG_MARK, APLOG_TRACE5, 0, ap_server_conf,
+                             "Spawning new child: slot %d active / "
+                             "total daemons: %d/%d",
+                             free_slots[i], active_daemons,
+                             retained->total_daemons);
+                make_child(ap_server_conf, free_slots[i], child_bucket);
+            }
+            /* the next time around we want to spawn twice as many if this
+             * wasn't good enough, but not if we've just done a graceful
+             */
+            if (retained->hold_off_on_exponential_spawning) {
+                --retained->hold_off_on_exponential_spawning;
+            }
+            else if (retained->idle_spawn_rate[child_bucket]
+                     < MAX_SPAWN_RATE / num_buckets) {
+                retained->idle_spawn_rate[child_bucket] *= 2;
+            }
+        }
+    }
+    else {
+        retained->idle_spawn_rate[child_bucket] = 1;
+    }
+}
+
+static void server_main_loop(int remaining_children_to_start, int num_buckets)
+{
+    int child_slot;
+    apr_exit_why_e exitwhy;
+    int status, processed_status;
+    apr_proc_t pid;
+    int i;
+
+    while (!retained->mpm->restart_pending && !retained->mpm->shutdown_pending) {
+        ap_wait_or_timeout(&exitwhy, &status, &pid, pconf, ap_server_conf);
+
+        if (pid.pid != -1) {
+            processed_status = ap_process_child_status(&pid, exitwhy, status);
+            child_slot = ap_find_child_by_pid(&pid);
+            if (processed_status == APEXIT_CHILDFATAL) {
+                /* fix race condition found in PR 39311
+                 * A child created at the same time as a graceful happens 
+                 * can find the lock missing and create a fatal error.
+                 * It is not fatal for the last generation to be in this state.
+                 */
+                if (child_slot < 0
+                    || ap_get_scoreboard_process(child_slot)->generation
+                       == retained->mpm->my_generation) {
+                    retained->mpm->shutdown_pending = 1;
+                    child_fatal = 1;
+                    /*
+                     * total_daemons counting will be off now, but as we
+                     * are shutting down, that is not an issue anymore.
+                     */
+                    return;
+                }
+                else {
+                    ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00487)
+                                 "Ignoring fatal error in child of previous "
+                                 "generation (pid %ld).",
+                                 (long)pid.pid);
+                    retained->sick_child_detected = 1;
+                }
+            }
+            else if (processed_status == APEXIT_CHILDSICK) {
+                /* tell perform_idle_server_maintenance to check into this
+                 * on the next timer pop
+                 */
+                retained->sick_child_detected = 1;
+            }
+            /* non-fatal death... note that it's gone in the scoreboard. */
+            if (child_slot >= 0) {
+                process_score *ps;
+
+                for (i = 0; i < threads_per_child; i++)
+                    ap_update_child_status_from_indexes(child_slot, i,
+                                                        SERVER_DEAD, NULL);
+
+                event_note_child_killed(child_slot, 0, 0);
+                ps = &ap_scoreboard_image->parent[child_slot];
+                if (!ps->quiescing)
+                    active_daemons--;
+                ps->quiescing = 0;
+                /* NOTE: We don't dec in the (child_slot < 0) case! */
+                retained->total_daemons--;
+                if (processed_status == APEXIT_CHILDSICK) {
+                    /* resource shortage, minimize the fork rate */
+                    retained->idle_spawn_rate[ps->bucket] = 1;
+                }
+                else if (remaining_children_to_start) {
+                    /* we're still doing a 1-for-1 replacement of dead
+                     * children with new children
+                     */
+                    make_child(ap_server_conf, child_slot, ps->bucket);
+                    --remaining_children_to_start;
+                }
+            }
+#if APR_HAS_OTHER_CHILD
+            else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH,
+                                                status) == 0) {
+                /* handled */
+            }
+#endif
+            else if (retained->mpm->was_graceful) {
+                /* Great, we've probably just lost a slot in the
+                 * scoreboard.  Somehow we don't know about this child.
+                 */
+                ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
+                             ap_server_conf, APLOGNO(00488)
+                             "long lost child came home! (pid %ld)",
+                             (long) pid.pid);
+            }
+            /* Don't perform idle maintenance when a child dies,
+             * only do it when there's a timeout.  Remember only a
+             * finite number of children can die, and it's pretty
+             * pathological for a lot to die suddenly.
+             */
+            continue;
+        }
+        else if (remaining_children_to_start) {
+            /* we hit a 1 second timeout in which none of the previous
+             * generation of children needed to be reaped... so assume
+             * they're all done, and pick up the slack if any is left.
+             */
+            startup_children(remaining_children_to_start);
+            remaining_children_to_start = 0;
+            /* In any event we really shouldn't do the code below because
+             * few of the servers we just started are in the IDLE state
+             * yet, so we'd mistakenly create an extra server.
+             */
+            continue;
+        }
+
+        for (i = 0; i < num_buckets; i++) {
+            perform_idle_server_maintenance(i, num_buckets);
+        }
+    }
+}
+
+static int event_run(apr_pool_t * _pconf, apr_pool_t * plog, server_rec * s)
+{
+    int num_buckets = retained->mpm->num_buckets;
+    int remaining_children_to_start;
+    int i;
+
+    ap_log_pid(pconf, ap_pid_fname);
+
+    if (!retained->mpm->was_graceful) {
+        if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+            retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+            return !OK;
+        }
+        /* fix the generation number in the global score; we just got a new,
+         * cleared scoreboard
+         */
+        ap_scoreboard_image->global->running_generation = retained->mpm->my_generation;
+    }
+
+    ap_unixd_mpm_set_signals(pconf, one_process);
+
+    /* Don't thrash since num_buckets depends on the
+     * system and the number of online CPU cores...
+     */
+    if (active_daemons_limit < num_buckets)
+        active_daemons_limit = num_buckets;
+    if (ap_daemons_to_start < num_buckets)
+        ap_daemons_to_start = num_buckets;
+    /* We want to create as much children at a time as the number of buckets,
+     * so to optimally accept connections (evenly distributed across buckets).
+     * Thus min_spare_threads should at least maintain num_buckets children,
+     * and max_spare_threads allow num_buckets more children w/o triggering
+     * immediately (e.g. num_buckets idle threads margin, one per bucket).
+     */
+    if (min_spare_threads < threads_per_child * (num_buckets - 1) + num_buckets)
+        min_spare_threads = threads_per_child * (num_buckets - 1) + num_buckets;
+    if (max_spare_threads < min_spare_threads + (threads_per_child + 1) * num_buckets)
+        max_spare_threads = min_spare_threads + (threads_per_child + 1) * num_buckets;
+
+    /* If we're doing a graceful_restart then we're going to see a lot
+     * of children exiting immediately when we get into the main loop
+     * below (because we just sent them AP_SIG_GRACEFUL).  This happens pretty
+     * rapidly... and for each one that exits we may start a new one, until
+     * there are at least min_spare_threads idle threads, counting across
+     * all children.  But we may be permitted to start more children than
+     * that, so we'll just keep track of how many we're
+     * supposed to start up without the 1 second penalty between each fork.
+     */
+    remaining_children_to_start = ap_daemons_to_start;
+    if (remaining_children_to_start > active_daemons_limit) {
+        remaining_children_to_start = active_daemons_limit;
+    }
+    if (!retained->mpm->was_graceful) {
+        startup_children(remaining_children_to_start);
+        remaining_children_to_start = 0;
+    }
+    else {
+        /* give the system some time to recover before kicking into
+         * exponential mode */
+        retained->hold_off_on_exponential_spawning = 10;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00489)
+                 "%s configured -- resuming normal operations",
+                 ap_get_server_description());
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00490)
+                 "Server built: %s", ap_get_server_built());
+    ap_log_command_line(plog, s);
+    ap_log_mpm_common(s);
+
+    retained->mpm->mpm_state = AP_MPMQ_RUNNING;
+
+    server_main_loop(remaining_children_to_start, num_buckets);
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+
+    if (retained->mpm->shutdown_pending && retained->mpm->is_ungraceful) {
+        /* Time to shut down:
+         * Kill child processes, tell them to call child_exit, etc...
+         */
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, active_daemons_limit,
+                               AP_MPM_PODX_RESTART);
+        }
+        ap_reclaim_child_processes(1, /* Start with SIGTERM */
+                                   event_note_child_killed);
+
+        if (!child_fatal) {
+            /* cleanup pid file on normal shutdown */
+            ap_remove_pid(pconf, ap_pid_fname);
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, 0,
+                         ap_server_conf, APLOGNO(00491) "caught SIGTERM, shutting down");
+        }
+
+        return DONE;
+    }
+
+    if (retained->mpm->shutdown_pending) {
+        /* Time to gracefully shut down:
+         * Kill child processes, tell them to call child_exit, etc...
+         */
+        int active_children;
+        int index;
+        apr_time_t cutoff = 0;
+
+        /* Close our listeners, and then ask our children to do same */
+        ap_close_listeners();
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, active_daemons_limit,
+                               AP_MPM_PODX_GRACEFUL);
+        }
+        ap_relieve_child_processes(event_note_child_killed);
+
+        if (!child_fatal) {
+            /* cleanup pid file on normal shutdown */
+            ap_remove_pid(pconf, ap_pid_fname);
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00492)
+                         "caught " AP_SIG_GRACEFUL_STOP_STRING
+                         ", shutting down gracefully");
+        }
+
+        if (ap_graceful_shutdown_timeout) {
+            cutoff = apr_time_now() +
+                     apr_time_from_sec(ap_graceful_shutdown_timeout);
+        }
+
+        /* Don't really exit until each child has finished */
+        retained->mpm->shutdown_pending = 0;
+        do {
+            /* Pause for a second */
+            apr_sleep(apr_time_from_sec(1));
+
+            /* Relieve any children which have now exited */
+            ap_relieve_child_processes(event_note_child_killed);
+
+            active_children = 0;
+            for (index = 0; index < retained->max_daemons_limit; ++index) {
+                if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
+                    active_children = 1;
+                    /* Having just one child is enough to stay around */
+                    break;
+                }
+            }
+        } while (!retained->mpm->shutdown_pending && active_children &&
+                 (!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
+
+        /* We might be here because we received SIGTERM, either
+         * way, try and make sure that all of our processes are
+         * really dead.
+         */
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, active_daemons_limit,
+                               AP_MPM_PODX_RESTART);
+        }
+        ap_reclaim_child_processes(1, event_note_child_killed);
+
+        return DONE;
+    }
+
+    /* we've been told to restart */
+    if (one_process) {
+        /* not worth thinking about */
+        return DONE;
+    }
+
+    /* advance to the next generation */
+    /* XXX: we really need to make sure this new generation number isn't in
+     * use by any of the children.
+     */
+    ++retained->mpm->my_generation;
+    ap_scoreboard_image->global->running_generation = retained->mpm->my_generation;
+
+    if (!retained->mpm->is_ungraceful) {
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00493)
+                     AP_SIG_GRACEFUL_STRING
+                     " received.  Doing graceful restart");
+        /* wake up the children...time to die.  But we'll have more soon */
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, active_daemons_limit,
+                               AP_MPM_PODX_GRACEFUL);
+        }
+
+        /* This is mostly for debugging... so that we know what is still
+         * gracefully dealing with existing request.
+         */
+
+    }
+    else {
+        /* Kill 'em all.  Since the child acts the same on the parents SIGTERM
+         * and a SIGHUP, we may as well use the same signal, because some user
+         * pthreads are stealing signals from us left and right.
+         */
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, active_daemons_limit,
+                               AP_MPM_PODX_RESTART);
+        }
+
+        ap_reclaim_child_processes(1,  /* Start with SIGTERM */
+                                   event_note_child_killed);
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00494)
+                     "SIGHUP received.  Attempting to restart");
+    }
+
+    active_daemons = 0;
+
+    return OK;
+}
+
+static void setup_slave_conn(conn_rec *c, void *csd) 
+{
+    event_conn_state_t *mcs;
+    event_conn_state_t *cs;
+    
+    mcs = ap_get_module_config(c->master->conn_config, &mpm_event_module);
+    
+    cs = apr_pcalloc(c->pool, sizeof(*cs));
+    cs->c = c;
+    cs->r = NULL;
+    cs->sc = mcs->sc;
+    cs->suspended = 0;
+    cs->p = c->pool;
+    cs->bucket_alloc = c->bucket_alloc;
+    cs->pfd = mcs->pfd;
+    cs->pub = mcs->pub;
+    cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
+    cs->pub.sense = CONN_SENSE_DEFAULT;
+    
+    c->cs = &(cs->pub);
+    ap_set_module_config(c->conn_config, &mpm_event_module, cs);
+}
+
+static int event_pre_connection(conn_rec *c, void *csd)
+{
+    if (c->master && (!c->cs || c->cs == c->master->cs)) {
+        setup_slave_conn(c, csd);
+    }
+    return OK;
+}
+
+static int event_protocol_switch(conn_rec *c, request_rec *r, server_rec *s,
+                                 const char *protocol)
+{
+    if (!r && s) {
+        /* connection based switching of protocol, set the correct server
+         * configuration, so that timeouts, keepalives and such are used
+         * for the server that the connection was switched on.
+         * Normally, we set this on post_read_request, but on a protocol
+         * other than http/1.1, this might never happen.
+         */
+        event_conn_state_t *cs;
+        
+        cs = ap_get_module_config(c->conn_config, &mpm_event_module);
+        cs->sc = ap_get_module_config(s->module_config, &mpm_event_module);
+    }
+    return DECLINED;
+}
+
+/* This really should be a post_config hook, but the error log is already
+ * redirected by that point, so we need to do this in the open_logs phase.
+ */
+static int event_open_logs(apr_pool_t * p, apr_pool_t * plog,
+                           apr_pool_t * ptemp, server_rec * s)
+{
+    int startup = 0;
+    int level_flags = 0;
+    int num_buckets = 0;
+    ap_listen_rec **listen_buckets;
+    apr_status_t rv;
+    int i;
+
+    pconf = p;
+
+    /* the reverse of pre_config, we want this only the first time around */
+    if (retained->mpm->module_loads == 1) {
+        startup = 1;
+        level_flags |= APLOG_STARTUP;
+    }
+
+    if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT | level_flags, 0,
+                     (startup ? NULL : s),
+                     "no listening sockets available, shutting down");
+        return !OK;
+    }
+
+    if (one_process) {
+        num_buckets = 1;
+    }
+    else if (retained->mpm->was_graceful) {
+        /* Preserve the number of buckets on graceful restarts. */
+        num_buckets = retained->mpm->num_buckets;
+    }
+    if ((rv = ap_duplicate_listeners(pconf, ap_server_conf,
+                                     &listen_buckets, &num_buckets))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+                     (startup ? NULL : s),
+                     "could not duplicate listeners");
+        return !OK;
+    }
+
+    all_buckets = apr_pcalloc(pconf, num_buckets * sizeof(*all_buckets));
+    for (i = 0; i < num_buckets; i++) {
+        if (!one_process && /* no POD in one_process mode */
+                (rv = ap_mpm_podx_open(pconf, &all_buckets[i].pod))) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+                         (startup ? NULL : s),
+                         "could not open pipe-of-death");
+            return !OK;
+        }
+        all_buckets[i].listeners = listen_buckets[i];
+    }
+
+    if (retained->mpm->max_buckets < num_buckets) {
+        int new_max, *new_ptr;
+        new_max = retained->mpm->max_buckets * 2;
+        if (new_max < num_buckets) {
+            new_max = num_buckets;
+        }
+        new_ptr = (int *)apr_palloc(ap_pglobal, new_max * sizeof(int));
+        memcpy(new_ptr, retained->idle_spawn_rate,
+               retained->mpm->num_buckets * sizeof(int));
+        retained->idle_spawn_rate = new_ptr;
+        retained->mpm->max_buckets = new_max;
+    }
+    if (retained->mpm->num_buckets < num_buckets) {
+        int rate_max = 1;
+        /* If new buckets are added, set their idle spawn rate to
+         * the highest so far, so that they get filled as quickly
+         * as the existing ones.
+         */
+        for (i = 0; i < retained->mpm->num_buckets; i++) {
+            if (rate_max < retained->idle_spawn_rate[i]) {
+                rate_max = retained->idle_spawn_rate[i];
+            }
+        }
+        for (/* up to date i */; i < num_buckets; i++) {
+            retained->idle_spawn_rate[i] = rate_max;
+        }
+    }
+    retained->mpm->num_buckets = num_buckets;
+
+    /* for skiplist */
+    srand((unsigned int)apr_time_now());
+    return OK;
+}
+
+static int event_pre_config(apr_pool_t * pconf, apr_pool_t * plog,
+                            apr_pool_t * ptemp)
+{
+    int no_detach, debug, foreground;
+    apr_status_t rv;
+    const char *userdata_key = "mpm_event_module";
+    int test_atomics = 0;
+
+    debug = ap_exists_config_define("DEBUG");
+
+    if (debug) {
+        foreground = one_process = 1;
+        no_detach = 0;
+    }
+    else {
+        one_process = ap_exists_config_define("ONE_PROCESS");
+        no_detach = ap_exists_config_define("NO_DETACH");
+        foreground = ap_exists_config_define("FOREGROUND");
+    }
+
+    retained = ap_retained_data_get(userdata_key);
+    if (!retained) {
+        retained = ap_retained_data_create(userdata_key, sizeof(*retained));
+        retained->mpm = ap_unixd_mpm_get_retained_data();
+        retained->max_daemons_limit = -1;
+        if (retained->mpm->module_loads) {
+            test_atomics = 1;
+        }
+    }
+    retained->mpm->mpm_state = AP_MPMQ_STARTING;
+    if (retained->mpm->baton != retained) {
+        retained->mpm->was_graceful = 0;
+        retained->mpm->baton = retained;
+    }
+    ++retained->mpm->module_loads;
+
+    /* test once for correct operation of fdqueue */
+    if (test_atomics || retained->mpm->module_loads == 2) {
+        static apr_uint32_t foo1, foo2;
+
+        apr_atomic_set32(&foo1, 100);
+        foo2 = apr_atomic_add32(&foo1, -10);
+        if (foo2 != 100 || foo1 != 90) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, 0, NULL, APLOGNO(02405)
+                         "atomics not working as expected - add32 of negative number");
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+    }
+
+    /* sigh, want this only the second time around */
+    if (retained->mpm->module_loads == 2) {
+        rv = apr_pollset_create(&event_pollset, 1, plog,
+                                APR_POLLSET_THREADSAFE | APR_POLLSET_NOCOPY);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00495)
+                         "Couldn't create a Thread Safe Pollset. "
+                         "Is it supported on your platform?"
+                         "Also check system or user limits!");
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+        apr_pollset_destroy(event_pollset);
+
+        if (!one_process && !foreground) {
+            /* before we detach, setup crash handlers to log to errorlog */
+            ap_fatal_signal_setup(ap_server_conf, pconf);
+            rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
+                                 : APR_PROC_DETACH_DAEMONIZE);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00496)
+                             "apr_proc_detach failed");
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+        }
+    }
+
+    parent_pid = ap_my_pid = getpid();
+
+    ap_listen_pre_config();
+    ap_daemons_to_start = DEFAULT_START_DAEMON;
+    min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
+    max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
+    server_limit = DEFAULT_SERVER_LIMIT;
+    thread_limit = DEFAULT_THREAD_LIMIT;
+    active_daemons_limit = server_limit;
+    threads_per_child = DEFAULT_THREADS_PER_CHILD;
+    max_workers = active_daemons_limit * threads_per_child;
+    defer_linger_chain = NULL;
+    had_healthy_child = 0;
+    ap_extended_status = 0;
+
+    event_pollset = NULL;
+    worker_queue_info = NULL;
+    listener_os_thread = NULL;
+    listensocks_disabled = 0;
+
+    return OK;
+}
+
+static int event_post_config(apr_pool_t *pconf, apr_pool_t *plog,
+                             apr_pool_t *ptemp, server_rec *s)
+{
+    struct {
+        struct timeout_queue *tail, *q;
+        apr_hash_t *hash;
+    } wc, ka;
+
+    /* Not needed in pre_config stage */
+    if (ap_state_query(AP_SQ_MAIN_STATE) == AP_SQ_MS_CREATE_PRE_CONFIG) {
+        return OK;
+    }
+
+    wc.tail = ka.tail = NULL;
+    wc.hash = apr_hash_make(ptemp);
+    ka.hash = apr_hash_make(ptemp);
+
+    linger_q = TO_QUEUE_MAKE(pconf, apr_time_from_sec(MAX_SECS_TO_LINGER),
+                             NULL);
+    short_linger_q = TO_QUEUE_MAKE(pconf, apr_time_from_sec(SECONDS_TO_LINGER),
+                                   NULL);
+
+    for (; s; s = s->next) {
+        event_srv_cfg *sc = apr_pcalloc(pconf, sizeof *sc);
+
+        ap_set_module_config(s->module_config, &mpm_event_module, sc);
+        if (!wc.tail) {
+            /* The main server uses the global queues */
+            wc.q = TO_QUEUE_MAKE(pconf, s->timeout, NULL);
+            apr_hash_set(wc.hash, &s->timeout, sizeof s->timeout, wc.q);
+            wc.tail = write_completion_q = wc.q;
+
+            ka.q = TO_QUEUE_MAKE(pconf, s->keep_alive_timeout, NULL);
+            apr_hash_set(ka.hash, &s->keep_alive_timeout,
+                         sizeof s->keep_alive_timeout, ka.q);
+            ka.tail = keepalive_q = ka.q;
+        }
+        else {
+            /* The vhosts use any existing queue with the same timeout,
+             * or their own queue(s) if there isn't */
+            wc.q = apr_hash_get(wc.hash, &s->timeout, sizeof s->timeout);
+            if (!wc.q) {
+                wc.q = TO_QUEUE_MAKE(pconf, s->timeout, wc.tail);
+                apr_hash_set(wc.hash, &s->timeout, sizeof s->timeout, wc.q);
+                wc.tail = wc.tail->next = wc.q;
+            }
+
+            ka.q = apr_hash_get(ka.hash, &s->keep_alive_timeout,
+                                sizeof s->keep_alive_timeout);
+            if (!ka.q) {
+                ka.q = TO_QUEUE_MAKE(pconf, s->keep_alive_timeout, ka.tail);
+                apr_hash_set(ka.hash, &s->keep_alive_timeout,
+                             sizeof s->keep_alive_timeout, ka.q);
+                ka.tail = ka.tail->next = ka.q;
+            }
+        }
+        sc->wc_q = wc.q;
+        sc->ka_q = ka.q;
+    }
+
+    return OK;
+}
+
+static int event_check_config(apr_pool_t *p, apr_pool_t *plog,
+                              apr_pool_t *ptemp, server_rec *s)
+{
+    int startup = 0;
+
+    /* the reverse of pre_config, we want this only the first time around */
+    if (retained->mpm->module_loads == 1) {
+        startup = 1;
+    }
+
+    if (server_limit > MAX_SERVER_LIMIT) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00497)
+                         "WARNING: ServerLimit of %d exceeds compile-time "
+                         "limit of %d servers, decreasing to %d.",
+                         server_limit, MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00498)
+                         "ServerLimit of %d exceeds compile-time limit "
+                         "of %d, decreasing to match",
+                         server_limit, MAX_SERVER_LIMIT);
+        }
+        server_limit = MAX_SERVER_LIMIT;
+    }
+    else if (server_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00499)
+                         "WARNING: ServerLimit of %d not allowed, "
+                         "increasing to 1.", server_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00500)
+                         "ServerLimit of %d not allowed, increasing to 1",
+                         server_limit);
+        }
+        server_limit = 1;
+    }
+
+    /* you cannot change ServerLimit across a restart; ignore
+     * any such attempts
+     */
+    if (!retained->first_server_limit) {
+        retained->first_server_limit = server_limit;
+    }
+    else if (server_limit != retained->first_server_limit) {
+        /* don't need a startup console version here */
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00501)
+                     "changing ServerLimit to %d from original value of %d "
+                     "not allowed during restart",
+                     server_limit, retained->first_server_limit);
+        server_limit = retained->first_server_limit;
+    }
+
+    if (thread_limit > MAX_THREAD_LIMIT) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00502)
+                         "WARNING: ThreadLimit of %d exceeds compile-time "
+                         "limit of %d threads, decreasing to %d.",
+                         thread_limit, MAX_THREAD_LIMIT, MAX_THREAD_LIMIT);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00503)
+                         "ThreadLimit of %d exceeds compile-time limit "
+                         "of %d, decreasing to match",
+                         thread_limit, MAX_THREAD_LIMIT);
+        }
+        thread_limit = MAX_THREAD_LIMIT;
+    }
+    else if (thread_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00504)
+                         "WARNING: ThreadLimit of %d not allowed, "
+                         "increasing to 1.", thread_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00505)
+                         "ThreadLimit of %d not allowed, increasing to 1",
+                         thread_limit);
+        }
+        thread_limit = 1;
+    }
+
+    /* you cannot change ThreadLimit across a restart; ignore
+     * any such attempts
+     */
+    if (!retained->first_thread_limit) {
+        retained->first_thread_limit = thread_limit;
+    }
+    else if (thread_limit != retained->first_thread_limit) {
+        /* don't need a startup console version here */
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00506)
+                     "changing ThreadLimit to %d from original value of %d "
+                     "not allowed during restart",
+                     thread_limit, retained->first_thread_limit);
+        thread_limit = retained->first_thread_limit;
+    }
+
+    if (threads_per_child > thread_limit) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00507)
+                         "WARNING: ThreadsPerChild of %d exceeds ThreadLimit "
+                         "of %d threads, decreasing to %d. "
+                         "To increase, please see the ThreadLimit directive.",
+                         threads_per_child, thread_limit, thread_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00508)
+                         "ThreadsPerChild of %d exceeds ThreadLimit "
+                         "of %d, decreasing to match",
+                         threads_per_child, thread_limit);
+        }
+        threads_per_child = thread_limit;
+    }
+    else if (threads_per_child < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00509)
+                         "WARNING: ThreadsPerChild of %d not allowed, "
+                         "increasing to 1.", threads_per_child);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00510)
+                         "ThreadsPerChild of %d not allowed, increasing to 1",
+                         threads_per_child);
+        }
+        threads_per_child = 1;
+    }
+
+    if (max_workers < threads_per_child) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00511)
+                         "WARNING: MaxRequestWorkers of %d is less than "
+                         "ThreadsPerChild of %d, increasing to %d. "
+                         "MaxRequestWorkers must be at least as large "
+                         "as the number of threads in a single server.",
+                         max_workers, threads_per_child, threads_per_child);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00512)
+                         "MaxRequestWorkers of %d is less than ThreadsPerChild "
+                         "of %d, increasing to match",
+                         max_workers, threads_per_child);
+        }
+        max_workers = threads_per_child;
+    }
+
+    active_daemons_limit = max_workers / threads_per_child;
+
+    if (max_workers % threads_per_child) {
+        int tmp_max_workers = active_daemons_limit * threads_per_child;
+
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00513)
+                         "WARNING: MaxRequestWorkers of %d is not an integer "
+                         "multiple of ThreadsPerChild of %d, decreasing to nearest "
+                         "multiple %d, for a maximum of %d servers.",
+                         max_workers, threads_per_child, tmp_max_workers,
+                         active_daemons_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00514)
+                         "MaxRequestWorkers of %d is not an integer multiple "
+                         "of ThreadsPerChild of %d, decreasing to nearest "
+                         "multiple %d", max_workers, threads_per_child,
+                         tmp_max_workers);
+        }
+        max_workers = tmp_max_workers;
+    }
+
+    if (active_daemons_limit > server_limit) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00515)
+                         "WARNING: MaxRequestWorkers of %d would require %d servers "
+                         "and would exceed ServerLimit of %d, decreasing to %d. "
+                         "To increase, please see the ServerLimit directive.",
+                         max_workers, active_daemons_limit, server_limit,
+                         server_limit * threads_per_child);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00516)
+                         "MaxRequestWorkers of %d would require %d servers and "
+                         "exceed ServerLimit of %d, decreasing to %d",
+                         max_workers, active_daemons_limit, server_limit,
+                         server_limit * threads_per_child);
+        }
+        active_daemons_limit = server_limit;
+    }
+
+    /* ap_daemons_to_start > active_daemons_limit checked in ap_mpm_run() */
+    if (ap_daemons_to_start < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00517)
+                         "WARNING: StartServers of %d not allowed, "
+                         "increasing to 1.", ap_daemons_to_start);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00518)
+                         "StartServers of %d not allowed, increasing to 1",
+                         ap_daemons_to_start);
+        }
+        ap_daemons_to_start = 1;
+    }
+
+    if (min_spare_threads < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00519)
+                         "WARNING: MinSpareThreads of %d not allowed, "
+                         "increasing to 1 to avoid almost certain server "
+                         "failure. Please read the documentation.",
+                         min_spare_threads);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00520)
+                         "MinSpareThreads of %d not allowed, increasing to 1",
+                         min_spare_threads);
+        }
+        min_spare_threads = 1;
+    }
+
+    /* max_spare_threads < min_spare_threads + threads_per_child
+     * checked in ap_mpm_run()
+     */
+
+    return OK;
+}
+
+static void event_hooks(apr_pool_t * p)
+{
+    /* Our open_logs hook function must run before the core's, or stderr
+     * will be redirected to a file, and the messages won't print to the
+     * console.
+     */
+    static const char *const aszSucc[] = { "core.c", NULL };
+    one_process = 0;
+
+    ap_hook_open_logs(event_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
+    /* we need to set the MPM state before other pre-config hooks use MPM query
+     * to retrieve it, so register as REALLY_FIRST
+     */
+    ap_hook_pre_config(event_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
+    ap_hook_post_config(event_post_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_check_config(event_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm(event_run, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_query(event_query, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_register_timed_callback(event_register_timed_callback, NULL, NULL,
+                                        APR_HOOK_MIDDLE);
+    ap_hook_pre_read_request(event_pre_read_request, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_post_read_request(event_post_read_request, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_get_name(event_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+
+    ap_hook_pre_connection(event_pre_connection, NULL, NULL, APR_HOOK_REALLY_FIRST);
+    ap_hook_protocol_switch(event_protocol_switch, NULL, NULL, APR_HOOK_REALLY_FIRST);
+}
+
+static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy,
+                                        const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_daemons_to_start = atoi(arg);
+    return NULL;
+}
+
+static const char *set_min_spare_threads(cmd_parms * cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    min_spare_threads = atoi(arg);
+    return NULL;
+}
+
+static const char *set_max_spare_threads(cmd_parms * cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    max_spare_threads = atoi(arg);
+    return NULL;
+}
+
+static const char *set_max_workers(cmd_parms * cmd, void *dummy,
+                                   const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+    if (!strcasecmp(cmd->cmd->name, "MaxClients")) {
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00521)
+                     "MaxClients is deprecated, use MaxRequestWorkers "
+                     "instead.");
+    }
+    max_workers = atoi(arg);
+    return NULL;
+}
+
+static const char *set_threads_per_child(cmd_parms * cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    threads_per_child = atoi(arg);
+    return NULL;
+}
+static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    server_limit = atoi(arg);
+    return NULL;
+}
+
+static const char *set_thread_limit(cmd_parms * cmd, void *dummy,
+                                    const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    thread_limit = atoi(arg);
+    return NULL;
+}
+
+static const char *set_worker_factor(cmd_parms * cmd, void *dummy,
+                                     const char *arg)
+{
+    double val;
+    char *endptr;
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    val = strtod(arg, &endptr);
+    if (*endptr)
+        return "error parsing value";
+
+    if (val <= 0)
+        return "AsyncRequestWorkerFactor argument must be a positive number";
+
+    worker_factor = val * WORKER_FACTOR_SCALE;
+    if (worker_factor < WORKER_FACTOR_SCALE) {
+        worker_factor = WORKER_FACTOR_SCALE;
+    }
+    return NULL;
+}
+
+
+static const command_rec event_cmds[] = {
+    LISTEN_COMMANDS,
+    AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
+                  "Number of child processes launched at server startup"),
+    AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
+                  "Maximum number of child processes for this run of Apache"),
+    AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
+                  "Minimum number of idle threads, to handle request spikes"),
+    AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
+                  "Maximum number of idle threads"),
+    AP_INIT_TAKE1("MaxClients", set_max_workers, NULL, RSRC_CONF,
+                  "Deprecated name of MaxRequestWorkers"),
+    AP_INIT_TAKE1("MaxRequestWorkers", set_max_workers, NULL, RSRC_CONF,
+                  "Maximum number of threads alive at the same time"),
+    AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
+                  "Number of threads each child creates"),
+    AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
+                  "Maximum number of worker threads per child process for this "
+                  "run of Apache - Upper limit for ThreadsPerChild"),
+    AP_INIT_TAKE1("AsyncRequestWorkerFactor", set_worker_factor, NULL, RSRC_CONF,
+                  "How many additional connects will be accepted per idle "
+                  "worker thread"),
+    AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
+    {NULL}
+};
+
+AP_DECLARE_MODULE(mpm_event) = {
+    MPM20_MODULE_STUFF,
+    NULL,                       /* hook to run before apache parses args */
+    NULL,                       /* create per-directory config structure */
+    NULL,                       /* merge per-directory config structures */
+    NULL,                       /* create per-server config structure */
+    NULL,                       /* merge per-server config structures */
+    event_cmds,                 /* command apr_table_t */
+    event_hooks                 /* register_hooks */
+};
diff --git a/server/mpm/event/mpm_default.h b/server/mpm/event/mpm_default.h
new file mode 100644
index 0000000..214caa0
--- /dev/null
+++ b/server/mpm/event/mpm_default.h
@@ -0,0 +1,56 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+/**
+ * @file  event/mpm_default.h
+ * @brief Event MPM defaults
+ *
+ * @defgroup APACHE_MPM_EVENT Event MPM
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Number of servers to spawn off by default --- also, if fewer than
+ * this free when the caretaker checks, it will spawn more.
+ */
+#ifndef DEFAULT_START_DAEMON
+#define DEFAULT_START_DAEMON 3
+#endif
+
+/* Maximum number of *free* server processes --- more than this, and
+ * they will die off.
+ */
+
+#ifndef DEFAULT_MAX_FREE_DAEMON
+#define DEFAULT_MAX_FREE_DAEMON 10
+#endif
+
+/* Minimum --- fewer than this, and more will be created */
+
+#ifndef DEFAULT_MIN_FREE_DAEMON
+#define DEFAULT_MIN_FREE_DAEMON 3
+#endif
+
+#ifndef DEFAULT_THREADS_PER_CHILD
+#define DEFAULT_THREADS_PER_CHILD 25
+#endif
+
+#endif /* AP_MPM_DEFAULT_H */
+/** @} */
diff --git a/server/mpm/mpmt_os2/Makefile.in b/server/mpm/mpmt_os2/Makefile.in
new file mode 100644
index 0000000..f34af9c
--- /dev/null
+++ b/server/mpm/mpmt_os2/Makefile.in
@@ -0,0 +1 @@
+include $(top_srcdir)/build/special.mk
diff --git a/server/mpm/mpmt_os2/config.m4 b/server/mpm/mpmt_os2/config.m4
new file mode 100644
index 0000000..9a29903
--- /dev/null
+++ b/server/mpm/mpmt_os2/config.m4
@@ -0,0 +1,10 @@
+AC_MSG_CHECKING(if mpmt_os2 MPM supports this platform)
+case $host in
+    *os2-emx*)
+        AC_MSG_RESULT(yes)
+        APACHE_MPM_SUPPORTED(mpmt_os2, no, yes)
+        ;;
+    *)
+        AC_MSG_RESULT(no)
+        ;;
+esac
diff --git a/server/mpm/mpmt_os2/config5.m4 b/server/mpm/mpmt_os2/config5.m4
new file mode 100644
index 0000000..c74f145
--- /dev/null
+++ b/server/mpm/mpmt_os2/config5.m4
@@ -0,0 +1,3 @@
+APACHE_MPM_MODULE(mpmt_os2, $enable_mpm_mpmt_os2, mpmt_os2.lo mpmt_os2_child.lo,[
+    APR_ADDTO(CFLAGS,-Zmt)
+])
diff --git a/server/mpm/mpmt_os2/mpm_default.h b/server/mpm/mpmt_os2/mpm_default.h
new file mode 100644
index 0000000..36ba944
--- /dev/null
+++ b/server/mpm/mpmt_os2/mpm_default.h
@@ -0,0 +1,57 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file  mpmt_os2/mpm_default.h
+ * @brief os2 MPM defaults
+ *
+ * @defgroup APACHE_MPM_OS2 OS/2 MPM
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Number of servers processes to spawn off by default
+ */
+#ifndef DEFAULT_START_DAEMON
+#define DEFAULT_START_DAEMON 2
+#endif
+
+/* Maximum number of *free* server threads --- more than this, and
+ * they will die off.
+ */
+
+#ifndef DEFAULT_MAX_SPARE_THREAD
+#define DEFAULT_MAX_SPARE_THREAD 10
+#endif
+
+/* Minimum --- fewer than this, and more will be created */
+
+#ifndef DEFAULT_MIN_SPARE_THREAD
+#define DEFAULT_MIN_SPARE_THREAD 5
+#endif
+
+/*
+ * Interval, in microseconds, between scoreboard maintenance.
+ */
+#ifndef SCOREBOARD_MAINTENANCE_INTERVAL
+#define SCOREBOARD_MAINTENANCE_INTERVAL 1000000
+#endif
+
+#endif /* AP_MPM_DEFAULT_H */
+/** @} */
diff --git a/server/mpm/mpmt_os2/mpmt_os2.c b/server/mpm/mpmt_os2/mpmt_os2.c
new file mode 100644
index 0000000..22bf5e7
--- /dev/null
+++ b/server/mpm/mpmt_os2/mpmt_os2.c
@@ -0,0 +1,614 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Multi-process, multi-threaded MPM for OS/2
+ *
+ * Server consists of
+ * - a main, parent process
+ * - a small, static number of child processes
+ *
+ * The parent process's job is to manage the child processes. This involves
+ * spawning children as required to ensure there are always ap_daemons_to_start
+ * processes accepting connections.
+ *
+ * Each child process consists of a pool of worker threads and a
+ * main thread that accepts connections & passes them to the workers via
+ * a work queue. The worker thread pool is dynamic, managed by a maintanence
+ * thread so that the number of idle threads is kept between
+ * min_spare_threads & max_spare_threads.
+ *
+ */
+
+/*
+ Todo list
+ - Enforce MaxRequestWorkers somehow
+*/
+#define INCL_NOPMAPI
+#define INCL_DOS
+#define INCL_DOSERRORS
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "mpm_default.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h"
+#include "http_core.h"  /* for get_remote_host */
+#include "http_connection.h"
+#include "ap_mpm.h"
+#include "ap_listen.h"
+#include "apr_portable.h"
+#include "mpm_common.h"
+#include "scoreboard.h"
+#include "apr_strings.h"
+#include <os2.h>
+#include <process.h>
+
+/* We don't need many processes,
+ * they're only for redundancy in the event of a crash
+ */
+#define HARD_SERVER_LIMIT 10
+
+/* Limit on the total number of threads per process
+ */
+#ifndef HARD_THREAD_LIMIT
+#define HARD_THREAD_LIMIT 256
+#endif
+
+server_rec *ap_server_conf;
+static apr_pool_t *pconf = NULL;  /* Pool for config stuff */
+
+/* Config globals */
+static int one_process = 0;
+static int ap_daemons_to_start = 0;
+static int ap_thread_limit = 0;
+int ap_min_spare_threads = 0;
+int ap_max_spare_threads = 0;
+
+/* Keep track of a few interesting statistics */
+int ap_max_daemons_limit = -1;
+
+/* volatile just in case */
+static int volatile shutdown_pending;
+static int volatile restart_pending;
+static int volatile is_graceful = 0;
+ap_generation_t volatile ap_my_generation=0; /* Used by the scoreboard */
+static int is_parent_process=TRUE;
+HMTX ap_mpm_accept_mutex = 0;
+
+/* An array of these is stored in a shared memory area for passing
+ * sockets from the parent to child processes
+ */
+typedef struct {
+    struct sockaddr_in name;
+    apr_os_sock_t listen_fd;
+} listen_socket_t;
+
+typedef struct {
+    HMTX accept_mutex;
+    listen_socket_t listeners[1];
+} parent_info_t;
+
+static int master_main();
+static void spawn_child(int slot);
+void ap_mpm_child_main(apr_pool_t *pconf);
+static void set_signals();
+
+
+static int mpmt_os2_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s )
+{
+    char *listener_shm_name;
+    parent_info_t *parent_info;
+    ULONG rc;
+    pconf = _pconf;
+    ap_server_conf = s;
+    restart_pending = 0;
+
+    DosSetMaxFH(ap_thread_limit * 2);
+    listener_shm_name = apr_psprintf(pconf, "/sharemem/httpd/parent_info.%d", getppid());
+    rc = DosGetNamedSharedMem((PPVOID)&parent_info, listener_shm_name, PAG_READ);
+    is_parent_process = rc != 0;
+    ap_scoreboard_fname = apr_psprintf(pconf, "/sharemem/httpd/scoreboard.%d", is_parent_process ? getpid() : getppid());
+
+    if (rc == 0) {
+        /* Child process */
+        ap_listen_rec *lr;
+        int num_listeners = 0;
+
+        ap_mpm_accept_mutex = parent_info->accept_mutex;
+
+        /* Set up a default listener if necessary */
+        if (ap_listeners == NULL) {
+            ap_listen_rec *lr = apr_pcalloc(s->process->pool, sizeof(ap_listen_rec));
+            ap_listeners = lr;
+            apr_sockaddr_info_get(&lr->bind_addr, "0.0.0.0", APR_UNSPEC,
+                                  DEFAULT_HTTP_PORT, 0, s->process->pool);
+            apr_socket_create(&lr->sd, lr->bind_addr->family,
+                              SOCK_STREAM, 0, s->process->pool);
+        }
+
+        for (lr = ap_listeners; lr; lr = lr->next) {
+            apr_sockaddr_t *sa;
+            apr_os_sock_put(&lr->sd, &parent_info->listeners[num_listeners].listen_fd, pconf);
+            apr_socket_addr_get(&sa, APR_LOCAL, lr->sd);
+            num_listeners++;
+        }
+
+        DosFreeMem(parent_info);
+
+        /* Do the work */
+        ap_mpm_child_main(pconf);
+
+        /* Outta here */
+        return DONE;
+    }
+    else {
+        /* Parent process */
+        int rc;
+        is_parent_process = TRUE;
+
+        if (ap_setup_listeners(ap_server_conf) < 1) {
+            ap_log_error(APLOG_MARK, APLOG_ALERT, 0, s, APLOGNO(00200)
+                         "no listening sockets available, shutting down");
+            return !OK;
+        }
+
+        ap_log_pid(pconf, ap_pid_fname);
+
+        rc = master_main();
+        ++ap_my_generation;
+        ap_scoreboard_image->global->running_generation = ap_my_generation;
+
+        if (rc != OK) {
+            ap_remove_pid(pconf, ap_pid_fname);
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00201)
+                         "caught %s, shutting down",
+                         (rc == DONE) ? "SIGTERM" : "error");
+            return rc;
+        }
+    }  /* Parent process */
+
+    return OK; /* Restart */
+}
+
+
+
+/* Main processing of the parent process
+ * returns TRUE if restarting
+ */
+static int master_main()
+{
+    server_rec *s = ap_server_conf;
+    ap_listen_rec *lr;
+    parent_info_t *parent_info;
+    char *listener_shm_name;
+    int listener_num, num_listeners, slot;
+    ULONG rc;
+
+    printf("%s \n", ap_get_server_description());
+    set_signals();
+
+    if (ap_setup_listeners(ap_server_conf) < 1) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, 0, s, APLOGNO(00202)
+                     "no listening sockets available, shutting down");
+        return !OK;
+    }
+
+    /* Allocate a shared memory block for the array of listeners */
+    for (num_listeners = 0, lr = ap_listeners; lr; lr = lr->next) {
+        num_listeners++;
+    }
+
+    listener_shm_name = apr_psprintf(pconf, "/sharemem/httpd/parent_info.%d", getpid());
+    rc = DosAllocSharedMem((PPVOID)&parent_info, listener_shm_name,
+                           sizeof(parent_info_t) + num_listeners * sizeof(listen_socket_t),
+                           PAG_READ|PAG_WRITE|PAG_COMMIT);
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, APR_FROM_OS_ERROR(rc), s, APLOGNO(00203)
+                     "failure allocating shared memory, shutting down");
+        return !OK;
+    }
+
+    /* Store the listener sockets in the shared memory area for our children to see */
+    for (listener_num = 0, lr = ap_listeners; lr; lr = lr->next, listener_num++) {
+        apr_os_sock_get(&parent_info->listeners[listener_num].listen_fd, lr->sd);
+    }
+
+    /* Create mutex to prevent multiple child processes from detecting
+     * a connection with apr_poll()
+     */
+
+    rc = DosCreateMutexSem(NULL, &ap_mpm_accept_mutex, DC_SEM_SHARED, FALSE);
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, APR_FROM_OS_ERROR(rc), s, APLOGNO(00204)
+                     "failure creating accept mutex, shutting down");
+        return !OK;
+    }
+
+    parent_info->accept_mutex = ap_mpm_accept_mutex;
+
+    /* Allocate shared memory for scoreboard */
+    if (ap_scoreboard_image == NULL) {
+        void *sb_mem;
+        rc = DosAllocSharedMem(&sb_mem, ap_scoreboard_fname,
+                               ap_calc_scoreboard_size(),
+                               PAG_COMMIT|PAG_READ|PAG_WRITE);
+
+        if (rc) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf, APLOGNO(00205)
+                         "unable to allocate shared memory for scoreboard , exiting");
+            return !OK;
+        }
+
+        ap_init_scoreboard(sb_mem);
+    }
+
+    ap_scoreboard_image->global->restart_time = apr_time_now();
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00206)
+                "%s configured -- resuming normal operations",
+                ap_get_server_description());
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00207)
+                "Server built: %s", ap_get_server_built());
+    if (one_process) {
+        ap_scoreboard_image->parent[0].pid = getpid();
+        ap_mpm_child_main(pconf);
+        return DONE;
+    }
+
+    while (!restart_pending && !shutdown_pending) {
+        RESULTCODES proc_rc;
+        PID child_pid;
+        int active_children = 0;
+
+        /* Count number of active children */
+        for (slot=0; slot < HARD_SERVER_LIMIT; slot++) {
+            active_children += ap_scoreboard_image->parent[slot].pid != 0 &&
+                !ap_scoreboard_image->parent[slot].quiescing;
+        }
+
+        /* Spawn children if needed */
+        for (slot=0; slot < HARD_SERVER_LIMIT && active_children < ap_daemons_to_start; slot++) {
+            if (ap_scoreboard_image->parent[slot].pid == 0) {
+                spawn_child(slot);
+                active_children++;
+            }
+        }
+
+        rc = DosWaitChild(DCWA_PROCESSTREE, DCWW_NOWAIT, &proc_rc, &child_pid, 0);
+
+        if (rc == 0) {
+            /* A child has terminated, remove its scoreboard entry & terminate if necessary */
+            for (slot=0; ap_scoreboard_image->parent[slot].pid != child_pid && slot < HARD_SERVER_LIMIT; slot++);
+
+            if (slot < HARD_SERVER_LIMIT) {
+                ap_scoreboard_image->parent[slot].pid = 0;
+                ap_scoreboard_image->parent[slot].quiescing = 0;
+
+                if (proc_rc.codeTerminate == TC_EXIT) {
+                    /* Child terminated normally, check its exit code and
+                     * terminate server if child indicates a fatal error
+                     */
+                    if (proc_rc.codeResult == APEXIT_CHILDFATAL)
+                        break;
+                }
+            }
+        } else if (rc == ERROR_CHILD_NOT_COMPLETE) {
+            /* No child exited, lets sleep for a while.... */
+            apr_sleep(SCOREBOARD_MAINTENANCE_INTERVAL);
+        }
+    }
+
+    /* Signal children to shut down, either gracefully or immediately */
+    for (slot=0; slot<HARD_SERVER_LIMIT; slot++) {
+      kill(ap_scoreboard_image->parent[slot].pid, is_graceful ? SIGHUP : SIGTERM);
+    }
+
+    DosFreeMem(parent_info);
+    return restart_pending ? OK : DONE;
+}
+
+
+
+static void spawn_child(int slot)
+{
+    PPIB ppib;
+    PTIB ptib;
+    char fail_module[100];
+    char progname[CCHMAXPATH];
+    RESULTCODES proc_rc;
+    ULONG rc;
+
+    ap_scoreboard_image->parent[slot].generation = ap_my_generation;
+    DosGetInfoBlocks(&ptib, &ppib);
+    DosQueryModuleName(ppib->pib_hmte, sizeof(progname), progname);
+    rc = DosExecPgm(fail_module, sizeof(fail_module), EXEC_ASYNCRESULT,
+                    ppib->pib_pchcmd, NULL, &proc_rc, progname);
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf, APLOGNO(00208)
+                     "error spawning child, slot %d", slot);
+    }
+
+    if (ap_max_daemons_limit < slot) {
+        ap_max_daemons_limit = slot;
+    }
+
+    ap_scoreboard_image->parent[slot].pid = proc_rc.codeTerminate;
+}
+
+
+
+/* Signal handling routines */
+
+static void sig_term(int sig)
+{
+    shutdown_pending = 1;
+    signal(SIGTERM, SIG_DFL);
+}
+
+
+
+static void sig_restart(int sig)
+{
+    if (sig == SIGUSR1) {
+        is_graceful = 1;
+    }
+
+    restart_pending = 1;
+}
+
+
+
+static void set_signals()
+{
+    struct sigaction sa;
+
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sa.sa_handler = sig_term;
+
+    if (sigaction(SIGTERM, &sa, NULL) < 0)
+        ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00209) "sigaction(SIGTERM)");
+
+    if (sigaction(SIGINT, &sa, NULL) < 0)
+        ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00210) "sigaction(SIGINT)");
+
+    sa.sa_handler = sig_restart;
+
+    if (sigaction(SIGHUP, &sa, NULL) < 0)
+        ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00211) "sigaction(SIGHUP)");
+    if (sigaction(SIGUSR1, &sa, NULL) < 0)
+        ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00212) "sigaction(SIGUSR1)");
+}
+
+
+
+/* Enquiry functions used get MPM status info */
+
+static apr_status_t mpmt_os2_query(int query_code, int *result, apr_status_t *rv)
+{
+    *rv = APR_SUCCESS;
+
+    switch (query_code) {
+        case AP_MPMQ_MAX_DAEMON_USED:
+            *result = ap_max_daemons_limit;
+            break;
+
+        case AP_MPMQ_IS_THREADED:
+            *result = AP_MPMQ_DYNAMIC;
+            break;
+
+        case AP_MPMQ_IS_FORKED:
+            *result = AP_MPMQ_NOT_SUPPORTED;
+            break;
+
+        case AP_MPMQ_HARD_LIMIT_DAEMONS:
+            *result = HARD_SERVER_LIMIT;
+            break;
+
+        case AP_MPMQ_HARD_LIMIT_THREADS:
+            *result = HARD_THREAD_LIMIT;
+            break;
+
+        case AP_MPMQ_MIN_SPARE_DAEMONS:
+            *result = 0;
+            break;
+
+        case AP_MPMQ_MAX_SPARE_DAEMONS:
+            *result = 0;
+            break;
+
+        case AP_MPMQ_MAX_REQUESTS_DAEMON:
+            *result = ap_max_requests_per_child;
+            break;
+
+        case AP_MPMQ_GENERATION:
+            *result = ap_my_generation;
+            break;
+
+        default:
+            *rv = APR_ENOTIMPL;
+            break;
+    }
+
+    return OK;
+}
+
+
+
+
+static const char *mpmt_os2_get_name(void)
+{
+    return "mpmt_os2";
+}
+
+
+
+
+/* Configuration handling stuff */
+
+static int mpmt_os2_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+    one_process = ap_exists_config_define("ONE_PROCESS") ||
+                  ap_exists_config_define("DEBUG");
+    is_graceful = 0;
+    ap_listen_pre_config();
+    ap_daemons_to_start = DEFAULT_START_DAEMON;
+    ap_thread_limit = HARD_THREAD_LIMIT;
+    ap_extended_status = 0;
+    ap_min_spare_threads = DEFAULT_MIN_SPARE_THREAD;
+    ap_max_spare_threads = DEFAULT_MAX_SPARE_THREAD;
+    ap_sys_privileges_handlers(1);
+
+    return OK;
+}
+
+
+
+static int mpmt_os2_check_config(apr_pool_t *p, apr_pool_t *plog,
+                                 apr_pool_t *ptemp, server_rec *s)
+{
+    static int restart_num = 0;
+    int startup = 0;
+
+    /* we want this only the first time around */
+    if (restart_num++ == 0) {
+        startup = 1;
+    }
+
+    if (ap_daemons_to_start < 0) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00213)
+                         "WARNING: StartServers of %d not allowed, "
+                         "increasing to 1.", ap_daemons_to_start);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00214)
+                         "StartServers of %d not allowed, increasing to 1",
+                         ap_daemons_to_start);
+        }
+        ap_daemons_to_start = 1;
+    }
+
+    if (ap_min_spare_threads < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00215)
+                         "WARNING: MinSpareThreads of %d not allowed, "
+                         "increasing to 1 to avoid almost certain server failure. "
+                         "Please read the documentation.", ap_min_spare_threads);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00216)
+                         "MinSpareThreads of %d not allowed, increasing to 1",
+                         ap_min_spare_threads);
+        }
+        ap_min_spare_threads = 1;
+    }
+
+    return OK;
+}
+
+
+
+static void mpmt_os2_hooks(apr_pool_t *p)
+{
+    ap_hook_pre_config(mpmt_os2_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_check_config(mpmt_os2_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm(mpmt_os2_run, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_query(mpmt_os2_query, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_get_name(mpmt_os2_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+
+
+static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_daemons_to_start = atoi(arg);
+    return NULL;
+}
+
+
+
+static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_min_spare_threads = atoi(arg);
+    return NULL;
+}
+
+
+
+static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_max_spare_threads = atoi(arg);
+    return NULL;
+}
+
+
+
+static const char *ignore_cmd(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    return NULL;
+}
+
+
+
+static const command_rec mpmt_os2_cmds[] = {
+LISTEN_COMMANDS,
+AP_INIT_TAKE1( "StartServers", set_daemons_to_start, NULL, RSRC_CONF,
+  "Number of child processes launched at server startup" ),
+AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
+  "Minimum number of idle children, to handle request spikes"),
+AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
+  "Maximum number of idle children"),
+AP_INIT_TAKE1("User", ignore_cmd, NULL, RSRC_CONF,
+  "Not applicable on this platform"),
+AP_INIT_TAKE1("Group", ignore_cmd, NULL, RSRC_CONF,
+  "Not applicable on this platform"),
+AP_INIT_TAKE1("ScoreBoardFile", ignore_cmd, NULL, RSRC_CONF, \
+  "Not applicable on this platform"),
+{ NULL }
+};
+
+AP_DECLARE_MODULE(mpm_mpmt_os2) = {
+    MPM20_MODULE_STUFF,
+    NULL,            /* hook to run before apache parses args */
+    NULL,            /* create per-directory config structure */
+    NULL,            /* merge per-directory config structures */
+    NULL,            /* create per-server config structure */
+    NULL,            /* merge per-server config structures */
+    mpmt_os2_cmds,   /* command apr_table_t */
+    mpmt_os2_hooks,  /* register_hooks */
+};
diff --git a/server/mpm/mpmt_os2/mpmt_os2_child.c b/server/mpm/mpmt_os2/mpmt_os2_child.c
new file mode 100644
index 0000000..bb7e136
--- /dev/null
+++ b/server/mpm/mpmt_os2/mpmt_os2_child.c
@@ -0,0 +1,489 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define INCL_NOPMAPI
+#define INCL_DOS
+#define INCL_DOSERRORS
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "mpm_default.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h"
+#include "http_core.h"  /* for get_remote_host */
+#include "http_connection.h"
+#include "scoreboard.h"
+#include "ap_mpm.h"
+#include "ap_listen.h"
+#include "apr_portable.h"
+#include "apr_poll.h"
+#include "mpm_common.h"
+#include "apr_strings.h"
+#include <os2.h>
+#include <process.h>
+
+APLOG_USE_MODULE(mpm_mpmt_os2);
+
+/* XXXXXX move these to header file private to this MPM */
+
+/* We don't need many processes,
+ * they're only for redundancy in the event of a crash
+ */
+#define HARD_SERVER_LIMIT 10
+
+/* Limit on the total number of threads per process
+ */
+#ifndef HARD_THREAD_LIMIT
+#define HARD_THREAD_LIMIT 256
+#endif
+
+#define ID_FROM_CHILD_THREAD(c, t)    ((c * HARD_THREAD_LIMIT) + t)
+
+typedef struct {
+    apr_pool_t *pconn;
+    apr_socket_t *conn_sd;
+} worker_args_t;
+
+#define WORKTYPE_CONN 0
+#define WORKTYPE_EXIT 1
+
+static apr_pool_t *pchild = NULL;
+static int child_slot;
+static int shutdown_pending = 0;
+extern int ap_my_generation;
+static int volatile is_graceful = 1;
+HEV shutdown_event; /* signaled when this child is shutting down */
+
+/* grab some MPM globals */
+extern int ap_min_spare_threads;
+extern int ap_max_spare_threads;
+extern HMTX ap_mpm_accept_mutex;
+
+static void worker_main(void *vpArg);
+static void clean_child_exit(int code);
+static void set_signals();
+static void server_maintenance(void *vpArg);
+
+
+static void clean_child_exit(int code)
+{
+    if (pchild) {
+        apr_pool_destroy(pchild);
+    }
+
+    exit(code);
+}
+
+
+
+void ap_mpm_child_main(apr_pool_t *pconf)
+{
+    ap_listen_rec *lr = NULL;
+    int requests_this_child = 0;
+    int rv = 0;
+    unsigned long ulTimes;
+    int my_pid = getpid();
+    ULONG rc, c;
+    HQUEUE workq;
+    apr_pollset_t *pollset;
+    int num_listeners;
+    TID server_maint_tid;
+    void *sb_mem;
+
+    /* Stop Ctrl-C/Ctrl-Break signals going to child processes */
+    DosSetSignalExceptionFocus(0, &ulTimes);
+    set_signals();
+
+    /* Create pool for child */
+    apr_pool_create(&pchild, pconf);
+    apr_pool_tag(pchild, "pchild");
+
+    ap_run_child_init(pchild, ap_server_conf);
+
+    /* Create an event semaphore used to trigger other threads to shutdown */
+    rc = DosCreateEventSem(NULL, &shutdown_event, 0, FALSE);
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf, APLOGNO(00189)
+                     "unable to create shutdown semaphore, exiting");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Gain access to the scoreboard. */
+    rc = DosGetNamedSharedMem(&sb_mem, ap_scoreboard_fname,
+                              PAG_READ|PAG_WRITE);
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf, APLOGNO(00190)
+                     "scoreboard not readable in child, exiting");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    ap_calc_scoreboard_size();
+    ap_init_scoreboard(sb_mem);
+
+    /* Gain access to the accpet mutex */
+    rc = DosOpenMutexSem(NULL, &ap_mpm_accept_mutex);
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf, APLOGNO(00191)
+                     "accept mutex couldn't be accessed in child, exiting");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Find our pid in the scoreboard so we know what slot our parent allocated us */
+    for (child_slot = 0; ap_scoreboard_image->parent[child_slot].pid != my_pid && child_slot < HARD_SERVER_LIMIT; child_slot++);
+
+    if (child_slot == HARD_SERVER_LIMIT) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00192)
+                     "child pid not found in scoreboard, exiting");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    ap_my_generation = ap_scoreboard_image->parent[child_slot].generation;
+    memset(ap_scoreboard_image->servers[child_slot], 0, sizeof(worker_score) * HARD_THREAD_LIMIT);
+
+    /* Set up an OS/2 queue for passing connections & termination requests
+     * to worker threads
+     */
+    rc = DosCreateQueue(&workq, QUE_FIFO, apr_psprintf(pchild, "/queues/httpd/work.%d", my_pid));
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf, APLOGNO(00193)
+                     "unable to create work queue, exiting");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Create initial pool of worker threads */
+    for (c = 0; c < ap_min_spare_threads; c++) {
+//        ap_scoreboard_image->servers[child_slot][c].tid = _beginthread(worker_main, NULL, 128*1024, (void *)c);
+    }
+
+    /* Start maintenance thread */
+    server_maint_tid = _beginthread(server_maintenance, NULL, 32768, NULL);
+
+    /* Set up poll */
+    for (num_listeners = 0, lr = ap_listeners; lr; lr = lr->next) {
+        num_listeners++;
+    }
+
+    apr_pollset_create(&pollset, num_listeners, pchild, 0);
+
+    for (lr = ap_listeners; lr != NULL; lr = lr->next) {
+        apr_pollfd_t pfd = { 0 };
+
+        pfd.desc_type = APR_POLL_SOCKET;
+        pfd.desc.s = lr->sd;
+        pfd.reqevents = APR_POLLIN;
+        pfd.client_data = lr;
+        apr_pollset_add(pollset, &pfd);
+    }
+
+    /* Main connection accept loop */
+    do {
+        apr_pool_t *pconn;
+        worker_args_t *worker_args;
+        int last_poll_idx = 0;
+
+        apr_pool_create(&pconn, pchild);
+        worker_args = apr_palloc(pconn, sizeof(worker_args_t));
+        worker_args->pconn = pconn;
+
+        if (num_listeners == 1) {
+            rv = apr_socket_accept(&worker_args->conn_sd, ap_listeners->sd, pconn);
+        } else {
+            const apr_pollfd_t *poll_results;
+            apr_int32_t num_poll_results;
+
+            rc = DosRequestMutexSem(ap_mpm_accept_mutex, SEM_INDEFINITE_WAIT);
+
+            if (shutdown_pending) {
+                DosReleaseMutexSem(ap_mpm_accept_mutex);
+                break;
+            }
+
+            rv = APR_FROM_OS_ERROR(rc);
+
+            if (rv == APR_SUCCESS) {
+                rv = apr_pollset_poll(pollset, -1, &num_poll_results, &poll_results);
+                DosReleaseMutexSem(ap_mpm_accept_mutex);
+            }
+
+            if (rv == APR_SUCCESS) {
+                if (last_poll_idx >= num_listeners) {
+                    last_poll_idx = 0;
+                }
+
+                lr = poll_results[last_poll_idx++].client_data;
+                rv = apr_socket_accept(&worker_args->conn_sd, lr->sd, pconn);
+                last_poll_idx++;
+            }
+        }
+
+        if (rv != APR_SUCCESS) {
+            if (!APR_STATUS_IS_EINTR(rv)) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00194)
+                             "apr_socket_accept");
+                clean_child_exit(APEXIT_CHILDFATAL);
+            }
+        } else {
+            DosWriteQueue(workq, WORKTYPE_CONN, sizeof(worker_args_t), worker_args, 0);
+            requests_this_child++;
+        }
+
+        if (ap_max_requests_per_child != 0 && requests_this_child >= ap_max_requests_per_child)
+            break;
+    } while (!shutdown_pending && ap_my_generation == ap_scoreboard_image->global->running_generation);
+
+    ap_scoreboard_image->parent[child_slot].quiescing = 1;
+    DosPostEventSem(shutdown_event);
+    DosWaitThread(&server_maint_tid, DCWW_WAIT);
+
+    if (is_graceful) {
+        char someleft;
+
+        /* tell our worker threads to exit */
+        for (c=0; c<HARD_THREAD_LIMIT; c++) {
+            if (ap_scoreboard_image->servers[child_slot][c].status != SERVER_DEAD) {
+                DosWriteQueue(workq, WORKTYPE_EXIT, 0, NULL, 0);
+            }
+        }
+
+        do {
+            someleft = 0;
+
+            for (c=0; c<HARD_THREAD_LIMIT; c++) {
+                if (ap_scoreboard_image->servers[child_slot][c].status != SERVER_DEAD) {
+                    someleft = 1;
+                    DosSleep(1000);
+                    break;
+                }
+            }
+        } while (someleft);
+    } else {
+        DosPurgeQueue(workq);
+
+        for (c=0; c<HARD_THREAD_LIMIT; c++) {
+            if (ap_scoreboard_image->servers[child_slot][c].status != SERVER_DEAD) {
+                DosKillThread(ap_scoreboard_image->servers[child_slot][c].tid);
+            }
+        }
+    }
+
+    apr_pool_destroy(pchild);
+}
+
+
+
+void add_worker()
+{
+    int thread_slot;
+    int stacksize = ap_thread_stacksize == 0 ? 128*1024 : ap_thread_stacksize;
+
+    /* Find a free thread slot */
+    for (thread_slot=0; thread_slot < HARD_THREAD_LIMIT; thread_slot++) {
+        if (ap_scoreboard_image->servers[child_slot][thread_slot].status == SERVER_DEAD) {
+            ap_scoreboard_image->servers[child_slot][thread_slot].status = SERVER_STARTING;
+            ap_scoreboard_image->servers[child_slot][thread_slot].tid =
+                _beginthread(worker_main, NULL, stacksize, (void *)thread_slot);
+            break;
+        }
+    }
+}
+
+
+
+ULONG APIENTRY thread_exception_handler(EXCEPTIONREPORTRECORD *pReportRec,
+                                        EXCEPTIONREGISTRATIONRECORD *pRegRec,
+                                        CONTEXTRECORD *pContext,
+                                        PVOID p)
+{
+    int c;
+
+    if (pReportRec->fHandlerFlags & EH_NESTED_CALL) {
+        return XCPT_CONTINUE_SEARCH;
+    }
+
+    if (pReportRec->ExceptionNum == XCPT_ACCESS_VIOLATION ||
+        pReportRec->ExceptionNum == XCPT_INTEGER_DIVIDE_BY_ZERO) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00195)
+                     "caught exception in worker thread, initiating child shutdown pid=%d", getpid());
+        for (c=0; c<HARD_THREAD_LIMIT; c++) {
+            if (ap_scoreboard_image->servers[child_slot][c].tid == _gettid()) {
+                ap_scoreboard_image->servers[child_slot][c].status = SERVER_DEAD;
+                break;
+            }
+        }
+
+        /* Shut down process ASAP, it could be quite unhealthy & leaking resources */
+        shutdown_pending = 1;
+        ap_scoreboard_image->parent[child_slot].quiescing = 1;
+        kill(getpid(), SIGHUP);
+        DosUnwindException(UNWIND_ALL, 0, 0);
+    }
+
+    return XCPT_CONTINUE_SEARCH;
+}
+
+
+
+static void worker_main(void *vpArg)
+{
+    apr_thread_t *thd = NULL;
+    apr_os_thread_t osthd;
+    long conn_id;
+    conn_rec *current_conn;
+    apr_pool_t *pconn;
+    apr_allocator_t *allocator;
+    apr_bucket_alloc_t *bucket_alloc;
+    worker_args_t *worker_args;
+    HQUEUE workq;
+    PID owner;
+    int rc;
+    REQUESTDATA rd;
+    ULONG len;
+    BYTE priority;
+    int thread_slot = (int)vpArg;
+    EXCEPTIONREGISTRATIONRECORD reg_rec = { NULL, thread_exception_handler };
+    ap_sb_handle_t *sbh;
+
+    /* Trap exceptions in this thread so we don't take down the whole process */
+    DosSetExceptionHandler( &reg_rec );
+
+    osthd = apr_os_thread_current();
+    apr_os_thread_put(&thd, &osthd, pchild);
+
+    rc = DosOpenQueue(&owner, &workq,
+                      apr_psprintf(pchild, "/queues/httpd/work.%d", getpid()));
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf, APLOGNO(00196)
+                     "unable to open work queue, exiting");
+        ap_scoreboard_image->servers[child_slot][thread_slot].tid = 0;
+    }
+
+    conn_id = ID_FROM_CHILD_THREAD(child_slot, thread_slot);
+    ap_update_child_status_from_indexes(child_slot, thread_slot, SERVER_READY,
+                                        NULL);
+
+    apr_allocator_create(&allocator);
+    apr_allocator_max_free_set(allocator, ap_max_mem_free);
+    bucket_alloc = apr_bucket_alloc_create_ex(allocator);
+
+    while (rc = DosReadQueue(workq, &rd, &len, (PPVOID)&worker_args, 0, DCWW_WAIT, &priority, NULLHANDLE),
+           rc == 0 && rd.ulData != WORKTYPE_EXIT) {
+        pconn = worker_args->pconn;
+        ap_create_sb_handle(&sbh, pconn, child_slot, thread_slot);
+        current_conn = ap_run_create_connection(pconn, ap_server_conf,
+                                                worker_args->conn_sd, conn_id,
+                                                sbh, bucket_alloc);
+
+        if (current_conn) {
+            current_conn->current_thread = thd;
+            ap_process_connection(current_conn, worker_args->conn_sd);
+            ap_lingering_close(current_conn);
+        }
+
+        apr_pool_destroy(pconn);
+        ap_update_child_status_from_indexes(child_slot, thread_slot,
+                                            SERVER_READY, NULL);
+    }
+
+    ap_update_child_status_from_indexes(child_slot, thread_slot, SERVER_DEAD,
+                                        NULL);
+
+    apr_bucket_alloc_destroy(bucket_alloc);
+    apr_allocator_destroy(allocator);
+}
+
+
+
+static void server_maintenance(void *vpArg)
+{
+    int num_idle, num_needed;
+    ULONG num_pending = 0;
+    int threadnum;
+    HQUEUE workq;
+    ULONG rc;
+    PID owner;
+
+    rc = DosOpenQueue(&owner, &workq,
+                      apr_psprintf(pchild, "/queues/httpd/work.%d", getpid()));
+
+    if (rc) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, APR_FROM_OS_ERROR(rc), ap_server_conf, APLOGNO(00197)
+                     "unable to open work queue in maintenance thread");
+        return;
+    }
+
+    do {
+        for (num_idle=0, threadnum=0; threadnum < HARD_THREAD_LIMIT; threadnum++) {
+            num_idle += ap_scoreboard_image->servers[child_slot][threadnum].status == SERVER_READY;
+        }
+
+        DosQueryQueue(workq, &num_pending);
+        num_needed = ap_min_spare_threads - num_idle + num_pending;
+
+        if (num_needed > 0) {
+            for (threadnum=0; threadnum < num_needed; threadnum++) {
+                add_worker();
+            }
+        }
+
+        if (num_idle - num_pending > ap_max_spare_threads) {
+            DosWriteQueue(workq, WORKTYPE_EXIT, 0, NULL, 0);
+        }
+    } while (DosWaitEventSem(shutdown_event, 500) == ERROR_TIMEOUT);
+}
+
+
+
+/* Signal handling routines */
+
+static void sig_term(int sig)
+{
+    shutdown_pending = 1;
+    is_graceful = 0;
+    signal(SIGTERM, SIG_DFL);
+}
+
+
+
+static void sig_hup(int sig)
+{
+    shutdown_pending = 1;
+    is_graceful = 1;
+}
+
+
+
+static void set_signals()
+{
+    struct sigaction sa;
+
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sa.sa_handler = sig_term;
+
+    if (sigaction(SIGTERM, &sa, NULL) < 0)
+        ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00198) "sigaction(SIGTERM)");
+
+    sa.sa_handler = sig_hup;
+
+    if (sigaction(SIGHUP, &sa, NULL) < 0)
+        ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00199) "sigaction(SIGHUP)");
+}
diff --git a/server/mpm/netware/mpm_default.h b/server/mpm/netware/mpm_default.h
new file mode 100644
index 0000000..f7783ce
--- /dev/null
+++ b/server/mpm/netware/mpm_default.h
@@ -0,0 +1,78 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file  netware/mpm_default.h
+ * @brief Defaults for Netware MPM
+ *
+ * @defgroup APACHE_MPM_NETWARE Netware MPM
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Limit on the threads per process.  Clients will be locked out if more than
+ * this  * HARD_SERVER_LIMIT are needed.
+ *
+ * We keep this for one reason it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef HARD_THREAD_LIMIT
+#define HARD_THREAD_LIMIT 2048
+#endif
+
+#ifndef DEFAULT_THREADS_PER_CHILD
+#define DEFAULT_THREADS_PER_CHILD 50
+#endif
+
+/* Number of threads to spawn off by default --- also, if fewer than
+ * this free when the caretaker checks, it will spawn more.
+ */
+#ifndef DEFAULT_START_THREADS
+#define DEFAULT_START_THREADS DEFAULT_THREADS_PER_CHILD
+#endif
+
+/* Maximum number of *free* threads --- more than this, and
+ * they will die off.
+ */
+
+#ifndef DEFAULT_MAX_FREE_THREADS
+#define DEFAULT_MAX_FREE_THREADS 100
+#endif
+
+/* Minimum --- fewer than this, and more will be created */
+
+#ifndef DEFAULT_MIN_FREE_THREADS
+#define DEFAULT_MIN_FREE_THREADS 10
+#endif
+
+/*
+ * Interval, in microseconds, between scoreboard maintenance.
+ */
+#ifndef SCOREBOARD_MAINTENANCE_INTERVAL
+#define SCOREBOARD_MAINTENANCE_INTERVAL 1000000
+#endif
+
+/* Default stack size allocated for each worker thread.
+ */
+#ifndef DEFAULT_THREAD_STACKSIZE
+#define DEFAULT_THREAD_STACKSIZE 65536
+#endif
+
+#endif /* AP_MPM_DEFAULT_H */
+/** @} */
diff --git a/server/mpm/netware/mpm_netware.c b/server/mpm/netware/mpm_netware.c
new file mode 100644
index 0000000..8248033
--- /dev/null
+++ b/server/mpm/netware/mpm_netware.c
@@ -0,0 +1,1364 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * httpd.c: simple http daemon for answering WWW file requests
+ *
+ *
+ * 03-21-93  Rob McCool wrote original code (up to NCSA HTTPd 1.3)
+ *
+ * 03-06-95  blong
+ *  changed server number for child-alone processes to 0 and changed name
+ *   of processes
+ *
+ * 03-10-95  blong
+ *      Added numerous speed hacks proposed by Robert S. Thau (rst@ai.mit.edu)
+ *      including set group before fork, and call gettime before to fork
+ *      to set up libraries.
+ *
+ * 04-14-95  rst / rh
+ *      Brandon's code snarfed from NCSA 1.4, but tinkered to work with the
+ *      Apache server, and also to have child processes do accept() directly.
+ *
+ * April-July '95 rst
+ *      Extensive rework for Apache.
+ */
+
+#include "apr.h"
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+#include "apr_tables.h"
+#include "apr_getopt.h"
+#include "apr_thread_mutex.h"
+
+#define APR_WANT_STDIO
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifndef USE_WINSOCK
+#include <sys/select.h>
+#endif
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "mpm_default.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h"
+#include "http_core.h"             /* for get_remote_host */
+#include "http_connection.h"
+#include "scoreboard.h"
+#include "ap_mpm.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "ap_mmn.h"
+
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif
+
+#include <signal.h>
+
+#include <netware.h>
+#include <nks/netware.h>
+#include <library.h>
+#include <screen.h>
+
+int nlmUnloadSignaled(int wait);
+
+/* Limit on the total --- clients will be locked out if more servers than
+ * this are needed.  It is intended solely to keep the server from crashing
+ * when things get out of hand.
+ *
+ * We keep a hard maximum number of servers, for two reasons --- first off,
+ * in case something goes seriously wrong, we want to stop the fork bomb
+ * short of actually crashing the machine we're running on by filling some
+ * kernel table.  Secondly, it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef HARD_SERVER_LIMIT
+#define HARD_SERVER_LIMIT 1
+#endif
+
+#define WORKER_DEAD         SERVER_DEAD
+#define WORKER_STARTING     SERVER_STARTING
+#define WORKER_READY        SERVER_READY
+#define WORKER_IDLE_KILL    SERVER_IDLE_KILL
+
+#define MPM_HARD_LIMITS_FILE "/mpm_default.h"
+
+/* *Non*-shared http_main globals... */
+
+static int ap_threads_per_child=0;         /* Worker threads per child */
+static int ap_threads_to_start=0;
+static int ap_threads_min_free=0;
+static int ap_threads_max_free=0;
+static int ap_threads_limit=0;
+static int mpm_state = AP_MPMQ_STARTING;
+
+/*
+ * The max child slot ever assigned, preserved across restarts.  Necessary
+ * to deal with MaxRequestWorkers changes across SIGWINCH restarts.  We use this
+ * value to optimize routines that have to scan the entire scoreboard.
+ */
+static int ap_max_workers_limit = -1;
+
+int hold_screen_on_exit = 0; /* Indicates whether the screen should be held open */
+
+static fd_set listenfds;
+static int listenmaxfd;
+
+static apr_pool_t *pconf;               /* Pool for config stuff */
+static apr_pool_t *pmain;               /* Pool for httpd child stuff */
+
+static pid_t ap_my_pid;  /* it seems silly to call getpid all the time */
+static char *ap_my_addrspace = NULL;
+
+static int die_now = 0;
+
+/* Keep track of the number of worker threads currently active */
+static unsigned long worker_thread_count;
+static int request_count;
+
+/*  Structure used to register/deregister a console handler with the OS */
+static int InstallConsoleHandler(void);
+static void RemoveConsoleHandler(void);
+static int CommandLineInterpreter(scr_t screenID, const char *commandLine);
+static  CommandParser_t ConsoleHandler = {0, NULL, 0};
+#define HANDLEDCOMMAND  0
+#define NOTMYCOMMAND    1
+
+static int show_settings = 0;
+
+//#define DBINFO_ON
+//#define DBPRINT_ON
+#ifdef DBPRINT_ON
+#define DBPRINT0(s) printf(s)
+#define DBPRINT1(s,v1) printf(s,v1)
+#define DBPRINT2(s,v1,v2) printf(s,v1,v2)
+#else
+#define DBPRINT0(s)
+#define DBPRINT1(s,v1)
+#define DBPRINT2(s,v1,v2)
+#endif
+
+/* volatile just in case */
+static int volatile shutdown_pending;
+static int volatile restart_pending;
+static int volatile is_graceful;
+static int volatile wait_to_finish=1;
+static ap_generation_t volatile ap_my_generation=0;
+
+/* a clean exit from a child with proper cleanup */
+static void clean_child_exit(int code, int worker_num, apr_pool_t *ptrans,
+                             apr_bucket_alloc_t *bucket_alloc) __attribute__ ((noreturn));
+static void clean_child_exit(int code, int worker_num, apr_pool_t *ptrans,
+                             apr_bucket_alloc_t *bucket_alloc)
+{
+    apr_bucket_alloc_destroy(bucket_alloc);
+    if (!shutdown_pending) {
+        apr_pool_destroy(ptrans);
+    }
+
+    atomic_dec (&worker_thread_count);
+    if (worker_num >=0)
+        ap_update_child_status_from_indexes(0, worker_num, WORKER_DEAD,
+                                            (request_rec *) NULL);
+    NXThreadExit((void*)&code);
+}
+
+/* proper cleanup when returning from ap_mpm_run() */
+static void mpm_main_cleanup(void)
+{
+    if (pmain) {
+        apr_pool_destroy(pmain);
+    }
+}
+
+static int netware_query(int query_code, int *result, apr_status_t *rv)
+{
+    *rv = APR_SUCCESS;
+    switch(query_code){
+        case AP_MPMQ_MAX_DAEMON_USED:
+            *result = 1;
+            break;
+        case AP_MPMQ_IS_THREADED:
+            *result = AP_MPMQ_DYNAMIC;
+            break;
+        case AP_MPMQ_IS_FORKED:
+            *result = AP_MPMQ_NOT_SUPPORTED;
+            break;
+        case AP_MPMQ_HARD_LIMIT_DAEMONS:
+            *result = HARD_SERVER_LIMIT;
+            break;
+        case AP_MPMQ_HARD_LIMIT_THREADS:
+            *result = HARD_THREAD_LIMIT;
+            break;
+        case AP_MPMQ_MAX_THREADS:
+            *result = ap_threads_limit;
+            break;
+        case AP_MPMQ_MIN_SPARE_DAEMONS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MIN_SPARE_THREADS:
+            *result = ap_threads_min_free;
+            break;
+        case AP_MPMQ_MAX_SPARE_DAEMONS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MAX_SPARE_THREADS:
+            *result = ap_threads_max_free;
+            break;
+        case AP_MPMQ_MAX_REQUESTS_DAEMON:
+            *result = ap_max_requests_per_child;
+            break;
+        case AP_MPMQ_MAX_DAEMONS:
+            *result = 1;
+            break;
+        case AP_MPMQ_MPM_STATE:
+            *result = mpm_state;
+            break;
+        case AP_MPMQ_GENERATION:
+            *result = ap_my_generation;
+            break;
+        default:
+            *rv = APR_ENOTIMPL;
+            break;
+    }
+    return OK;
+}
+
+static const char *netware_get_name(void)
+{
+    return "NetWare";
+}
+
+/*****************************************************************
+ * Connection structures and accounting...
+ */
+
+static void mpm_term(void)
+{
+    RemoveConsoleHandler();
+    wait_to_finish = 0;
+    NXThreadYield();
+}
+
+static void sig_term(int sig)
+{
+    if (shutdown_pending == 1) {
+        /* Um, is this _probably_ not an error, if the user has
+         * tried to do a shutdown twice quickly, so we won't
+         * worry about reporting it.
+         */
+        return;
+    }
+    shutdown_pending = 1;
+
+    DBPRINT0 ("waiting for threads\n");
+    while (wait_to_finish) {
+        apr_thread_yield();
+    }
+    DBPRINT0 ("goodbye\n");
+}
+
+/* restart() is the signal handler for SIGHUP and SIGWINCH
+ * in the parent process, unless running in ONE_PROCESS mode
+ */
+static void restart(void)
+{
+    if (restart_pending == 1) {
+        /* Probably not an error - don't bother reporting it */
+        return;
+    }
+    restart_pending = 1;
+    is_graceful = 1;
+}
+
+static void set_signals(void)
+{
+    apr_signal(SIGTERM, sig_term);
+    apr_signal(SIGABRT, sig_term);
+}
+
+int nlmUnloadSignaled(int wait)
+{
+    shutdown_pending = 1;
+
+    if (wait) {
+        while (wait_to_finish) {
+            NXThreadYield();
+        }
+    }
+
+    return 0;
+}
+
+/*****************************************************************
+ * Child process main loop.
+ * The following vars are static to avoid getting clobbered by longjmp();
+ * they are really private to child_main.
+ */
+
+
+#define MAX_WB_RETRIES  3
+#ifdef DBINFO_ON
+static int would_block = 0;
+static int retry_success = 0;
+static int retry_fail = 0;
+static int avg_retries = 0;
+#endif
+
+/*static */
+void worker_main(void *arg)
+{
+    ap_listen_rec *lr, *first_lr, *last_lr = NULL;
+    apr_pool_t *ptrans;
+    apr_allocator_t *allocator;
+    apr_bucket_alloc_t *bucket_alloc;
+    conn_rec *current_conn;
+    apr_status_t stat = APR_EINIT;
+    ap_sb_handle_t *sbh;
+    apr_thread_t *thd = NULL;
+    apr_os_thread_t osthd;
+
+    int my_worker_num = (int)arg;
+    apr_socket_t *csd = NULL;
+    int requests_this_child = 0;
+    apr_socket_t *sd = NULL;
+    fd_set main_fds;
+
+    int sockdes;
+    int srv;
+    struct timeval tv;
+    int wouldblock_retry;
+
+    osthd = apr_os_thread_current();
+    apr_os_thread_put(&thd, &osthd, pmain);
+
+    tv.tv_sec = 1;
+    tv.tv_usec = 0;
+
+    apr_allocator_create(&allocator);
+    apr_allocator_max_free_set(allocator, ap_max_mem_free);
+
+    apr_pool_create_ex(&ptrans, pmain, NULL, allocator);
+    apr_allocator_owner_set(allocator, ptrans);
+    apr_pool_tag(ptrans, "transaction");
+
+    bucket_alloc = apr_bucket_alloc_create_ex(allocator);
+
+    atomic_inc (&worker_thread_count);
+
+    while (!die_now) {
+        /*
+        * (Re)initialize this child to a pre-connection state.
+        */
+        current_conn = NULL;
+        apr_pool_clear(ptrans);
+
+        if ((ap_max_requests_per_child > 0
+            && requests_this_child++ >= ap_max_requests_per_child)) {
+            DBPRINT1 ("\n**Thread slot %d is shutting down", my_worker_num);
+            clean_child_exit(0, my_worker_num, ptrans, bucket_alloc);
+        }
+
+        ap_update_child_status_from_indexes(0, my_worker_num, WORKER_READY,
+                                            (request_rec *) NULL);
+
+        /*
+        * Wait for an acceptable connection to arrive.
+        */
+
+        for (;;) {
+            if (shutdown_pending || restart_pending || (ap_scoreboard_image->servers[0][my_worker_num].status == WORKER_IDLE_KILL)) {
+                DBPRINT1 ("\nThread slot %d is shutting down\n", my_worker_num);
+                clean_child_exit(0, my_worker_num, ptrans, bucket_alloc);
+            }
+
+            /* Check the listen queue on all sockets for requests */
+            memcpy(&main_fds, &listenfds, sizeof(fd_set));
+            srv = select(listenmaxfd + 1, &main_fds, NULL, NULL, &tv);
+
+            if (srv <= 0) {
+                if (srv < 0) {
+                    ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00217)
+                        "select() failed on listen socket");
+                    apr_thread_yield();
+                }
+                continue;
+            }
+
+            /* remember the last_lr we searched last time around so that
+            we don't end up starving any particular listening socket */
+            if (last_lr == NULL) {
+                lr = ap_listeners;
+            }
+            else {
+                lr = last_lr->next;
+                if (!lr)
+                    lr = ap_listeners;
+            }
+            first_lr = lr;
+            do {
+                apr_os_sock_get(&sockdes, lr->sd);
+                if (FD_ISSET(sockdes, &main_fds))
+                    goto got_listener;
+                lr = lr->next;
+                if (!lr)
+                    lr = ap_listeners;
+            } while (lr != first_lr);
+            /* if we get here, something unexpected happened. Go back
+            into the select state and try again.
+            */
+            continue;
+        got_listener:
+            last_lr = lr;
+            sd = lr->sd;
+
+            wouldblock_retry = MAX_WB_RETRIES;
+
+            while (wouldblock_retry) {
+                if ((stat = apr_socket_accept(&csd, sd, ptrans)) == APR_SUCCESS) {
+                    break;
+                }
+                else {
+                    /* if the error is a wouldblock then maybe we were too
+                        quick try to pull the next request from the listen
+                        queue.  Try a few more times then return to our idle
+                        listen state. */
+                    if (!APR_STATUS_IS_EAGAIN(stat)) {
+                        break;
+                    }
+
+                    if (wouldblock_retry--) {
+                        apr_thread_yield();
+                    }
+                }
+            }
+
+            /* If we got a new socket, set it to non-blocking mode and process
+                it.  Otherwise handle the error. */
+            if (stat == APR_SUCCESS) {
+                apr_socket_opt_set(csd, APR_SO_NONBLOCK, 0);
+#ifdef DBINFO_ON
+                if (wouldblock_retry < MAX_WB_RETRIES) {
+                    retry_success++;
+                    avg_retries += (MAX_WB_RETRIES-wouldblock_retry);
+                }
+#endif
+                break;       /* We have a socket ready for reading */
+            }
+            else {
+#ifdef DBINFO_ON
+                if (APR_STATUS_IS_EAGAIN(stat)) {
+                        would_block++;
+                        retry_fail++;
+                }
+                else if (
+#else
+                if (APR_STATUS_IS_EAGAIN(stat) ||
+#endif
+                    APR_STATUS_IS_ECONNRESET(stat) ||
+                    APR_STATUS_IS_ETIMEDOUT(stat) ||
+                    APR_STATUS_IS_EHOSTUNREACH(stat) ||
+                    APR_STATUS_IS_ENETUNREACH(stat)) {
+                        ;
+                }
+#ifdef USE_WINSOCK
+                else if (APR_STATUS_IS_ENETDOWN(stat)) {
+                       /*
+                        * When the network layer has been shut down, there
+                        * is not much use in simply exiting: the parent
+                        * would simply re-create us (and we'd fail again).
+                        * Use the CHILDFATAL code to tear the server down.
+                        * @@@ Martin's idea for possible improvement:
+                        * A different approach would be to define
+                        * a new APEXIT_NETDOWN exit code, the reception
+                        * of which would make the parent shutdown all
+                        * children, then idle-loop until it detected that
+                        * the network is up again, and restart the children.
+                        * Ben Hyde noted that temporary ENETDOWN situations
+                        * occur in mobile IP.
+                        */
+                        ap_log_error(APLOG_MARK, APLOG_EMERG, stat, ap_server_conf, APLOGNO(00218)
+                            "apr_socket_accept: giving up.");
+                        clean_child_exit(APEXIT_CHILDFATAL, my_worker_num, ptrans,
+                                         bucket_alloc);
+                }
+#endif
+                else {
+                        ap_log_error(APLOG_MARK, APLOG_ERR, stat, ap_server_conf, APLOGNO(00219)
+                            "apr_socket_accept: (client socket)");
+                        clean_child_exit(1, my_worker_num, ptrans, bucket_alloc);
+                }
+            }
+        }
+
+        ap_create_sb_handle(&sbh, ptrans, 0, my_worker_num);
+        /*
+        * We now have a connection, so set it up with the appropriate
+        * socket options, file descriptors, and read/write buffers.
+        */
+        current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd,
+                                                my_worker_num, sbh,
+                                                bucket_alloc);
+        if (current_conn) {
+            current_conn->current_thread = thd;
+            ap_process_connection(current_conn, csd);
+            ap_lingering_close(current_conn);
+        }
+        request_count++;
+    }
+    clean_child_exit(0, my_worker_num, ptrans, bucket_alloc);
+}
+
+
+static int make_child(server_rec *s, int slot)
+{
+    int tid;
+    int err=0;
+    NXContext_t ctx;
+
+    if (slot + 1 > ap_max_workers_limit) {
+        ap_max_workers_limit = slot + 1;
+    }
+
+    ap_update_child_status_from_indexes(0, slot, WORKER_STARTING,
+                                        (request_rec *) NULL);
+
+    if (ctx = NXContextAlloc((void (*)(void *)) worker_main, (void*)slot, NX_PRIO_MED, ap_thread_stacksize, NX_CTX_NORMAL, &err)) {
+        char threadName[32];
+
+        sprintf (threadName, "Apache_Worker %d", slot);
+        NXContextSetName(ctx, threadName);
+        err = NXThreadCreate(ctx, NX_THR_BIND_CONTEXT, &tid);
+        if (err) {
+            NXContextFree (ctx);
+        }
+    }
+
+    if (err) {
+        /* create thread didn't succeed. Fix the scoreboard or else
+        * it will say SERVER_STARTING forever and ever
+        */
+        ap_update_child_status_from_indexes(0, slot, WORKER_DEAD,
+                                            (request_rec *) NULL);
+
+        /* In case system resources are maxxed out, we don't want
+        Apache running away with the CPU trying to fork over and
+        over and over again. */
+        apr_thread_yield();
+
+        return -1;
+    }
+
+    ap_scoreboard_image->servers[0][slot].tid = tid;
+
+    return 0;
+}
+
+
+/* start up a bunch of worker threads */
+static void startup_workers(int number_to_start)
+{
+    int i;
+
+    for (i = 0; number_to_start && i < ap_threads_limit; ++i) {
+        if (ap_scoreboard_image->servers[0][i].status != WORKER_DEAD) {
+            continue;
+        }
+        if (make_child(ap_server_conf, i) < 0) {
+            break;
+        }
+        --number_to_start;
+    }
+}
+
+
+/*
+ * idle_spawn_rate is the number of children that will be spawned on the
+ * next maintenance cycle if there aren't enough idle servers.  It is
+ * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
+ * without the need to spawn.
+ */
+static int idle_spawn_rate = 1;
+#ifndef MAX_SPAWN_RATE
+#define MAX_SPAWN_RATE (64)
+#endif
+static int hold_off_on_exponential_spawning;
+
+static void perform_idle_server_maintenance(apr_pool_t *p)
+{
+    int i;
+    int idle_count;
+    worker_score *ws;
+    int free_length;
+    int free_slots[MAX_SPAWN_RATE];
+    int last_non_dead;
+    int total_non_dead;
+
+    /* initialize the free_list */
+    free_length = 0;
+
+    idle_count = 0;
+    last_non_dead = -1;
+    total_non_dead = 0;
+
+    for (i = 0; i < ap_threads_limit; ++i) {
+        int status;
+
+        if (i >= ap_max_workers_limit && free_length == idle_spawn_rate)
+            break;
+        ws = &ap_scoreboard_image->servers[0][i];
+        status = ws->status;
+        if (status == WORKER_DEAD) {
+            /* try to keep children numbers as low as possible */
+            if (free_length < idle_spawn_rate) {
+                free_slots[free_length] = i;
+                ++free_length;
+            }
+        }
+        else if (status == WORKER_IDLE_KILL) {
+            /* If it is already marked to die, skip it */
+            continue;
+        }
+        else {
+            /* We consider a starting server as idle because we started it
+            * at least a cycle ago, and if it still hasn't finished starting
+            * then we're just going to swamp things worse by forking more.
+            * So we hopefully won't need to fork more if we count it.
+            * This depends on the ordering of SERVER_READY and SERVER_STARTING.
+            */
+            if (status <= WORKER_READY) {
+                ++ idle_count;
+            }
+
+            ++total_non_dead;
+            last_non_dead = i;
+        }
+    }
+    DBPRINT2("Total: %d Idle Count: %d  \r", total_non_dead, idle_count);
+    ap_max_workers_limit = last_non_dead + 1;
+    if (idle_count > ap_threads_max_free) {
+        /* kill off one child... we use the pod because that'll cause it to
+        * shut down gracefully, in case it happened to pick up a request
+        * while we were counting
+        */
+        idle_spawn_rate = 1;
+        ap_update_child_status_from_indexes(0, last_non_dead, WORKER_IDLE_KILL,
+                                            (request_rec *) NULL);
+        DBPRINT1("\nKilling idle thread: %d\n", last_non_dead);
+    }
+    else if (idle_count < ap_threads_min_free) {
+        /* terminate the free list */
+        if (free_length == 0) {
+            /* only report this condition once */
+            static int reported = 0;
+
+            if (!reported) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00220)
+                    "server reached MaxRequestWorkers setting, consider"
+                    " raising the MaxRequestWorkers setting");
+                reported = 1;
+            }
+            idle_spawn_rate = 1;
+        }
+        else {
+            if (idle_spawn_rate >= 8) {
+                ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00221)
+                    "server seems busy, (you may need "
+                    "to increase StartServers, or Min/MaxSpareServers), "
+                    "spawning %d children, there are %d idle, and "
+                    "%d total children", idle_spawn_rate,
+                    idle_count, total_non_dead);
+            }
+            DBPRINT0("\n");
+            for (i = 0; i < free_length; ++i) {
+                DBPRINT1("Spawning additional thread slot: %d\n", free_slots[i]);
+                make_child(ap_server_conf, free_slots[i]);
+            }
+            /* the next time around we want to spawn twice as many if this
+            * wasn't good enough, but not if we've just done a graceful
+            */
+            if (hold_off_on_exponential_spawning) {
+                --hold_off_on_exponential_spawning;
+            }
+            else if (idle_spawn_rate < MAX_SPAWN_RATE) {
+                idle_spawn_rate *= 2;
+            }
+        }
+    }
+    else {
+        idle_spawn_rate = 1;
+    }
+}
+
+static void display_settings()
+{
+    int status_array[SERVER_NUM_STATUS];
+    int i, status, total=0;
+    int reqs = request_count;
+#ifdef DBINFO_ON
+    int wblock = would_block;
+
+    would_block = 0;
+#endif
+
+    request_count = 0;
+
+    ClearScreen (getscreenhandle());
+    printf("%s \n", ap_get_server_description());
+
+    for (i=0;i<SERVER_NUM_STATUS;i++) {
+        status_array[i] = 0;
+    }
+
+    for (i = 0; i < ap_threads_limit; ++i) {
+        status = (ap_scoreboard_image->servers[0][i]).status;
+        status_array[status]++;
+    }
+
+    for (i=0;i<SERVER_NUM_STATUS;i++) {
+        switch(i)
+        {
+        case SERVER_DEAD:
+            printf ("Available:\t%d\n", status_array[i]);
+            break;
+        case SERVER_STARTING:
+            printf ("Starting:\t%d\n", status_array[i]);
+            break;
+        case SERVER_READY:
+            printf ("Ready:\t\t%d\n", status_array[i]);
+            break;
+        case SERVER_BUSY_READ:
+            printf ("Busy:\t\t%d\n", status_array[i]);
+            break;
+        case SERVER_BUSY_WRITE:
+            printf ("Busy Write:\t%d\n", status_array[i]);
+            break;
+        case SERVER_BUSY_KEEPALIVE:
+            printf ("Busy Keepalive:\t%d\n", status_array[i]);
+            break;
+        case SERVER_BUSY_LOG:
+            printf ("Busy Log:\t%d\n", status_array[i]);
+            break;
+        case SERVER_BUSY_DNS:
+            printf ("Busy DNS:\t%d\n", status_array[i]);
+            break;
+        case SERVER_CLOSING:
+            printf ("Closing:\t%d\n", status_array[i]);
+            break;
+        case SERVER_GRACEFUL:
+            printf ("Restart:\t%d\n", status_array[i]);
+            break;
+        case SERVER_IDLE_KILL:
+            printf ("Idle Kill:\t%d\n", status_array[i]);
+            break;
+        default:
+            printf ("Unknown Status:\t%d\n", status_array[i]);
+            break;
+        }
+        if (i != SERVER_DEAD)
+            total+=status_array[i];
+    }
+    printf ("Total Running:\t%d\tout of: \t%d\n", total, ap_threads_limit);
+    printf ("Requests per interval:\t%d\n", reqs);
+
+#ifdef DBINFO_ON
+    printf ("Would blocks:\t%d\n", wblock);
+    printf ("Successful retries:\t%d\n", retry_success);
+    printf ("Failed retries:\t%d\n", retry_fail);
+    printf ("Avg retries:\t%d\n", retry_success == 0 ? 0 : avg_retries / retry_success);
+#endif
+}
+
+static void show_server_data()
+{
+    ap_listen_rec *lr;
+    module **m;
+
+    printf("%s\n", ap_get_server_description());
+    if (ap_my_addrspace && (ap_my_addrspace[0] != 'O') && (ap_my_addrspace[1] != 'S'))
+        printf("   Running in address space %s\n", ap_my_addrspace);
+
+
+    /* Display listening ports */
+    printf("   Listening on port(s):");
+    lr = ap_listeners;
+    do {
+       printf(" %d", lr->bind_addr->port);
+       lr = lr->next;
+    } while (lr && lr != ap_listeners);
+
+    /* Display dynamic modules loaded */
+    printf("\n");
+    for (m = ap_loaded_modules; *m != NULL; m++) {
+        if (((module*)*m)->dynamic_load_handle) {
+            printf("   Loaded dynamic module %s\n", ((module*)*m)->name);
+        }
+    }
+}
+
+
+static int setup_listeners(server_rec *s)
+{
+    ap_listen_rec *lr;
+    int sockdes;
+
+    if (ap_setup_listeners(s) < 1 ) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, 0, s, APLOGNO(00222)
+            "no listening sockets available, shutting down");
+        return -1;
+    }
+
+    listenmaxfd = -1;
+    FD_ZERO(&listenfds);
+    for (lr = ap_listeners; lr; lr = lr->next) {
+        apr_os_sock_get(&sockdes, lr->sd);
+        FD_SET(sockdes, &listenfds);
+        if (sockdes > listenmaxfd) {
+            listenmaxfd = sockdes;
+        }
+    }
+    return 0;
+}
+
+static int shutdown_listeners()
+{
+    ap_listen_rec *lr;
+
+    for (lr = ap_listeners; lr; lr = lr->next) {
+        apr_socket_close(lr->sd);
+    }
+    ap_listeners = NULL;
+    return 0;
+}
+
+/*****************************************************************
+ * Executive routines.
+ */
+
+static int netware_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
+{
+    apr_status_t status=0;
+
+    pconf = _pconf;
+    ap_server_conf = s;
+
+    if (setup_listeners(s)) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, status, s, APLOGNO(00223)
+            "no listening sockets available, shutting down");
+        return !OK;
+    }
+
+    restart_pending = shutdown_pending = 0;
+    worker_thread_count = 0;
+
+    if (!is_graceful) {
+        if (ap_run_pre_mpm(s->process->pool, SB_NOT_SHARED) != OK) {
+            return !OK;
+        }
+    }
+
+    /* Only set slot 0 since that is all NetWare will ever have. */
+    ap_scoreboard_image->parent[0].pid = getpid();
+    ap_scoreboard_image->parent[0].generation = ap_my_generation;
+    ap_run_child_status(ap_server_conf,
+                        ap_scoreboard_image->parent[0].pid,
+                        ap_my_generation,
+                        0,
+                        MPM_CHILD_STARTED);
+
+    set_signals();
+
+    apr_pool_create(&pmain, pconf);
+    ap_run_child_init(pmain, ap_server_conf);
+
+    if (ap_threads_max_free < ap_threads_min_free + 1)  /* Don't thrash... */
+        ap_threads_max_free = ap_threads_min_free + 1;
+    request_count = 0;
+
+    startup_workers(ap_threads_to_start);
+
+     /* Allow the Apache screen to be closed normally on exit() only if it
+        has not been explicitly forced to close on exit(). (ie. the -E flag
+        was specified at startup) */
+    if (hold_screen_on_exit > 0) {
+        hold_screen_on_exit = 0;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00224)
+            "%s configured -- resuming normal operations",
+            ap_get_server_description());
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00225)
+            "Server built: %s", ap_get_server_built());
+    ap_log_command_line(plog, s);
+    ap_log_mpm_common(s);
+    show_server_data();
+
+    mpm_state = AP_MPMQ_RUNNING;
+    while (!restart_pending && !shutdown_pending) {
+        perform_idle_server_maintenance(pconf);
+        if (show_settings)
+            display_settings();
+        apr_thread_yield();
+        apr_sleep(SCOREBOARD_MAINTENANCE_INTERVAL);
+    }
+    mpm_state = AP_MPMQ_STOPPING;
+
+    ap_run_child_status(ap_server_conf,
+                        ap_scoreboard_image->parent[0].pid,
+                        ap_my_generation,
+                        0,
+                        MPM_CHILD_EXITED);
+
+    /* Shutdown the listen sockets so that we don't get stuck in a blocking call.
+    shutdown_listeners();*/
+
+    if (shutdown_pending) { /* Got an unload from the console */
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00226)
+            "caught SIGTERM, shutting down");
+
+        while (worker_thread_count > 0) {
+            printf ("\rShutdown pending. Waiting for %lu thread(s) to terminate...",
+                    worker_thread_count);
+            apr_thread_yield();
+        }
+
+        mpm_main_cleanup();
+        return DONE;
+    }
+    else {  /* the only other way out is a restart */
+        /* advance to the next generation */
+        /* XXX: we really need to make sure this new generation number isn't in
+         * use by any of the children.
+         */
+        ++ap_my_generation;
+        ap_scoreboard_image->global->running_generation = ap_my_generation;
+
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00227)
+                "Graceful restart requested, doing restart");
+
+        /* Wait for all of the threads to terminate before initiating the restart */
+        while (worker_thread_count > 0) {
+            printf ("\rRestart pending. Waiting for %lu thread(s) to terminate...",
+                    worker_thread_count);
+            apr_thread_yield();
+        }
+        printf ("\nRestarting...\n");
+    }
+
+    mpm_main_cleanup();
+    return OK;
+}
+
+static int netware_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+    char *addrname = NULL;
+
+    mpm_state = AP_MPMQ_STARTING;
+
+    is_graceful = 0;
+    ap_my_pid = getpid();
+    addrname = getaddressspacename (NULL, NULL);
+    if (addrname) {
+        ap_my_addrspace = apr_pstrdup (p, addrname);
+        free (addrname);
+    }
+
+#ifndef USE_WINSOCK
+    /* The following call has been moved to the mod_nw_ssl pre-config handler */
+    ap_listen_pre_config();
+#endif
+
+    ap_threads_to_start = DEFAULT_START_THREADS;
+    ap_threads_min_free = DEFAULT_MIN_FREE_THREADS;
+    ap_threads_max_free = DEFAULT_MAX_FREE_THREADS;
+    ap_threads_limit = HARD_THREAD_LIMIT;
+    ap_extended_status = 0;
+
+    /* override core's default thread stacksize */
+    ap_thread_stacksize = DEFAULT_THREAD_STACKSIZE;
+
+    return OK;
+}
+
+static int netware_check_config(apr_pool_t *p, apr_pool_t *plog,
+                                apr_pool_t *ptemp, server_rec *s)
+{
+    static int restart_num = 0;
+    int startup = 0;
+
+    /* we want this only the first time around */
+    if (restart_num++ == 0) {
+        startup = 1;
+    }
+
+    if (ap_threads_limit > HARD_THREAD_LIMIT) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00228)
+                         "WARNING: MaxThreads of %d exceeds compile-time "
+                         "limit of %d threads, decreasing to %d. "
+                         "To increase, please see the HARD_THREAD_LIMIT "
+                         "define in server/mpm/netware%s.",
+                         ap_threads_limit, HARD_THREAD_LIMIT, HARD_THREAD_LIMIT,
+                         MPM_HARD_LIMITS_FILE);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00229)
+                         "MaxThreads of %d exceeds compile-time limit "
+                         "of %d, decreasing to match",
+                         ap_threads_limit, HARD_THREAD_LIMIT);
+        }
+        ap_threads_limit = HARD_THREAD_LIMIT;
+    }
+    else if (ap_threads_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00230)
+                         "WARNING: MaxThreads of %d not allowed, "
+                         "increasing to 1.", ap_threads_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(02661)
+                         "MaxThreads of %d not allowed, increasing to 1",
+                         ap_threads_limit);
+        }
+        ap_threads_limit = 1;
+    }
+
+    /* ap_threads_to_start > ap_threads_limit effectively checked in
+     * call to startup_workers(ap_threads_to_start) in ap_mpm_run()
+     */
+    if (ap_threads_to_start < 0) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00231)
+                         "WARNING: StartThreads of %d not allowed, "
+                         "increasing to 1.", ap_threads_to_start);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00232)
+                         "StartThreads of %d not allowed, increasing to 1",
+                         ap_threads_to_start);
+        }
+        ap_threads_to_start = 1;
+    }
+
+    if (ap_threads_min_free < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00233)
+                         "WARNING: MinSpareThreads of %d not allowed, "
+                         "increasing to 1 to avoid almost certain server failure. "
+                         "Please read the documentation.", ap_threads_min_free);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00234)
+                         "MinSpareThreads of %d not allowed, increasing to 1",
+                         ap_threads_min_free);
+        }
+        ap_threads_min_free = 1;
+    }
+
+    /* ap_threads_max_free < ap_threads_min_free + 1 checked in ap_mpm_run() */
+
+    return OK;
+}
+
+static void netware_mpm_hooks(apr_pool_t *p)
+{
+    /* Run the pre-config hook after core's so that it can override the
+     * default setting of ThreadStackSize for NetWare.
+     */
+    static const char * const predecessors[] = {"core.c", NULL};
+
+    ap_hook_pre_config(netware_pre_config, predecessors, NULL, APR_HOOK_MIDDLE);
+    ap_hook_check_config(netware_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+    //ap_hook_post_config(netware_post_config, NULL, NULL, 0);
+    //ap_hook_child_init(netware_child_init, NULL, NULL, APR_HOOK_MIDDLE);
+    //ap_hook_open_logs(netware_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
+    ap_hook_mpm(netware_run, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_query(netware_query, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_get_name(netware_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+static void netware_rewrite_args(process_rec *process)
+{
+    char *def_server_root;
+    char optbuf[3];
+    const char *opt_arg;
+    apr_getopt_t *opt;
+    apr_array_header_t *mpm_new_argv;
+
+
+    atexit (mpm_term);
+    InstallConsoleHandler();
+
+    /* Make sure to hold the Apache screen open if exit() is called */
+    hold_screen_on_exit = 1;
+
+    /* Rewrite process->argv[];
+     *
+     * add default -d serverroot from the path of this executable
+     *
+     * The end result will look like:
+     *     The -d serverroot default from the running executable
+     */
+    if (process->argc > 0) {
+        char *s = apr_pstrdup (process->pconf, process->argv[0]);
+        if (s) {
+            int i, len = strlen(s);
+
+            for (i=len; i; i--) {
+                if (s[i] == '\\' || s[i] == '/') {
+                    s[i] = '\0';
+                    apr_filepath_merge(&def_server_root, NULL, s,
+                        APR_FILEPATH_TRUENAME, process->pool);
+                    break;
+                }
+            }
+            /* Use process->pool so that the rewritten argv
+            * lasts for the lifetime of the server process,
+            * because pconf will be destroyed after the
+            * initial pre-flight of the config parser.
+            */
+            mpm_new_argv = apr_array_make(process->pool, process->argc + 2,
+                                  sizeof(const char *));
+            *(const char **)apr_array_push(mpm_new_argv) = process->argv[0];
+            *(const char **)apr_array_push(mpm_new_argv) = "-d";
+            *(const char **)apr_array_push(mpm_new_argv) = def_server_root;
+
+            optbuf[0] = '-';
+            optbuf[2] = '\0';
+            apr_getopt_init(&opt, process->pool, process->argc, process->argv);
+            while (apr_getopt(opt, AP_SERVER_BASEARGS"n:", optbuf + 1, &opt_arg) == APR_SUCCESS) {
+                switch (optbuf[1]) {
+                case 'n':
+                    if (opt_arg) {
+                        renamescreen(opt_arg);
+                    }
+                    break;
+                case 'E':
+                    /* Don't need to hold the screen open if the output is going to a file */
+                    hold_screen_on_exit = -1;
+                default:
+                    *(const char **)apr_array_push(mpm_new_argv) =
+                        apr_pstrdup(process->pool, optbuf);
+
+                    if (opt_arg) {
+                        *(const char **)apr_array_push(mpm_new_argv) = opt_arg;
+                    }
+                    break;
+                }
+            }
+            process->argc = mpm_new_argv->nelts;
+            process->argv = (const char * const *) mpm_new_argv->elts;
+        }
+    }
+}
+
+static int CommandLineInterpreter(scr_t screenID, const char *commandLine)
+{
+    char *szCommand = "APACHE2 ";
+    int iCommandLen = 8;
+    char szcommandLine[256];
+    char *pID;
+    screenID = screenID;
+
+
+    if (commandLine == NULL)
+        return NOTMYCOMMAND;
+    if (strlen(commandLine) <= strlen(szCommand))
+        return NOTMYCOMMAND;
+
+    apr_cpystrn(szcommandLine, commandLine, sizeof(szcommandLine));
+
+    /*  All added commands begin with "APACHE2 " */
+
+    if (!strnicmp(szCommand, szcommandLine, iCommandLen)) {
+        ActivateScreen (getscreenhandle());
+
+        /* If an instance id was not given but the nlm is loaded in
+            protected space, then the command belongs to the
+            OS address space instance to pass it on. */
+        pID = strstr (szcommandLine, "-p");
+        if ((pID == NULL) && nlmisloadedprotected())
+            return NOTMYCOMMAND;
+
+        /* If we got an instance id but it doesn't match this
+            instance of the nlm, pass it on. */
+        if (pID) {
+            pID = &pID[2];
+            while (*pID && (*pID == ' '))
+                pID++;
+        }
+        if (pID && ap_my_addrspace && strnicmp(pID, ap_my_addrspace, strlen(ap_my_addrspace)))
+            return NOTMYCOMMAND;
+
+        /* If we have determined that this command belongs to this
+            instance of the nlm, then handle it. */
+        if (!strnicmp("RESTART",&szcommandLine[iCommandLen],3)) {
+            printf("Restart Requested...\n");
+            restart();
+        }
+        else if (!strnicmp("VERSION",&szcommandLine[iCommandLen],3)) {
+            printf("Server version: %s\n", ap_get_server_description());
+            printf("Server built:   %s\n", ap_get_server_built());
+        }
+        else if (!strnicmp("MODULES",&szcommandLine[iCommandLen],3)) {
+            ap_show_modules();
+        }
+        else if (!strnicmp("DIRECTIVES",&szcommandLine[iCommandLen],3)) {
+                ap_show_directives();
+        }
+        else if (!strnicmp("SHUTDOWN",&szcommandLine[iCommandLen],3)) {
+            printf("Shutdown Requested...\n");
+            shutdown_pending = 1;
+        }
+        else if (!strnicmp("SETTINGS",&szcommandLine[iCommandLen],3)) {
+            if (show_settings) {
+                show_settings = 0;
+                ClearScreen (getscreenhandle());
+                show_server_data();
+            }
+            else {
+                show_settings = 1;
+                display_settings();
+            }
+        }
+        else {
+            show_settings = 0;
+            if (strnicmp("HELP",&szcommandLine[iCommandLen],3))
+                printf("Unknown APACHE2 command %s\n", &szcommandLine[iCommandLen]);
+            printf("Usage: APACHE2 [command] [-p <instance ID>]\n");
+            printf("Commands:\n");
+            printf("\tDIRECTIVES - Show directives\n");
+            printf("\tHELP       - Display this help information\n");
+            printf("\tMODULES    - Show a list of the loaded modules\n");
+            printf("\tRESTART    - Reread the configuration file and restart Apache\n");
+            printf("\tSETTINGS   - Show current thread status\n");
+            printf("\tSHUTDOWN   - Shutdown Apache\n");
+            printf("\tVERSION    - Display the server version information\n");
+        }
+
+        /*  Tell NetWare we handled the command */
+        return HANDLEDCOMMAND;
+    }
+
+    /*  Tell NetWare that the command isn't mine */
+    return NOTMYCOMMAND;
+}
+
+static int InstallConsoleHandler(void)
+{
+    /*  Our command line handler interfaces the system operator
+    with this NLM */
+
+    NX_WRAP_INTERFACE(CommandLineInterpreter, 2, (void*)&(ConsoleHandler.parser));
+
+    ConsoleHandler.rTag = AllocateResourceTag(getnlmhandle(), "Command Line Processor",
+        ConsoleCommandSignature);
+    if (!ConsoleHandler.rTag)
+    {
+        printf("Error on allocate resource tag\n");
+        return 1;
+    }
+
+    RegisterConsoleCommand(&ConsoleHandler);
+
+    /*  The Remove procedure unregisters the console handler */
+
+    return 0;
+}
+
+static void RemoveConsoleHandler(void)
+{
+    UnRegisterConsoleCommand(&ConsoleHandler);
+    NX_UNWRAP_INTERFACE(ConsoleHandler.parser);
+}
+
+static const char *set_threads_to_start(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_threads_to_start = atoi(arg);
+    return NULL;
+}
+
+static const char *set_min_free_threads(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_threads_min_free = atoi(arg);
+    return NULL;
+}
+
+static const char *set_max_free_threads(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_threads_max_free = atoi(arg);
+    return NULL;
+}
+
+static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_threads_limit = atoi(arg);
+    return NULL;
+}
+
+static const command_rec netware_mpm_cmds[] = {
+LISTEN_COMMANDS,
+AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF,
+              "Number of worker threads launched at server startup"),
+AP_INIT_TAKE1("MinSpareThreads", set_min_free_threads, NULL, RSRC_CONF,
+              "Minimum number of idle threads, to handle request spikes"),
+AP_INIT_TAKE1("MaxSpareThreads", set_max_free_threads, NULL, RSRC_CONF,
+              "Maximum number of idle threads"),
+AP_INIT_TAKE1("MaxThreads", set_thread_limit, NULL, RSRC_CONF,
+              "Maximum number of worker threads alive at the same time"),
+{ NULL }
+};
+
+AP_DECLARE_MODULE(mpm_netware) = {
+    MPM20_MODULE_STUFF,
+    netware_rewrite_args,   /* hook to run before apache parses args */
+    NULL,                   /* create per-directory config structure */
+    NULL,                   /* merge per-directory config structures */
+    NULL,                   /* create per-server config structure */
+    NULL,                   /* merge per-server config structures */
+    netware_mpm_cmds,       /* command apr_table_t */
+    netware_mpm_hooks,      /* register hooks */
+};
diff --git a/server/mpm/prefork/Makefile.in b/server/mpm/prefork/Makefile.in
new file mode 100644
index 0000000..f34af9c
--- /dev/null
+++ b/server/mpm/prefork/Makefile.in
@@ -0,0 +1 @@
+include $(top_srcdir)/build/special.mk
diff --git a/server/mpm/prefork/config.m4 b/server/mpm/prefork/config.m4
new file mode 100644
index 0000000..296f834
--- /dev/null
+++ b/server/mpm/prefork/config.m4
@@ -0,0 +1,7 @@
+AC_MSG_CHECKING(if prefork MPM supports this platform)
+if test $forking_mpms_supported != yes; then
+    AC_MSG_RESULT(no - This is not a forking platform)
+else
+    AC_MSG_RESULT(yes)
+    APACHE_MPM_SUPPORTED(prefork, yes, no)
+fi
diff --git a/server/mpm/prefork/config3.m4 b/server/mpm/prefork/config3.m4
new file mode 100644
index 0000000..25fd8df
--- /dev/null
+++ b/server/mpm/prefork/config3.m4
@@ -0,0 +1 @@
+APACHE_MPM_MODULE(prefork, $enable_mpm_prefork)
diff --git a/server/mpm/prefork/mpm_default.h b/server/mpm/prefork/mpm_default.h
new file mode 100644
index 0000000..55b038b
--- /dev/null
+++ b/server/mpm/prefork/mpm_default.h
@@ -0,0 +1,51 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file  prefork/mpm_default.h
+ * @brief Prefork MPM defaults
+ *
+ * @defgroup APACHE_MPM_PREFORK Prefork MPM
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Number of servers to spawn off by default --- also, if fewer than
+ * this free when the caretaker checks, it will spawn more.
+ */
+#ifndef DEFAULT_START_DAEMON
+#define DEFAULT_START_DAEMON 5
+#endif
+
+/* Maximum number of *free* server processes --- more than this, and
+ * they will die off.
+ */
+
+#ifndef DEFAULT_MAX_FREE_DAEMON
+#define DEFAULT_MAX_FREE_DAEMON 10
+#endif
+
+/* Minimum --- fewer than this, and more will be created */
+
+#ifndef DEFAULT_MIN_FREE_DAEMON
+#define DEFAULT_MIN_FREE_DAEMON 5
+#endif
+
+#endif /* AP_MPM_DEFAULT_H */
+/** @} */
diff --git a/server/mpm/prefork/prefork.c b/server/mpm/prefork/prefork.c
new file mode 100644
index 0000000..8efda72
--- /dev/null
+++ b/server/mpm/prefork/prefork.c
@@ -0,0 +1,1513 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr.h"
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+
+#define APR_WANT_STDIO
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "mpm_default.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h"
+#include "http_core.h"          /* for get_remote_host */
+#include "http_connection.h"
+#include "scoreboard.h"
+#include "ap_mpm.h"
+#include "util_mutex.h"
+#include "unixd.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "ap_mmn.h"
+#include "apr_poll.h"
+
+#include <stdlib.h>
+
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif
+#ifdef HAVE_SYS_PROCESSOR_H
+#include <sys/processor.h> /* for bindprocessor() */
+#endif
+
+#include <signal.h>
+#include <sys/times.h>
+
+/* Limit on the total --- clients will be locked out if more servers than
+ * this are needed.  It is intended solely to keep the server from crashing
+ * when things get out of hand.
+ *
+ * We keep a hard maximum number of servers, for two reasons --- first off,
+ * in case something goes seriously wrong, we want to stop the fork bomb
+ * short of actually crashing the machine we're running on by filling some
+ * kernel table.  Secondly, it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_SERVER_LIMIT
+#define DEFAULT_SERVER_LIMIT 256
+#endif
+
+/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT.  We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_SERVER_LIMIT
+#define MAX_SERVER_LIMIT 200000
+#endif
+
+#ifndef HARD_THREAD_LIMIT
+#define HARD_THREAD_LIMIT 1
+#endif
+
+/* config globals */
+
+static int ap_daemons_to_start=0;
+static int ap_daemons_min_free=0;
+static int ap_daemons_max_free=0;
+static int ap_daemons_limit=0;      /* MaxRequestWorkers */
+static int server_limit = 0;
+
+/* data retained by prefork across load/unload of the module
+ * allocated on first call to pre-config hook; located on
+ * subsequent calls to pre-config hook
+ */
+typedef struct prefork_retained_data {
+    ap_unixd_mpm_retained_data *mpm;
+
+    int first_server_limit;
+    int maxclients_reported;
+    /*
+     * The max child slot ever assigned, preserved across restarts.  Necessary
+     * to deal with MaxRequestWorkers changes across AP_SIG_GRACEFUL restarts.  We
+     * use this value to optimize routines that have to scan the entire scoreboard.
+     */
+    int max_daemons_limit;
+    /*
+     * idle_spawn_rate is the number of children that will be spawned on the
+     * next maintenance cycle if there aren't enough idle servers.  It is
+     * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
+     * without the need to spawn.
+     */
+    int idle_spawn_rate;
+#ifndef MAX_SPAWN_RATE
+#define MAX_SPAWN_RATE  (32)
+#endif
+    int hold_off_on_exponential_spawning;
+} prefork_retained_data;
+static prefork_retained_data *retained;
+
+typedef struct prefork_child_bucket {
+    ap_pod_t *pod;
+    ap_listen_rec *listeners;
+    apr_proc_mutex_t *mutex;
+} prefork_child_bucket;
+static prefork_child_bucket *all_buckets, /* All listeners buckets */
+                            *my_bucket;   /* Current child bucket */
+
+#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
+
+/* one_process --- debugging mode variable; can be set from the command line
+ * with the -X flag.  If set, this gets you the child_main loop running
+ * in the process which originally started up (no detach, no make_child),
+ * which is a pretty nice debugging environment.  (You'll get a SIGHUP
+ * early in standalone_main; just continue through.  This is the server
+ * trying to kill off any child processes which it might have lying
+ * around --- Apache doesn't keep track of their pids, it just sends
+ * SIGHUP to the process group, ignoring it in the root process.
+ * Continue through and you'll be fine.).
+ */
+
+static int one_process = 0;
+
+static apr_pool_t *pconf;               /* Pool for config stuff */
+static apr_pool_t *pchild;              /* Pool for httpd child stuff */
+
+static pid_t ap_my_pid; /* it seems silly to call getpid all the time */
+static pid_t parent_pid;
+static int my_child_num;
+
+#ifdef GPROF
+/*
+ * change directory for gprof to plop the gmon.out file
+ * configure in httpd.conf:
+ * GprofDir $RuntimeDir/   -> $ServerRoot/$RuntimeDir/gmon.out
+ * GprofDir $RuntimeDir/%  -> $ServerRoot/$RuntimeDir/gprof.$pid/gmon.out
+ */
+static void chdir_for_gprof(void)
+{
+    core_server_config *sconf =
+        ap_get_core_module_config(ap_server_conf->module_config);
+    char *dir = sconf->gprof_dir;
+    const char *use_dir;
+
+    if(dir) {
+        apr_status_t res;
+        char *buf = NULL ;
+        int len = strlen(sconf->gprof_dir) - 1;
+        if(*(dir + len) == '%') {
+            dir[len] = '\0';
+            buf = ap_append_pid(pconf, dir, "gprof.");
+        }
+        use_dir = ap_server_root_relative(pconf, buf ? buf : dir);
+        res = apr_dir_make(use_dir,
+                           APR_UREAD | APR_UWRITE | APR_UEXECUTE |
+                           APR_GREAD | APR_GEXECUTE |
+                           APR_WREAD | APR_WEXECUTE, pconf);
+        if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, res, ap_server_conf, APLOGNO(00142)
+                         "gprof: error creating directory %s", dir);
+        }
+    }
+    else {
+        use_dir = ap_runtime_dir_relative(pconf, "");
+    }
+
+    chdir(use_dir);
+}
+#else
+#define chdir_for_gprof()
+#endif
+
+static void prefork_note_child_killed(int childnum, pid_t pid,
+                                      ap_generation_t gen)
+{
+    AP_DEBUG_ASSERT(childnum != -1); /* no scoreboard squatting with this MPM */
+    ap_run_child_status(ap_server_conf,
+                        ap_scoreboard_image->parent[childnum].pid,
+                        ap_scoreboard_image->parent[childnum].generation,
+                        childnum, MPM_CHILD_EXITED);
+    ap_scoreboard_image->parent[childnum].pid = 0;
+}
+
+static void prefork_note_child_started(int slot, pid_t pid)
+{
+    ap_generation_t gen = retained->mpm->my_generation;
+    ap_scoreboard_image->parent[slot].pid = pid;
+    ap_scoreboard_image->parent[slot].generation = gen;
+    ap_run_child_status(ap_server_conf, pid, gen, slot, MPM_CHILD_STARTED);
+}
+
+/* a clean exit from a child with proper cleanup */
+static void clean_child_exit(int code) __attribute__ ((noreturn));
+static void clean_child_exit(int code)
+{
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+
+    apr_signal(SIGHUP, SIG_IGN);
+    apr_signal(SIGTERM, SIG_IGN);
+
+    if (pchild) {
+        apr_pool_destroy(pchild);
+    }
+
+    if (one_process) {
+        prefork_note_child_killed(/* slot */ 0, 0, 0);
+    }
+
+    ap_mpm_pod_close(my_bucket->pod);
+    chdir_for_gprof();
+    exit(code);
+}
+
+static apr_status_t accept_mutex_on(void)
+{
+    apr_status_t rv = apr_proc_mutex_lock(my_bucket->mutex);
+    if (rv != APR_SUCCESS) {
+        const char *msg = "couldn't grab the accept mutex";
+
+        if (retained->mpm->my_generation !=
+            ap_scoreboard_image->global->running_generation) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00143) "%s", msg);
+            clean_child_exit(0);
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00144) "%s", msg);
+            exit(APEXIT_CHILDFATAL);
+        }
+    }
+    return APR_SUCCESS;
+}
+
+static apr_status_t accept_mutex_off(void)
+{
+    apr_status_t rv = apr_proc_mutex_unlock(my_bucket->mutex);
+    if (rv != APR_SUCCESS) {
+        const char *msg = "couldn't release the accept mutex";
+
+        if (retained->mpm->my_generation !=
+            ap_scoreboard_image->global->running_generation) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00145) "%s", msg);
+            /* don't exit here... we have a connection to
+             * process, after which point we'll see that the
+             * generation changed and we'll exit cleanly
+             */
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00146) "%s", msg);
+            exit(APEXIT_CHILDFATAL);
+        }
+    }
+    return APR_SUCCESS;
+}
+
+/* On some architectures it's safe to do unserialized accept()s in the single
+ * Listen case.  But it's never safe to do it in the case where there's
+ * multiple Listen statements.  Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+ * when it's safe in the single Listen case.
+ */
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+#define SAFE_ACCEPT(stmt) (ap_listeners->next ? (stmt) : APR_SUCCESS)
+#else
+#define SAFE_ACCEPT(stmt) (stmt)
+#endif
+
+static int prefork_query(int query_code, int *result, apr_status_t *rv)
+{
+    *rv = APR_SUCCESS;
+    switch(query_code){
+    case AP_MPMQ_MAX_DAEMON_USED:
+        *result = ap_daemons_limit;
+        break;
+    case AP_MPMQ_IS_THREADED:
+        *result = AP_MPMQ_NOT_SUPPORTED;
+        break;
+    case AP_MPMQ_IS_FORKED:
+        *result = AP_MPMQ_DYNAMIC;
+        break;
+    case AP_MPMQ_HARD_LIMIT_DAEMONS:
+        *result = server_limit;
+        break;
+    case AP_MPMQ_HARD_LIMIT_THREADS:
+        *result = HARD_THREAD_LIMIT;
+        break;
+    case AP_MPMQ_MAX_THREADS:
+        *result = 1;
+        break;
+    case AP_MPMQ_MIN_SPARE_DAEMONS:
+        *result = ap_daemons_min_free;
+        break;
+    case AP_MPMQ_MIN_SPARE_THREADS:
+        *result = 0;
+        break;
+    case AP_MPMQ_MAX_SPARE_DAEMONS:
+        *result = ap_daemons_max_free;
+        break;
+    case AP_MPMQ_MAX_SPARE_THREADS:
+        *result = 0;
+        break;
+    case AP_MPMQ_MAX_REQUESTS_DAEMON:
+        *result = ap_max_requests_per_child;
+        break;
+    case AP_MPMQ_MAX_DAEMONS:
+        *result = ap_daemons_limit;
+        break;
+    case AP_MPMQ_MPM_STATE:
+        *result = retained->mpm->mpm_state;
+        break;
+    case AP_MPMQ_GENERATION:
+        *result = retained->mpm->my_generation;
+        break;
+    default:
+        *rv = APR_ENOTIMPL;
+        break;
+    }
+    return OK;
+}
+
+static const char *prefork_get_name(void)
+{
+    return "prefork";
+}
+
+/*****************************************************************
+ * Connection structures and accounting...
+ */
+
+static void just_die(int sig)
+{
+    clean_child_exit(0);
+}
+
+/* volatile because it's updated from a signal handler */
+static int volatile die_now = 0;
+
+static void stop_listening(int sig)
+{
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+    ap_close_listeners_ex(my_bucket->listeners);
+
+    /* For a graceful stop, we want the child to exit when done */
+    die_now = 1;
+}
+
+/*****************************************************************
+ * Child process main loop.
+ * The following vars are static to avoid getting clobbered by longjmp();
+ * they are really private to child_main.
+ */
+
+static int requests_this_child;
+static int num_listensocks = 0;
+
+static void child_main(int child_num_arg, int child_bucket)
+{
+#if APR_HAS_THREADS
+    apr_thread_t *thd = NULL;
+    apr_os_thread_t osthd;
+#endif
+    apr_pool_t *ptrans;
+    apr_allocator_t *allocator;
+    apr_status_t status;
+    int i;
+    ap_listen_rec *lr;
+    apr_pollset_t *pollset;
+    ap_sb_handle_t *sbh;
+    apr_bucket_alloc_t *bucket_alloc;
+    int last_poll_idx = 0;
+    const char *lockfile;
+
+    /* for benefit of any hooks that run as this child initializes */
+    retained->mpm->mpm_state = AP_MPMQ_STARTING;
+
+    my_child_num = child_num_arg;
+    ap_my_pid = getpid();
+    requests_this_child = 0;
+
+    ap_fatal_signal_child_setup(ap_server_conf);
+
+    /* Get a sub context for global allocations in this child, so that
+     * we can have cleanups occur when the child exits.
+     */
+    apr_allocator_create(&allocator);
+    apr_allocator_max_free_set(allocator, ap_max_mem_free);
+    apr_pool_create_ex(&pchild, pconf, NULL, allocator);
+    apr_allocator_owner_set(allocator, pchild);
+    apr_pool_tag(pchild, "pchild");
+
+#if APR_HAS_THREADS
+    osthd = apr_os_thread_current();
+    apr_os_thread_put(&thd, &osthd, pchild);
+#endif
+
+    apr_pool_create(&ptrans, pchild);
+    apr_pool_tag(ptrans, "transaction");
+
+    /* close unused listeners and pods */
+    for (i = 0; i < retained->mpm->num_buckets; i++) {
+        if (i != child_bucket) {
+            ap_close_listeners_ex(all_buckets[i].listeners);
+            ap_mpm_pod_close(all_buckets[i].pod);
+        }
+    }
+
+    /* needs to be done before we switch UIDs so we have permissions */
+    ap_reopen_scoreboard(pchild, NULL, 0);
+    status = SAFE_ACCEPT(apr_proc_mutex_child_init(&my_bucket->mutex,
+                                    apr_proc_mutex_lockfile(my_bucket->mutex),
+                                    pchild));
+    if (status != APR_SUCCESS) {
+        lockfile = apr_proc_mutex_lockfile(my_bucket->mutex);
+        ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00155)
+                     "Couldn't initialize cross-process lock in child "
+                     "(%s) (%s)",
+                     lockfile ? lockfile : "none",
+                     apr_proc_mutex_name(my_bucket->mutex));
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    if (ap_run_drop_privileges(pchild, ap_server_conf)) {
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    ap_run_child_init(pchild, ap_server_conf);
+
+    ap_create_sb_handle(&sbh, pchild, my_child_num, 0);
+
+    (void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
+
+    /* Set up the pollfd array */
+    status = apr_pollset_create(&pollset, num_listensocks, pchild,
+                                APR_POLLSET_NOCOPY);
+    if (status != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00156)
+                     "Couldn't create pollset in child; check system or user limits");
+        clean_child_exit(APEXIT_CHILDSICK); /* assume temporary resource issue */
+    }
+
+    for (lr = my_bucket->listeners, i = num_listensocks; i--; lr = lr->next) {
+        apr_pollfd_t *pfd = apr_pcalloc(pchild, sizeof *pfd);
+
+        pfd->desc_type = APR_POLL_SOCKET;
+        pfd->desc.s = lr->sd;
+        pfd->reqevents = APR_POLLIN;
+        pfd->client_data = lr;
+
+        status = apr_pollset_add(pollset, pfd);
+        if (status != APR_SUCCESS) {
+            /* If the child processed a SIGWINCH before setting up the
+             * pollset, this error path is expected and harmless,
+             * since the listener fd was already closed; so don't
+             * pollute the logs in that case. */
+            if (!die_now) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00157)
+                             "Couldn't add listener to pollset; check system or user limits");
+                clean_child_exit(APEXIT_CHILDSICK);
+            }
+            clean_child_exit(0);
+        }
+
+        lr->accept_func = ap_unixd_accept;
+    }
+
+    retained->mpm->mpm_state = AP_MPMQ_RUNNING;
+
+    bucket_alloc = apr_bucket_alloc_create(pchild);
+
+    /* die_now is set when AP_SIG_GRACEFUL is received in the child;
+     * {shutdown,restart}_pending are set when a signal is received while
+     * running in single process mode.
+     */
+    while (!die_now
+           && !retained->mpm->shutdown_pending
+           && !retained->mpm->restart_pending) {
+        conn_rec *current_conn;
+        void *csd;
+
+        /*
+         * (Re)initialize this child to a pre-connection state.
+         */
+
+        apr_pool_clear(ptrans);
+
+        if ((ap_max_requests_per_child > 0
+             && requests_this_child++ >= ap_max_requests_per_child)) {
+            clean_child_exit(0);
+        }
+
+        (void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
+
+        /*
+         * Wait for an acceptable connection to arrive.
+         */
+
+        /* Lock around "accept", if necessary */
+        SAFE_ACCEPT(accept_mutex_on());
+
+        if (num_listensocks == 1) {
+            /* There is only one listener record, so refer to that one. */
+            lr = my_bucket->listeners;
+        }
+        else {
+            /* multiple listening sockets - need to poll */
+            for (;;) {
+                apr_int32_t numdesc;
+                const apr_pollfd_t *pdesc;
+
+                /* check for termination first so we don't sleep for a while in
+                 * poll if already signalled
+                 */
+                if (die_now         /* in graceful stop/restart */
+                        || retained->mpm->shutdown_pending
+                        || retained->mpm->restart_pending) {
+                    SAFE_ACCEPT(accept_mutex_off());
+                    clean_child_exit(0);
+                }
+
+                /* timeout == 10 seconds to avoid a hang at graceful restart/stop
+                 * caused by the closing of sockets by the signal handler
+                 */
+                status = apr_pollset_poll(pollset, apr_time_from_sec(10),
+                                          &numdesc, &pdesc);
+                if (status != APR_SUCCESS) {
+                    if (APR_STATUS_IS_TIMEUP(status) ||
+                        APR_STATUS_IS_EINTR(status)) {
+                        continue;
+                    }
+                    /* Single Unix documents select as returning errnos
+                     * EBADF, EINTR, and EINVAL... and in none of those
+                     * cases does it make sense to continue.  In fact
+                     * on Linux 2.0.x we seem to end up with EFAULT
+                     * occasionally, and we'd loop forever due to it.
+                     */
+                    ap_log_error(APLOG_MARK, APLOG_ERR, status,
+                                 ap_server_conf, APLOGNO(00158) "apr_pollset_poll: (listen)");
+                    SAFE_ACCEPT(accept_mutex_off());
+                    clean_child_exit(APEXIT_CHILDSICK);
+                }
+
+                /* We can always use pdesc[0], but sockets at position N
+                 * could end up completely starved of attention in a very
+                 * busy server. Therefore, we round-robin across the
+                 * returned set of descriptors. While it is possible that
+                 * the returned set of descriptors might flip around and
+                 * continue to starve some sockets, we happen to know the
+                 * internal pollset implementation retains ordering
+                 * stability of the sockets. Thus, the round-robin should
+                 * ensure that a socket will eventually be serviced.
+                 */
+                if (last_poll_idx >= numdesc)
+                    last_poll_idx = 0;
+
+                /* Grab a listener record from the client_data of the poll
+                 * descriptor, and advance our saved index to round-robin
+                 * the next fetch.
+                 *
+                 * ### hmm... this descriptor might have POLLERR rather
+                 * ### than POLLIN
+                 */
+                lr = pdesc[last_poll_idx++].client_data;
+                goto got_fd;
+            }
+        }
+    got_fd:
+        /* if we accept() something we don't want to die, so we have to
+         * defer the exit
+         */
+        status = lr->accept_func(&csd, lr, ptrans);
+
+        SAFE_ACCEPT(accept_mutex_off());      /* unlock after "accept" */
+
+        if (status == APR_EGENERAL) {
+            /* resource shortage or should-not-occur occurred */
+            clean_child_exit(APEXIT_CHILDSICK);
+        }
+        else if (status != APR_SUCCESS) {
+            continue;
+        }
+
+        /*
+         * We now have a connection, so set it up with the appropriate
+         * socket options, file descriptors, and read/write buffers.
+         */
+
+        current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd, my_child_num, sbh, bucket_alloc);
+        if (current_conn) {
+#if APR_HAS_THREADS
+            current_conn->current_thread = thd;
+#endif
+            ap_process_connection(current_conn, csd);
+            ap_lingering_close(current_conn);
+        }
+
+        /* Check the pod and the generation number after processing a
+         * connection so that we'll go away if a graceful restart occurred
+         * while we were processing the connection or we are the lucky
+         * idle server process that gets to die.
+         */
+        if (ap_mpm_pod_check(my_bucket->pod) == APR_SUCCESS) { /* selected as idle? */
+            die_now = 1;
+        }
+        else if (retained->mpm->my_generation !=
+                 ap_scoreboard_image->global->running_generation) { /* restart? */
+            /* yeah, this could be non-graceful restart, in which case the
+             * parent will kill us soon enough, but why bother checking?
+             */
+            die_now = 1;
+        }
+    }
+    apr_pool_clear(ptrans); /* kludge to avoid crash in APR reslist cleanup code */
+    clean_child_exit(0);
+}
+
+
+static int make_child(server_rec *s, int slot, int bucket)
+{
+    int pid;
+
+    if (slot + 1 > retained->max_daemons_limit) {
+        retained->max_daemons_limit = slot + 1;
+    }
+
+    if (one_process) {
+        my_bucket = &all_buckets[0];
+
+        prefork_note_child_started(slot, getpid());
+        child_main(slot, 0);
+        /* NOTREACHED */
+        ap_assert(0);
+        return -1;
+    }
+
+    (void) ap_update_child_status_from_indexes(slot, 0, SERVER_STARTING,
+                                               (request_rec *) NULL);
+
+#ifdef _OSD_POSIX
+    /* BS2000 requires a "special" version of fork() before a setuid() call */
+    if ((pid = os_fork(ap_unixd_config.user_name)) == -1) {
+#else
+    if ((pid = fork()) == -1) {
+#endif
+        ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, APLOGNO(00159) "fork: Unable to fork new process");
+
+        /* fork didn't succeed. Fix the scoreboard or else
+         * it will say SERVER_STARTING forever and ever
+         */
+        (void) ap_update_child_status_from_indexes(slot, 0, SERVER_DEAD,
+                                                   (request_rec *) NULL);
+
+        /* In case system resources are maxxed out, we don't want
+         * Apache running away with the CPU trying to fork over and
+         * over and over again.
+         */
+        sleep(10);
+
+        return -1;
+    }
+
+    if (!pid) {
+        my_bucket = &all_buckets[bucket];
+
+#ifdef HAVE_BINDPROCESSOR
+        /* by default AIX binds to a single processor
+         * this bit unbinds children which will then bind to another cpu
+         */
+        int status = bindprocessor(BINDPROCESS, (int)getpid(),
+                                   PROCESSOR_CLASS_ANY);
+        if (status != OK) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, errno,
+                         ap_server_conf, APLOGNO(00160) "processor unbind failed");
+        }
+#endif
+        RAISE_SIGSTOP(MAKE_CHILD);
+        AP_MONCONTROL(1);
+        /* Disable the parent's signal handlers and set up proper handling in
+         * the child.
+         */
+        apr_signal(SIGHUP, just_die);
+        apr_signal(SIGTERM, just_die);
+        /* Ignore SIGINT in child. This fixes race-condition in signals
+         * handling when httpd is runnning on foreground and user hits ctrl+c.
+         * In this case, SIGINT is sent to all children followed by SIGTERM
+         * from the main process, which interrupts the SIGINT handler and
+         * leads to inconsistency.
+         */
+        apr_signal(SIGINT, SIG_IGN);
+        /* The child process just closes listeners on AP_SIG_GRACEFUL.
+         * The pod is used for signalling the graceful restart.
+         */
+        apr_signal(AP_SIG_GRACEFUL, stop_listening);
+        child_main(slot, bucket);
+    }
+
+    ap_scoreboard_image->parent[slot].bucket = bucket;
+    prefork_note_child_started(slot, pid);
+
+    return 0;
+}
+
+
+/* start up a bunch of children */
+static void startup_children(int number_to_start)
+{
+    int i;
+
+    for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
+        if (ap_scoreboard_image->servers[i][0].status != SERVER_DEAD) {
+            continue;
+        }
+        if (make_child(ap_server_conf, i, i % retained->mpm->num_buckets) < 0) {
+            break;
+        }
+        --number_to_start;
+    }
+}
+
+static void perform_idle_server_maintenance(apr_pool_t *p)
+{
+    static int bucket_make_child_record = -1;
+    static int bucket_kill_child_record = -1;
+    int i;
+    int idle_count;
+    worker_score *ws;
+    int free_length;
+    int free_slots[MAX_SPAWN_RATE];
+    int last_non_dead;
+    int total_non_dead;
+
+    /* initialize the free_list */
+    free_length = 0;
+
+    idle_count = 0;
+    last_non_dead = -1;
+    total_non_dead = 0;
+
+    for (i = 0; i < ap_daemons_limit; ++i) {
+        int status;
+
+        if (i >= retained->max_daemons_limit && free_length == retained->idle_spawn_rate)
+            break;
+        ws = &ap_scoreboard_image->servers[i][0];
+        status = ws->status;
+        if (status == SERVER_DEAD) {
+            /* try to keep children numbers as low as possible */
+            if (free_length < retained->idle_spawn_rate) {
+                free_slots[free_length] = i;
+                ++free_length;
+            }
+        }
+        else {
+            /* We consider a starting server as idle because we started it
+             * at least a cycle ago, and if it still hasn't finished starting
+             * then we're just going to swamp things worse by forking more.
+             * So we hopefully won't need to fork more if we count it.
+             * This depends on the ordering of SERVER_READY and SERVER_STARTING.
+             */
+            if (status <= SERVER_READY) {
+                ++ idle_count;
+            }
+
+            ++total_non_dead;
+            last_non_dead = i;
+        }
+    }
+    retained->max_daemons_limit = last_non_dead + 1;
+    if (idle_count > ap_daemons_max_free) {
+        /* kill off one child... we use the pod because that'll cause it to
+         * shut down gracefully, in case it happened to pick up a request
+         * while we were counting
+         */
+        bucket_kill_child_record = (bucket_kill_child_record + 1) % retained->mpm->num_buckets;
+        ap_mpm_pod_signal(all_buckets[bucket_kill_child_record].pod);
+        retained->idle_spawn_rate = 1;
+    }
+    else if (idle_count < ap_daemons_min_free) {
+        /* terminate the free list */
+        if (free_length == 0) {
+            /* only report this condition once */
+            if (!retained->maxclients_reported) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00161)
+                            "server reached MaxRequestWorkers setting, consider"
+                            " raising the MaxRequestWorkers setting");
+                retained->maxclients_reported = 1;
+            }
+            retained->idle_spawn_rate = 1;
+        }
+        else {
+            if (retained->idle_spawn_rate >= 8) {
+                ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00162)
+                    "server seems busy, (you may need "
+                    "to increase StartServers, or Min/MaxSpareServers), "
+                    "spawning %d children, there are %d idle, and "
+                    "%d total children", retained->idle_spawn_rate,
+                    idle_count, total_non_dead);
+            }
+            for (i = 0; i < free_length; ++i) {
+                bucket_make_child_record++;
+                bucket_make_child_record %= retained->mpm->num_buckets;
+                make_child(ap_server_conf, free_slots[i],
+                           bucket_make_child_record);
+            }
+            /* the next time around we want to spawn twice as many if this
+             * wasn't good enough, but not if we've just done a graceful
+             */
+            if (retained->hold_off_on_exponential_spawning) {
+                --retained->hold_off_on_exponential_spawning;
+            }
+            else if (retained->idle_spawn_rate < MAX_SPAWN_RATE) {
+                retained->idle_spawn_rate *= 2;
+            }
+        }
+    }
+    else {
+        retained->idle_spawn_rate = 1;
+    }
+}
+
+/*****************************************************************
+ * Executive routines.
+ */
+
+static int prefork_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
+{
+    int index;
+    int remaining_children_to_start;
+    int i;
+
+    ap_log_pid(pconf, ap_pid_fname);
+
+    if (!retained->mpm->was_graceful) {
+        if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+            retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+            return !OK;
+        }
+        /* fix the generation number in the global score; we just got a new,
+         * cleared scoreboard
+         */
+        ap_scoreboard_image->global->running_generation = retained->mpm->my_generation;
+    }
+
+    ap_unixd_mpm_set_signals(pconf, one_process);
+
+    if (one_process) {
+        AP_MONCONTROL(1);
+        make_child(ap_server_conf, 0, 0);
+        /* NOTREACHED */
+        ap_assert(0);
+        return !OK;
+    }
+
+    /* Don't thrash since num_buckets depends on the
+     * system and the number of online CPU cores...
+     */
+    if (ap_daemons_limit < retained->mpm->num_buckets)
+        ap_daemons_limit = retained->mpm->num_buckets;
+    if (ap_daemons_to_start < retained->mpm->num_buckets)
+        ap_daemons_to_start = retained->mpm->num_buckets;
+    if (ap_daemons_min_free < retained->mpm->num_buckets)
+        ap_daemons_min_free = retained->mpm->num_buckets;
+    if (ap_daemons_max_free < ap_daemons_min_free + retained->mpm->num_buckets)
+        ap_daemons_max_free = ap_daemons_min_free + retained->mpm->num_buckets;
+
+    /* If we're doing a graceful_restart then we're going to see a lot
+     * of children exiting immediately when we get into the main loop
+     * below (because we just sent them AP_SIG_GRACEFUL).  This happens pretty
+     * rapidly... and for each one that exits we'll start a new one until
+     * we reach at least daemons_min_free.  But we may be permitted to
+     * start more than that, so we'll just keep track of how many we're
+     * supposed to start up without the 1 second penalty between each fork.
+     */
+    remaining_children_to_start = ap_daemons_to_start;
+    if (remaining_children_to_start > ap_daemons_limit) {
+        remaining_children_to_start = ap_daemons_limit;
+    }
+    if (!retained->mpm->was_graceful) {
+        startup_children(remaining_children_to_start);
+        remaining_children_to_start = 0;
+    }
+    else {
+        /* give the system some time to recover before kicking into
+         * exponential mode
+         */
+        retained->hold_off_on_exponential_spawning = 10;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00163)
+                "%s configured -- resuming normal operations",
+                ap_get_server_description());
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00164)
+                "Server built: %s", ap_get_server_built());
+    ap_log_command_line(plog, s);
+    ap_log_mpm_common(s);
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00165)
+                "Accept mutex: %s (default: %s)",
+                (all_buckets[0].mutex)
+                    ? apr_proc_mutex_name(all_buckets[0].mutex)
+                    : "none",
+                apr_proc_mutex_defname());
+
+    retained->mpm->mpm_state = AP_MPMQ_RUNNING;
+
+    while (!retained->mpm->restart_pending && !retained->mpm->shutdown_pending) {
+        int child_slot;
+        apr_exit_why_e exitwhy;
+        int status, processed_status;
+        /* this is a memory leak, but I'll fix it later. */
+        apr_proc_t pid;
+
+        ap_wait_or_timeout(&exitwhy, &status, &pid, pconf, ap_server_conf);
+
+        /* XXX: if it takes longer than 1 second for all our children
+         * to start up and get into IDLE state then we may spawn an
+         * extra child
+         */
+        if (pid.pid != -1) {
+            processed_status = ap_process_child_status(&pid, exitwhy, status);
+            child_slot = ap_find_child_by_pid(&pid);
+            if (processed_status == APEXIT_CHILDFATAL) {
+                /* fix race condition found in PR 39311
+                 * A child created at the same time as a graceful happens 
+                 * can find the lock missing and create a fatal error.
+                 * It is not fatal for the last generation to be in this state.
+                 */
+                if (child_slot < 0
+                    || ap_get_scoreboard_process(child_slot)->generation
+                       == retained->mpm->my_generation) {
+                    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+                    return !OK;
+                }
+                else {
+                    ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00166)
+                                 "Ignoring fatal error in child of previous "
+                                 "generation (pid %ld).",
+                                 (long)pid.pid);
+                }
+            }
+
+            /* non-fatal death... note that it's gone in the scoreboard. */
+            if (child_slot >= 0) {
+                (void) ap_update_child_status_from_indexes(child_slot, 0, SERVER_DEAD,
+                                                           (request_rec *) NULL);
+                prefork_note_child_killed(child_slot, 0, 0);
+                if (processed_status == APEXIT_CHILDSICK) {
+                    /* child detected a resource shortage (E[NM]FILE, ENOBUFS, etc)
+                     * cut the fork rate to the minimum
+                     */
+                    retained->idle_spawn_rate = 1;
+                }
+                else if (remaining_children_to_start
+                    && child_slot < ap_daemons_limit) {
+                    /* we're still doing a 1-for-1 replacement of dead
+                     * children with new children
+                     */
+                    make_child(ap_server_conf, child_slot,
+                               ap_get_scoreboard_process(child_slot)->bucket);
+                    --remaining_children_to_start;
+                }
+#if APR_HAS_OTHER_CHILD
+            }
+            else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH, status) == APR_SUCCESS) {
+                /* handled */
+#endif
+            }
+            else if (retained->mpm->was_graceful) {
+                /* Great, we've probably just lost a slot in the
+                 * scoreboard.  Somehow we don't know about this
+                 * child.
+                 */
+                ap_log_error(APLOG_MARK, APLOG_WARNING,
+                            0, ap_server_conf, APLOGNO(00167)
+                            "long lost child came home! (pid %ld)", (long)pid.pid);
+            }
+            /* Don't perform idle maintenance when a child dies,
+             * only do it when there's a timeout.  Remember only a
+             * finite number of children can die, and it's pretty
+             * pathological for a lot to die suddenly.
+             */
+            continue;
+        }
+        else if (remaining_children_to_start) {
+            /* we hit a 1 second timeout in which none of the previous
+             * generation of children needed to be reaped... so assume
+             * they're all done, and pick up the slack if any is left.
+             */
+            startup_children(remaining_children_to_start);
+            remaining_children_to_start = 0;
+            /* In any event we really shouldn't do the code below because
+             * few of the servers we just started are in the IDLE state
+             * yet, so we'd mistakenly create an extra server.
+             */
+            continue;
+        }
+
+        perform_idle_server_maintenance(pconf);
+    }
+
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+
+    if (retained->mpm->shutdown_pending && retained->mpm->is_ungraceful) {
+        /* Time to shut down:
+         * Kill child processes, tell them to call child_exit, etc...
+         */
+        if (ap_unixd_killpg(getpgrp(), SIGTERM) < 0) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00168) "killpg SIGTERM");
+        }
+        ap_reclaim_child_processes(1, /* Start with SIGTERM */
+                                   prefork_note_child_killed);
+
+        /* cleanup pid file on normal shutdown */
+        ap_remove_pid(pconf, ap_pid_fname);
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00169)
+                    "caught SIGTERM, shutting down");
+
+        return DONE;
+    }
+
+    if (retained->mpm->shutdown_pending) {
+        /* Time to perform a graceful shut down:
+         * Reap the inactive children, and ask the active ones
+         * to close their listeners, then wait until they are
+         * all done to exit.
+         */
+        int active_children;
+        apr_time_t cutoff = 0;
+
+        /* Stop listening */
+        ap_close_listeners();
+
+        /* kill off the idle ones */
+        for (i = 0; i < retained->mpm->num_buckets; i++) {
+            ap_mpm_pod_killpg(all_buckets[i].pod, retained->max_daemons_limit);
+        }
+
+        /* Send SIGUSR1 to the active children */
+        active_children = 0;
+        for (index = 0; index < ap_daemons_limit; ++index) {
+            if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
+                /* Ask each child to close its listeners. */
+                ap_mpm_safe_kill(MPM_CHILD_PID(index), AP_SIG_GRACEFUL);
+                active_children++;
+            }
+        }
+
+        /* Allow each child which actually finished to exit */
+        ap_relieve_child_processes(prefork_note_child_killed);
+
+        /* cleanup pid file */
+        ap_remove_pid(pconf, ap_pid_fname);
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00170)
+           "caught " AP_SIG_GRACEFUL_STOP_STRING ", shutting down gracefully");
+
+        if (ap_graceful_shutdown_timeout) {
+            cutoff = apr_time_now() +
+                     apr_time_from_sec(ap_graceful_shutdown_timeout);
+        }
+
+        /* Don't really exit until each child has finished */
+        retained->mpm->shutdown_pending = 0;
+        do {
+            /* Pause for a second */
+            sleep(1);
+
+            /* Relieve any children which have now exited */
+            ap_relieve_child_processes(prefork_note_child_killed);
+
+            active_children = 0;
+            for (index = 0; index < ap_daemons_limit; ++index) {
+                if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
+                    active_children = 1;
+                    /* Having just one child is enough to stay around */
+                    break;
+                }
+            }
+        } while (!retained->mpm->shutdown_pending && active_children &&
+                 (!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
+
+        /* We might be here because we received SIGTERM, either
+         * way, try and make sure that all of our processes are
+         * really dead.
+         */
+        ap_unixd_killpg(getpgrp(), SIGTERM);
+
+        return DONE;
+    }
+
+    /* we've been told to restart */
+    if (one_process) {
+        /* not worth thinking about */
+        return DONE;
+    }
+
+    /* advance to the next generation */
+    /* XXX: we really need to make sure this new generation number isn't in
+     * use by any of the children.
+     */
+    ++retained->mpm->my_generation;
+    ap_scoreboard_image->global->running_generation = retained->mpm->my_generation;
+
+    if (!retained->mpm->is_ungraceful) {
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00171)
+                    "Graceful restart requested, doing restart");
+
+        /* kill off the idle ones */
+        for (i = 0; i < retained->mpm->num_buckets; i++) {
+            ap_mpm_pod_killpg(all_buckets[i].pod, retained->max_daemons_limit);
+        }
+
+        /* This is mostly for debugging... so that we know what is still
+         * gracefully dealing with existing request.  This will break
+         * in a very nasty way if we ever have the scoreboard totally
+         * file-based (no shared memory)
+         */
+        for (index = 0; index < ap_daemons_limit; ++index) {
+            if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
+                ap_scoreboard_image->servers[index][0].status = SERVER_GRACEFUL;
+                /* Ask each child to close its listeners.
+                 *
+                 * NOTE: we use the scoreboard, because if we send SIGUSR1
+                 * to every process in the group, this may include CGI's,
+                 * piped loggers, etc. They almost certainly won't handle
+                 * it gracefully.
+                 */
+                ap_mpm_safe_kill(ap_scoreboard_image->parent[index].pid, AP_SIG_GRACEFUL);
+            }
+        }
+    }
+    else {
+        /* Kill 'em off */
+        if (ap_unixd_killpg(getpgrp(), SIGHUP) < 0) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00172) "killpg SIGHUP");
+        }
+        ap_reclaim_child_processes(0, /* Not when just starting up */
+                                   prefork_note_child_killed);
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00173)
+                    "SIGHUP received.  Attempting to restart");
+    }
+
+    return OK;
+}
+
+/* This really should be a post_config hook, but the error log is already
+ * redirected by that point, so we need to do this in the open_logs phase.
+ */
+static int prefork_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
+{
+    int startup = 0;
+    int level_flags = 0;
+    ap_listen_rec **listen_buckets;
+    apr_status_t rv;
+    char id[16];
+    int i;
+
+    pconf = p;
+
+    /* the reverse of pre_config, we want this only the first time around */
+    if (retained->mpm->module_loads == 1) {
+        startup = 1;
+        level_flags |= APLOG_STARTUP;
+    }
+
+    if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT | level_flags, 0,
+                     (startup ? NULL : s),
+                     "no listening sockets available, shutting down");
+        return !OK;
+    }
+
+    if (one_process) {
+        retained->mpm->num_buckets = 1;
+    }
+    else if (!retained->mpm->was_graceful) {
+        /* Preserve the number of buckets on graceful restarts. */
+        retained->mpm->num_buckets = 0;
+    }
+    if ((rv = ap_duplicate_listeners(pconf, ap_server_conf,
+                                     &listen_buckets, &retained->mpm->num_buckets))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+                     (startup ? NULL : s),
+                     "could not duplicate listeners");
+        return !OK;
+    }
+    all_buckets = apr_pcalloc(pconf, retained->mpm->num_buckets *
+                                     sizeof(prefork_child_bucket));
+    for (i = 0; i < retained->mpm->num_buckets; i++) {
+        if ((rv = ap_mpm_pod_open(pconf, &all_buckets[i].pod))) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+                         (startup ? NULL : s),
+                         "could not open pipe-of-death");
+            return !OK;
+        }
+        /* Initialize cross-process accept lock (safe accept needed only) */
+        if ((rv = SAFE_ACCEPT((apr_snprintf(id, sizeof id, "%i", i),
+                               ap_proc_mutex_create(&all_buckets[i].mutex,
+                                                    NULL, AP_ACCEPT_MUTEX_TYPE,
+                                                    id, s, pconf, 0))))) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+                         (startup ? NULL : s),
+                         "could not create accept mutex");
+            return !OK;
+        }
+        all_buckets[i].listeners = listen_buckets[i];
+    }
+
+    return OK;
+}
+
+static int prefork_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+    int no_detach, debug, foreground;
+    apr_status_t rv;
+    const char *userdata_key = "mpm_prefork_module";
+
+    debug = ap_exists_config_define("DEBUG");
+
+    if (debug) {
+        foreground = one_process = 1;
+        no_detach = 0;
+    }
+    else
+    {
+        no_detach = ap_exists_config_define("NO_DETACH");
+        one_process = ap_exists_config_define("ONE_PROCESS");
+        foreground = ap_exists_config_define("FOREGROUND");
+    }
+
+    ap_mutex_register(p, AP_ACCEPT_MUTEX_TYPE, NULL, APR_LOCK_DEFAULT, 0);
+
+    retained = ap_retained_data_get(userdata_key);
+    if (!retained) {
+        retained = ap_retained_data_create(userdata_key, sizeof(*retained));
+        retained->mpm = ap_unixd_mpm_get_retained_data();
+        retained->max_daemons_limit = -1;
+        retained->idle_spawn_rate = 1;
+    }
+    retained->mpm->mpm_state = AP_MPMQ_STARTING;
+    if (retained->mpm->baton != retained) {
+        retained->mpm->was_graceful = 0;
+        retained->mpm->baton = retained;
+    }
+    ++retained->mpm->module_loads;
+
+    /* sigh, want this only the second time around */
+    if (retained->mpm->module_loads == 2) {
+        if (!one_process && !foreground) {
+            /* before we detach, setup crash handlers to log to errorlog */
+            ap_fatal_signal_setup(ap_server_conf, pconf);
+            rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
+                                           : APR_PROC_DETACH_DAEMONIZE);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00174)
+                             "apr_proc_detach failed");
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+        }
+    }
+
+    parent_pid = ap_my_pid = getpid();
+
+    ap_listen_pre_config();
+    ap_daemons_to_start = DEFAULT_START_DAEMON;
+    ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
+    ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
+    server_limit = DEFAULT_SERVER_LIMIT;
+    ap_daemons_limit = server_limit;
+    ap_extended_status = 0;
+
+    return OK;
+}
+
+static int prefork_check_config(apr_pool_t *p, apr_pool_t *plog,
+                                apr_pool_t *ptemp, server_rec *s)
+{
+    int startup = 0;
+
+    /* the reverse of pre_config, we want this only the first time around */
+    if (retained->mpm->module_loads == 1) {
+        startup = 1;
+    }
+
+    if (server_limit > MAX_SERVER_LIMIT) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00175)
+                         "WARNING: ServerLimit of %d exceeds compile-time "
+                         "limit of %d servers, decreasing to %d.",
+                         server_limit, MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00176)
+                         "ServerLimit of %d exceeds compile-time limit "
+                         "of %d, decreasing to match",
+                         server_limit, MAX_SERVER_LIMIT);
+        }
+        server_limit = MAX_SERVER_LIMIT;
+    }
+    else if (server_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00177)
+                         "WARNING: ServerLimit of %d not allowed, "
+                         "increasing to 1.", server_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00178)
+                         "ServerLimit of %d not allowed, increasing to 1",
+                         server_limit);
+        }
+        server_limit = 1;
+    }
+
+    /* you cannot change ServerLimit across a restart; ignore
+     * any such attempts
+     */
+    if (!retained->first_server_limit) {
+        retained->first_server_limit = server_limit;
+    }
+    else if (server_limit != retained->first_server_limit) {
+        /* don't need a startup console version here */
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00179)
+                     "changing ServerLimit to %d from original value of %d "
+                     "not allowed during restart",
+                     server_limit, retained->first_server_limit);
+        server_limit = retained->first_server_limit;
+    }
+
+    if (ap_daemons_limit > server_limit) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00180)
+                         "WARNING: MaxRequestWorkers of %d exceeds ServerLimit "
+                         "value of %d servers, decreasing MaxRequestWorkers to %d. "
+                         "To increase, please see the ServerLimit directive.",
+                         ap_daemons_limit, server_limit, server_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00181)
+                         "MaxRequestWorkers of %d exceeds ServerLimit value "
+                         "of %d, decreasing to match",
+                         ap_daemons_limit, server_limit);
+        }
+        ap_daemons_limit = server_limit;
+    }
+    else if (ap_daemons_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00182)
+                         "WARNING: MaxRequestWorkers of %d not allowed, "
+                         "increasing to 1.", ap_daemons_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00183)
+                         "MaxRequestWorkers of %d not allowed, increasing to 1",
+                         ap_daemons_limit);
+        }
+        ap_daemons_limit = 1;
+    }
+
+    /* ap_daemons_to_start > ap_daemons_limit checked in prefork_run() */
+    if (ap_daemons_to_start < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00184)
+                         "WARNING: StartServers of %d not allowed, "
+                         "increasing to 1.", ap_daemons_to_start);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00185)
+                         "StartServers of %d not allowed, increasing to 1",
+                         ap_daemons_to_start);
+        }
+        ap_daemons_to_start = 1;
+    }
+
+    if (ap_daemons_min_free < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00186)
+                         "WARNING: MinSpareServers of %d not allowed, "
+                         "increasing to 1 to avoid almost certain server failure. "
+                         "Please read the documentation.", ap_daemons_min_free);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00187)
+                         "MinSpareServers of %d not allowed, increasing to 1",
+                         ap_daemons_min_free);
+        }
+        ap_daemons_min_free = 1;
+    }
+
+    /* ap_daemons_max_free < ap_daemons_min_free + 1 checked in prefork_run() */
+
+    return OK;
+}
+
+static void prefork_hooks(apr_pool_t *p)
+{
+    /* Our open_logs hook function must run before the core's, or stderr
+     * will be redirected to a file, and the messages won't print to the
+     * console.
+     */
+    static const char *const aszSucc[] = {"core.c", NULL};
+
+    ap_hook_open_logs(prefork_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
+    /* we need to set the MPM state before other pre-config hooks use MPM query
+     * to retrieve it, so register as REALLY_FIRST
+     */
+    ap_hook_pre_config(prefork_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
+    ap_hook_check_config(prefork_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm(prefork_run, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_query(prefork_query, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_get_name(prefork_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_daemons_to_start = atoi(arg);
+    return NULL;
+}
+
+static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_daemons_min_free = atoi(arg);
+    return NULL;
+}
+
+static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_daemons_max_free = atoi(arg);
+    return NULL;
+}
+
+static const char *set_max_clients (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+    if (!strcasecmp(cmd->cmd->name, "MaxClients")) {
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00188)
+                     "MaxClients is deprecated, use MaxRequestWorkers "
+                     "instead.");
+    }
+    ap_daemons_limit = atoi(arg);
+    return NULL;
+}
+
+static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    server_limit = atoi(arg);
+    return NULL;
+}
+
+static const command_rec prefork_cmds[] = {
+LISTEN_COMMANDS,
+AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
+              "Number of child processes launched at server startup"),
+AP_INIT_TAKE1("MinSpareServers", set_min_free_servers, NULL, RSRC_CONF,
+              "Minimum number of idle children, to handle request spikes"),
+AP_INIT_TAKE1("MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF,
+              "Maximum number of idle children"),
+AP_INIT_TAKE1("MaxClients", set_max_clients, NULL, RSRC_CONF,
+              "Deprecated name of MaxRequestWorkers"),
+AP_INIT_TAKE1("MaxRequestWorkers", set_max_clients, NULL, RSRC_CONF,
+              "Maximum number of children alive at the same time"),
+AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
+              "Maximum value of MaxRequestWorkers for this run of Apache"),
+AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
+{ NULL }
+};
+
+AP_DECLARE_MODULE(mpm_prefork) = {
+    MPM20_MODULE_STUFF,
+    NULL,                       /* hook to run before apache parses args */
+    NULL,                       /* create per-directory config structure */
+    NULL,                       /* merge per-directory config structures */
+    NULL,                       /* create per-server config structure */
+    NULL,                       /* merge per-server config structures */
+    prefork_cmds,               /* command apr_table_t */
+    prefork_hooks,              /* register hooks */
+};
diff --git a/server/mpm/winnt/Makefile.in b/server/mpm/winnt/Makefile.in
new file mode 100644
index 0000000..f34af9c
--- /dev/null
+++ b/server/mpm/winnt/Makefile.in
@@ -0,0 +1 @@
+include $(top_srcdir)/build/special.mk
diff --git a/server/mpm/winnt/child.c b/server/mpm/winnt/child.c
new file mode 100644
index 0000000..21755f3
--- /dev/null
+++ b/server/mpm/winnt/child.c
@@ -0,0 +1,1289 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifdef WIN32
+
+#include "apr.h"
+#include <process.h>
+#include "httpd.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h"  /* for read_config */
+#include "http_core.h"    /* for get_remote_host */
+#include "http_connection.h"
+#include "http_vhost.h"   /* for ap_update_vhost_given_ip */
+#include "apr_portable.h"
+#include "apr_thread_proc.h"
+#include "apr_getopt.h"
+#include "apr_strings.h"
+#include "apr_lib.h"
+#include "apr_shm.h"
+#include "apr_thread_mutex.h"
+#include "ap_mpm.h"
+#include "ap_config.h"
+#include "ap_listen.h"
+#include "mpm_default.h"
+#include "mpm_winnt.h"
+#include "mpm_common.h"
+#include <malloc.h>
+#include "apr_atomic.h"
+#include "apr_buckets.h"
+#include "scoreboard.h"
+
+#ifdef __MINGW32__
+#include <mswsock.h>
+
+#ifndef WSAID_ACCEPTEX
+#define WSAID_ACCEPTEX \
+  {0xb5367df1, 0xcbac, 0x11cf, {0x95, 0xca, 0x00, 0x80, 0x5f, 0x48, 0xa1, 0x92}}
+typedef BOOL (WINAPI *LPFN_ACCEPTEX)(SOCKET, SOCKET, PVOID, DWORD, DWORD, DWORD, LPDWORD, LPOVERLAPPED);
+#endif /* WSAID_ACCEPTEX */
+
+#ifndef WSAID_GETACCEPTEXSOCKADDRS
+#define WSAID_GETACCEPTEXSOCKADDRS \
+  {0xb5367df2, 0xcbac, 0x11cf, {0x95, 0xca, 0x00, 0x80, 0x5f, 0x48, 0xa1, 0x92}}
+typedef VOID (WINAPI *LPFN_GETACCEPTEXSOCKADDRS)(PVOID, DWORD, DWORD, DWORD,
+                                                 struct sockaddr **, LPINT,
+                                                 struct sockaddr **, LPINT);
+#endif /* WSAID_GETACCEPTEXSOCKADDRS */
+
+#endif /* __MINGW32__ */
+
+/*
+ * The Windows MPM uses a queue of completion contexts that it passes
+ * between the accept threads and the worker threads. Declare the
+ * functions to access the queue and the structures passed on the
+ * queue in the header file to enable modules to access them
+ * if necessary. The queue resides in the MPM.
+ */
+#ifdef CONTAINING_RECORD
+#undef CONTAINING_RECORD
+#endif
+#define CONTAINING_RECORD(address, type, field) ((type *)( \
+                                                  (char *)(address) - \
+                                                  (char *)(&((type *)0)->field)))
+#if APR_HAVE_IPV6
+#define PADDED_ADDR_SIZE (sizeof(SOCKADDR_IN6)+16)
+#else
+#define PADDED_ADDR_SIZE (sizeof(SOCKADDR_IN)+16)
+#endif
+
+APLOG_USE_MODULE(mpm_winnt);
+
+/* Queue for managing the passing of winnt_conn_ctx_t between
+ * the accept and worker threads.
+ */
+typedef struct winnt_conn_ctx_t_s {
+    struct winnt_conn_ctx_t_s *next;
+    OVERLAPPED overlapped;
+    apr_socket_t *sock;
+    SOCKET accept_socket;
+    char buff[2*PADDED_ADDR_SIZE];
+    struct sockaddr *sa_server;
+    int sa_server_len;
+    struct sockaddr *sa_client;
+    int sa_client_len;
+    apr_pool_t *ptrans;
+    apr_bucket_alloc_t *ba;
+    apr_bucket *data;
+#if APR_HAVE_IPV6
+    short socket_family;
+#endif
+} winnt_conn_ctx_t;
+
+typedef enum {
+    IOCP_CONNECTION_ACCEPTED = 1,
+    IOCP_WAIT_FOR_RECEIVE = 2,
+    IOCP_WAIT_FOR_TRANSMITFILE = 3,
+    IOCP_SHUTDOWN = 4
+} io_state_e;
+
+static apr_pool_t *pchild;
+static int shutdown_in_progress = 0;
+static int workers_may_exit = 0;
+static unsigned int g_blocked_threads = 0;
+static HANDLE max_requests_per_child_event;
+
+static apr_thread_mutex_t  *child_lock;
+static apr_thread_mutex_t  *qlock;
+static winnt_conn_ctx_t *qhead = NULL;
+static winnt_conn_ctx_t *qtail = NULL;
+static apr_uint32_t num_completion_contexts = 0;
+static apr_uint32_t max_num_completion_contexts = 0;
+static HANDLE ThreadDispatchIOCP = NULL;
+static HANDLE qwait_event = NULL;
+
+static void mpm_recycle_completion_context(winnt_conn_ctx_t *context)
+{
+    /* Recycle the completion context.
+     * - clear the ptrans pool
+     * - put the context on the queue to be consumed by the accept thread
+     * Note:
+     * context->accept_socket may be in a disconnected but reusable
+     * state so -don't- close it.
+     */
+    if (context) {
+        HANDLE saved_event;
+
+        apr_pool_clear(context->ptrans);
+        context->ba = apr_bucket_alloc_create(context->ptrans);
+        context->next = NULL;
+
+        saved_event = context->overlapped.hEvent;
+        memset(&context->overlapped, 0, sizeof(context->overlapped));
+        context->overlapped.hEvent = saved_event;
+        ResetEvent(context->overlapped.hEvent);
+
+        apr_thread_mutex_lock(qlock);
+        if (qtail) {
+            qtail->next = context;
+        } else {
+            qhead = context;
+            SetEvent(qwait_event);
+        }
+        qtail = context;
+        apr_thread_mutex_unlock(qlock);
+    }
+}
+
+static winnt_conn_ctx_t *mpm_get_completion_context(int *timeout)
+{
+    apr_status_t rv;
+    winnt_conn_ctx_t *context = NULL;
+
+    *timeout = 0;
+    while (1) {
+        /* Grab a context off the queue */
+        apr_thread_mutex_lock(qlock);
+        if (qhead) {
+            context = qhead;
+            qhead = qhead->next;
+            if (!qhead)
+                qtail = NULL;
+        } else {
+            ResetEvent(qwait_event);
+        }
+        apr_thread_mutex_unlock(qlock);
+
+        if (!context) {
+            /* We failed to grab a context off the queue, consider allocating
+             * a new one out of the child pool. There may be up to
+             * (ap_threads_per_child + num_listeners) contexts in the system
+             * at once.
+             */
+            if (num_completion_contexts >= max_num_completion_contexts) {
+                /* All workers are busy, need to wait for one */
+                static int reported = 0;
+                if (!reported) {
+                    ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00326)
+                                 "Server ran out of threads to serve "
+                                 "requests. Consider raising the "
+                                 "ThreadsPerChild setting");
+                    reported = 1;
+                }
+
+                /* Wait for a worker to free a context. Once per second, give
+                 * the caller a chance to check for shutdown. If the wait
+                 * succeeds, get the context off the queue. It must be
+                 * available, since there's only one consumer.
+                 */
+                rv = WaitForSingleObject(qwait_event, 1000);
+                if (rv == WAIT_OBJECT_0)
+                    continue;
+                else {
+                    if (rv == WAIT_TIMEOUT) {
+                        /* somewhat-normal condition where threads are busy */
+                        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00327)
+                                     "mpm_get_completion_context: Failed to get a "
+                                     "free context within 1 second");
+                        *timeout = 1;
+                    }
+                    else {
+                        /* should be the unexpected, generic WAIT_FAILED */
+                        ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_os_error(),
+                                     ap_server_conf, APLOGNO(00328)
+                                     "mpm_get_completion_context: "
+                                     "WaitForSingleObject failed to get free context");
+                    }
+                    return NULL;
+                }
+            } else {
+                /* Allocate another context.
+                 * Note: Multiple failures in the next two steps will cause
+                 * the pchild pool to 'leak' storage. I don't think this
+                 * is worth fixing...
+                 */
+                apr_allocator_t *allocator;
+
+                apr_thread_mutex_lock(child_lock);
+                context = (winnt_conn_ctx_t *)apr_pcalloc(pchild,
+                                                     sizeof(winnt_conn_ctx_t));
+
+
+                context->overlapped.hEvent = CreateEvent(NULL, TRUE,
+                                                         FALSE, NULL);
+                if (context->overlapped.hEvent == NULL) {
+                    /* Hopefully this is a temporary condition ... */
+                    ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_os_error(),
+                                 ap_server_conf, APLOGNO(00329)
+                                 "mpm_get_completion_context: "
+                                 "CreateEvent failed.");
+
+                    apr_thread_mutex_unlock(child_lock);
+                    return NULL;
+                }
+
+                /* Create the transaction pool */
+                apr_allocator_create(&allocator);
+                apr_allocator_max_free_set(allocator, ap_max_mem_free);
+                rv = apr_pool_create_ex(&context->ptrans, pchild, NULL,
+                                        allocator);
+                if (rv != APR_SUCCESS) {
+                    ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, APLOGNO(00330)
+                                 "mpm_get_completion_context: Failed "
+                                 "to create the transaction pool.");
+                    CloseHandle(context->overlapped.hEvent);
+
+                    apr_thread_mutex_unlock(child_lock);
+                    return NULL;
+                }
+                apr_allocator_owner_set(allocator, context->ptrans);
+                apr_pool_tag(context->ptrans, "transaction");
+
+                context->accept_socket = INVALID_SOCKET;
+                context->ba = apr_bucket_alloc_create(context->ptrans);
+                apr_atomic_inc32(&num_completion_contexts);
+
+                apr_thread_mutex_unlock(child_lock);
+                break;
+            }
+        } else {
+            /* Got a context from the queue */
+            break;
+        }
+    }
+
+    return context;
+}
+
+typedef enum {
+    ACCEPT_FILTER_NONE = 0,
+    ACCEPT_FILTER_CONNECT = 1
+} accept_filter_e;
+
+static const char * accept_filter_to_string(accept_filter_e accf)
+{
+    switch (accf) {
+    case ACCEPT_FILTER_NONE:
+        return "none";
+    case ACCEPT_FILTER_CONNECT:
+        return "connect";
+    default:
+        return "";
+    }
+}
+
+static accept_filter_e get_accept_filter(const char *protocol)
+{
+    core_server_config *core_sconf;
+    const char *name;
+
+    core_sconf = ap_get_core_module_config(ap_server_conf->module_config);
+    name = apr_table_get(core_sconf->accf_map, protocol);
+    if (!name) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf,
+                     APLOGNO(02531) "winnt_accept: Listen protocol '%s' has "
+                     "no known accept filter. Using 'none' instead",
+                     protocol);
+        return ACCEPT_FILTER_NONE;
+    }
+    else if (strcmp(name, "data") == 0) {
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
+                     APLOGNO(03458) "winnt_accept: 'data' accept filter is no "
+                     "longer supported. Using 'connect' instead");
+        return ACCEPT_FILTER_CONNECT;
+    }
+    else if (strcmp(name, "connect") == 0) {
+        return ACCEPT_FILTER_CONNECT;
+    }
+    else if (strcmp(name, "none") == 0) {
+        return ACCEPT_FILTER_NONE;
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00331)
+                     "winnt_accept: unrecognized AcceptFilter '%s', "
+                     "only 'data', 'connect' or 'none' are valid. "
+                     "Using 'none' instead", name);
+        return ACCEPT_FILTER_NONE;
+    }
+}
+
+/* Windows NT/2000 specific code...
+ * Accept processing for on Windows NT uses a producer/consumer queue
+ * model. An accept thread accepts connections off the network then issues
+ * PostQueuedCompletionStatus() to awake a thread blocked on the ThreadDispatch
+ * IOCompletionPort.
+ *
+ * winnt_accept()
+ *    One or more accept threads run in this function, each of which accepts
+ *    connections off the network and calls PostQueuedCompletionStatus() to
+ *    queue an io completion packet to the ThreadDispatch IOCompletionPort.
+ * winnt_get_connection()
+ *    Worker threads block on the ThreadDispatch IOCompletionPort awaiting
+ *    connections to service.
+ */
+#define MAX_ACCEPTEX_ERR_COUNT 10
+
+static unsigned int __stdcall winnt_accept(void *lr_)
+{
+    ap_listen_rec *lr = (ap_listen_rec *)lr_;
+    apr_os_sock_info_t sockinfo;
+    winnt_conn_ctx_t *context = NULL;
+    DWORD BytesRead;
+    SOCKET nlsd;
+    LPFN_ACCEPTEX lpfnAcceptEx = NULL;
+    LPFN_GETACCEPTEXSOCKADDRS lpfnGetAcceptExSockaddrs = NULL;
+    GUID GuidAcceptEx = WSAID_ACCEPTEX;
+    GUID GuidGetAcceptExSockaddrs = WSAID_GETACCEPTEXSOCKADDRS;
+    int rv;
+    accept_filter_e accf;
+    int err_count = 0;
+    HANDLE events[3];
+#if APR_HAVE_IPV6
+    SOCKADDR_STORAGE ss_listen;
+    int namelen = sizeof(ss_listen);
+#endif
+    u_long zero = 0;
+
+    apr_os_sock_get(&nlsd, lr->sd);
+
+#if APR_HAVE_IPV6
+    if (getsockname(nlsd, (struct sockaddr *)&ss_listen, &namelen) == SOCKET_ERROR) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_netos_error(),
+                     ap_server_conf, APLOGNO(00332)
+                     "winnt_accept: getsockname error on listening socket, "
+                     "is IPv6 available?");
+        return 1;
+   }
+#endif
+
+    accf = get_accept_filter(lr->protocol);
+    if (accf == ACCEPT_FILTER_CONNECT)
+    {
+        if (WSAIoctl(nlsd, SIO_GET_EXTENSION_FUNCTION_POINTER,
+                     &GuidAcceptEx, sizeof GuidAcceptEx, 
+                     &lpfnAcceptEx, sizeof lpfnAcceptEx, 
+                     &BytesRead, NULL, NULL) == SOCKET_ERROR) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_netos_error(),
+                         ap_server_conf, APLOGNO(02322)
+                         "winnt_accept: failed to retrieve AcceptEx, try 'AcceptFilter none'");
+            return 1;
+        }
+        if (WSAIoctl(nlsd, SIO_GET_EXTENSION_FUNCTION_POINTER,
+                     &GuidGetAcceptExSockaddrs, sizeof GuidGetAcceptExSockaddrs,
+                     &lpfnGetAcceptExSockaddrs, sizeof lpfnGetAcceptExSockaddrs,
+                     &BytesRead, NULL, NULL) == SOCKET_ERROR) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_netos_error(),
+                         ap_server_conf, APLOGNO(02323)
+                         "winnt_accept: failed to retrieve GetAcceptExSockaddrs, try 'AcceptFilter none'");
+            return 1;
+        }
+        /* first, high priority event is an already accepted connection */
+        events[1] = exit_event;
+        events[2] = max_requests_per_child_event;
+    }
+    else /* accf == ACCEPT_FILTER_NONE */
+    {
+reinit: /* target of connect upon too many AcceptEx failures */
+
+        /* last, low priority event is a not yet accepted connection */
+        events[0] = exit_event;
+        events[1] = max_requests_per_child_event;
+        events[2] = CreateEvent(NULL, FALSE, FALSE, NULL);
+
+        /* The event needs to be removed from the accepted socket,
+         * if not removed from the listen socket prior to accept(),
+         */
+        rv = WSAEventSelect(nlsd, events[2], FD_ACCEPT);
+        if (rv) {
+            ap_log_error(APLOG_MARK, APLOG_ERR,
+                         apr_get_netos_error(), ap_server_conf, APLOGNO(00333)
+                         "WSAEventSelect() failed.");
+            CloseHandle(events[2]);
+            return 1;
+        }
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00334)
+                 "Child: Accept thread listening on %pI using AcceptFilter %s",
+                 lr->bind_addr, accept_filter_to_string(accf));
+
+    while (!shutdown_in_progress) {
+        if (!context) {
+            int timeout;
+
+            context = mpm_get_completion_context(&timeout);
+            if (!context) {
+                if (!timeout) {
+                    /* Hopefully a temporary condition in the provider? */
+                    ++err_count;
+                    if (err_count > MAX_ACCEPTEX_ERR_COUNT) {
+                        ap_log_error(APLOG_MARK, APLOG_CRIT, 0, ap_server_conf, APLOGNO(00335)
+                                     "winnt_accept: Too many failures grabbing a "
+                                     "connection ctx.  Aborting.");
+                        break;
+                    }
+                }
+                Sleep(100);
+                continue;
+            }
+        }
+
+        if (accf == ACCEPT_FILTER_CONNECT)
+        {
+            char *buf;
+
+            /* Create and initialize the accept socket */
+#if APR_HAVE_IPV6
+            if (context->accept_socket == INVALID_SOCKET) {
+                context->accept_socket = socket(ss_listen.ss_family, SOCK_STREAM,
+                                                IPPROTO_TCP);
+                context->socket_family = ss_listen.ss_family;
+            }
+            else if (context->socket_family != ss_listen.ss_family) {
+                closesocket(context->accept_socket);
+                context->accept_socket = socket(ss_listen.ss_family, SOCK_STREAM,
+                                                IPPROTO_TCP);
+                context->socket_family = ss_listen.ss_family;
+            }
+#else
+            if (context->accept_socket == INVALID_SOCKET)
+                context->accept_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+#endif
+
+            if (context->accept_socket == INVALID_SOCKET) {
+                ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_netos_error(),
+                             ap_server_conf, APLOGNO(00336)
+                             "winnt_accept: Failed to allocate an accept socket. "
+                             "Temporary resource constraint? Try again.");
+                Sleep(100);
+                continue;
+            }
+
+            buf = context->buff;
+
+            /* AcceptEx on the completion context. The completion context will be
+             * signaled when a connection is accepted.
+             */
+            if (!lpfnAcceptEx(nlsd, context->accept_socket, buf, 0,
+                              PADDED_ADDR_SIZE, PADDED_ADDR_SIZE, &BytesRead,
+                              &context->overlapped)) {
+                rv = apr_get_netos_error();
+                if ((rv == APR_FROM_OS_ERROR(WSAECONNRESET)) ||
+                    (rv == APR_FROM_OS_ERROR(WSAEACCES))) {
+                    /* We can get here when:
+                     * 1) the client disconnects early
+                     * 2) handshake was incomplete
+                     */
+                    closesocket(context->accept_socket);
+                    context->accept_socket = INVALID_SOCKET;
+                    continue;
+                }
+                else if ((rv == APR_FROM_OS_ERROR(WSAEINVAL)) ||
+                         (rv == APR_FROM_OS_ERROR(WSAENOTSOCK))) {
+                    /* We can get here when:
+                     * 1) TransmitFile does not properly recycle the accept socket (typically
+                     *    because the client disconnected)
+                     * 2) there is VPN or Firewall software installed with
+                     *    buggy WSAAccept or WSADuplicateSocket implementation
+                     * 3) the dynamic address / adapter has changed
+                     * Give five chances, then fall back on AcceptFilter 'none'
+                     */
+                    closesocket(context->accept_socket);
+                    context->accept_socket = INVALID_SOCKET;
+                    ++err_count;
+                    if (err_count > MAX_ACCEPTEX_ERR_COUNT) {
+                        ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00337)
+                                     "Child: Encountered too many AcceptEx "
+                                     "faults accepting client connections. "
+                                     "Possible causes: dynamic address renewal, "
+                                     "or incompatible VPN or firewall software. ");
+                        ap_log_error(APLOG_MARK, APLOG_NOTICE, rv, ap_server_conf, APLOGNO(00338)
+                                     "winnt_mpm: falling back to "
+                                     "'AcceptFilter none'.");
+                        err_count = 0;
+                        accf = ACCEPT_FILTER_NONE;
+                    }
+                    continue;
+                }
+                else if ((rv != APR_FROM_OS_ERROR(ERROR_IO_PENDING)) &&
+                         (rv != APR_FROM_OS_ERROR(WSA_IO_PENDING))) {
+                    closesocket(context->accept_socket);
+                    context->accept_socket = INVALID_SOCKET;
+                    ++err_count;
+                    if (err_count > MAX_ACCEPTEX_ERR_COUNT) {
+                        ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00339)
+                                     "Child: Encountered too many AcceptEx "
+                                     "faults accepting client connections.");
+                        ap_log_error(APLOG_MARK, APLOG_NOTICE, rv, ap_server_conf, APLOGNO(00340)
+                                     "winnt_mpm: falling back to "
+                                     "'AcceptFilter none'.");
+                        err_count = 0;
+                        accf = ACCEPT_FILTER_NONE;
+                        goto reinit;
+                    }
+                    continue;
+                }
+
+                err_count = 0;
+                events[0] = context->overlapped.hEvent;
+
+                do {
+                    rv = WaitForMultipleObjectsEx(3, events, FALSE, INFINITE, TRUE);
+                } while (rv == WAIT_IO_COMPLETION);
+
+                if (rv == WAIT_OBJECT_0) {
+                    if ((context->accept_socket != INVALID_SOCKET) &&
+                        !GetOverlappedResult((HANDLE)context->accept_socket,
+                                             &context->overlapped,
+                                             &BytesRead, FALSE)) {
+                        ap_log_error(APLOG_MARK, APLOG_WARNING,
+                                     apr_get_os_error(), ap_server_conf, APLOGNO(00341)
+                             "winnt_accept: Asynchronous AcceptEx failed.");
+                        closesocket(context->accept_socket);
+                        context->accept_socket = INVALID_SOCKET;
+                    }
+                }
+                else {
+                    /* exit_event triggered or event handle was closed */
+                    closesocket(context->accept_socket);
+                    context->accept_socket = INVALID_SOCKET;
+                    break;
+                }
+
+                if (context->accept_socket == INVALID_SOCKET) {
+                    continue;
+                }
+            }
+            err_count = 0;
+
+            /* Potential optimization; consider handing off to the worker */
+
+            /* Inherit the listen socket settings. Required for
+             * shutdown() to work
+             */
+            if (setsockopt(context->accept_socket, SOL_SOCKET,
+                           SO_UPDATE_ACCEPT_CONTEXT, (char *)&nlsd,
+                           sizeof(nlsd))) {
+                ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_netos_error(),
+                             ap_server_conf, APLOGNO(00342)
+                             "setsockopt(SO_UPDATE_ACCEPT_CONTEXT) failed.");
+                /* Not a failure condition. Keep running. */
+            }
+
+            /* Get the local & remote address
+             * TODO; error check
+             */
+            lpfnGetAcceptExSockaddrs(buf, 0, PADDED_ADDR_SIZE, PADDED_ADDR_SIZE,
+                                     &context->sa_server, &context->sa_server_len,
+                                     &context->sa_client, &context->sa_client_len);
+        }
+        else /* accf == ACCEPT_FILTER_NONE */
+        {
+            /* There is no socket reuse without AcceptEx() */
+            if (context->accept_socket != INVALID_SOCKET)
+                closesocket(context->accept_socket);
+
+            /* This could be a persistent event per-listener rather than
+             * per-accept.  However, the event needs to be removed from
+             * the target socket if not removed from the listen socket
+             * prior to accept(), or the event select is inherited.
+             * and must be removed from the accepted socket.
+             */
+
+            do {
+                rv = WaitForMultipleObjectsEx(3, events, FALSE, INFINITE, TRUE);
+            } while (rv == WAIT_IO_COMPLETION);
+
+
+            if (rv != WAIT_OBJECT_0 + 2) {
+                /* not FD_ACCEPT;
+                 * exit_event triggered or event handle was closed
+                 */
+                break;
+            }
+
+            context->sa_server = (void *) context->buff;
+            context->sa_server_len = sizeof(context->buff) / 2;
+            context->sa_client_len = context->sa_server_len;
+            context->sa_client = (void *) (context->buff
+                                         + context->sa_server_len);
+
+            context->accept_socket = accept(nlsd, context->sa_server,
+                                            &context->sa_server_len);
+
+            if (context->accept_socket == INVALID_SOCKET) {
+
+                rv = apr_get_netos_error();
+                if (   rv == APR_FROM_OS_ERROR(WSAECONNRESET)
+                    || rv == APR_FROM_OS_ERROR(WSAEINPROGRESS)
+                    || rv == APR_FROM_OS_ERROR(WSAEWOULDBLOCK) ) {
+                    ap_log_error(APLOG_MARK, APLOG_DEBUG,
+                                 rv, ap_server_conf, APLOGNO(00343)
+                                 "accept() failed, retrying.");
+                    continue;
+                }
+
+                /* A more serious error than 'retry', log it */
+                ap_log_error(APLOG_MARK, APLOG_WARNING,
+                             rv, ap_server_conf, APLOGNO(00344)
+                             "accept() failed.");
+
+                if (   rv == APR_FROM_OS_ERROR(WSAEMFILE)
+                    || rv == APR_FROM_OS_ERROR(WSAENOBUFS) ) {
+                    /* Hopefully a temporary condition in the provider? */
+                    Sleep(100);
+                    ++err_count;
+                    if (err_count > MAX_ACCEPTEX_ERR_COUNT) {
+                        ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00345)
+                                     "Child: Encountered too many accept() "
+                                     "resource faults, aborting.");
+                        break;
+                    }
+                    continue;
+                }
+                break;
+            }
+            /* Per MSDN, cancel the inherited association of this socket
+             * to the WSAEventSelect API, and restore the state corresponding
+             * to apr_os_sock_make's default assumptions (really, a flaw within
+             * os_sock_make and os_sock_put that it does not query).
+             */
+            WSAEventSelect(context->accept_socket, 0, 0);
+            err_count = 0;
+
+            context->sa_server_len = sizeof(context->buff) / 2;
+            if (getsockname(context->accept_socket, context->sa_server,
+                            &context->sa_server_len) == SOCKET_ERROR) {
+                ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_netos_error(), ap_server_conf, APLOGNO(00346)
+                             "getsockname failed");
+                continue;
+            }
+            if ((getpeername(context->accept_socket, context->sa_client,
+                             &context->sa_client_len)) == SOCKET_ERROR) {
+                ap_log_error(APLOG_MARK, APLOG_WARNING, apr_get_netos_error(), ap_server_conf, APLOGNO(00347)
+                             "getpeername failed");
+                memset(&context->sa_client, '\0', sizeof(context->sa_client));
+            }
+        }
+
+        sockinfo.os_sock  = &context->accept_socket;
+        sockinfo.local    = context->sa_server;
+        sockinfo.remote   = context->sa_client;
+        sockinfo.family   = context->sa_server->sa_family;
+        sockinfo.type     = SOCK_STREAM;
+        sockinfo.protocol = IPPROTO_TCP;
+        /* Restore the state corresponding to apr_os_sock_make's default
+         * assumption of timeout -1 (really, a flaw of os_sock_make and
+         * os_sock_put that it does not query to determine ->timeout).
+         * XXX: Upon a fix to APR, these three statements should disappear.
+         */
+        ioctlsocket(context->accept_socket, FIONBIO, &zero);
+        setsockopt(context->accept_socket, SOL_SOCKET, SO_RCVTIMEO,
+                   (char *) &zero, sizeof(zero));
+        setsockopt(context->accept_socket, SOL_SOCKET, SO_SNDTIMEO,
+                   (char *) &zero, sizeof(zero));
+        apr_os_sock_make(&context->sock, &sockinfo, context->ptrans);
+
+        /* When a connection is received, send an io completion notification
+         * to the ThreadDispatchIOCP.
+         */
+        PostQueuedCompletionStatus(ThreadDispatchIOCP, BytesRead,
+                                   IOCP_CONNECTION_ACCEPTED,
+                                   &context->overlapped);
+        context = NULL;
+    }
+    if (accf == ACCEPT_FILTER_NONE)
+        CloseHandle(events[2]);
+
+    if (!shutdown_in_progress) {
+        /* Yow, hit an irrecoverable error! Tell the child to die. */
+        SetEvent(exit_event);
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00348)
+                 "Child: Accept thread exiting.");
+    return 0;
+}
+
+
+static winnt_conn_ctx_t *winnt_get_connection(winnt_conn_ctx_t *context)
+{
+    int rc;
+    DWORD BytesRead;
+    LPOVERLAPPED pol;
+#ifdef _WIN64
+    ULONG_PTR CompKey;
+#else
+    DWORD CompKey;
+#endif
+
+    mpm_recycle_completion_context(context);
+
+    apr_atomic_inc32(&g_blocked_threads);
+    while (1) {
+        if (workers_may_exit) {
+            apr_atomic_dec32(&g_blocked_threads);
+            return NULL;
+        }
+        rc = GetQueuedCompletionStatus(ThreadDispatchIOCP, &BytesRead,
+                                       &CompKey, &pol, INFINITE);
+        if (!rc) {
+            rc = apr_get_os_error();
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, rc, ap_server_conf, APLOGNO(00349)
+                         "Child: GetQueuedCompletionStatus returned %d",
+                         rc);
+            continue;
+        }
+
+        switch (CompKey) {
+        case IOCP_CONNECTION_ACCEPTED:
+            context = CONTAINING_RECORD(pol, winnt_conn_ctx_t, overlapped);
+            break;
+        case IOCP_SHUTDOWN:
+            apr_atomic_dec32(&g_blocked_threads);
+            return NULL;
+        default:
+            apr_atomic_dec32(&g_blocked_threads);
+            return NULL;
+        }
+        break;
+    }
+    apr_atomic_dec32(&g_blocked_threads);
+
+    return context;
+}
+
+/*
+ * worker_main()
+ * Main entry point for the worker threads. Worker threads block in
+ * win*_get_connection() awaiting a connection to service.
+ */
+static DWORD __stdcall worker_main(void *thread_num_val)
+{
+    apr_thread_t *thd;
+    apr_os_thread_t osthd;
+    static int requests_this_child = 0;
+    winnt_conn_ctx_t *context = NULL;
+    int thread_num = (int)thread_num_val;
+    ap_sb_handle_t *sbh;
+    conn_rec *c;
+    apr_int32_t disconnected;
+
+    osthd = apr_os_thread_current();
+
+    while (1) {
+
+        ap_update_child_status_from_indexes(0, thread_num, SERVER_READY, NULL);
+
+        /* Grab a connection off the network */
+        context = winnt_get_connection(context);
+
+        if (!context) {
+            /* Time for the thread to exit */
+            break;
+        }
+
+        /* Have we hit MaxConnectionsPerChild connections? */
+        if (ap_max_requests_per_child) {
+            requests_this_child++;
+            if (requests_this_child > ap_max_requests_per_child) {
+                SetEvent(max_requests_per_child_event);
+            }
+        }
+
+        ap_create_sb_handle(&sbh, context->ptrans, 0, thread_num);
+        c = ap_run_create_connection(context->ptrans, ap_server_conf,
+                                     context->sock, thread_num, sbh,
+                                     context->ba);
+
+        if (!c) {
+            /* ap_run_create_connection closes the socket on failure */
+            context->accept_socket = INVALID_SOCKET;
+            continue;
+        }
+
+        thd = NULL;
+        apr_os_thread_put(&thd, &osthd, context->ptrans);
+        c->current_thread = thd;
+
+        ap_process_connection(c, context->sock);
+
+        ap_lingering_close(c);
+
+        apr_socket_opt_get(context->sock, APR_SO_DISCONNECTED, &disconnected);
+        if (!disconnected) {
+            context->accept_socket = INVALID_SOCKET;
+        }
+    }
+
+    ap_update_child_status_from_indexes(0, thread_num, SERVER_DEAD, NULL);
+
+    return 0;
+}
+
+
+static void cleanup_thread(HANDLE *handles, int *thread_cnt,
+                           int thread_to_clean)
+{
+    int i;
+
+    CloseHandle(handles[thread_to_clean]);
+    for (i = thread_to_clean; i < ((*thread_cnt) - 1); i++)
+        handles[i] = handles[i + 1];
+    (*thread_cnt)--;
+}
+
+
+/*
+ * child_main()
+ * Entry point for the main control thread for the child process.
+ * This thread creates the accept thread, worker threads and
+ * monitors the child process for maintenance and shutdown
+ * events.
+ */
+static void create_listener_thread(void)
+{
+    unsigned tid;
+    int num_listeners = 0;
+    /* Start an accept thread per listener
+     * XXX: Why would we have a NULL sd in our listeners?
+     */
+    ap_listen_rec *lr;
+
+    /* Number of completion_contexts allowed in the system is
+     * (ap_threads_per_child + num_listeners). We need the additional
+     * completion contexts to prevent server hangs when ThreadsPerChild
+     * is configured to something less than or equal to the number
+     * of listeners. This is not a usual case, but people have
+     * encountered it.
+     */
+    for (lr = ap_listeners; lr ; lr = lr->next) {
+        num_listeners++;
+    }
+    max_num_completion_contexts = ap_threads_per_child + num_listeners;
+
+    /* Now start a thread per listener */
+    for (lr = ap_listeners; lr; lr = lr->next) {
+        if (lr->sd != NULL) {
+            /* A smaller stack is sufficient.
+             * To convert to CreateThread, the returned handle cannot be
+             * ignored, it must be closed/joined.
+             */
+            _beginthreadex(NULL, 65536, winnt_accept,
+                           (void *) lr, stack_res_flag, &tid);
+        }
+    }
+}
+
+
+void child_main(apr_pool_t *pconf, DWORD parent_pid)
+{
+    apr_status_t status;
+    apr_hash_t *ht;
+    ap_listen_rec *lr;
+    HANDLE child_events[3];
+    HANDLE *child_handles;
+    int listener_started = 0;
+    int threads_created = 0;
+    int watch_thread;
+    int time_remains;
+    int cld;
+    DWORD tid;
+    int rv;
+    int i;
+    int num_events;
+
+    /* Get a sub context for global allocations in this child, so that
+     * we can have cleanups occur when the child exits.
+     */
+    apr_pool_create(&pchild, pconf);
+    apr_pool_tag(pchild, "pchild");
+
+    ap_run_child_init(pchild, ap_server_conf);
+    ht = apr_hash_make(pchild);
+
+    /* Initialize the child_events */
+    max_requests_per_child_event = CreateEvent(NULL, TRUE, FALSE, NULL);
+    if (!max_requests_per_child_event) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00350)
+                     "Child: Failed to create a max_requests event.");
+        exit(APEXIT_CHILDINIT);
+    }
+    child_events[0] = exit_event;
+    child_events[1] = max_requests_per_child_event;
+
+    if (parent_pid != my_pid) {
+        child_events[2] = OpenProcess(SYNCHRONIZE, FALSE, parent_pid);
+        if (child_events[2] == NULL) {
+            num_events = 2;
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), ap_server_conf, APLOGNO(02643)
+                         "Child: Failed to open handle to parent process %ld; "
+                         "will not react to abrupt parent termination", parent_pid);
+        }
+        else {
+            num_events = 3;
+        }
+    }
+    else {
+        /* presumably -DONE_PROCESS */
+        child_events[2] = NULL;
+        num_events = 2;
+    }
+
+    /*
+     * Wait until we have permission to start accepting connections.
+     * start_mutex is used to ensure that only one child ever
+     * goes into the listen/accept loop at once.
+     */
+    status = apr_proc_mutex_lock(start_mutex);
+    if (status != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, status, ap_server_conf, APLOGNO(00351)
+                     "Child: Failed to acquire the start_mutex. "
+                     "Process will exit.");
+        exit(APEXIT_CHILDINIT);
+    }
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00352)
+                 "Child: Acquired the start mutex.");
+
+    /*
+     * Create the worker thread dispatch IOCompletionPort
+     */
+    /* Create the worker thread dispatch IOCP */
+    ThreadDispatchIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE,
+                                                NULL, 0, 0);
+    apr_thread_mutex_create(&qlock, APR_THREAD_MUTEX_DEFAULT, pchild);
+    qwait_event = CreateEvent(NULL, TRUE, FALSE, NULL);
+    if (!qwait_event) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(),
+                     ap_server_conf, APLOGNO(00353)
+                     "Child: Failed to create a qwait event.");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    /*
+     * Create the pool of worker threads
+     */
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00354)
+                 "Child: Starting %d worker threads.", ap_threads_per_child);
+    child_handles = (HANDLE) apr_pcalloc(pchild, ap_threads_per_child
+                                                  * sizeof(HANDLE));
+    apr_thread_mutex_create(&child_lock, APR_THREAD_MUTEX_DEFAULT, pchild);
+
+    while (1) {
+        for (i = 0; i < ap_threads_per_child; i++) {
+            int *score_idx;
+            int status = ap_scoreboard_image->servers[0][i].status;
+            if (status != SERVER_GRACEFUL && status != SERVER_DEAD) {
+                continue;
+            }
+            ap_update_child_status_from_indexes(0, i, SERVER_STARTING, NULL);
+
+            child_handles[i] = CreateThread(NULL, ap_thread_stacksize,
+                                            worker_main, (void *) i,
+                                            stack_res_flag, &tid);
+            if (child_handles[i] == 0) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(),
+                             ap_server_conf, APLOGNO(00355)
+                             "Child: CreateThread failed. Unable to "
+                             "create all worker threads. Created %d of the %d "
+                             "threads requested with the ThreadsPerChild "
+                             "configuration directive.",
+                             threads_created, ap_threads_per_child);
+                ap_signal_parent(SIGNAL_PARENT_SHUTDOWN);
+                goto shutdown;
+            }
+            threads_created++;
+            /* Save the score board index in ht keyed to the thread handle.
+             * We need this when cleaning up threads down below...
+             */
+            apr_thread_mutex_lock(child_lock);
+            score_idx = apr_pcalloc(pchild, sizeof(int));
+            *score_idx = i;
+            apr_hash_set(ht, &child_handles[i], sizeof(HANDLE), score_idx);
+            apr_thread_mutex_unlock(child_lock);
+        }
+        /* Start the listener only when workers are available */
+        if (!listener_started && threads_created) {
+            create_listener_thread();
+            listener_started = 1;
+            winnt_mpm_state = AP_MPMQ_RUNNING;
+        }
+        if (threads_created == ap_threads_per_child) {
+            break;
+        }
+        /* Check to see if the child has been told to exit */
+        if (WaitForSingleObject(exit_event, 0) != WAIT_TIMEOUT) {
+            break;
+        }
+        /* wait for previous generation to clean up an entry in the scoreboard
+         */
+        apr_sleep(1 * APR_USEC_PER_SEC);
+    }
+
+    /* Wait for one of these events:
+     * exit_event:
+     *    The exit_event is signaled by the parent process to notify
+     *    the child that it is time to exit.
+     *
+     * max_requests_per_child_event:
+     *    This event is signaled by the worker threads to indicate that
+     *    the process has handled MaxConnectionsPerChild connections.
+     *
+     * parent process exiting
+     *
+     * TIMEOUT:
+     *    To do periodic maintenance on the server (check for thread exits,
+     *    number of completion contexts, etc.)
+     *
+     * XXX: thread exits *aren't* being checked.
+     *
+     * XXX: other_child - we need the process handles to the other children
+     *      in order to map them to apr_proc_other_child_read (which is not
+     *      named well, it's more like a_p_o_c_died.)
+     *
+     * XXX: however - if we get a_p_o_c handle inheritance working, and
+     *      the parent process creates other children and passes the pipes
+     *      to our worker processes, then we have no business doing such
+     *      things in the child_main loop, but should happen in master_main.
+     */
+    while (1) {
+#if !APR_HAS_OTHER_CHILD
+        rv = WaitForMultipleObjects(num_events, (HANDLE *)child_events, FALSE, INFINITE);
+        cld = rv - WAIT_OBJECT_0;
+#else
+        /* THIS IS THE EXPECTED BUILD VARIATION -- APR_HAS_OTHER_CHILD */
+        rv = WaitForMultipleObjects(num_events, (HANDLE *)child_events, FALSE, 1000);
+        cld = rv - WAIT_OBJECT_0;
+        if (rv == WAIT_TIMEOUT) {
+            apr_proc_other_child_refresh_all(APR_OC_REASON_RUNNING);
+        }
+        else
+#endif
+            if (rv == WAIT_FAILED) {
+            /* Something serious is wrong */
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(),
+                         ap_server_conf, APLOGNO(00356)
+                         "Child: WAIT_FAILED -- shutting down server");
+            /* check handle validity to identify a possible culprit */
+            for (i = 0; i < num_events; i++) {
+                DWORD out_flags;
+
+                if (0 == GetHandleInformation(child_events[i], &out_flags)) {
+                    ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(),
+                                 ap_server_conf, APLOGNO(02644)
+                                 "Child: Event handle #%d (%pp) is invalid",
+                                 i, child_events[i]);
+                }
+            }
+            break;
+        }
+        else if (cld == 0) {
+            /* Exit event was signaled */
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00357)
+                         "Child: Exit event signaled. Child process is "
+                         "ending.");
+            break;
+        }
+        else if (cld == 2) {
+            /* The parent is dead.  Shutdown the child process. */
+            ap_log_error(APLOG_MARK, APLOG_CRIT, 0, ap_server_conf, APLOGNO(02538)
+                         "Child: Parent process exited abruptly. Child process "
+                         "is ending");
+            break;
+        }
+        else {
+            /* MaxConnectionsPerChild event set by the worker threads.
+             * Signal the parent to restart
+             */
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00358)
+                         "Child: Process exiting because it reached "
+                         "MaxConnectionsPerChild. Signaling the parent to "
+                         "restart a new child process.");
+            ap_signal_parent(SIGNAL_PARENT_RESTART);
+            break;
+        }
+    }
+
+    /*
+     * Time to shutdown the child process
+     */
+
+ shutdown:
+
+    winnt_mpm_state = AP_MPMQ_STOPPING;
+
+    /* Close the listening sockets. Note, we must close the listeners
+     * before closing any accept sockets pending in AcceptEx to prevent
+     * memory leaks in the kernel.
+     */
+    for (lr = ap_listeners; lr ; lr = lr->next) {
+        apr_socket_close(lr->sd);
+    }
+
+    /* Shutdown listener threads and pending AcceptEx sockets
+     * but allow the worker threads to continue consuming from
+     * the queue of accepted connections.
+     */
+    shutdown_in_progress = 1;
+
+    Sleep(1000);
+
+    /* Tell the worker threads to exit */
+    workers_may_exit = 1;
+
+    /* Release the start_mutex to let the new process (in the restart
+     * scenario) a chance to begin accepting and servicing requests
+     */
+    rv = apr_proc_mutex_unlock(start_mutex);
+    if (rv == APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00359)
+                     "Child: Released the start mutex");
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00360)
+                     "Child: Failure releasing the start mutex");
+    }
+
+    /* Shutdown the worker threads
+     * Post worker threads blocked on the ThreadDispatch IOCompletion port
+     */
+    while (g_blocked_threads > 0) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00361)
+                     "Child: %d threads blocked on the completion port",
+                     g_blocked_threads);
+        for (i=g_blocked_threads; i > 0; i--) {
+            PostQueuedCompletionStatus(ThreadDispatchIOCP, 0,
+                                       IOCP_SHUTDOWN, NULL);
+        }
+        Sleep(1000);
+    }
+    /* Empty the accept queue of completion contexts */
+    apr_thread_mutex_lock(qlock);
+    while (qhead) {
+        CloseHandle(qhead->overlapped.hEvent);
+        closesocket(qhead->accept_socket);
+        qhead = qhead->next;
+    }
+    apr_thread_mutex_unlock(qlock);
+
+    /* Give busy threads a chance to service their connections
+     * (no more than the global server timeout period which
+     * we track in msec remaining).
+     */
+    watch_thread = 0;
+    time_remains = (int)(ap_server_conf->timeout / APR_TIME_C(1000));
+
+    while (threads_created)
+    {
+        int nFailsafe = MAXIMUM_WAIT_OBJECTS;
+        DWORD dwRet;
+
+        /* Every time we roll over to wait on the first group
+         * of MAXIMUM_WAIT_OBJECTS threads, take a breather,
+         * and infrequently update the error log.
+         */
+        if (watch_thread >= threads_created) {
+            if ((time_remains -= 100) < 0)
+                break;
+
+            /* Every 30 seconds give an update */
+            if ((time_remains % 30000) == 0) {
+                ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS,
+                             ap_server_conf, APLOGNO(00362)
+                             "Child: Waiting %d more seconds "
+                             "for %d worker threads to finish.",
+                             time_remains / 1000, threads_created);
+            }
+            /* We'll poll from the top, 10 times per second */
+            Sleep(100);
+            watch_thread = 0;
+        }
+
+        /* Fairness, on each iteration we will pick up with the thread
+         * after the one we just removed, even if it's a single thread.
+         * We don't block here.
+         */
+        dwRet = WaitForMultipleObjects(min(threads_created - watch_thread,
+                                           MAXIMUM_WAIT_OBJECTS),
+                                       child_handles + watch_thread, 0, 0);
+
+        if (dwRet == WAIT_FAILED) {
+            break;
+        }
+        if (dwRet == WAIT_TIMEOUT) {
+            /* none ready */
+            watch_thread += MAXIMUM_WAIT_OBJECTS;
+            continue;
+        }
+        else if (dwRet >= WAIT_ABANDONED_0) {
+            /* We just got the ownership of the object, which
+             * should happen at most MAXIMUM_WAIT_OBJECTS times.
+             * It does NOT mean that the object is signaled.
+             */
+            if ((nFailsafe--) < 1)
+                break;
+        }
+        else {
+            watch_thread += (dwRet - WAIT_OBJECT_0);
+            if (watch_thread >= threads_created)
+                break;
+            cleanup_thread(child_handles, &threads_created, watch_thread);
+        }
+    }
+
+    /* Kill remaining threads off the hard way */
+    if (threads_created) {
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00363)
+                     "Child: Terminating %d threads that failed to exit.",
+                     threads_created);
+    }
+    for (i = 0; i < threads_created; i++) {
+        int *idx;
+        TerminateThread(child_handles[i], 1);
+        CloseHandle(child_handles[i]);
+        /* Reset the scoreboard entry for the thread we just whacked */
+        idx = apr_hash_get(ht, &child_handles[i], sizeof(HANDLE));
+        if (idx) {
+            ap_update_child_status_from_indexes(0, *idx, SERVER_DEAD, NULL);
+        }
+    }
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00364)
+                 "Child: All worker threads have exited.");
+
+    apr_thread_mutex_destroy(child_lock);
+    apr_thread_mutex_destroy(qlock);
+    CloseHandle(qwait_event);
+    CloseHandle(ThreadDispatchIOCP);
+
+    apr_pool_destroy(pchild);
+    CloseHandle(exit_event);
+    if (child_events[2] != NULL) {
+        CloseHandle(child_events[2]);
+    }
+}
+
+#endif /* def WIN32 */
diff --git a/server/mpm/winnt/config.m4 b/server/mpm/winnt/config.m4
new file mode 100644
index 0000000..5c1fd42
--- /dev/null
+++ b/server/mpm/winnt/config.m4
@@ -0,0 +1,10 @@
+AC_MSG_CHECKING(if WinNT MPM supports this platform)
+case $host in
+    *mingw32*)
+        AC_MSG_RESULT(yes)
+        APACHE_MPM_SUPPORTED(winnt, no, yes)
+        ;;
+    *)
+        AC_MSG_RESULT(no)
+        ;;
+esac
diff --git a/server/mpm/winnt/config3.m4 b/server/mpm/winnt/config3.m4
new file mode 100644
index 0000000..f937e40
--- /dev/null
+++ b/server/mpm/winnt/config3.m4
@@ -0,0 +1,2 @@
+winnt_objects="child.lo mpm_winnt.lo nt_eventlog.lo service.lo"
+APACHE_MPM_MODULE(winnt, $enable_mpm_winnt, $winnt_objects)
diff --git a/server/mpm/winnt/mpm_default.h b/server/mpm/winnt/mpm_default.h
new file mode 100644
index 0000000..b5350d4
--- /dev/null
+++ b/server/mpm/winnt/mpm_default.h
@@ -0,0 +1,60 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file  winnt/mpm_default.h
+ * @brief win32 MPM defaults
+ *
+ * @defgroup APACHE_MPM_WINNT WinNT MPM
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Default limit on the maximum setting of the ThreadsPerChild configuration
+ * directive.  This limit can be overridden with the ThreadLimit directive.
+ * This limit directly influences the amount of shared storage that is allocated
+ * for the scoreboard. DEFAULT_THREAD_LIMIT represents a good compromise
+ * between scoreboard size and the ability of the server to handle the most
+ * common installation requirements.
+ */
+#ifndef DEFAULT_THREAD_LIMIT
+#define DEFAULT_THREAD_LIMIT 1920
+#endif
+
+/* The ThreadLimit directive can be used to override the DEFAULT_THREAD_LIMIT.
+ * ThreadLimit cannot be tuned larger than MAX_THREAD_LIMIT.
+ * This is a sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_THREAD_LIMIT
+#define MAX_THREAD_LIMIT 15000
+#endif
+
+/* Number of threads started in the child process in the absence
+ * of a ThreadsPerChild configuration directive
+ */
+#ifndef DEFAULT_THREADS_PER_CHILD
+#define DEFAULT_THREADS_PER_CHILD 64
+#endif
+
+/* Max number of child processes allowed.
+ */
+#define HARD_SERVER_LIMIT 1
+
+#endif /* AP_MPM_DEFAULT_H */
+/** @} */
diff --git a/server/mpm/winnt/mpm_winnt.c b/server/mpm/winnt/mpm_winnt.c
new file mode 100644
index 0000000..3d71f80
--- /dev/null
+++ b/server/mpm/winnt/mpm_winnt.c
@@ -0,0 +1,1786 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifdef WIN32
+
+#include "httpd.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h" /* for read_config */
+#include "http_core.h"   /* for get_remote_host */
+#include "http_connection.h"
+#include "apr_portable.h"
+#include "apr_thread_proc.h"
+#include "apr_getopt.h"
+#include "apr_strings.h"
+#include "apr_lib.h"
+#include "apr_shm.h"
+#include "apr_thread_mutex.h"
+#include "ap_mpm.h"
+#include "apr_general.h"
+#include "ap_config.h"
+#include "ap_listen.h"
+#include "mpm_default.h"
+#include "mpm_winnt.h"
+#include "mpm_common.h"
+#include <malloc.h>
+#include "apr_atomic.h"
+#include "scoreboard.h"
+
+#ifdef __WATCOMC__
+#define _environ environ
+#endif
+
+#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION /* missing on MinGW */
+#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
+#endif
+
+/* Because ap_setup_listeners() is skipped in the child, any merging
+ * of [::]:80 and 0.0.0.0:80 for AP_ENABLE_V4_MAPPED in the parent
+ * won't have taken place in the child, so the child will expect to
+ * read two sockets for "Listen 80" but the parent will send only
+ * one.
+ */
+#ifdef AP_ENABLE_V4_MAPPED
+#error The WinNT MPM does not currently support AP_ENABLE_V4_MAPPED
+#endif
+
+/* scoreboard.c does the heavy lifting; all we do is create the child
+ * score by moving a handle down the pipe into the child's stdin.
+ */
+extern apr_shm_t *ap_scoreboard_shm;
+
+/* my_generation is returned to the scoreboard code */
+static volatile ap_generation_t my_generation=0;
+
+/* Definitions of WINNT MPM specific config globals */
+static HANDLE shutdown_event;  /* used to signal the parent to shutdown */
+static HANDLE restart_event;   /* used to signal the parent to restart */
+
+static int one_process = 0;
+static char const* signal_arg = NULL;
+
+OSVERSIONINFO osver; /* VER_PLATFORM_WIN32_NT */
+
+/* set by child_main to STACK_SIZE_PARAM_IS_A_RESERVATION for NT >= 5.1 (XP/2003) */
+DWORD stack_res_flag;
+
+static DWORD parent_pid;
+DWORD my_pid;
+
+/* used by parent to signal the child to start and exit */
+apr_proc_mutex_t *start_mutex;
+HANDLE exit_event;
+
+int ap_threads_per_child = 0;
+static int thread_limit = 0;
+static int first_thread_limit = 0;
+int winnt_mpm_state = AP_MPMQ_STARTING;
+
+/* shared by service.c as global, although
+ * perhaps it should be private.
+ */
+apr_pool_t *pconf;
+
+/* Only one of these, the pipe from our parent, meant only for
+ * one child worker's consumption (not to be inherited!)
+ * XXX: decorate this name for the trunk branch, was left simplified
+ *      only to make the 2.2 patch trivial to read.
+ */
+static HANDLE pipe;
+
+/*
+ * Command processors
+ */
+
+static const char *set_threads_per_child (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_threads_per_child = atoi(arg);
+    return NULL;
+}
+static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    thread_limit = atoi(arg);
+    return NULL;
+}
+
+static const command_rec winnt_cmds[] = {
+LISTEN_COMMANDS,
+AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
+  "Number of threads each child creates" ),
+AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
+  "Maximum worker threads in a server for this run of Apache"),
+{ NULL }
+};
+
+static void winnt_note_child_started(int slot, pid_t pid)
+{
+    ap_scoreboard_image->parent[slot].pid = pid;
+    ap_scoreboard_image->parent[slot].generation = my_generation;
+    ap_run_child_status(ap_server_conf,
+                        ap_scoreboard_image->parent[slot].pid,
+                        my_generation, slot, MPM_CHILD_STARTED);
+}
+
+static void winnt_note_child_killed(int slot)
+{
+    ap_run_child_status(ap_server_conf,
+                        ap_scoreboard_image->parent[slot].pid,
+                        ap_scoreboard_image->parent[slot].generation,
+                        slot, MPM_CHILD_EXITED);
+    ap_scoreboard_image->parent[slot].pid = 0;
+}
+
+/*
+ * Signalling Apache on NT.
+ *
+ * Under Unix, Apache can be told to shutdown or restart by sending various
+ * signals (HUP, USR, TERM). On NT we don't have easy access to signals, so
+ * we use "events" instead. The parent apache process goes into a loop
+ * where it waits forever for a set of events. Two of those events are
+ * called
+ *
+ *    apPID_shutdown
+ *    apPID_restart
+ *
+ * (where PID is the PID of the apache parent process). When one of these
+ * is signalled, the Apache parent performs the appropriate action. The events
+ * can become signalled through internal Apache methods (e.g. if the child
+ * finds a fatal error and needs to kill its parent), via the service
+ * control manager (the control thread will signal the shutdown event when
+ * requested to stop the Apache service), from the -k Apache command line,
+ * or from any external program which finds the Apache PID from the
+ * httpd.pid file.
+ *
+ * The signal_parent() function, below, is used to signal one of these events.
+ * It can be called by any child or parent process, since it does not
+ * rely on global variables.
+ *
+ * On entry, type gives the event to signal. 0 means shutdown, 1 means
+ * graceful restart.
+ */
+/*
+ * Initialise the signal names, in the global variables signal_name_prefix,
+ * signal_restart_name and signal_shutdown_name.
+ */
+#define MAX_SIGNAL_NAME 30  /* Long enough for apPID_shutdown, where PID is an int */
+static char signal_name_prefix[MAX_SIGNAL_NAME];
+static char signal_restart_name[MAX_SIGNAL_NAME];
+static char signal_shutdown_name[MAX_SIGNAL_NAME];
+static void setup_signal_names(char *prefix)
+{
+    apr_snprintf(signal_name_prefix, sizeof(signal_name_prefix), prefix);
+    apr_snprintf(signal_shutdown_name, sizeof(signal_shutdown_name),
+        "%s_shutdown", signal_name_prefix);
+    apr_snprintf(signal_restart_name, sizeof(signal_restart_name),
+        "%s_restart", signal_name_prefix);
+}
+
+AP_DECLARE(void) ap_signal_parent(ap_signal_parent_e type)
+{
+    HANDLE e;
+    char *signal_name;
+
+    if (parent_pid == my_pid) {
+        switch(type) {
+           case SIGNAL_PARENT_SHUTDOWN:
+           {
+               SetEvent(shutdown_event);
+               break;
+           }
+           /* This MPM supports only graceful restarts right now */
+           case SIGNAL_PARENT_RESTART:
+           case SIGNAL_PARENT_RESTART_GRACEFUL:
+           {
+               SetEvent(restart_event);
+               break;
+           }
+        }
+        return;
+    }
+
+    switch(type) {
+       case SIGNAL_PARENT_SHUTDOWN:
+       {
+           signal_name = signal_shutdown_name;
+           break;
+       }
+       /* This MPM supports only graceful restarts right now */
+       case SIGNAL_PARENT_RESTART:
+       case SIGNAL_PARENT_RESTART_GRACEFUL:
+       {
+           signal_name = signal_restart_name;
+           break;
+       }
+       default:
+           return;
+    }
+
+    e = OpenEvent(EVENT_MODIFY_STATE, FALSE, signal_name);
+    if (!e) {
+        /* Um, problem, can't signal the parent, which means we can't
+         * signal ourselves to die. Ignore for now...
+         */
+        ap_log_error(APLOG_MARK, APLOG_EMERG, apr_get_os_error(), ap_server_conf, APLOGNO(00382)
+                     "OpenEvent on %s event", signal_name);
+        return;
+    }
+    if (SetEvent(e) == 0) {
+        /* Same problem as above */
+        ap_log_error(APLOG_MARK, APLOG_EMERG, apr_get_os_error(), ap_server_conf, APLOGNO(00383)
+                     "SetEvent on %s event", signal_name);
+        CloseHandle(e);
+        return;
+    }
+    CloseHandle(e);
+}
+
+
+/*
+ * Passed the following handles [in sync with send_handles_to_child()]
+ *
+ *   ready event [signal the parent immediately, then close]
+ *   exit event  [save to poll later]
+ *   start mutex [signal from the parent to begin accept()]
+ *   scoreboard shm handle [to recreate the ap_scoreboard]
+ */
+static void get_handles_from_parent(server_rec *s, HANDLE *child_exit_event,
+                                    apr_proc_mutex_t **child_start_mutex,
+                                    apr_shm_t **scoreboard_shm)
+{
+    HANDLE hScore;
+    HANDLE ready_event;
+    HANDLE os_start;
+    DWORD BytesRead;
+    void *sb_shared;
+    apr_status_t rv;
+
+    /* *** We now do this way back in winnt_rewrite_args
+     * pipe = GetStdHandle(STD_INPUT_HANDLE);
+     */
+    if (!ReadFile(pipe, &ready_event, sizeof(HANDLE),
+                  &BytesRead, (LPOVERLAPPED) NULL)
+        || (BytesRead != sizeof(HANDLE))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00384)
+                     "Child: Unable to retrieve the ready event from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    SetEvent(ready_event);
+    CloseHandle(ready_event);
+
+    if (!ReadFile(pipe, child_exit_event, sizeof(HANDLE),
+                  &BytesRead, (LPOVERLAPPED) NULL)
+        || (BytesRead != sizeof(HANDLE))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00385)
+                     "Child: Unable to retrieve the exit event from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    if (!ReadFile(pipe, &os_start, sizeof(os_start),
+                  &BytesRead, (LPOVERLAPPED) NULL)
+        || (BytesRead != sizeof(os_start))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00386)
+                     "Child: Unable to retrieve the start_mutex from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+    *child_start_mutex = NULL;
+    if ((rv = apr_os_proc_mutex_put(child_start_mutex, &os_start, s->process->pool))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00387)
+                     "Child: Unable to access the start_mutex from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    if (!ReadFile(pipe, &hScore, sizeof(hScore),
+                  &BytesRead, (LPOVERLAPPED) NULL)
+        || (BytesRead != sizeof(hScore))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00388)
+                     "Child: Unable to retrieve the scoreboard from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+    *scoreboard_shm = NULL;
+    if ((rv = apr_os_shm_put(scoreboard_shm, &hScore, s->process->pool))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00389)
+                     "Child: Unable to access the scoreboard from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    rv = ap_reopen_scoreboard(s->process->pool, scoreboard_shm, 1);
+    if (rv || !(sb_shared = apr_shm_baseaddr_get(*scoreboard_shm))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00390)
+                     "Child: Unable to reopen the scoreboard from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+    /* We must 'initialize' the scoreboard to relink all the
+     * process-local pointer arrays into the shared memory block.
+     */
+    ap_init_scoreboard(sb_shared);
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00391)
+                 "Child: Retrieved our scoreboard from the parent.");
+}
+
+
+static int send_handles_to_child(apr_pool_t *p,
+                                 HANDLE child_ready_event,
+                                 HANDLE child_exit_event,
+                                 apr_proc_mutex_t *child_start_mutex,
+                                 apr_shm_t *scoreboard_shm,
+                                 HANDLE hProcess,
+                                 apr_file_t *child_in)
+{
+    apr_status_t rv;
+    HANDLE hCurrentProcess = GetCurrentProcess();
+    HANDLE hDup;
+    HANDLE os_start;
+    HANDLE hScore;
+    apr_size_t BytesWritten;
+
+    if ((rv = apr_file_write_full(child_in, &my_generation,
+                                  sizeof(my_generation), NULL))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(02964)
+                     "Parent: Unable to send its generation to the child");
+        return -1;
+    }
+    if (!DuplicateHandle(hCurrentProcess, child_ready_event, hProcess, &hDup,
+        EVENT_MODIFY_STATE | SYNCHRONIZE, FALSE, 0)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00392)
+                     "Parent: Unable to duplicate the ready event handle for the child");
+        return -1;
+    }
+    if ((rv = apr_file_write_full(child_in, &hDup, sizeof(hDup), &BytesWritten))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00393)
+                     "Parent: Unable to send the exit event handle to the child");
+        return -1;
+    }
+    if (!DuplicateHandle(hCurrentProcess, child_exit_event, hProcess, &hDup,
+                         EVENT_MODIFY_STATE | SYNCHRONIZE, FALSE, 0)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00394)
+                     "Parent: Unable to duplicate the exit event handle for the child");
+        return -1;
+    }
+    if ((rv = apr_file_write_full(child_in, &hDup, sizeof(hDup), &BytesWritten))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00395)
+                     "Parent: Unable to send the exit event handle to the child");
+        return -1;
+    }
+    if ((rv = apr_os_proc_mutex_get(&os_start, child_start_mutex)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00396)
+                     "Parent: Unable to retrieve the start mutex for the child");
+        return -1;
+    }
+    if (!DuplicateHandle(hCurrentProcess, os_start, hProcess, &hDup,
+                         SYNCHRONIZE, FALSE, 0)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00397)
+                     "Parent: Unable to duplicate the start mutex to the child");
+        return -1;
+    }
+    if ((rv = apr_file_write_full(child_in, &hDup, sizeof(hDup), &BytesWritten))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00398)
+                     "Parent: Unable to send the start mutex to the child");
+        return -1;
+    }
+    if ((rv = apr_os_shm_get(&hScore, scoreboard_shm)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00399)
+                     "Parent: Unable to retrieve the scoreboard handle for the child");
+        return -1;
+    }
+    if (!DuplicateHandle(hCurrentProcess, hScore, hProcess, &hDup,
+                         FILE_MAP_READ | FILE_MAP_WRITE, FALSE, 0)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00400)
+                     "Parent: Unable to duplicate the scoreboard handle to the child");
+        return -1;
+    }
+    if ((rv = apr_file_write_full(child_in, &hDup, sizeof(hDup), &BytesWritten))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00401)
+                     "Parent: Unable to send the scoreboard handle to the child");
+        return -1;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00402)
+                 "Parent: Sent the scoreboard to the child");
+    return 0;
+}
+
+
+/*
+ * get_listeners_from_parent()
+ * The listen sockets are opened in the parent. This function, which runs
+ * exclusively in the child process, receives them from the parent and
+ * makes them availeble in the child.
+ */
+static void get_listeners_from_parent(server_rec *s)
+{
+    WSAPROTOCOL_INFO WSAProtocolInfo;
+    ap_listen_rec *lr;
+    DWORD BytesRead;
+    int lcnt = 0;
+    SOCKET nsd;
+
+    /* Set up a default listener if necessary */
+    if (ap_listeners == NULL) {
+        ap_listen_rec *lr;
+        lr = apr_palloc(s->process->pool, sizeof(ap_listen_rec));
+        lr->sd = NULL;
+        lr->next = ap_listeners;
+        ap_listeners = lr;
+    }
+
+    /* Open the pipe to the parent process to receive the inherited socket
+     * data. The sockets have been set to listening in the parent process.
+     *
+     * *** We now do this way back in winnt_rewrite_args
+     * pipe = GetStdHandle(STD_INPUT_HANDLE);
+     */
+    for (lr = ap_listeners; lr; lr = lr->next, ++lcnt) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00403)
+                     "Child: Waiting for data for listening socket %pI",
+                     lr->bind_addr);
+        if (!ReadFile(pipe, &WSAProtocolInfo, sizeof(WSAPROTOCOL_INFO),
+                      &BytesRead, (LPOVERLAPPED) NULL)) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00404)
+                         "Child: Unable to read socket data from parent");
+            exit(APEXIT_CHILDINIT);
+        }
+
+        nsd = WSASocket(FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO,
+                        &WSAProtocolInfo, 0, 0);
+        if (nsd == INVALID_SOCKET) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_netos_error(), ap_server_conf, APLOGNO(00405)
+                         "Child: WSASocket failed to open the inherited socket");
+            exit(APEXIT_CHILDINIT);
+        }
+
+        if (!SetHandleInformation((HANDLE)nsd, HANDLE_FLAG_INHERIT, 0)) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), ap_server_conf, APLOGNO(00406)
+                         "Child: SetHandleInformation failed");
+        }
+        apr_os_sock_put(&lr->sd, &nsd, s->process->pool);
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00407)
+                 "Child: retrieved %d listeners from parent", lcnt);
+}
+
+
+static int send_listeners_to_child(apr_pool_t *p, DWORD dwProcessId,
+                                   apr_file_t *child_in)
+{
+    apr_status_t rv;
+    int lcnt = 0;
+    ap_listen_rec *lr;
+    LPWSAPROTOCOL_INFO  lpWSAProtocolInfo;
+    apr_size_t BytesWritten;
+
+    /* Run the chain of open sockets. For each socket, duplicate it
+     * for the target process then send the WSAPROTOCOL_INFO
+     * (returned by dup socket) to the child.
+     */
+    for (lr = ap_listeners; lr; lr = lr->next, ++lcnt) {
+        apr_os_sock_t nsd;
+        lpWSAProtocolInfo = apr_pcalloc(p, sizeof(WSAPROTOCOL_INFO));
+        apr_os_sock_get(&nsd, lr->sd);
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00408)
+                     "Parent: Duplicating socket %d (%pI) and sending it to child process %lu",
+                     nsd, lr->bind_addr, dwProcessId);
+        if (WSADuplicateSocket(nsd, dwProcessId,
+                               lpWSAProtocolInfo) == SOCKET_ERROR) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_netos_error(), ap_server_conf, APLOGNO(00409)
+                         "Parent: WSADuplicateSocket failed for socket %d. Check the FAQ.", nsd);
+            return -1;
+        }
+
+        if ((rv = apr_file_write_full(child_in, lpWSAProtocolInfo,
+                                      sizeof(WSAPROTOCOL_INFO), &BytesWritten))
+                != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00410)
+                         "Parent: Unable to write duplicated socket %d to the child.", nsd);
+            return -1;
+        }
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00411)
+                 "Parent: Sent %d listeners to child %lu", lcnt, dwProcessId);
+    return 0;
+}
+
+enum waitlist_e {
+    waitlist_ready = 0,
+    waitlist_term = 1
+};
+
+static int create_process(apr_pool_t *p, HANDLE *child_proc, HANDLE *child_exit_event,
+                          DWORD *child_pid)
+{
+    /* These NEVER change for the lifetime of this parent
+     */
+    static char **args = NULL;
+    static char pidbuf[28];
+
+    apr_status_t rv;
+    apr_pool_t *ptemp;
+    apr_procattr_t *attr;
+    apr_proc_t new_child;
+    HANDLE hExitEvent;
+    HANDLE waitlist[2];  /* see waitlist_e */
+    char *cmd;
+    char *cwd;
+    char **env;
+    int envc;
+
+    apr_pool_create_ex(&ptemp, p, NULL, NULL);
+
+    /* Build the command line. Should look something like this:
+     * C:/apache/bin/httpd.exe -f ap_server_confname
+     * First, get the path to the executable...
+     */
+    apr_procattr_create(&attr, ptemp);
+    apr_procattr_cmdtype_set(attr, APR_PROGRAM);
+    apr_procattr_detach_set(attr, 1);
+    if (((rv = apr_filepath_get(&cwd, 0, ptemp)) != APR_SUCCESS)
+           || ((rv = apr_procattr_dir_set(attr, cwd)) != APR_SUCCESS)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00412)
+                     "Parent: Failed to get the current path");
+    }
+
+    if (!args) {
+        /* Build the args array, only once since it won't change
+         * for the lifetime of this parent process.
+         */
+        if ((rv = ap_os_proc_filepath(&cmd, ptemp))
+                != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, ERROR_BAD_PATHNAME, ap_server_conf, APLOGNO(00413)
+                         "Parent: Failed to get full path of %s",
+                         ap_server_conf->process->argv[0]);
+            apr_pool_destroy(ptemp);
+            return -1;
+        }
+
+        args = malloc((ap_server_conf->process->argc + 1) * sizeof (char*));
+        memcpy(args + 1, ap_server_conf->process->argv + 1,
+               (ap_server_conf->process->argc - 1) * sizeof (char*));
+        args[0] = malloc(strlen(cmd) + 1);
+        strcpy(args[0], cmd);
+        args[ap_server_conf->process->argc] = NULL;
+    }
+    else {
+        cmd = args[0];
+    }
+
+    /* Create a pipe to send handles to the child */
+    if ((rv = apr_procattr_io_set(attr, APR_FULL_BLOCK,
+                                  APR_NO_PIPE, APR_NO_PIPE)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00414)
+                        "Parent: Unable to create child stdin pipe.");
+        apr_pool_destroy(ptemp);
+        return -1;
+    }
+
+    /* Create the child_ready_event */
+    waitlist[waitlist_ready] = CreateEvent(NULL, TRUE, FALSE, NULL);
+    if (!waitlist[waitlist_ready]) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00415)
+                     "Parent: Could not create ready event for child process");
+        apr_pool_destroy (ptemp);
+        return -1;
+    }
+
+    /* Create the child_exit_event */
+    hExitEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+    if (!hExitEvent) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00416)
+                     "Parent: Could not create exit event for child process");
+        apr_pool_destroy(ptemp);
+        CloseHandle(waitlist[waitlist_ready]);
+        return -1;
+    }
+
+    /* Build the env array */
+    for (envc = 0; _environ[envc]; ++envc) {
+        ;
+    }
+    env = apr_palloc(ptemp, (envc + 2) * sizeof (char*));
+    memcpy(env, _environ, envc * sizeof (char*));
+    apr_snprintf(pidbuf, sizeof(pidbuf), "AP_PARENT_PID=%lu", parent_pid);
+    env[envc] = pidbuf;
+    env[envc + 1] = NULL;
+
+    rv = apr_proc_create(&new_child, cmd, (const char * const *)args,
+                         (const char * const *)env, attr, ptemp);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00417)
+                     "Parent: Failed to create the child process.");
+        apr_pool_destroy(ptemp);
+        CloseHandle(hExitEvent);
+        CloseHandle(waitlist[waitlist_ready]);
+        CloseHandle(new_child.hproc);
+        return -1;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00418)
+                 "Parent: Created child process %d", new_child.pid);
+
+    if (send_handles_to_child(ptemp, waitlist[waitlist_ready], hExitEvent,
+                              start_mutex, ap_scoreboard_shm,
+                              new_child.hproc, new_child.in)) {
+        /*
+         * This error is fatal, mop up the child and move on
+         * We toggle the child's exit event to cause this child
+         * to quit even as it is attempting to start.
+         */
+        SetEvent(hExitEvent);
+        apr_pool_destroy(ptemp);
+        CloseHandle(hExitEvent);
+        CloseHandle(waitlist[waitlist_ready]);
+        CloseHandle(new_child.hproc);
+        return -1;
+    }
+
+    /* Important:
+     * Give the child process a chance to run before dup'ing the sockets.
+     * We have already set the listening sockets noninheritable, but if
+     * WSADuplicateSocket runs before the child process initializes
+     * the listeners will be inherited anyway.
+     */
+    waitlist[waitlist_term] = new_child.hproc;
+    rv = WaitForMultipleObjects(2, waitlist, FALSE, INFINITE);
+    CloseHandle(waitlist[waitlist_ready]);
+    if (rv != WAIT_OBJECT_0) {
+        /*
+         * Outch... that isn't a ready signal. It's dead, Jim!
+         */
+        SetEvent(hExitEvent);
+        apr_pool_destroy(ptemp);
+        CloseHandle(hExitEvent);
+        CloseHandle(new_child.hproc);
+        return -1;
+    }
+
+    if (send_listeners_to_child(ptemp, new_child.pid, new_child.in)) {
+        /*
+         * This error is fatal, mop up the child and move on
+         * We toggle the child's exit event to cause this child
+         * to quit even as it is attempting to start.
+         */
+        SetEvent(hExitEvent);
+        apr_pool_destroy(ptemp);
+        CloseHandle(hExitEvent);
+        CloseHandle(new_child.hproc);
+        return -1;
+    }
+
+    apr_file_close(new_child.in);
+
+    *child_exit_event = hExitEvent;
+    *child_proc = new_child.hproc;
+    *child_pid = new_child.pid;
+
+    return 0;
+}
+
+/***********************************************************************
+ * master_main()
+ * master_main() runs in the parent process.  It creates the child
+ * process which handles HTTP requests then waits on one of three
+ * events:
+ *
+ * restart_event
+ * -------------
+ * The restart event causes master_main to start a new child process and
+ * tells the old child process to exit (by setting the child_exit_event).
+ * The restart event is set as a result of one of the following:
+ * 1. An apache -k restart command on the command line
+ * 2. A command received from Windows service manager which gets
+ *    translated into an ap_signal_parent(SIGNAL_PARENT_RESTART)
+ *    call by code in service.c.
+ * 3. The child process calling ap_signal_parent(SIGNAL_PARENT_RESTART)
+ *    as a result of hitting MaxConnectionsPerChild.
+ *
+ * shutdown_event
+ * --------------
+ * The shutdown event causes master_main to tell the child process to
+ * exit and that the server is shutting down. The shutdown event is
+ * set as a result of one of the following:
+ * 1. An apache -k shutdown command on the command line
+ * 2. A command received from Windows service manager which gets
+ *    translated into an ap_signal_parent(SIGNAL_PARENT_SHUTDOWN)
+ *    call by code in service.c.
+ *
+ * child process handle
+ * --------------------
+ * The child process handle will be signaled if the child process
+ * exits for any reason. In a normal running server, the signaling
+ * of this event means that the child process has exited prematurely
+ * due to a seg fault or other irrecoverable error. For server
+ * robustness, master_main will restart the child process under this
+ * condtion.
+ *
+ * master_main uses the child_exit_event to signal the child process
+ * to exit.
+ **********************************************************************/
+#define NUM_WAIT_HANDLES 3
+#define CHILD_HANDLE     0
+#define SHUTDOWN_HANDLE  1
+#define RESTART_HANDLE   2
+static int master_main(server_rec *s, HANDLE shutdown_event, HANDLE restart_event)
+{
+    int rv, cld;
+    int child_created;
+    int restart_pending;
+    int shutdown_pending;
+    HANDLE child_exit_event;
+    HANDLE event_handles[NUM_WAIT_HANDLES];
+    DWORD child_pid;
+
+    child_created = restart_pending = shutdown_pending = 0;
+
+    event_handles[SHUTDOWN_HANDLE] = shutdown_event;
+    event_handles[RESTART_HANDLE] = restart_event;
+
+    /* Create a single child process */
+    rv = create_process(pconf, &event_handles[CHILD_HANDLE],
+                        &child_exit_event, &child_pid);
+    if (rv < 0)
+    {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00419)
+                     "master_main: create child process failed. Exiting.");
+        shutdown_pending = 1;
+        goto die_now;
+    }
+
+    child_created = 1;
+
+    if (!strcasecmp(signal_arg, "runservice")) {
+        mpm_service_started();
+    }
+
+    /* Update the scoreboard. Note that there is only a single active
+     * child at once.
+     */
+    ap_scoreboard_image->parent[0].quiescing = 0;
+    winnt_note_child_started(/* slot */ 0, child_pid);
+
+    /* Wait for shutdown or restart events or for child death */
+    winnt_mpm_state = AP_MPMQ_RUNNING;
+    rv = WaitForMultipleObjects(NUM_WAIT_HANDLES, (HANDLE *) event_handles, FALSE, INFINITE);
+    cld = rv - WAIT_OBJECT_0;
+    if (rv == WAIT_FAILED) {
+        /* Something serious is wrong */
+        ap_log_error(APLOG_MARK,APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00420)
+                     "master_main: WaitForMultipleObjects WAIT_FAILED -- doing server shutdown");
+        shutdown_pending = 1;
+    }
+    else if (rv == WAIT_TIMEOUT) {
+        /* Hey, this cannot happen */
+        ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s, APLOGNO(00421)
+                     "master_main: WaitForMultipleObjects with INFINITE wait exited with WAIT_TIMEOUT");
+        shutdown_pending = 1;
+    }
+    else if (cld == SHUTDOWN_HANDLE) {
+        /* shutdown_event signalled */
+        shutdown_pending = 1;
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, s, APLOGNO(00422)
+                     "Parent: Received shutdown signal -- Shutting down the server.");
+        if (ResetEvent(shutdown_event) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s, APLOGNO(00423)
+                         "ResetEvent(shutdown_event)");
+        }
+    }
+    else if (cld == RESTART_HANDLE) {
+        /* Received a restart event. Prepare the restart_event to be reused
+         * then signal the child process to exit.
+         */
+        restart_pending = 1;
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(00424)
+                     "Parent: Received restart signal -- Restarting the server.");
+        if (ResetEvent(restart_event) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s, APLOGNO(00425)
+                         "Parent: ResetEvent(restart_event) failed.");
+        }
+        if (SetEvent(child_exit_event) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s, APLOGNO(00426)
+                         "Parent: SetEvent for child process event %pp failed.",
+                         event_handles[CHILD_HANDLE]);
+        }
+        /* Don't wait to verify that the child process really exits,
+         * just move on with the restart.
+         */
+        CloseHandle(event_handles[CHILD_HANDLE]);
+        event_handles[CHILD_HANDLE] = NULL;
+    }
+    else {
+        /* The child process exited prematurely due to a fatal error. */
+        DWORD exitcode;
+        if (!GetExitCodeProcess(event_handles[CHILD_HANDLE], &exitcode)) {
+            /* HUH? We did exit, didn't we? */
+            exitcode = APEXIT_CHILDFATAL;
+        }
+        if (   exitcode == APEXIT_CHILDFATAL
+            || exitcode == APEXIT_CHILDINIT
+            || exitcode == APEXIT_INIT) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, 0, ap_server_conf, APLOGNO(00427)
+                         "Parent: child process %lu exited with status %lu -- Aborting.",
+                         child_pid, exitcode);
+            shutdown_pending = 1;
+        }
+        else {
+            int i;
+            restart_pending = 1;
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00428)
+                         "Parent: child process %lu exited with status %lu -- Restarting.",
+                         child_pid, exitcode);
+            for (i = 0; i < ap_threads_per_child; i++) {
+                ap_update_child_status_from_indexes(0, i, SERVER_DEAD, NULL);
+            }
+        }
+        CloseHandle(event_handles[CHILD_HANDLE]);
+        event_handles[CHILD_HANDLE] = NULL;
+    }
+
+    winnt_note_child_killed(/* slot */ 0);
+
+    if (restart_pending) {
+        ++my_generation;
+        ap_scoreboard_image->global->running_generation = my_generation;
+    }
+die_now:
+    if (shutdown_pending)
+    {
+        int timeout = 30000;  /* Timeout is milliseconds */
+        winnt_mpm_state = AP_MPMQ_STOPPING;
+
+        if (!child_created) {
+            return 0;  /* Tell the caller we do not want to restart */
+        }
+
+        /* This shutdown is only marginally graceful. We will give the
+         * child a bit of time to exit gracefully. If the time expires,
+         * the child will be wacked.
+         */
+        if (!strcasecmp(signal_arg, "runservice")) {
+            mpm_service_stopping();
+        }
+        /* Signal the child processes to exit */
+        if (SetEvent(child_exit_event) == 0) {
+                ap_log_error(APLOG_MARK,APLOG_ERR, apr_get_os_error(), ap_server_conf, APLOGNO(00429)
+                             "Parent: SetEvent for child process event %pp failed",
+                             event_handles[CHILD_HANDLE]);
+        }
+        if (event_handles[CHILD_HANDLE]) {
+            rv = WaitForSingleObject(event_handles[CHILD_HANDLE], timeout);
+            if (rv == WAIT_OBJECT_0) {
+                ap_log_error(APLOG_MARK,APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00430)
+                             "Parent: Child process %lu exited successfully.", child_pid);
+                CloseHandle(event_handles[CHILD_HANDLE]);
+                event_handles[CHILD_HANDLE] = NULL;
+            }
+            else {
+                ap_log_error(APLOG_MARK,APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00431)
+                             "Parent: Forcing termination of child process %lu",
+                             child_pid);
+                TerminateProcess(event_handles[CHILD_HANDLE], 1);
+                CloseHandle(event_handles[CHILD_HANDLE]);
+                event_handles[CHILD_HANDLE] = NULL;
+            }
+        }
+        CloseHandle(child_exit_event);
+        return 0;  /* Tell the caller we do not want to restart */
+    }
+    winnt_mpm_state = AP_MPMQ_STARTING;
+    CloseHandle(child_exit_event);
+    return 1;      /* Tell the caller we want a restart */
+}
+
+/* service_nt_main_fn needs to append the StartService() args
+ * outside of our call stack and thread as the service starts...
+ */
+apr_array_header_t *mpm_new_argv;
+
+/* Remember service_to_start failures to log and fail in pre_config.
+ * Remember inst_argc and inst_argv for installing or starting the
+ * service after we preflight the config.
+ */
+
+static int winnt_query(int query_code, int *result, apr_status_t *rv)
+{
+    *rv = APR_SUCCESS;
+    switch (query_code) {
+        case AP_MPMQ_MAX_DAEMON_USED:
+            *result = MAXIMUM_WAIT_OBJECTS;
+            break;
+        case AP_MPMQ_IS_THREADED:
+            *result = AP_MPMQ_STATIC;
+            break;
+        case AP_MPMQ_IS_FORKED:
+            *result = AP_MPMQ_NOT_SUPPORTED;
+            break;
+        case AP_MPMQ_HARD_LIMIT_DAEMONS:
+            *result = HARD_SERVER_LIMIT;
+            break;
+        case AP_MPMQ_HARD_LIMIT_THREADS:
+            *result = thread_limit;
+            break;
+        case AP_MPMQ_MAX_THREADS:
+            *result = ap_threads_per_child;
+            break;
+        case AP_MPMQ_MIN_SPARE_DAEMONS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MIN_SPARE_THREADS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MAX_SPARE_DAEMONS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MAX_SPARE_THREADS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MAX_REQUESTS_DAEMON:
+            *result = ap_max_requests_per_child;
+            break;
+        case AP_MPMQ_MAX_DAEMONS:
+            *result = 1;
+            break;
+        case AP_MPMQ_MPM_STATE:
+            *result = winnt_mpm_state;
+            break;
+        case AP_MPMQ_GENERATION:
+            *result = my_generation;
+            break;
+        default:
+            *rv = APR_ENOTIMPL;
+            break;
+    }
+    return OK;
+}
+
+static const char *winnt_get_name(void)
+{
+    return "WinNT";
+}
+
+#define SERVICE_UNSET (-1)
+static apr_status_t service_set = SERVICE_UNSET;
+static apr_status_t service_to_start_success;
+static int inst_argc;
+static const char * const *inst_argv;
+static const char *service_name = NULL;
+
+static void winnt_rewrite_args(process_rec *process)
+{
+    /* Handle the following SCM aspects in this phase:
+     *
+     *   -k runservice [transition in service context only]
+     *   -k install
+     *   -k config
+     *   -k uninstall
+     *   -k stop
+     *   -k shutdown (same as -k stop). Maintained for backward compatibility.
+     *
+     * We can't leave this phase until we know our identity
+     * and modify the command arguments appropriately.
+     *
+     * We do not care if the .conf file exists or is parsable when
+     * attempting to stop or uninstall a service.
+     */
+    apr_status_t rv;
+    char *def_server_root;
+    char *binpath;
+    char optbuf[3];
+    const char *opt_arg;
+    int fixed_args;
+    char *pid;
+    apr_getopt_t *opt;
+    int running_as_service = 1;
+    int errout = 0;
+    apr_file_t *nullfile;
+
+    pconf = process->pconf;
+
+    osver.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+    GetVersionEx(&osver);
+
+    /* We wish this was *always* a reservation, but sadly it wasn't so and
+     * we couldn't break a hard limit prior to NT Kernel 5.1
+     */
+    if (osver.dwPlatformId == VER_PLATFORM_WIN32_NT
+        && ((osver.dwMajorVersion > 5)
+         || ((osver.dwMajorVersion == 5) && (osver.dwMinorVersion > 0)))) {
+        stack_res_flag = STACK_SIZE_PARAM_IS_A_RESERVATION;
+    }
+
+    /* AP_PARENT_PID is only valid in the child */
+    pid = getenv("AP_PARENT_PID");
+    if (pid)
+    {
+        HANDLE filehand;
+        HANDLE hproc = GetCurrentProcess();
+        DWORD BytesRead;
+
+        /* This is the child */
+        my_pid = GetCurrentProcessId();
+        parent_pid = (DWORD) atol(pid);
+
+        /* Prevent holding open the (nonexistent) console */
+        ap_real_exit_code = 0;
+
+        /* The parent gave us stdin, we need to remember this
+         * handle, and no longer inherit it at our children
+         * (we can't slurp it up now, we just aren't ready yet).
+         * The original handle is closed below, at apr_file_dup2()
+         */
+        pipe = GetStdHandle(STD_INPUT_HANDLE);
+        if (DuplicateHandle(hproc, pipe,
+                            hproc, &filehand, 0, FALSE,
+                            DUPLICATE_SAME_ACCESS)) {
+            pipe = filehand;
+        }
+
+        /* The parent gave us stdout of the NUL device,
+         * and expects us to suck up stdin of all of our
+         * shared handles and data from the parent.
+         * Don't infect child processes with our stdin
+         * handle, use another handle to NUL!
+         */
+        {
+            apr_file_t *infile, *outfile;
+            if ((apr_file_open_stdout(&outfile, process->pool) == APR_SUCCESS)
+             && (apr_file_open_stdin(&infile, process->pool) == APR_SUCCESS))
+                apr_file_dup2(infile, outfile, process->pool);
+        }
+
+        /* This child needs the existing stderr opened for logging,
+         * already
+         */
+
+        /* Read this child's generation number as soon as now,
+         * so that further hooks can query it.
+         */
+        if (!ReadFile(pipe, &my_generation, sizeof(my_generation),
+                      &BytesRead, (LPOVERLAPPED) NULL)
+                || (BytesRead != sizeof(my_generation))) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), NULL, APLOGNO(02965)
+                         "Child: Unable to retrieve my generation from the parent");
+            exit(APEXIT_CHILDINIT);
+        }
+
+        /* The parent is responsible for providing the
+         * COMPLETE ARGUMENTS REQUIRED to the child.
+         *
+         * No further argument parsing is needed, but
+         * for good measure we will provide a simple
+         * signal string for later testing.
+         */
+        signal_arg = "runchild";
+        return;
+    }
+
+    /* This is the parent, we have a long way to go :-) */
+    parent_pid = my_pid = GetCurrentProcessId();
+
+    /* This behavior is voided by setting real_exit_code to 0 */
+    atexit(hold_console_open_on_error);
+
+    /* Rewrite process->argv[];
+     *
+     * strip out -k signal into signal_arg
+     * strip out -n servicename and set the names
+     * add default -d serverroot from the path of this executable
+     *
+     * The end result will look like:
+     *
+     * The invocation command (%0)
+     *     The -d serverroot default from the running executable
+     *         The requested service's (-n) registry ConfigArgs
+     *             The WinNT SCM's StartService() args
+     */
+    if ((rv = ap_os_proc_filepath(&binpath, process->pconf))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK,APLOG_CRIT, rv, NULL, APLOGNO(00432)
+                     "Failed to get the full path of %s", process->argv[0]);
+        exit(APEXIT_INIT);
+    }
+    /* WARNING: There is an implict assumption here that the
+     * executable resides in ServerRoot or ServerRoot\bin
+     */
+    def_server_root = (char *) apr_filepath_name_get(binpath);
+    if (def_server_root > binpath) {
+        *(def_server_root - 1) = '\0';
+        def_server_root = (char *) apr_filepath_name_get(binpath);
+        if (!strcasecmp(def_server_root, "bin"))
+            *(def_server_root - 1) = '\0';
+    }
+    apr_filepath_merge(&def_server_root, NULL, binpath,
+                       APR_FILEPATH_TRUENAME, process->pool);
+
+    /* Use process->pool so that the rewritten argv
+     * lasts for the lifetime of the server process,
+     * because pconf will be destroyed after the
+     * initial pre-flight of the config parser.
+     */
+    mpm_new_argv = apr_array_make(process->pool, process->argc + 2,
+                                  sizeof(const char *));
+    *(const char **)apr_array_push(mpm_new_argv) = process->argv[0];
+    *(const char **)apr_array_push(mpm_new_argv) = "-d";
+    *(const char **)apr_array_push(mpm_new_argv) = def_server_root;
+
+    fixed_args = mpm_new_argv->nelts;
+
+    optbuf[0] = '-';
+    optbuf[2] = '\0';
+    apr_getopt_init(&opt, process->pool, process->argc, process->argv);
+    opt->errfn = NULL;
+    while ((rv = apr_getopt(opt, "wn:k:" AP_SERVER_BASEARGS,
+                            optbuf + 1, &opt_arg)) == APR_SUCCESS) {
+        switch (optbuf[1]) {
+
+        /* Shortcuts; include the -w option to hold the window open on error.
+         * This must not be toggled once we reset ap_real_exit_code to 0!
+         */
+        case 'w':
+            if (ap_real_exit_code)
+                ap_real_exit_code = 2;
+            break;
+
+        case 'n':
+            service_set = mpm_service_set_name(process->pool, &service_name,
+                                               opt_arg);
+            break;
+
+        case 'k':
+            signal_arg = opt_arg;
+            break;
+
+        case 'E':
+            errout = 1;
+            /* Fall through so the Apache main() handles the 'E' arg */
+        default:
+            *(const char **)apr_array_push(mpm_new_argv) =
+                apr_pstrdup(process->pool, optbuf);
+
+            if (opt_arg) {
+                *(const char **)apr_array_push(mpm_new_argv) = opt_arg;
+            }
+            break;
+        }
+    }
+
+    /* back up to capture the bad argument */
+    if (rv == APR_BADCH || rv == APR_BADARG) {
+        opt->ind--;
+    }
+
+    while (opt->ind < opt->argc) {
+        *(const char **)apr_array_push(mpm_new_argv) =
+            apr_pstrdup(process->pool, opt->argv[opt->ind++]);
+    }
+
+    /* Track the number of args actually entered by the user */
+    inst_argc = mpm_new_argv->nelts - fixed_args;
+
+    /* Provide a default 'run' -k arg to simplify signal_arg tests */
+    if (!signal_arg)
+    {
+        signal_arg = "run";
+        running_as_service = 0;
+    }
+
+    if (!strcasecmp(signal_arg, "runservice"))
+    {
+        /* Start the NT Service _NOW_ because the WinNT SCM is
+         * expecting us to rapidly assume control of our own
+         * process, the SCM will tell us our service name, and
+         * may have extra StartService() command arguments to
+         * add for us.
+         *
+         * The SCM will generally invoke the executable with
+         * the c:\win\system32 default directory.  This is very
+         * lethal if folks use ServerRoot /foopath on windows
+         * without a drive letter.  Change to the default root
+         * (path to apache root, above /bin) for safety.
+         */
+        apr_filepath_set(def_server_root, process->pool);
+
+        /* Any other process has a console, so we don't to begin
+         * a Win9x service until the configuration is parsed and
+         * any command line errors are reported.
+         *
+         * We hold the return value so that we can die in pre_config
+         * after logging begins, and the failure can land in the log.
+         */
+        if (!errout) {
+            mpm_nt_eventlog_stderr_open(service_name, process->pool);
+        }
+        service_to_start_success = mpm_service_to_start(&service_name,
+                                                        process->pool);
+        if (service_to_start_success == APR_SUCCESS) {
+            service_set = APR_SUCCESS;
+        }
+
+        /* Open a null handle to soak stdout in this process.
+         * Windows service processes are missing any file handle
+         * usable for stdin/out/err.  This was the cause of later
+         * trouble with invocations of apr_file_open_stdout()
+         */
+        if ((rv = apr_file_open(&nullfile, "NUL",
+                                APR_READ | APR_WRITE, APR_OS_DEFAULT,
+                                process->pool)) == APR_SUCCESS) {
+            apr_file_t *nullstdout;
+            if (apr_file_open_stdout(&nullstdout, process->pool)
+                    == APR_SUCCESS)
+                apr_file_dup2(nullstdout, nullfile, process->pool);
+            apr_file_close(nullfile);
+        }
+    }
+
+    /* Get the default for any -k option, except run */
+    if (service_set == SERVICE_UNSET && strcasecmp(signal_arg, "run")) {
+        service_set = mpm_service_set_name(process->pool, &service_name,
+                                           AP_DEFAULT_SERVICE_NAME);
+    }
+
+    if (!strcasecmp(signal_arg, "install")) /* -k install */
+    {
+        if (service_set == APR_SUCCESS)
+        {
+            ap_log_error(APLOG_MARK,APLOG_ERR, 0, NULL, APLOGNO(00433)
+                 "%s: Service is already installed.", service_name);
+            exit(APEXIT_INIT);
+        }
+    }
+    else if (running_as_service)
+    {
+        if (service_set == APR_SUCCESS)
+        {
+            /* Attempt to Uninstall, or stop, before
+             * we can read the arguments or .conf files
+             */
+            if (!strcasecmp(signal_arg, "uninstall")) {
+                rv = mpm_service_uninstall();
+                exit(rv);
+            }
+
+            if ((!strcasecmp(signal_arg, "stop")) ||
+                (!strcasecmp(signal_arg, "shutdown"))) {
+                mpm_signal_service(process->pool, 0);
+                exit(0);
+            }
+
+            rv = mpm_merge_service_args(process->pool, mpm_new_argv,
+                                        fixed_args);
+            if (rv == APR_SUCCESS) {
+                ap_log_error(APLOG_MARK,APLOG_INFO, 0, NULL, APLOGNO(00434)
+                             "Using ConfigArgs of the installed service "
+                             "\"%s\".", service_name);
+            }
+            else  {
+                ap_log_error(APLOG_MARK,APLOG_WARNING, rv, NULL, APLOGNO(00435)
+                             "No installed ConfigArgs for the service "
+                             "\"%s\", using Apache defaults.", service_name);
+            }
+        }
+        else
+        {
+            ap_log_error(APLOG_MARK,APLOG_ERR, service_set, NULL, APLOGNO(00436)
+                 "No installed service named \"%s\".", service_name);
+            exit(APEXIT_INIT);
+        }
+    }
+    if (strcasecmp(signal_arg, "install") && service_set && service_set != SERVICE_UNSET)
+    {
+        ap_log_error(APLOG_MARK,APLOG_ERR, service_set, NULL, APLOGNO(00437)
+             "No installed service named \"%s\".", service_name);
+        exit(APEXIT_INIT);
+    }
+
+    /* Track the args actually entered by the user.
+     * These will be used for the -k install parameters, as well as
+     * for the -k start service override arguments.
+     */
+    inst_argv = (const char * const *)mpm_new_argv->elts
+        + mpm_new_argv->nelts - inst_argc;
+
+    /* Now, do service install or reconfigure then proceed to
+     * post_config to test the installed configuration.
+     */
+    if (!strcasecmp(signal_arg, "config")) { /* -k config */
+        /* Reconfigure the service */
+        rv = mpm_service_install(process->pool, inst_argc, inst_argv, 1);
+        if (rv != APR_SUCCESS) {
+            exit(rv);
+        }
+
+        fprintf(stderr,"Testing httpd.conf....\n");
+        fprintf(stderr,"Errors reported here must be corrected before the "
+                "service can be started.\n");
+    }
+    else if (!strcasecmp(signal_arg, "install")) { /* -k install */
+        /* Install the service */
+        rv = mpm_service_install(process->pool, inst_argc, inst_argv, 0);
+        if (rv != APR_SUCCESS) {
+            exit(rv);
+        }
+
+        fprintf(stderr,"Testing httpd.conf....\n");
+        fprintf(stderr,"Errors reported here must be corrected before the "
+                "service can be started.\n");
+    }
+
+    process->argc = mpm_new_argv->nelts;
+    process->argv = (const char * const *) mpm_new_argv->elts;
+}
+
+
+static int winnt_pre_config(apr_pool_t *pconf_, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+    /* Handle the following SCM aspects in this phase:
+     *
+     *   -k runservice [WinNT errors logged from rewrite_args]
+     */
+
+    /* Initialize shared static objects.
+     * TODO: Put config related statics into an sconf structure.
+     */
+    pconf = pconf_;
+
+    if (ap_exists_config_define("ONE_PROCESS") ||
+        ap_exists_config_define("DEBUG"))
+        one_process = -1;
+
+    /* XXX: presume proper privilages; one nice thing would be
+     * a loud emit if running as "LocalSystem"/"SYSTEM" to indicate
+     * they should change to a user with write access to logs/ alone.
+     */
+    ap_sys_privileges_handlers(1);
+
+    if (!strcasecmp(signal_arg, "runservice")
+            && (service_to_start_success != APR_SUCCESS)) {
+        ap_log_error(APLOG_MARK,APLOG_CRIT, service_to_start_success, NULL, APLOGNO(00438)
+                     "%s: Unable to start the service manager.",
+                     service_name);
+        exit(APEXIT_INIT);
+    }
+    else if (ap_state_query(AP_SQ_RUN_MODE) == AP_SQ_RM_NORMAL
+             && !one_process && !my_generation) {
+        /* Open a null handle to soak stdout in this process.
+         * We need to emulate apr_proc_detach, unix performs this
+         * same check in the pre_config hook (although it is
+         * arguably premature).  Services already fixed this.
+         */
+        apr_file_t *nullfile;
+        apr_status_t rv;
+        apr_pool_t *pproc = apr_pool_parent_get(pconf);
+
+        if ((rv = apr_file_open(&nullfile, "NUL",
+                                APR_READ | APR_WRITE, APR_OS_DEFAULT,
+                                pproc)) == APR_SUCCESS) {
+            apr_file_t *nullstdout;
+            if (apr_file_open_stdout(&nullstdout, pproc)
+                    == APR_SUCCESS)
+                apr_file_dup2(nullstdout, nullfile, pproc);
+            apr_file_close(nullfile);
+        }
+    }
+
+    ap_listen_pre_config();
+    thread_limit = DEFAULT_THREAD_LIMIT;
+    ap_threads_per_child = DEFAULT_THREADS_PER_CHILD;
+
+    return OK;
+}
+
+static int winnt_check_config(apr_pool_t *pconf, apr_pool_t *plog,
+                              apr_pool_t *ptemp, server_rec* s)
+{
+    int is_parent;
+    int startup = 0;
+
+    /* We want this only in the parent and only the first time around */
+    is_parent = (parent_pid == my_pid);
+    if (is_parent &&
+        ap_state_query(AP_SQ_MAIN_STATE) == AP_SQ_MS_CREATE_PRE_CONFIG) {
+        startup = 1;
+    }
+
+    if (thread_limit > MAX_THREAD_LIMIT) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00439)
+                         "WARNING: ThreadLimit of %d exceeds compile-time "
+                         "limit of %d threads, decreasing to %d.",
+                         thread_limit, MAX_THREAD_LIMIT, MAX_THREAD_LIMIT);
+        } else if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00440)
+                         "ThreadLimit of %d exceeds compile-time limit "
+                         "of %d, decreasing to match",
+                         thread_limit, MAX_THREAD_LIMIT);
+        }
+        thread_limit = MAX_THREAD_LIMIT;
+    }
+    else if (thread_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00441)
+                         "WARNING: ThreadLimit of %d not allowed, "
+                         "increasing to 1.", thread_limit);
+        } else if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00442)
+                         "ThreadLimit of %d not allowed, increasing to 1",
+                         thread_limit);
+        }
+        thread_limit = 1;
+    }
+
+    /* You cannot change ThreadLimit across a restart; ignore
+     * any such attempts.
+     */
+    if (!first_thread_limit) {
+        first_thread_limit = thread_limit;
+    }
+    else if (thread_limit != first_thread_limit) {
+        /* Don't need a startup console version here */
+        if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00443)
+                         "changing ThreadLimit to %d from original value "
+                         "of %d not allowed during restart",
+                         thread_limit, first_thread_limit);
+        }
+        thread_limit = first_thread_limit;
+    }
+
+    if (ap_threads_per_child > thread_limit) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00444)
+                         "WARNING: ThreadsPerChild of %d exceeds ThreadLimit "
+                         "of %d threads, decreasing to %d. To increase, please "
+                         "see the ThreadLimit directive.",
+                         ap_threads_per_child, thread_limit, thread_limit);
+        } else if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00445)
+                         "ThreadsPerChild of %d exceeds ThreadLimit "
+                         "of %d, decreasing to match",
+                         ap_threads_per_child, thread_limit);
+        }
+        ap_threads_per_child = thread_limit;
+    }
+    else if (ap_threads_per_child < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00446)
+                         "WARNING: ThreadsPerChild of %d not allowed, "
+                         "increasing to 1.", ap_threads_per_child);
+        } else if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00447)
+                         "ThreadsPerChild of %d not allowed, increasing to 1",
+                         ap_threads_per_child);
+        }
+        ap_threads_per_child = 1;
+    }
+
+    return OK;
+}
+
+static int winnt_post_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp, server_rec* s)
+{
+    apr_status_t rv = 0;
+
+    /* Handle the following SCM aspects in this phase:
+     *
+     *   -k install (catch and exit as install was handled in rewrite_args)
+     *   -k config  (catch and exit as config was handled in rewrite_args)
+     *   -k start
+     *   -k restart
+     *   -k runservice [Win95, only once - after we parsed the config]
+     *
+     * because all of these signals are useful _only_ if there
+     * is a valid conf\httpd.conf environment to start.
+     *
+     * We reached this phase by avoiding errors that would cause
+     * these options to fail unexpectedly in another process.
+     */
+
+    if (!strcasecmp(signal_arg, "install")) {
+        /* Service install happens in the rewrite_args hooks. If we
+         * made it this far, the server configuration is clean and the
+         * service will successfully start.
+         */
+        apr_pool_destroy(s->process->pool);
+        apr_terminate();
+        exit(0);
+    }
+    if (!strcasecmp(signal_arg, "config")) {
+        /* Service reconfiguration happens in the rewrite_args hooks. If we
+         * made it this far, the server configuration is clean and the
+         * service will successfully start.
+         */
+        apr_pool_destroy(s->process->pool);
+        apr_terminate();
+        exit(0);
+    }
+
+    if (!strcasecmp(signal_arg, "start")) {
+        ap_listen_rec *lr;
+
+        /* Close the listening sockets. */
+        for (lr = ap_listeners; lr; lr = lr->next) {
+            apr_socket_close(lr->sd);
+            lr->active = 0;
+        }
+        rv = mpm_service_start(ptemp, inst_argc, inst_argv);
+        apr_pool_destroy(s->process->pool);
+        apr_terminate();
+        exit (rv);
+    }
+
+    if (!strcasecmp(signal_arg, "restart")) {
+        mpm_signal_service(ptemp, 1);
+        apr_pool_destroy(s->process->pool);
+        apr_terminate();
+        exit (rv);
+    }
+
+    if (parent_pid == my_pid)
+    {
+        if (ap_state_query(AP_SQ_MAIN_STATE) != AP_SQ_MS_CREATE_PRE_CONFIG
+            && ap_state_query(AP_SQ_CONFIG_GEN) == 1)
+        {
+            /* This code should be run once in the parent and not run
+             * across a restart
+             */
+            PSECURITY_ATTRIBUTES sa = GetNullACL();  /* returns NULL if invalid (Win95?) */
+            setup_signal_names(apr_psprintf(pconf, "ap%lu", parent_pid));
+
+            ap_log_pid(pconf, ap_pid_fname);
+
+            /* Create shutdown event, apPID_shutdown, where PID is the parent
+             * Apache process ID. Shutdown is signaled by 'apache -k shutdown'.
+             */
+            shutdown_event = CreateEvent(sa, FALSE, FALSE, signal_shutdown_name);
+            if (!shutdown_event) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00448)
+                             "Parent: Cannot create shutdown event %s", signal_shutdown_name);
+                CleanNullACL((void *)sa);
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+
+            /* Create restart event, apPID_restart, where PID is the parent
+             * Apache process ID. Restart is signaled by 'apache -k restart'.
+             */
+            restart_event = CreateEvent(sa, FALSE, FALSE, signal_restart_name);
+            if (!restart_event) {
+                CloseHandle(shutdown_event);
+                ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00449)
+                             "Parent: Cannot create restart event %s", signal_restart_name);
+                CleanNullACL((void *)sa);
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+            CleanNullACL((void *)sa);
+
+            /* Create the start mutex, as an unnamed object for security.
+             * Ths start mutex is used during a restart to prevent more than
+             * one child process from entering the accept loop at once.
+             */
+            rv =  apr_proc_mutex_create(&start_mutex, NULL,
+                                        APR_LOCK_DEFAULT,
+                                        ap_server_conf->process->pool);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK,APLOG_ERR, rv, ap_server_conf, APLOGNO(00450)
+                             "%s: Unable to create the start_mutex.",
+                             service_name);
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+        }
+        /* Always reset our console handler to be the first, even on a restart
+        *  because some modules (e.g. mod_perl) might have set a console
+        *  handler to terminate the process.
+        */
+        if (strcasecmp(signal_arg, "runservice"))
+            mpm_start_console_handler();
+    }
+    else /* parent_pid != my_pid */
+    {
+        mpm_start_child_console_handler();
+    }
+    return OK;
+}
+
+/* This really should be a post_config hook, but the error log is already
+ * redirected by that point, so we need to do this in the open_logs phase.
+ */
+static int winnt_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
+{
+    /* Initialize shared static objects.
+     */
+    if (parent_pid != my_pid) {
+        return OK;
+    }
+
+    /* We cannot initialize our listeners if we are restarting
+     * (the parent process already has glomed on to them)
+     * nor should we do so for service reconfiguration
+     * (since the service may already be running.)
+     */
+    if (!strcasecmp(signal_arg, "restart")
+            || !strcasecmp(signal_arg, "config")) {
+        return OK;
+    }
+
+    if (ap_setup_listeners(s) < 1) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_STARTUP, 0,
+                     NULL, APLOGNO(00451) "no listening sockets available, shutting down");
+        return !OK;
+    }
+
+    return OK;
+}
+
+static void winnt_child_init(apr_pool_t *pchild, struct server_rec *s)
+{
+    apr_status_t rv;
+
+    setup_signal_names(apr_psprintf(pchild, "ap%lu", parent_pid));
+
+    /* This is a child process, not in single process mode */
+    if (!one_process) {
+        /* Set up events and the scoreboard */
+        get_handles_from_parent(s, &exit_event, &start_mutex,
+                                &ap_scoreboard_shm);
+
+        /* Set up the listeners */
+        get_listeners_from_parent(s);
+
+        /* Done reading from the parent, close that channel */
+        CloseHandle(pipe);
+    }
+    else {
+        /* Single process mode - this lock doesn't even need to exist */
+        rv = apr_proc_mutex_create(&start_mutex, signal_name_prefix,
+                                   APR_LOCK_DEFAULT, s->process->pool);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK,APLOG_ERR, rv, ap_server_conf, APLOGNO(00452)
+                         "%s child: Unable to init the start_mutex.",
+                         service_name);
+            exit(APEXIT_CHILDINIT);
+        }
+
+        /* Borrow the shutdown_even as our _child_ loop exit event */
+        exit_event = shutdown_event;
+    }
+}
+
+
+static int winnt_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s )
+{
+    static int restart = 0;            /* Default is "not a restart" */
+
+    /* ### If non-graceful restarts are ever introduced - we need to rerun
+     * the pre_mpm hook on subsequent non-graceful restarts.  But Win32
+     * has only graceful style restarts - and we need this hook to act
+     * the same on Win32 as on Unix.
+     */
+    if (!restart && ((parent_pid == my_pid) || one_process)) {
+        /* Set up the scoreboard. */
+        if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+            return !OK;
+        }
+    }
+
+    if ((parent_pid != my_pid) || one_process)
+    {
+        /* The child process or in one_process (debug) mode
+         */
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00453)
+                     "Child process is running");
+
+        child_main(pconf, parent_pid);
+
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00454)
+                     "Child process is exiting");
+        return DONE;
+    }
+    else
+    {
+        /* A real-honest to goodness parent */
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00455)
+                     "%s configured -- resuming normal operations",
+                     ap_get_server_description());
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00456)
+                     "Server built: %s", ap_get_server_built());
+        ap_log_command_line(plog, s);
+        ap_log_mpm_common(s);
+
+        restart = master_main(ap_server_conf, shutdown_event, restart_event);
+
+        if (!restart)
+        {
+            /* Shutting down. Clean up... */
+            ap_remove_pid(pconf, ap_pid_fname);
+            apr_proc_mutex_destroy(start_mutex);
+
+            CloseHandle(restart_event);
+            CloseHandle(shutdown_event);
+
+            return DONE;
+        }
+    }
+
+    return OK; /* Restart */
+}
+
+static void winnt_hooks(apr_pool_t *p)
+{
+    /* Our open_logs hook function must run before the core's, or stderr
+     * will be redirected to a file, and the messages won't print to the
+     * console.
+     */
+    static const char *const aszSucc[] = {"core.c", NULL};
+
+    ap_hook_pre_config(winnt_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_check_config(winnt_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_post_config(winnt_post_config, NULL, NULL, 0);
+    ap_hook_child_init(winnt_child_init, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_open_logs(winnt_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
+    ap_hook_mpm(winnt_run, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_query(winnt_query, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_get_name(winnt_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+AP_DECLARE_MODULE(mpm_winnt) = {
+    MPM20_MODULE_STUFF,
+    winnt_rewrite_args,    /* hook to run before apache parses args */
+    NULL,                  /* create per-directory config structure */
+    NULL,                  /* merge per-directory config structures */
+    NULL,                  /* create per-server config structure */
+    NULL,                  /* merge per-server config structures */
+    winnt_cmds,            /* command apr_table_t */
+    winnt_hooks            /* register_hooks */
+};
+
+#endif /* def WIN32 */
diff --git a/server/mpm/winnt/mpm_winnt.h b/server/mpm/winnt/mpm_winnt.h
new file mode 100644
index 0000000..22ba001
--- /dev/null
+++ b/server/mpm/winnt/mpm_winnt.h
@@ -0,0 +1,96 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file  mpm_winnt.h
+ * @brief WinNT MPM specific
+ *
+ * @addtogroup APACHE_MPM_WINNT
+ * @{
+ */
+
+#ifndef APACHE_MPM_WINNT_H
+#define APACHE_MPM_WINNT_H
+
+#include "apr_proc_mutex.h"
+#include "ap_listen.h"
+
+/* From service.c: */
+
+#define SERVICE_APACHE_RESTART 128
+
+#ifndef AP_DEFAULT_SERVICE_NAME
+#define AP_DEFAULT_SERVICE_NAME "Apache2.4"
+#endif
+
+#define SERVICECONFIG "System\\CurrentControlSet\\Services\\%s"
+#define SERVICEPARAMS "System\\CurrentControlSet\\Services\\%s\\Parameters"
+
+apr_status_t mpm_service_set_name(apr_pool_t *p, const char **display_name,
+                                                 const char *set_name);
+apr_status_t mpm_merge_service_args(apr_pool_t *p, apr_array_header_t *args,
+                                   int fixed_args);
+
+apr_status_t mpm_service_to_start(const char **display_name, apr_pool_t *p);
+apr_status_t mpm_service_started(void);
+apr_status_t mpm_service_install(apr_pool_t *ptemp, int argc,
+                                char const* const* argv, int reconfig);
+apr_status_t mpm_service_uninstall(void);
+
+apr_status_t mpm_service_start(apr_pool_t *ptemp, int argc,
+                              char const* const* argv);
+
+void mpm_signal_service(apr_pool_t *ptemp, int signal);
+
+void mpm_service_stopping(void);
+
+void mpm_start_console_handler(void);
+void mpm_start_child_console_handler(void);
+
+/* From nt_eventlog.c: */
+
+void mpm_nt_eventlog_stderr_open(const char *display_name, apr_pool_t *p);
+void mpm_nt_eventlog_stderr_flush(void);
+
+/* From mpm_winnt.c: */
+
+extern module AP_MODULE_DECLARE_DATA mpm_winnt_module;
+extern int ap_threads_per_child;
+
+extern DWORD my_pid;
+extern apr_proc_mutex_t *start_mutex;
+extern HANDLE exit_event;
+
+extern int winnt_mpm_state;
+extern OSVERSIONINFO osver;
+extern DWORD stack_res_flag;
+
+extern void clean_child_exit(int);
+
+typedef enum {
+    SIGNAL_PARENT_SHUTDOWN,
+    SIGNAL_PARENT_RESTART,
+    SIGNAL_PARENT_RESTART_GRACEFUL
+} ap_signal_parent_e;
+AP_DECLARE(void) ap_signal_parent(ap_signal_parent_e type);
+
+void hold_console_open_on_error(void);
+
+/* From child.c: */
+void child_main(apr_pool_t *pconf, DWORD parent_pid);
+
+#endif /* APACHE_MPM_WINNT_H */
+/** @} */
diff --git a/server/mpm/winnt/nt_eventlog.c b/server/mpm/winnt/nt_eventlog.c
new file mode 100644
index 0000000..e7e80d0
--- /dev/null
+++ b/server/mpm/winnt/nt_eventlog.c
@@ -0,0 +1,171 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "httpd.h"
+#include "http_log.h"
+#include "mpm_winnt.h"
+#include "apr_strings.h"
+#include "apr_lib.h"
+#include "apr_portable.h"
+#include "ap_regkey.h"
+
+static const char *display_name  = NULL;
+static HANDLE stderr_thread = NULL;
+static HANDLE stderr_ready;
+
+static DWORD WINAPI service_stderr_thread(LPVOID hPipe)
+{
+    HANDLE hPipeRead = (HANDLE) hPipe;
+    HANDLE hEventSource;
+    char errbuf[256];
+    char *errmsg = errbuf;
+    const char *errarg[9];
+    DWORD errres;
+    ap_regkey_t *regkey;
+    apr_status_t rv;
+    apr_pool_t *p;
+
+    apr_pool_create_ex(&p, NULL, NULL, NULL);
+
+    errarg[0] = "The Apache service named";
+    errarg[1] = display_name;
+    errarg[2] = "reported the following error:\r\n>>>";
+    errarg[3] = errbuf;
+    errarg[4] = NULL;
+    errarg[5] = NULL;
+    errarg[6] = NULL;
+    errarg[7] = NULL;
+    errarg[8] = NULL;
+
+    /* What are we going to do in here, bail on the user?  not. */
+    if ((rv = ap_regkey_open(&regkey, AP_REGKEY_LOCAL_MACHINE,
+                             "SYSTEM\\CurrentControlSet\\Services\\"
+                             "EventLog\\Application\\Apache Service",
+                             APR_READ | APR_WRITE | APR_CREATE, p))
+            == APR_SUCCESS)
+    {
+        DWORD dwData = EVENTLOG_ERROR_TYPE | EVENTLOG_WARNING_TYPE |
+                       EVENTLOG_INFORMATION_TYPE;
+
+        /* The stock message file */
+        ap_regkey_value_set(regkey, "EventMessageFile",
+                            "%SystemRoot%\\System32\\netmsg.dll",
+                            AP_REGKEY_EXPAND, p);
+
+        ap_regkey_value_raw_set(regkey, "TypesSupported", &dwData,
+                                sizeof(dwData), REG_DWORD, p);
+        ap_regkey_close(regkey);
+    }
+
+    hEventSource = RegisterEventSourceW(NULL, L"Apache Service");
+
+    SetEvent(stderr_ready);
+
+    while (ReadFile(hPipeRead, errmsg, 1, &errres, NULL) && (errres == 1))
+    {
+        if ((errmsg > errbuf) || !apr_isspace(*errmsg))
+        {
+            ++errmsg;
+            if ((*(errmsg - 1) == '\n')
+                    || (errmsg >= errbuf + sizeof(errbuf) - 1))
+            {
+                while ((errmsg > errbuf) && apr_isspace(*(errmsg - 1))) {
+                    --errmsg;
+                }
+                *errmsg = '\0';
+
+                /* Generic message: '%1 %2 %3 %4 %5 %6 %7 %8 %9'
+                 * The event code in netmsg.dll is 3299
+                 */
+                ReportEvent(hEventSource, EVENTLOG_ERROR_TYPE, 0,
+                            3299, NULL, 9, 0, errarg, NULL);
+                errmsg = errbuf;
+            }
+        }
+    }
+
+    if ((errres = GetLastError()) != ERROR_BROKEN_PIPE) {
+        apr_snprintf(errbuf, sizeof(errbuf),
+                     "Win32 error %lu reading stderr pipe stream\r\n",
+                     GetLastError());
+
+        ReportEvent(hEventSource, EVENTLOG_ERROR_TYPE, 0,
+                    3299, NULL, 9, 0, errarg, NULL);
+    }
+
+    CloseHandle(hPipeRead);
+    DeregisterEventSource(hEventSource);
+    CloseHandle(stderr_thread);
+    stderr_thread = NULL;
+    apr_pool_destroy(p);
+    return 0;
+}
+
+
+void mpm_nt_eventlog_stderr_flush(void)
+{
+    HANDLE cleanup_thread = stderr_thread;
+
+    if (cleanup_thread) {
+        HANDLE hErr = GetStdHandle(STD_ERROR_HANDLE);
+        fclose(stderr);
+        CloseHandle(hErr);
+        WaitForSingleObject(cleanup_thread, 30000);
+        CloseHandle(cleanup_thread);
+    }
+}
+
+
+void mpm_nt_eventlog_stderr_open(const char *argv0, apr_pool_t *p)
+{
+    SECURITY_ATTRIBUTES sa;
+    HANDLE hPipeRead = NULL;
+    HANDLE hPipeWrite = NULL;
+    DWORD  threadid;
+    apr_file_t *eventlog_file;
+    apr_file_t *stderr_file;
+
+    display_name = argv0;
+
+    /* Create a pipe to send stderr messages to the system error log.
+     *
+     * _dup2() duplicates the write handle inheritable for us.
+     */
+    sa.nLength = sizeof(sa);
+    sa.lpSecurityDescriptor = NULL;
+    sa.bInheritHandle = FALSE;
+    CreatePipe(&hPipeRead, &hPipeWrite, NULL, 0);
+    ap_assert(hPipeRead && hPipeWrite);
+
+    stderr_ready = CreateEvent(NULL, FALSE, FALSE, NULL);
+    stderr_thread = CreateThread(NULL, 65536, service_stderr_thread,
+                                 (LPVOID)hPipeRead, stack_res_flag, &threadid);
+    ap_assert(stderr_ready && stderr_thread);
+
+    WaitForSingleObject(stderr_ready, INFINITE);
+
+    if ((apr_file_open_stderr(&stderr_file, p)
+             == APR_SUCCESS)
+     && (apr_os_file_put(&eventlog_file, &hPipeWrite, APR_WRITE, p)
+             == APR_SUCCESS))
+        apr_file_dup2(stderr_file, eventlog_file, p);
+
+    /* The code above _will_ corrupt the StdHandle...
+     * and we must do so anyways.  We set this up only
+     * after we initialized the posix stderr API.
+     */
+    ap_open_stderr_log(p);
+}
diff --git a/server/mpm/winnt/service.c b/server/mpm/winnt/service.c
new file mode 100644
index 0000000..121aca1
--- /dev/null
+++ b/server/mpm/winnt/service.c
@@ -0,0 +1,1241 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* This module ALONE requires the window message API from user.h
+ * and the default APR include of windows.h will omit it, so
+ * preload the API symbols now...
+ */
+
+#define _WINUSER_
+
+#include "apr.h"
+#include "apr_strings.h"
+#include "apr_lib.h"
+#if APR_HAS_UNICODE_FS
+#include "arch/win32/apr_arch_utf8.h"
+#include "arch/win32/apr_arch_misc.h"
+#include <wchar.h>
+#endif
+
+#include "httpd.h"
+#include "http_log.h"
+#include "mpm_winnt.h"
+#include "ap_regkey.h"
+
+#ifdef NOUSER
+#undef NOUSER
+#endif
+#undef _WINUSER_
+#include <winuser.h>
+#include <time.h>
+
+APLOG_USE_MODULE(mpm_winnt);
+
+/* Todo; clear up statics */
+static char *mpm_service_name = NULL;
+static char *mpm_display_name = NULL;
+
+#if APR_HAS_UNICODE_FS
+static apr_wchar_t *mpm_service_name_w;
+#endif
+
+typedef struct nt_service_ctx_t
+{
+    HANDLE mpm_thread;       /* primary thread handle of the apache server */
+    HANDLE service_thread;   /* thread service/monitor handle */
+    DWORD  service_thread_id;/* thread service/monitor ID */
+    HANDLE service_init;     /* controller thread init mutex */
+    HANDLE service_term;     /* NT service thread kill signal */
+    SERVICE_STATUS ssStatus;
+    SERVICE_STATUS_HANDLE hServiceStatus;
+} nt_service_ctx_t;
+
+static nt_service_ctx_t globdat;
+
+static int ReportStatusToSCMgr(int currentState, int waitHint,
+                               nt_service_ctx_t *ctx);
+
+/* Rather than repeat this logic throughout, create an either-or wide or narrow
+ * implementation because we don't actually pass strings to OpenSCManager.
+ * This election is based on build time defines and runtime os version test.
+ */
+#undef OpenSCManager
+typedef SC_HANDLE (WINAPI *fpt_OpenSCManager)(const void *lpMachine,
+                                              const void *lpDatabase,
+                                              DWORD dwAccess);
+static fpt_OpenSCManager pfn_OpenSCManager = NULL;
+static APR_INLINE SC_HANDLE OpenSCManager(const void *lpMachine,
+                                          const void *lpDatabase,
+                                          DWORD dwAccess)
+{
+    if (!pfn_OpenSCManager) {
+#if APR_HAS_UNICODE_FS
+        IF_WIN_OS_IS_UNICODE
+            pfn_OpenSCManager = (fpt_OpenSCManager)OpenSCManagerW;
+#endif
+#if APR_HAS_ANSI_FS
+        ELSE_WIN_OS_IS_ANSI
+            pfn_OpenSCManager = (fpt_OpenSCManager)OpenSCManagerA;
+#endif
+    }
+    return (*(pfn_OpenSCManager))(lpMachine, lpDatabase, dwAccess); 
+}
+
+/* exit() for Win32 is macro mapped (horrible, we agree) that allows us
+ * to catch the non-zero conditions and inform the console process that
+ * the application died, and hang on to the console a bit longer.
+ *
+ * The macro only maps for http_main.c and other sources that include
+ * the service.h header, so we best assume it's an error to exit from
+ * _any_ other module.
+ *
+ * If ap_real_exit_code is reset to 0, it will not be set or trigger this
+ * behavior on exit.  All service and child processes are expected to
+ * reset this flag to zero to avoid undesirable side effects.
+ */
+AP_DECLARE_DATA int ap_real_exit_code = 1;
+
+void hold_console_open_on_error(void)
+{
+    HANDLE hConIn;
+    HANDLE hConErr;
+    DWORD result;
+    time_t start;
+    time_t remains;
+    char *msg = "Note the errors or messages above, "
+                "and press the <ESC> key to exit.  ";
+    CONSOLE_SCREEN_BUFFER_INFO coninfo;
+    INPUT_RECORD in;
+    char count[16];
+
+    if (!ap_real_exit_code)
+        return;
+    hConIn = GetStdHandle(STD_INPUT_HANDLE);
+    hConErr = GetStdHandle(STD_ERROR_HANDLE);
+    if ((hConIn == INVALID_HANDLE_VALUE) || (hConErr == INVALID_HANDLE_VALUE))
+        return;
+    if (!WriteConsole(hConErr, msg, (DWORD)strlen(msg), &result, NULL) 
+            || !result)
+        return;
+    if (!GetConsoleScreenBufferInfo(hConErr, &coninfo))
+        return;
+    if (!SetConsoleMode(hConIn, ENABLE_MOUSE_INPUT | 0x80))
+        return;
+
+    start = time(NULL);
+    do
+    {
+        while (PeekConsoleInput(hConIn, &in, 1, &result) && result)
+        {
+            if (!ReadConsoleInput(hConIn, &in, 1, &result) || !result)
+                return;
+            if ((in.EventType == KEY_EVENT) && in.Event.KeyEvent.bKeyDown
+                    && (in.Event.KeyEvent.uChar.AsciiChar == 27))
+                return;
+            if (in.EventType == MOUSE_EVENT
+                    && (in.Event.MouseEvent.dwEventFlags == DOUBLE_CLICK))
+                return;
+        }
+        remains = ((start + 30) - time(NULL));
+        sprintf(count, "%d...",
+                (int)remains); /* 30 or less, so can't overflow int */
+        if (!SetConsoleCursorPosition(hConErr, coninfo.dwCursorPosition))
+            return;
+        if (!WriteConsole(hConErr, count, (DWORD)strlen(count), &result, NULL)
+                || !result)
+            return;
+    }
+    while ((remains > 0) && WaitForSingleObject(hConIn, 1000) != WAIT_FAILED);
+}
+
+static BOOL CALLBACK console_control_handler(DWORD ctrl_type)
+{
+    switch (ctrl_type)
+    {
+        case CTRL_BREAK_EVENT:
+            fprintf(stderr, "Apache server restarting...\n");
+            ap_signal_parent(SIGNAL_PARENT_RESTART);
+            return TRUE;
+        case CTRL_C_EVENT:
+            fprintf(stderr, "Apache server interrupted...\n");
+            /* for Interrupt signals, shut down the server.
+             * Tell the system we have dealt with the signal
+             * without waiting for Apache to terminate.
+             */
+            ap_signal_parent(SIGNAL_PARENT_SHUTDOWN);
+            return TRUE;
+
+        case CTRL_CLOSE_EVENT:
+        case CTRL_LOGOFF_EVENT:
+        case CTRL_SHUTDOWN_EVENT:
+            /* for Terminate signals, shut down the server.
+             * Wait for Apache to terminate, but respond
+             * after a reasonable time to tell the system
+             * that we did attempt to shut ourself down.
+             */
+            fprintf(stderr, "Apache server shutdown initiated...\n");
+            ap_signal_parent(SIGNAL_PARENT_SHUTDOWN);
+            Sleep(30000);
+            return TRUE;
+    }
+
+    /* We should never get here, but this is (mostly) harmless */
+    return FALSE;
+}
+
+
+static void stop_console_handler(void)
+{
+    SetConsoleCtrlHandler(console_control_handler, FALSE);
+}
+
+
+void mpm_start_console_handler(void)
+{
+    SetConsoleCtrlHandler(console_control_handler, TRUE);
+    atexit(stop_console_handler);
+}
+
+
+void mpm_start_child_console_handler(void)
+{
+    FreeConsole();
+}
+
+
+/**********************************
+  WinNT service control management
+ **********************************/
+
+static int ReportStatusToSCMgr(int currentState, int waitHint,
+                               nt_service_ctx_t *ctx)
+{
+    int rv = APR_SUCCESS;
+
+    if (ctx->hServiceStatus)
+    {
+        if (currentState == SERVICE_RUNNING) {
+            ctx->ssStatus.dwWaitHint = 0;
+            ctx->ssStatus.dwCheckPoint = 0;
+            ctx->ssStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP
+                                             | SERVICE_ACCEPT_SHUTDOWN;
+        }
+        else if (currentState == SERVICE_STOPPED) {
+            ctx->ssStatus.dwWaitHint = 0;
+            ctx->ssStatus.dwCheckPoint = 0;
+            /* An unexpected exit?  Better to error! */
+            if (ctx->ssStatus.dwCurrentState != SERVICE_STOP_PENDING
+                    && !ctx->ssStatus.dwServiceSpecificExitCode)
+                ctx->ssStatus.dwServiceSpecificExitCode = 1;
+            if (ctx->ssStatus.dwServiceSpecificExitCode)
+                ctx->ssStatus.dwWin32ExitCode = ERROR_SERVICE_SPECIFIC_ERROR;
+        }
+        else {
+            ++ctx->ssStatus.dwCheckPoint;
+            ctx->ssStatus.dwControlsAccepted = 0;
+            if(waitHint)
+                ctx->ssStatus.dwWaitHint = waitHint;
+        }
+
+        ctx->ssStatus.dwCurrentState = currentState;
+
+        rv = SetServiceStatus(ctx->hServiceStatus, &ctx->ssStatus);
+    }
+    return(rv);
+}
+
+/* Note this works on Win2000 and later due to ChangeServiceConfig2
+ * Continue to test its existence, but at least drop the feature
+ * of revising service description tags prior to Win2000.
+ */
+
+/* borrowed from mpm_winnt.c */
+extern apr_pool_t *pconf;
+
+static void set_service_description(void)
+{
+    const char *full_description;
+    SC_HANDLE schSCManager;
+
+    /* Nothing to do if we are a console
+     */
+    if (!mpm_service_name)
+        return;
+
+    /* Time to fix up the description, upon each successful restart
+     */
+    full_description = ap_get_server_description();
+
+    if ((ChangeServiceConfig2) &&
+        (schSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT)))
+    {
+        SC_HANDLE schService;
+
+#if APR_HAS_UNICODE_FS
+        IF_WIN_OS_IS_UNICODE
+        {
+            schService = OpenServiceW(schSCManager,
+                                      (LPCWSTR)mpm_service_name_w,
+                                      SERVICE_CHANGE_CONFIG);
+        }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+        ELSE_WIN_OS_IS_ANSI
+        {
+            schService = OpenService(schSCManager, mpm_service_name,
+                                     SERVICE_CHANGE_CONFIG);
+        }
+#endif
+        if (schService) {
+            /* Cast is necessary, ChangeServiceConfig2 handles multiple
+             * object types, some volatile, some not.
+             */
+#if APR_HAS_UNICODE_FS
+            IF_WIN_OS_IS_UNICODE
+            {
+                apr_size_t slen = strlen(full_description) + 1;
+                apr_size_t wslen = slen;
+                apr_wchar_t *full_description_w = 
+                    (apr_wchar_t*)apr_palloc(pconf, 
+                                             wslen * sizeof(apr_wchar_t));
+                apr_status_t rv = apr_conv_utf8_to_ucs2(full_description, &slen,
+                                                        full_description_w,
+                                                        &wslen);
+                if ((rv != APR_SUCCESS) || slen
+                        || ChangeServiceConfig2W(schService, 1
+                                                 /*SERVICE_CONFIG_DESCRIPTION*/,
+                                                 (LPVOID) &full_description_w))
+                    full_description = NULL;
+            }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+            ELSE_WIN_OS_IS_ANSI
+            {
+                if (ChangeServiceConfig2(schService,
+                                         1 /* SERVICE_CONFIG_DESCRIPTION */,
+                                         (LPVOID) &full_description))
+                    full_description = NULL;
+            }
+#endif
+            CloseServiceHandle(schService);
+        }
+        CloseServiceHandle(schSCManager);
+    }
+}
+
+/* handle the SCM's ControlService() callbacks to our service */
+
+static DWORD WINAPI service_nt_ctrl(DWORD dwCtrlCode, DWORD dwEventType,
+                                    LPVOID lpEventData, LPVOID lpContext)
+{
+    nt_service_ctx_t *ctx = lpContext;
+
+    /* SHUTDOWN is offered before STOP, accept the first opportunity */
+    if ((dwCtrlCode == SERVICE_CONTROL_STOP)
+         || (dwCtrlCode == SERVICE_CONTROL_SHUTDOWN))
+    {
+        ap_signal_parent(SIGNAL_PARENT_SHUTDOWN);
+        ReportStatusToSCMgr(SERVICE_STOP_PENDING, 30000, ctx);
+        return (NO_ERROR);
+    }
+    if (dwCtrlCode == SERVICE_APACHE_RESTART)
+    {
+        ap_signal_parent(SIGNAL_PARENT_RESTART);
+        ReportStatusToSCMgr(SERVICE_START_PENDING, 30000, ctx);
+        return (NO_ERROR);
+    }
+    if (dwCtrlCode == SERVICE_CONTROL_INTERROGATE) {
+        ReportStatusToSCMgr(globdat.ssStatus.dwCurrentState, 0, ctx);
+        return (NO_ERROR);
+    }
+
+    return (ERROR_CALL_NOT_IMPLEMENTED);
+}
+
+
+/* service_nt_main_fn is outside of the call stack and outside of the
+ * primary server thread... so now we _really_ need a placeholder!
+ * The winnt_rewrite_args has created and shared mpm_new_argv with us.
+ */
+extern apr_array_header_t *mpm_new_argv;
+
+#if APR_HAS_UNICODE_FS
+static void __stdcall service_nt_main_fn_w(DWORD argc, LPWSTR *argv)
+{
+    const char *ignored;
+    nt_service_ctx_t *ctx = &globdat;
+    char *service_name;
+    apr_size_t wslen = wcslen(argv[0]) + 1;
+    apr_size_t slen = wslen * 3 - 2;
+
+    service_name = malloc(slen);
+    (void)apr_conv_ucs2_to_utf8(argv[0], &wslen, service_name, &slen);
+
+    /* args and service names live in the same pool */
+    mpm_service_set_name(mpm_new_argv->pool, &ignored, service_name);
+
+    memset(&ctx->ssStatus, 0, sizeof(ctx->ssStatus));
+    ctx->ssStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
+    ctx->ssStatus.dwCurrentState = SERVICE_START_PENDING;
+    ctx->ssStatus.dwCheckPoint = 1;
+    if (!(ctx->hServiceStatus = 
+              RegisterServiceCtrlHandlerExW(argv[0], service_nt_ctrl, ctx)))
+    {
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, 
+                     apr_get_os_error(), NULL, 
+                     APLOGNO(00365) "Failure registering service handler");
+        return;
+    }
+
+    /* Report status, no errors, and buy 3 more seconds */
+    ReportStatusToSCMgr(SERVICE_START_PENDING, 30000, ctx);
+
+    /* We need to append all the command arguments passed via StartService()
+     * to our running service... which just got here via the SCM...
+     * but we have no interest in argv[0] for the mpm_new_argv list.
+     */
+    if (argc > 1)
+    {
+        char **cmb_data, **cmb;
+        DWORD i;
+
+        mpm_new_argv->nalloc = mpm_new_argv->nelts + argc - 1;
+        cmb_data = malloc(mpm_new_argv->nalloc * sizeof(const char *));
+
+        /* mpm_new_argv remains first (of lower significance) */
+        memcpy (cmb_data, mpm_new_argv->elts,
+                mpm_new_argv->elt_size * mpm_new_argv->nelts);
+
+        /* Service args follow from StartService() invocation */
+        memcpy (cmb_data + mpm_new_argv->nelts, argv + 1,
+                mpm_new_argv->elt_size * (argc - 1));
+
+        cmb = cmb_data + mpm_new_argv->nelts;
+
+        for (i = 1; i < argc; ++i)
+        {
+            wslen = wcslen(argv[i]) + 1;
+            slen = wslen * 3 - 2;
+            service_name = malloc(slen);
+            (void)apr_conv_ucs2_to_utf8(argv[i], &wslen, *(cmb++), &slen);
+        }
+
+        /* The replacement arg list is complete */
+        mpm_new_argv->elts = (char *)cmb_data;
+        mpm_new_argv->nelts = mpm_new_argv->nalloc;
+    }
+
+    /* Let the main thread continue now... but hang on to the
+     * signal_monitor event so we can take further action
+     */
+    SetEvent(ctx->service_init);
+
+    WaitForSingleObject(ctx->service_term, INFINITE);
+}
+#endif /* APR_HAS_UNICODE_FS */
+
+
+#if APR_HAS_ANSI_FS
+static void __stdcall service_nt_main_fn(DWORD argc, LPSTR *argv)
+{
+    const char *ignored;
+    nt_service_ctx_t *ctx = &globdat;
+
+    /* args and service names live in the same pool */
+    mpm_service_set_name(mpm_new_argv->pool, &ignored, argv[0]);
+
+    memset(&ctx->ssStatus, 0, sizeof(ctx->ssStatus));
+    ctx->ssStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
+    ctx->ssStatus.dwCurrentState = SERVICE_START_PENDING;
+    ctx->ssStatus.dwCheckPoint = 1;
+
+    if (!(ctx->hServiceStatus = 
+              RegisterServiceCtrlHandlerExA(argv[0], service_nt_ctrl, ctx)))
+        {
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, 
+                     apr_get_os_error(), NULL, 
+                     APLOGNO(10008) "Failure registering service handler");
+        return;
+    }
+
+    /* Report status, no errors, and buy 3 more seconds */
+    ReportStatusToSCMgr(SERVICE_START_PENDING, 30000, ctx);
+
+    /* We need to append all the command arguments passed via StartService()
+     * to our running service... which just got here via the SCM...
+     * but we have no interest in argv[0] for the mpm_new_argv list.
+     */
+    if (argc > 1)
+    {
+        char **cmb_data;
+
+        mpm_new_argv->nalloc = mpm_new_argv->nelts + argc - 1;
+        cmb_data = malloc(mpm_new_argv->nalloc * sizeof(const char *));
+
+        /* mpm_new_argv remains first (of lower significance) */
+        memcpy (cmb_data, mpm_new_argv->elts,
+                mpm_new_argv->elt_size * mpm_new_argv->nelts);
+
+        /* Service args follow from StartService() invocation */
+        memcpy (cmb_data + mpm_new_argv->nelts, argv + 1,
+                mpm_new_argv->elt_size * (argc - 1));
+
+        /* The replacement arg list is complete */
+        mpm_new_argv->elts = (char *)cmb_data;
+        mpm_new_argv->nelts = mpm_new_argv->nalloc;
+    }
+
+    /* Let the main thread continue now... but hang on to the
+     * signal_monitor event so we can take further action
+     */
+    SetEvent(ctx->service_init);
+
+    WaitForSingleObject(ctx->service_term, INFINITE);
+}
+#endif
+
+
+ static DWORD WINAPI service_nt_dispatch_thread(LPVOID nada)
+ {
+#if APR_HAS_UNICODE_FS
+    SERVICE_TABLE_ENTRYW dispatchTable_w[] =
+    {
+        { L"", service_nt_main_fn_w },
+        { NULL, NULL }
+    };
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+    SERVICE_TABLE_ENTRYA dispatchTable[] =
+    {
+        { "", service_nt_main_fn },
+        { NULL, NULL }
+    };
+#endif
+    apr_status_t rv;
+ 
+#if APR_HAS_UNICODE_FS
+    IF_WIN_OS_IS_UNICODE
+        rv = StartServiceCtrlDispatcherW(dispatchTable_w);
+#endif
+#if APR_HAS_ANSI_FS
+    ELSE_WIN_OS_IS_ANSI
+         rv = StartServiceCtrlDispatcherA(dispatchTable);
+#endif
+    if (rv) {
+        rv = APR_SUCCESS;
+    }
+    else {
+        /* This is a genuine failure of the SCM. */
+        rv = apr_get_os_error();
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                     APLOGNO(00366) "Error starting Windows service control "
+                     "dispatcher");
+    }
+    return (rv);
+}
+
+
+/* The service configuration's is stored under the following trees:
+ *
+ * HKLM\System\CurrentControlSet\Services\[service name]
+ *
+ *     \DisplayName
+ *     \ImagePath
+ *     \Parameters\ConfigArgs
+ */
+
+
+apr_status_t mpm_service_set_name(apr_pool_t *p, const char **display_name,
+                                  const char *set_name)
+{
+    char key_name[MAX_PATH];
+    ap_regkey_t *key;
+    apr_status_t rv;
+
+    /* ### Needs improvement, on Win2K the user can _easily_
+     * change the display name to a string that doesn't reflect
+     * the internal service name + whitespace!
+     */
+    mpm_service_name = apr_palloc(p, strlen(set_name) + 1);
+    apr_collapse_spaces((char*) mpm_service_name, set_name);
+#if APR_HAS_UNICODE_FS
+    IF_WIN_OS_IS_UNICODE
+    {
+        apr_size_t slen = strlen(mpm_service_name) + 1;
+        apr_size_t wslen = slen;
+        mpm_service_name_w = apr_palloc(p, wslen * sizeof(apr_wchar_t));
+        rv = apr_conv_utf8_to_ucs2(mpm_service_name, &slen,
+                                   mpm_service_name_w, &wslen);
+        if (rv != APR_SUCCESS)
+            return rv;
+        else if (slen)
+            return APR_ENAMETOOLONG;
+    }
+#endif /* APR_HAS_UNICODE_FS */
+
+    apr_snprintf(key_name, sizeof(key_name), SERVICECONFIG, mpm_service_name);
+    rv = ap_regkey_open(&key, AP_REGKEY_LOCAL_MACHINE, key_name,
+                        APR_READ, pconf);
+    if (rv == APR_SUCCESS) {
+        rv = ap_regkey_value_get(&mpm_display_name, key, "DisplayName", pconf);
+        ap_regkey_close(key);
+    }
+    if (rv != APR_SUCCESS) {
+        /* Take the given literal name if there is no service entry */
+        mpm_display_name = apr_pstrdup(p, set_name);
+    }
+    *display_name = mpm_display_name;
+
+    return rv;
+}
+
+
+apr_status_t mpm_merge_service_args(apr_pool_t *p,
+                                   apr_array_header_t *args,
+                                   int fixed_args)
+{
+    apr_array_header_t *svc_args = NULL;
+    char conf_key[MAX_PATH];
+    char **cmb_data;
+    apr_status_t rv;
+    ap_regkey_t *key;
+
+    apr_snprintf(conf_key, sizeof(conf_key), SERVICEPARAMS, mpm_service_name);
+    rv = ap_regkey_open(&key, AP_REGKEY_LOCAL_MACHINE, conf_key, APR_READ, p);
+    if (rv == APR_SUCCESS) {
+        rv = ap_regkey_value_array_get(&svc_args, key, "ConfigArgs", p);
+        ap_regkey_close(key);
+    }
+    if (rv != APR_SUCCESS) {
+        if (rv == ERROR_FILE_NOT_FOUND) {
+            ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00367)
+                         "No ConfigArgs registered for the '%s' service, "
+                         "perhaps this service is not installed?",
+                         mpm_service_name);
+            return APR_SUCCESS;
+        }
+        else
+            return (rv);
+    }
+
+    if (!svc_args || svc_args->nelts == 0) {
+        return (APR_SUCCESS);
+    }
+
+    /* Now we have the mpm_service_name arg, and the mpm_runservice_nt()
+     * call appended the arguments passed by StartService(), so it's
+     * time to _prepend_ the default arguments for the server from
+     * the service's default arguments (all others override them)...
+     */
+    args->nalloc = args->nelts + svc_args->nelts;
+    cmb_data = malloc(args->nalloc * sizeof(const char *));
+
+    /* First three args (argv[0], -f, path) remain first */
+    memcpy(cmb_data, args->elts, args->elt_size * fixed_args);
+
+    /* Service args follow from service registry array */
+    memcpy(cmb_data + fixed_args, svc_args->elts,
+           svc_args->elt_size * svc_args->nelts);
+
+    /* Remaining new args follow  */
+    memcpy(cmb_data + fixed_args + svc_args->nelts,
+           (const char **)args->elts + fixed_args,
+           args->elt_size * (args->nelts - fixed_args));
+
+    args->elts = (char *)cmb_data;
+    args->nelts = args->nalloc;
+
+    return APR_SUCCESS;
+}
+
+
+static void service_stopped(void)
+{
+    /* Still have a thread & window to clean up, so signal now */
+    if (globdat.service_thread)
+    {
+        /* Stop logging to the event log */
+        mpm_nt_eventlog_stderr_flush();
+
+        /* Cause the service_nt_main_fn to complete */
+        ReleaseMutex(globdat.service_term);
+
+        ReportStatusToSCMgr(SERVICE_STOPPED, 0, &globdat);
+
+        WaitForSingleObject(globdat.service_thread, 5000);
+        CloseHandle(globdat.service_thread);
+    }
+}
+
+
+apr_status_t mpm_service_to_start(const char **display_name, apr_pool_t *p)
+{
+    HANDLE hProc = GetCurrentProcess();
+    HANDLE hThread = GetCurrentThread();
+    HANDLE waitfor[2];
+
+    /* Prevent holding open the (hidden) console */
+    ap_real_exit_code = 0;
+
+     /* GetCurrentThread returns a psuedo-handle, we need
+      * a real handle for another thread to wait upon.
+      */
+    if (!DuplicateHandle(hProc, hThread, hProc, &(globdat.mpm_thread),
+                         0, FALSE, DUPLICATE_SAME_ACCESS)) {
+        return APR_ENOTHREAD;
+    }
+
+    globdat.service_init = CreateEvent(NULL, FALSE, FALSE, NULL);
+    globdat.service_term = CreateMutex(NULL, TRUE, NULL);
+    if (!globdat.service_init || !globdat.service_term) {
+         return APR_EGENERAL;
+    }
+
+    globdat.service_thread = CreateThread(NULL, 65536,
+                                          service_nt_dispatch_thread,
+                                          NULL, stack_res_flag,
+                                          &globdat.service_thread_id);
+
+    if (!globdat.service_thread) {
+        return APR_ENOTHREAD;
+    }
+
+    waitfor[0] = globdat.service_init;
+    waitfor[1] = globdat.service_thread;
+
+    /* Wait for controlling thread init or termination */
+    if (WaitForMultipleObjects(2, waitfor, FALSE, 10000) != WAIT_OBJECT_0) {
+        return APR_ENOTHREAD;
+    }
+
+    atexit(service_stopped);
+    *display_name = mpm_display_name;
+    return APR_SUCCESS;
+}
+
+
+apr_status_t mpm_service_started(void)
+{
+    set_service_description();
+    ReportStatusToSCMgr(SERVICE_RUNNING, 0, &globdat);
+    return APR_SUCCESS;
+}
+
+
+void mpm_service_stopping(void)
+{
+    ReportStatusToSCMgr(SERVICE_STOP_PENDING, 30000, &globdat);
+}
+
+
+apr_status_t mpm_service_install(apr_pool_t *ptemp, int argc,
+                                 const char * const * argv, int reconfig)
+{
+    char key_name[MAX_PATH];
+    char *launch_cmd;
+    ap_regkey_t *key;
+    apr_status_t rv;
+    SC_HANDLE   schService;
+    SC_HANDLE   schSCManager;
+    DWORD       rc;
+#if APR_HAS_UNICODE_FS
+    apr_wchar_t *display_name_w;
+    apr_wchar_t *launch_cmd_w;
+#endif
+
+    fprintf(stderr, reconfig ? "Reconfiguring the '%s' service\n"
+                             : "Installing the '%s' service\n",
+                    mpm_display_name);
+
+#if APR_HAS_UNICODE_FS
+    IF_WIN_OS_IS_UNICODE
+    {
+        apr_size_t slen = strlen(mpm_display_name) + 1;
+        apr_size_t wslen = slen;
+        display_name_w = apr_palloc(ptemp, wslen * sizeof(apr_wchar_t));
+        rv = apr_conv_utf8_to_ucs2(mpm_display_name, &slen,
+                                   display_name_w, &wslen);
+        if (rv != APR_SUCCESS)
+            return rv;
+        else if (slen)
+            return APR_ENAMETOOLONG;
+
+        launch_cmd_w = apr_palloc(ptemp, (MAX_PATH + 17) * sizeof(apr_wchar_t));
+        launch_cmd_w[0] = L'"';
+        rc = GetModuleFileNameW(NULL, launch_cmd_w + 1, MAX_PATH);
+        wcscpy(launch_cmd_w + rc + 1, L"\" -k runservice");
+    }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+    ELSE_WIN_OS_IS_ANSI
+    {
+        launch_cmd = apr_palloc(ptemp, MAX_PATH + 17);
+        launch_cmd[0] = '"';
+        rc = GetModuleFileName(NULL, launch_cmd + 1, MAX_PATH);
+        strcpy(launch_cmd + rc + 1, "\" -k runservice");
+    }
+#endif
+    if (rc == 0) {
+        rv = apr_get_os_error();
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                     APLOGNO(00368) "GetModuleFileName failed");
+        return rv;
+    }
+
+    schSCManager = OpenSCManager(NULL, NULL, /* local, default database */
+                                 SC_MANAGER_CREATE_SERVICE);
+    if (!schSCManager) {
+        rv = apr_get_os_error();
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                     APLOGNO(00369)  "Failed to open the Windows service "
+                     "manager, perhaps you forgot to log in as Adminstrator?");
+        return (rv);
+    }
+
+    if (reconfig) {
+#if APR_HAS_UNICODE_FS
+        IF_WIN_OS_IS_UNICODE
+        {
+            schService = OpenServiceW(schSCManager, mpm_service_name_w,
+                                      SERVICE_CHANGE_CONFIG);
+        }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+        ELSE_WIN_OS_IS_ANSI
+        {
+            schService = OpenService(schSCManager, mpm_service_name,
+                                     SERVICE_CHANGE_CONFIG);
+        }
+#endif
+        if (!schService) {
+            rv = apr_get_os_error();
+            CloseServiceHandle(schSCManager);
+            ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                         APLOGNO(00373) "Failed to open the '%s' service",
+                         mpm_display_name);
+            return (rv);
+        }
+
+#if APR_HAS_UNICODE_FS
+        IF_WIN_OS_IS_UNICODE
+        {
+            rc = ChangeServiceConfigW(schService,
+                                      SERVICE_WIN32_OWN_PROCESS,
+                                      SERVICE_AUTO_START,
+                                      SERVICE_ERROR_NORMAL,
+                                      launch_cmd_w, NULL, NULL,
+                                      L"Tcpip\0Afd\0", NULL, NULL,
+                                      display_name_w);
+        }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+        ELSE_WIN_OS_IS_ANSI
+        {
+            rc = ChangeServiceConfig(schService,
+                                     SERVICE_WIN32_OWN_PROCESS,
+                                     SERVICE_AUTO_START,
+                                     SERVICE_ERROR_NORMAL,
+                                     launch_cmd, NULL, NULL,
+                                     "Tcpip\0Afd\0", NULL, NULL,
+                                     mpm_display_name);
+        }
+#endif
+        if (!rc) {
+            ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP,
+                         apr_get_os_error(), NULL,
+                         APLOGNO(02652) "ChangeServiceConfig failed");
+
+            /* !schService aborts configuration below */
+            CloseServiceHandle(schService);
+            schService = NULL;
+        }
+    }
+    else {
+        /* RPCSS is the Remote Procedure Call (RPC) Locator required
+         * for DCOM communication pipes.  I am far from convinced we
+         * should add this to the default service dependencies, but
+         * be warned that future apache modules or ISAPI dll's may
+         * depend on it.
+         */
+#if APR_HAS_UNICODE_FS
+        IF_WIN_OS_IS_UNICODE
+        {
+            schService = CreateServiceW(schSCManager,    // SCManager database
+                                 mpm_service_name_w,   // name of service
+                                 display_name_w,   // name to display
+                                 SERVICE_ALL_ACCESS,   // access required
+                                 SERVICE_WIN32_OWN_PROCESS,  // service type
+                                 SERVICE_AUTO_START,   // start type
+                                 SERVICE_ERROR_NORMAL, // error control type
+                                 launch_cmd_w,         // service's binary
+                                 NULL,                 // no load svc group
+                                 NULL,                 // no tag identifier
+                                 L"Tcpip\0Afd\0",      // dependencies
+                                 NULL,                 // use SYSTEM account
+                                 NULL);                // no password
+        }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+        ELSE_WIN_OS_IS_ANSI
+        {
+            schService = CreateService(schSCManager,     // SCManager database
+                                 mpm_service_name,     // name of service
+                                 mpm_display_name,     // name to display
+                                 SERVICE_ALL_ACCESS,   // access required
+                                 SERVICE_WIN32_OWN_PROCESS,  // service type
+                                 SERVICE_AUTO_START,   // start type
+                                 SERVICE_ERROR_NORMAL, // error control type
+                                 launch_cmd,           // service's binary
+                                 NULL,                 // no load svc group
+                                 NULL,                 // no tag identifier
+                                 "Tcpip\0Afd\0",       // dependencies
+                                 NULL,                 // use SYSTEM account
+                                 NULL);                // no password
+        }
+#endif
+        if (!schService)
+        {
+            rv = apr_get_os_error();
+            ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                         APLOGNO(00370) "Failed to create the '%s' service",
+                         mpm_display_name);
+            CloseServiceHandle(schSCManager);
+            return (rv);
+        }
+    }
+
+    CloseServiceHandle(schService);
+    CloseServiceHandle(schSCManager);
+
+    set_service_description();
+
+    /* Store the service ConfigArgs in the registry...
+     */
+    apr_snprintf(key_name, sizeof(key_name), SERVICEPARAMS, mpm_service_name);
+    rv = ap_regkey_open(&key, AP_REGKEY_LOCAL_MACHINE, key_name,
+                        APR_READ | APR_WRITE | APR_CREATE, pconf);
+    if (rv == APR_SUCCESS) {
+        rv = ap_regkey_value_array_set(key, "ConfigArgs", argc, argv, pconf);
+        ap_regkey_close(key);
+    }
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                     APLOGNO(00371) "Failed to store ConfigArgs for the "
+                     "'%s' service in the registry.", mpm_display_name);
+        return (rv);
+    }
+    fprintf(stderr, "The '%s' service is successfully installed.\n",
+                    mpm_display_name);
+    return APR_SUCCESS;
+}
+
+
+apr_status_t mpm_service_uninstall(void)
+{
+    apr_status_t rv;
+    SC_HANDLE schService;
+    SC_HANDLE schSCManager;
+
+    fprintf(stderr, "Removing the '%s' service\n", mpm_display_name);
+
+    schSCManager = OpenSCManager(NULL, NULL, /* local, default database */
+                                 SC_MANAGER_CONNECT);
+    if (!schSCManager) {
+        rv = apr_get_os_error();
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                     APLOGNO(10009)  "Failed to open the Windows service "
+                     "manager, perhaps you forgot to log in as Adminstrator?");
+        return (rv);
+    }
+
+#if APR_HAS_UNICODE_FS
+    IF_WIN_OS_IS_UNICODE
+    {
+        schService = OpenServiceW(schSCManager, mpm_service_name_w, DELETE);
+    }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+    ELSE_WIN_OS_IS_ANSI
+    {
+        schService = OpenService(schSCManager, mpm_service_name, DELETE);
+    }
+#endif
+    if (!schService) {
+        rv = apr_get_os_error();
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                     APLOGNO(10010) "Failed to open the '%s' service",
+                     mpm_display_name);
+        return (rv);
+    }
+
+    /* assure the service is stopped before continuing
+     *
+     * This may be out of order... we might not be able to be
+     * granted all access if the service is running anyway.
+     *
+     * And do we want to make it *this easy* for them
+     * to uninstall their service unintentionally?
+     */
+    /* ap_stop_service(schService);
+     */
+
+    if (DeleteService(schService) == 0) {
+        rv = apr_get_os_error();
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                     APLOGNO(00374) "Failed to delete the '%s' service",
+                     mpm_display_name);
+        return (rv);
+    }
+
+    CloseServiceHandle(schService);
+    CloseServiceHandle(schSCManager);
+
+    fprintf(stderr, "The '%s' service has been removed successfully.\n",
+                    mpm_display_name);
+    return APR_SUCCESS;
+}
+
+
+/* signal_service_transition is a simple thunk to signal the service
+ * and monitor its successful transition.  If the signal passed is 0,
+ * then the caller is assumed to already have performed some service
+ * operation to be monitored (such as StartService), and no actual
+ * ControlService signal is sent.
+ */
+
+static int signal_service_transition(SC_HANDLE schService, DWORD signal,
+                                     DWORD pending, DWORD complete)
+{
+    if (signal && !ControlService(schService, signal, &globdat.ssStatus))
+        return FALSE;
+
+    do {
+        Sleep(1000);
+        if (!QueryServiceStatus(schService, &globdat.ssStatus))
+            return FALSE;
+    } while (globdat.ssStatus.dwCurrentState == pending);
+
+    return (globdat.ssStatus.dwCurrentState == complete);
+}
+
+
+apr_status_t mpm_service_start(apr_pool_t *ptemp, int argc,
+                               const char * const * argv)
+{
+    apr_status_t rv;
+    SC_HANDLE   schService;
+    SC_HANDLE   schSCManager;
+
+    fprintf(stderr, "Starting the '%s' service\n", mpm_display_name);
+
+    schSCManager = OpenSCManager(NULL, NULL, /* local, default database */
+                                 SC_MANAGER_CONNECT);
+    if (!schSCManager) {
+        rv = apr_get_os_error();
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL,
+                     APLOGNO(10011)  "Failed to open the Windows service "
+                     "manager, perhaps you forgot to log in as Adminstrator?");
+        return (rv);
+    }
+
+#if APR_HAS_UNICODE_FS
+    IF_WIN_OS_IS_UNICODE
+    {
+        schService = OpenServiceW(schSCManager, mpm_service_name_w,
+                                  SERVICE_START | SERVICE_QUERY_STATUS);
+    }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+    ELSE_WIN_OS_IS_ANSI
+    {
+        schService = OpenService(schSCManager, mpm_service_name,
+                                 SERVICE_START | SERVICE_QUERY_STATUS);
+    }
+#endif
+    if (!schService) {
+        rv = apr_get_os_error();
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, rv, NULL, 
+                     APLOGNO(10012) "Failed to open the '%s' service",
+                     mpm_display_name);
+        CloseServiceHandle(schSCManager);
+        return (rv);
+    }
+
+    if (QueryServiceStatus(schService, &globdat.ssStatus)
+        && (globdat.ssStatus.dwCurrentState == SERVICE_RUNNING)) {
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP, 0, NULL,
+                     APLOGNO(00377) "The '%s' service is already started!",
+                     mpm_display_name);
+        CloseServiceHandle(schService);
+        CloseServiceHandle(schSCManager);
+        return 0;
+    }
+
+    rv = APR_EINIT;
+#if APR_HAS_UNICODE_FS
+    IF_WIN_OS_IS_UNICODE
+    {
+        LPWSTR *start_argv_w = malloc((argc + 1) * sizeof(LPCWSTR));
+        int i;
+
+        for (i = 0; i < argc; ++i)
+        {
+            apr_size_t slen = strlen(argv[i]) + 1;
+            apr_size_t wslen = slen;
+            start_argv_w[i] = malloc(wslen * sizeof(WCHAR));
+            rv = apr_conv_utf8_to_ucs2(argv[i], &slen, start_argv_w[i], &wslen);
+            if (rv != APR_SUCCESS)
+                return rv;
+            else if (slen)
+                return APR_ENAMETOOLONG;
+        }
+        start_argv_w[argc] = NULL;
+
+        if (StartServiceW(schService, argc, start_argv_w)
+            && signal_service_transition(schService, 0, /* test only */
+                                         SERVICE_START_PENDING,
+                                         SERVICE_RUNNING))
+                rv = APR_SUCCESS;
+    }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+    ELSE_WIN_OS_IS_ANSI
+    {
+        char **start_argv = malloc((argc + 1) * sizeof(const char *));
+        memcpy(start_argv, argv, argc * sizeof(const char *));
+        start_argv[argc] = NULL;
+
+        if (StartService(schService, argc, start_argv)
+            && signal_service_transition(schService, 0, /* test only */
+                                         SERVICE_START_PENDING,
+                                         SERVICE_RUNNING))
+                rv = APR_SUCCESS;
+    }
+#endif
+    if (rv != APR_SUCCESS)
+        rv = apr_get_os_error();
+
+    CloseServiceHandle(schService);
+    CloseServiceHandle(schSCManager);
+
+    if (rv == APR_SUCCESS)
+        fprintf(stderr, "The '%s' service is running.\n", mpm_display_name);
+    else
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00378)
+                     "Failed to start the '%s' service",
+                     mpm_display_name);
+
+    return rv;
+}
+
+
+/* signal is zero to stop, non-zero for restart */
+
+void mpm_signal_service(apr_pool_t *ptemp, int signal)
+{
+    int success = FALSE;
+    SC_HANDLE   schService;
+    SC_HANDLE   schSCManager;
+
+    schSCManager = OpenSCManager(NULL, NULL, /* default machine & database */
+                                 SC_MANAGER_CONNECT);
+
+    if (!schSCManager) {
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP,
+                     apr_get_os_error(), NULL,
+                     APLOGNO(10013)  "Failed to open the Windows service "
+                     "manager, perhaps you forgot to log in as Adminstrator?");
+        return;
+    }
+
+#if APR_HAS_UNICODE_FS
+    IF_WIN_OS_IS_UNICODE
+    {
+        schService = OpenServiceW(schSCManager, mpm_service_name_w,
+                                  SERVICE_INTERROGATE | SERVICE_QUERY_STATUS |
+                                  SERVICE_USER_DEFINED_CONTROL |
+                                  SERVICE_START | SERVICE_STOP);
+    }
+#endif /* APR_HAS_UNICODE_FS */
+#if APR_HAS_ANSI_FS
+    ELSE_WIN_OS_IS_ANSI
+    {
+        schService = OpenService(schSCManager, mpm_service_name,
+                                 SERVICE_INTERROGATE | SERVICE_QUERY_STATUS |
+                                 SERVICE_USER_DEFINED_CONTROL |
+                                 SERVICE_START | SERVICE_STOP);
+    }
+#endif
+    if (schService == NULL) {
+        /* Could not open the service */
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP,
+                     apr_get_os_error(), NULL,
+                     APLOGNO(10014) "Failed to open the '%s' service",
+                     mpm_display_name);
+        CloseServiceHandle(schSCManager);
+        return;
+    }
+
+    if (!QueryServiceStatus(schService, &globdat.ssStatus)) {
+        ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_STARTUP,
+                     apr_get_os_error(), NULL,
+                     APLOGNO(00381) "Query of the '%s' service failed",
+                     mpm_display_name);
+        CloseServiceHandle(schService);
+        CloseServiceHandle(schSCManager);
+        return;
+    }
+
+    if (!signal && (globdat.ssStatus.dwCurrentState == SERVICE_STOPPED)) {
+        fprintf(stderr, "The '%s' service is not started.\n", mpm_display_name);
+        CloseServiceHandle(schService);
+        CloseServiceHandle(schSCManager);
+        return;
+    }
+
+    fprintf(stderr, signal ? "The '%s' service is restarting.\n"
+                           : "The '%s' service is stopping.\n",
+                    mpm_display_name);
+
+    if (!signal)
+        success = signal_service_transition(schService,
+                                            SERVICE_CONTROL_STOP,
+                                            SERVICE_STOP_PENDING,
+                                            SERVICE_STOPPED);
+    else if (globdat.ssStatus.dwCurrentState == SERVICE_STOPPED) {
+        mpm_service_start(ptemp, 0, NULL);
+        CloseServiceHandle(schService);
+        CloseServiceHandle(schSCManager);
+        return;
+    }
+    else
+        success = signal_service_transition(schService,
+                                            SERVICE_APACHE_RESTART,
+                                            SERVICE_START_PENDING,
+                                            SERVICE_RUNNING);
+
+    CloseServiceHandle(schService);
+    CloseServiceHandle(schSCManager);
+
+    if (success)
+        fprintf(stderr, signal ? "The '%s' service has restarted.\n"
+                               : "The '%s' service has stopped.\n",
+                        mpm_display_name);
+    else
+        fprintf(stderr, signal ? "Failed to restart the '%s' service.\n"
+                               : "Failed to stop the '%s' service.\n",
+                        mpm_display_name);
+}
diff --git a/server/mpm/worker/Makefile.in b/server/mpm/worker/Makefile.in
new file mode 100644
index 0000000..e32210f
--- /dev/null
+++ b/server/mpm/worker/Makefile.in
@@ -0,0 +1,2 @@
+
+include $(top_srcdir)/build/special.mk
diff --git a/server/mpm/worker/config.m4 b/server/mpm/worker/config.m4
new file mode 100644
index 0000000..1a50026
--- /dev/null
+++ b/server/mpm/worker/config.m4
@@ -0,0 +1,11 @@
+AC_MSG_CHECKING(if worker MPM supports this platform)
+if test $forking_mpms_supported != yes; then
+    AC_MSG_RESULT(no - This is not a forking platform)
+elif test $ac_cv_define_APR_HAS_THREADS != yes; then
+    AC_MSG_RESULT(no - APR does not support threads)
+elif test $have_threaded_sig_graceful != yes; then
+    AC_MSG_RESULT(no - SIG_GRACEFUL cannot be used with a threaded MPM)
+else
+    AC_MSG_RESULT(yes)
+    APACHE_MPM_SUPPORTED(worker, yes, yes)
+fi
diff --git a/server/mpm/worker/config3.m4 b/server/mpm/worker/config3.m4
new file mode 100644
index 0000000..6c1eb17
--- /dev/null
+++ b/server/mpm/worker/config3.m4
@@ -0,0 +1,5 @@
+dnl ## XXX - Need a more thorough check of the proper flags to use
+
+APACHE_MPM_MODULE(worker, $enable_mpm_worker, worker.lo,[
+    AC_CHECK_FUNCS(pthread_kill)
+])
diff --git a/server/mpm/worker/mpm_default.h b/server/mpm/worker/mpm_default.h
new file mode 100644
index 0000000..464250e
--- /dev/null
+++ b/server/mpm/worker/mpm_default.h
@@ -0,0 +1,55 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file  worker/mpm_default.h
+ * @brief Worker MPM defaults
+ *
+ * @defgroup APACHE_MPM_WORKER Worker MPM
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Number of servers to spawn off by default --- also, if fewer than
+ * this free when the caretaker checks, it will spawn more.
+ */
+#ifndef DEFAULT_START_DAEMON
+#define DEFAULT_START_DAEMON 3
+#endif
+
+/* Maximum number of *free* server processes --- more than this, and
+ * they will die off.
+ */
+
+#ifndef DEFAULT_MAX_FREE_DAEMON
+#define DEFAULT_MAX_FREE_DAEMON 10
+#endif
+
+/* Minimum --- fewer than this, and more will be created */
+
+#ifndef DEFAULT_MIN_FREE_DAEMON
+#define DEFAULT_MIN_FREE_DAEMON 3
+#endif
+
+#ifndef DEFAULT_THREADS_PER_CHILD
+#define DEFAULT_THREADS_PER_CHILD 25
+#endif
+
+#endif /* AP_MPM_DEFAULT_H */
+/** @} */
diff --git a/server/mpm/worker/worker.c b/server/mpm/worker/worker.c
new file mode 100644
index 0000000..8012fe2
--- /dev/null
+++ b/server/mpm/worker/worker.c
@@ -0,0 +1,2406 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* The purpose of this MPM is to fix the design flaws in the threaded
+ * model.  Because of the way that pthreads and mutex locks interact,
+ * it is basically impossible to cleanly gracefully shutdown a child
+ * process if multiple threads are all blocked in accept.  This model
+ * fixes those problems.
+ */
+
+#include "apr.h"
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_file_io.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+#include "apr_thread_mutex.h"
+#include "apr_proc_mutex.h"
+#include "apr_poll.h"
+
+#include <stdlib.h>
+
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#if APR_HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+#ifdef HAVE_SYS_PROCESSOR_H
+#include <sys/processor.h> /* for bindprocessor() */
+#endif
+
+#if !APR_HAS_THREADS
+#error The Worker MPM requires APR threads, but they are unavailable.
+#endif
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h"        /* for read_config */
+#include "http_core.h"          /* for get_remote_host */
+#include "http_connection.h"
+#include "ap_mpm.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "scoreboard.h"
+#include "mpm_fdqueue.h"
+#include "mpm_default.h"
+#include "util_mutex.h"
+#include "unixd.h"
+
+#include <signal.h>
+#include <limits.h>             /* for INT_MAX */
+
+/* Limit on the total --- clients will be locked out if more servers than
+ * this are needed.  It is intended solely to keep the server from crashing
+ * when things get out of hand.
+ *
+ * We keep a hard maximum number of servers, for two reasons --- first off,
+ * in case something goes seriously wrong, we want to stop the fork bomb
+ * short of actually crashing the machine we're running on by filling some
+ * kernel table.  Secondly, it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_SERVER_LIMIT
+#define DEFAULT_SERVER_LIMIT 16
+#endif
+
+/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT.  We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_SERVER_LIMIT
+#define MAX_SERVER_LIMIT 20000
+#endif
+
+/* Limit on the threads per process.  Clients will be locked out if more than
+ * this  * server_limit are needed.
+ *
+ * We keep this for one reason it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_THREAD_LIMIT
+#define DEFAULT_THREAD_LIMIT 64
+#endif
+
+/* Admin can't tune ThreadLimit beyond MAX_THREAD_LIMIT.  We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_THREAD_LIMIT
+#define MAX_THREAD_LIMIT 20000
+#endif
+
+/*
+ * Actual definitions of config globals
+ */
+
+static int threads_per_child = 0;     /* Worker threads per child */
+static int ap_daemons_to_start = 0;
+static int min_spare_threads = 0;
+static int max_spare_threads = 0;
+static int ap_daemons_limit = 0;
+static int max_workers = 0;
+static int server_limit = 0;
+static int thread_limit = 0;
+static int had_healthy_child = 0;
+static int dying = 0;
+static int workers_may_exit = 0;
+static int start_thread_may_exit = 0;
+static int listener_may_exit = 0;
+static int requests_this_child;
+static int num_listensocks = 0;
+static int resource_shortage = 0;
+static fd_queue_t *worker_queue;
+static fd_queue_info_t *worker_queue_info;
+static apr_pollset_t *worker_pollset;
+
+
+/* data retained by worker across load/unload of the module
+ * allocated on first call to pre-config hook; located on
+ * subsequent calls to pre-config hook
+ */
+typedef struct worker_retained_data {
+    ap_unixd_mpm_retained_data *mpm;
+
+    int first_server_limit;
+    int first_thread_limit;
+    int sick_child_detected;
+    int maxclients_reported;
+    int near_maxclients_reported;
+    /*
+     * The max child slot ever assigned, preserved across restarts.  Necessary
+     * to deal with MaxRequestWorkers changes across AP_SIG_GRACEFUL restarts.
+     * We use this value to optimize routines that have to scan the entire
+     * scoreboard.
+     */
+    int max_daemons_limit;
+    /*
+     * idle_spawn_rate is the number of children that will be spawned on the
+     * next maintenance cycle if there aren't enough idle servers.  It is
+     * maintained per listeners bucket, doubled up to MAX_SPAWN_RATE, and
+     * reset only when a cycle goes by without the need to spawn.
+     */
+    int *idle_spawn_rate;
+#ifndef MAX_SPAWN_RATE
+#define MAX_SPAWN_RATE        (32)
+#endif
+    int hold_off_on_exponential_spawning;
+} worker_retained_data;
+static worker_retained_data *retained;
+
+typedef struct worker_child_bucket {
+    ap_pod_t *pod;
+    ap_listen_rec *listeners;
+    apr_proc_mutex_t *mutex;
+} worker_child_bucket;
+static worker_child_bucket *all_buckets, /* All listeners buckets */
+                           *my_bucket;   /* Current child bucket */
+
+#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
+
+/* The structure used to pass unique initialization info to each thread */
+typedef struct {
+    int pid;
+    int tid;
+    int sd;
+} proc_info;
+
+/* Structure used to pass information to the thread responsible for
+ * creating the rest of the threads.
+ */
+typedef struct {
+    apr_thread_t **threads;
+    apr_thread_t *listener;
+    int child_num_arg;
+    apr_threadattr_t *threadattr;
+} thread_starter;
+
+#define ID_FROM_CHILD_THREAD(c, t)    ((c * thread_limit) + t)
+
+/* The worker MPM respects a couple of runtime flags that can aid
+ * in debugging. Setting the -DNO_DETACH flag will prevent the root process
+ * from detaching from its controlling terminal. Additionally, setting
+ * the -DONE_PROCESS flag (which implies -DNO_DETACH) will get you the
+ * child_main loop running in the process which originally started up.
+ * This gives you a pretty nice debugging environment.  (You'll get a SIGHUP
+ * early in standalone_main; just continue through.  This is the server
+ * trying to kill off any child processes which it might have lying
+ * around --- Apache doesn't keep track of their pids, it just sends
+ * SIGHUP to the process group, ignoring it in the root process.
+ * Continue through and you'll be fine.).
+ */
+
+static int one_process = 0;
+
+#ifdef DEBUG_SIGSTOP
+int raise_sigstop_flags;
+#endif
+
+static apr_pool_t *pconf;                 /* Pool for config stuff */
+static apr_pool_t *pchild;                /* Pool for httpd child stuff */
+static apr_pool_t *pruntime;              /* Pool for MPM threads stuff */
+
+static pid_t ap_my_pid; /* Linux getpid() doesn't work except in main
+                           thread. Use this instead */
+static pid_t parent_pid;
+static apr_os_thread_t *listener_os_thread;
+
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+#define SAFE_ACCEPT(stmt) (ap_listeners->next ? (stmt) : APR_SUCCESS)
+#else
+#define SAFE_ACCEPT(stmt) (stmt)
+#endif
+
+/* The LISTENER_SIGNAL signal will be sent from the main thread to the
+ * listener thread to wake it up for graceful termination (what a child
+ * process from an old generation does when the admin does "apachectl
+ * graceful").  This signal will be blocked in all threads of a child
+ * process except for the listener thread.
+ */
+#define LISTENER_SIGNAL     SIGHUP
+
+/* The WORKER_SIGNAL signal will be sent from the main thread to the
+ * worker threads during an ungraceful restart or shutdown.
+ * This ensures that on systems (i.e., Linux) where closing the worker
+ * socket doesn't awake the worker thread when it is polling on the socket
+ * (especially in apr_wait_for_io_or_timeout() when handling
+ * Keep-Alive connections), close_worker_sockets() and join_workers()
+ * still function in timely manner and allow ungraceful shutdowns to
+ * proceed to completion.  Otherwise join_workers() doesn't return
+ * before the main process decides the child process is non-responsive
+ * and sends a SIGKILL.
+ */
+#define WORKER_SIGNAL       AP_SIG_GRACEFUL
+
+/* An array of socket descriptors in use by each thread used to
+ * perform a non-graceful (forced) shutdown of the server. */
+static apr_socket_t **worker_sockets;
+
+static void close_worker_sockets(void)
+{
+    int i;
+    for (i = 0; i < threads_per_child; i++) {
+        if (worker_sockets[i]) {
+            apr_socket_close(worker_sockets[i]);
+            worker_sockets[i] = NULL;
+        }
+    }
+}
+
+static void wakeup_listener(void)
+{
+    listener_may_exit = 1;
+    if (!listener_os_thread) {
+        /* XXX there is an obscure path that this doesn't handle perfectly:
+         *     right after listener thread is created but before
+         *     listener_os_thread is set, the first worker thread hits an
+         *     error and starts graceful termination
+         */
+        return;
+    }
+
+    /* unblock the listener if it's waiting for a worker */
+    ap_queue_info_term(worker_queue_info);
+
+    /*
+     * we should just be able to "kill(ap_my_pid, LISTENER_SIGNAL)" on all
+     * platforms and wake up the listener thread since it is the only thread
+     * with SIGHUP unblocked, but that doesn't work on Linux
+     */
+#ifdef HAVE_PTHREAD_KILL
+    pthread_kill(*listener_os_thread, LISTENER_SIGNAL);
+#else
+    kill(ap_my_pid, LISTENER_SIGNAL);
+#endif
+}
+
+#define ST_INIT              0
+#define ST_GRACEFUL          1
+#define ST_UNGRACEFUL        2
+
+static int terminate_mode = ST_INIT;
+
+static void signal_threads(int mode)
+{
+    if (terminate_mode == mode) {
+        return;
+    }
+    terminate_mode = mode;
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+
+    /* in case we weren't called from the listener thread, wake up the
+     * listener thread
+     */
+    wakeup_listener();
+
+    /* for ungraceful termination, let the workers exit now;
+     * for graceful termination, the listener thread will notify the
+     * workers to exit once it has stopped accepting new connections
+     */
+    if (mode == ST_UNGRACEFUL) {
+        workers_may_exit = 1;
+        ap_queue_interrupt_all(worker_queue);
+        close_worker_sockets(); /* forcefully kill all current connections */
+    }
+}
+
+static int worker_query(int query_code, int *result, apr_status_t *rv)
+{
+    *rv = APR_SUCCESS;
+    switch (query_code) {
+        case AP_MPMQ_MAX_DAEMON_USED:
+            *result = retained->max_daemons_limit;
+            break;
+        case AP_MPMQ_IS_THREADED:
+            *result = AP_MPMQ_STATIC;
+            break;
+        case AP_MPMQ_IS_FORKED:
+            *result = AP_MPMQ_DYNAMIC;
+            break;
+        case AP_MPMQ_HARD_LIMIT_DAEMONS:
+            *result = server_limit;
+            break;
+        case AP_MPMQ_HARD_LIMIT_THREADS:
+            *result = thread_limit;
+            break;
+        case AP_MPMQ_MAX_THREADS:
+            *result = threads_per_child;
+            break;
+        case AP_MPMQ_MIN_SPARE_DAEMONS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MIN_SPARE_THREADS:
+            *result = min_spare_threads;
+            break;
+        case AP_MPMQ_MAX_SPARE_DAEMONS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MAX_SPARE_THREADS:
+            *result = max_spare_threads;
+            break;
+        case AP_MPMQ_MAX_REQUESTS_DAEMON:
+            *result = ap_max_requests_per_child;
+            break;
+        case AP_MPMQ_MAX_DAEMONS:
+            *result = ap_daemons_limit;
+            break;
+        case AP_MPMQ_MPM_STATE:
+            *result = retained->mpm->mpm_state;
+            break;
+        case AP_MPMQ_GENERATION:
+            *result = retained->mpm->my_generation;
+            break;
+        default:
+            *rv = APR_ENOTIMPL;
+            break;
+    }
+    return OK;
+}
+
+static void worker_note_child_killed(int childnum, pid_t pid, ap_generation_t gen)
+{
+    if (childnum != -1) { /* child had a scoreboard slot? */
+        ap_run_child_status(ap_server_conf,
+                            ap_scoreboard_image->parent[childnum].pid,
+                            ap_scoreboard_image->parent[childnum].generation,
+                            childnum, MPM_CHILD_EXITED);
+        ap_scoreboard_image->parent[childnum].pid = 0;
+    }
+    else {
+        ap_run_child_status(ap_server_conf, pid, gen, -1, MPM_CHILD_EXITED);
+    }
+}
+
+static void worker_note_child_started(int slot, pid_t pid)
+{
+    ap_generation_t gen = retained->mpm->my_generation;
+    ap_scoreboard_image->parent[slot].pid = pid;
+    ap_scoreboard_image->parent[slot].generation = gen;
+    ap_run_child_status(ap_server_conf, pid, gen, slot, MPM_CHILD_STARTED);
+}
+
+static void worker_note_child_lost_slot(int slot, pid_t newpid)
+{
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00263)
+                 "pid %" APR_PID_T_FMT " taking over scoreboard slot from "
+                 "%" APR_PID_T_FMT "%s",
+                 newpid,
+                 ap_scoreboard_image->parent[slot].pid,
+                 ap_scoreboard_image->parent[slot].quiescing ?
+                 " (quiescing)" : "");
+    ap_run_child_status(ap_server_conf,
+                        ap_scoreboard_image->parent[slot].pid,
+                        ap_scoreboard_image->parent[slot].generation,
+                        slot, MPM_CHILD_LOST_SLOT);
+    /* Don't forget about this exiting child process, or we
+     * won't be able to kill it if it doesn't exit by the
+     * time the server is shut down.
+     */
+    ap_register_extra_mpm_process(ap_scoreboard_image->parent[slot].pid,
+                                  ap_scoreboard_image->parent[slot].generation);
+}
+
+static const char *worker_get_name(void)
+{
+    return "worker";
+}
+
+/* a clean exit from a child with proper cleanup */
+static void clean_child_exit(int code) __attribute__ ((noreturn));
+static void clean_child_exit(int code)
+{
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+    if (pchild) {
+        apr_pool_destroy(pchild);
+    }
+
+    if (one_process) {
+        worker_note_child_killed(/* slot */ 0, 0, 0);
+    }
+
+    exit(code);
+}
+
+static void just_die(int sig)
+{
+    clean_child_exit(0);
+}
+
+/*****************************************************************
+ * Connection structures and accounting...
+ */
+
+static int child_fatal;
+
+/*****************************************************************
+ * Here follows a long bunch of generic server bookkeeping stuff...
+ */
+
+/*****************************************************************
+ * Child process main loop.
+ */
+
+static void process_socket(apr_thread_t *thd, apr_pool_t *p, apr_socket_t *sock,
+                           int my_child_num,
+                           int my_thread_num, apr_bucket_alloc_t *bucket_alloc)
+{
+    conn_rec *current_conn;
+    long conn_id = ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);
+    ap_sb_handle_t *sbh;
+
+    ap_create_sb_handle(&sbh, p, my_child_num, my_thread_num);
+
+    current_conn = ap_run_create_connection(p, ap_server_conf, sock,
+                                            conn_id, sbh, bucket_alloc);
+    if (current_conn) {
+        current_conn->current_thread = thd;
+        ap_process_connection(current_conn, sock);
+        ap_lingering_close(current_conn);
+    }
+}
+
+/* requests_this_child has gone to zero or below.  See if the admin coded
+   "MaxConnectionsPerChild 0", and keep going in that case.  Doing it this way
+   simplifies the hot path in worker_thread */
+static void check_infinite_requests(void)
+{
+    if (ap_max_requests_per_child) {
+        signal_threads(ST_GRACEFUL);
+    }
+    else {
+        requests_this_child = INT_MAX;      /* keep going */
+    }
+}
+
+static void unblock_signal(int sig)
+{
+    sigset_t sig_mask;
+
+    sigemptyset(&sig_mask);
+    sigaddset(&sig_mask, sig);
+#if defined(SIGPROCMASK_SETS_THREAD_MASK)
+    sigprocmask(SIG_UNBLOCK, &sig_mask, NULL);
+#else
+    pthread_sigmask(SIG_UNBLOCK, &sig_mask, NULL);
+#endif
+}
+
+static void dummy_signal_handler(int sig)
+{
+    /* XXX If specifying SIG_IGN is guaranteed to unblock a syscall,
+     *     then we don't need this goofy function.
+     */
+}
+
+static void accept_mutex_error(const char *func, apr_status_t rv, int process_slot)
+{
+    int level = APLOG_EMERG;
+
+    if (ap_scoreboard_image->parent[process_slot].generation !=
+        ap_scoreboard_image->global->running_generation) {
+        level = APLOG_DEBUG; /* common to get these at restart time */
+    }
+    else if (requests_this_child == INT_MAX
+        || ((requests_this_child == ap_max_requests_per_child)
+            && ap_max_requests_per_child)) {
+        ap_log_error(APLOG_MARK, level, rv, ap_server_conf, APLOGNO(00272)
+                     "apr_proc_mutex_%s failed "
+                     "before this child process served any requests.",
+                     func);
+        clean_child_exit(APEXIT_CHILDSICK);
+    }
+    ap_log_error(APLOG_MARK, level, rv, ap_server_conf, APLOGNO(00273)
+                 "apr_proc_mutex_%s failed. Attempting to "
+                 "shutdown process gracefully.", func);
+    signal_threads(ST_GRACEFUL);
+}
+
+static void * APR_THREAD_FUNC listener_thread(apr_thread_t *thd, void * dummy)
+{
+    proc_info * ti = dummy;
+    int process_slot = ti->pid;
+    void *csd = NULL;
+    apr_pool_t *ptrans = NULL;            /* Pool for per-transaction stuff */
+    apr_status_t rv;
+    ap_listen_rec *lr = NULL;
+    int have_idle_worker = 0;
+    int last_poll_idx = 0;
+
+    free(ti);
+
+    /* Unblock the signal used to wake this thread up, and set a handler for
+     * it.
+     */
+    unblock_signal(LISTENER_SIGNAL);
+    apr_signal(LISTENER_SIGNAL, dummy_signal_handler);
+
+    /* TODO: Switch to a system where threads reuse the results from earlier
+       poll calls - manoj */
+    while (1) {
+        /* TODO: requests_this_child should be synchronized - aaron */
+        if (requests_this_child <= 0) {
+            check_infinite_requests();
+        }
+        if (listener_may_exit) break;
+
+        if (!have_idle_worker) {
+            rv = ap_queue_info_wait_for_idler(worker_queue_info, NULL);
+            if (APR_STATUS_IS_EOF(rv)) {
+                break; /* we've been signaled to die now */
+            }
+            else if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+                             "apr_queue_info_wait failed. Attempting to "
+                             " shutdown process gracefully.");
+                signal_threads(ST_GRACEFUL);
+                break;
+            }
+            have_idle_worker = 1;
+        }
+
+        /* We've already decremented the idle worker count inside
+         * ap_queue_info_wait_for_idler. */
+
+        if ((rv = SAFE_ACCEPT(apr_proc_mutex_lock(my_bucket->mutex)))
+            != APR_SUCCESS) {
+
+            if (!listener_may_exit) {
+                accept_mutex_error("lock", rv, process_slot);
+            }
+            break;                    /* skip the lock release */
+        }
+
+        if (!my_bucket->listeners->next) {
+            /* Only one listener, so skip the poll */
+            lr = my_bucket->listeners;
+        }
+        else {
+            while (!listener_may_exit) {
+                apr_int32_t numdesc;
+                const apr_pollfd_t *pdesc;
+
+                rv = apr_pollset_poll(worker_pollset, -1, &numdesc, &pdesc);
+                if (rv != APR_SUCCESS) {
+                    if (APR_STATUS_IS_EINTR(rv)) {
+                        continue;
+                    }
+
+                    /* apr_pollset_poll() will only return errors in catastrophic
+                     * circumstances. Let's try exiting gracefully, for now. */
+                    ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(03137)
+                                 "apr_pollset_poll: (listen)");
+                    signal_threads(ST_GRACEFUL);
+                }
+
+                if (listener_may_exit) break;
+
+                /* We can always use pdesc[0], but sockets at position N
+                 * could end up completely starved of attention in a very
+                 * busy server. Therefore, we round-robin across the
+                 * returned set of descriptors. While it is possible that
+                 * the returned set of descriptors might flip around and
+                 * continue to starve some sockets, we happen to know the
+                 * internal pollset implementation retains ordering
+                 * stability of the sockets. Thus, the round-robin should
+                 * ensure that a socket will eventually be serviced.
+                 */
+                if (last_poll_idx >= numdesc)
+                    last_poll_idx = 0;
+
+                /* Grab a listener record from the client_data of the poll
+                 * descriptor, and advance our saved index to round-robin
+                 * the next fetch.
+                 *
+                 * ### hmm... this descriptor might have POLLERR rather
+                 * ### than POLLIN
+                 */
+                lr = pdesc[last_poll_idx++].client_data;
+                break;
+
+            } /* while */
+
+        } /* if/else */
+
+        if (!listener_may_exit) {
+            /* the following pops a recycled ptrans pool off a stack */
+            ap_queue_info_pop_pool(worker_queue_info, &ptrans);
+            if (ptrans == NULL) {
+                /* we can't use a recycled transaction pool this time.
+                 * create a new transaction pool */
+                apr_allocator_t *allocator;
+
+                apr_allocator_create(&allocator);
+                apr_allocator_max_free_set(allocator, ap_max_mem_free);
+                apr_pool_create_ex(&ptrans, pconf, NULL, allocator);
+                apr_allocator_owner_set(allocator, ptrans);
+                apr_pool_tag(ptrans, "transaction");
+            }
+            rv = lr->accept_func(&csd, lr, ptrans);
+            /* later we trash rv and rely on csd to indicate success/failure */
+            AP_DEBUG_ASSERT(rv == APR_SUCCESS || !csd);
+
+            if (rv == APR_EGENERAL) {
+                /* E[NM]FILE, ENOMEM, etc */
+                resource_shortage = 1;
+                signal_threads(ST_GRACEFUL);
+            }
+            if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(my_bucket->mutex)))
+                != APR_SUCCESS) {
+
+                if (listener_may_exit) {
+                    break;
+                }
+                accept_mutex_error("unlock", rv, process_slot);
+            }
+            if (csd != NULL) {
+                rv = ap_queue_push_socket(worker_queue, csd, NULL, ptrans);
+                if (rv) {
+                    /* trash the connection; we couldn't queue the connected
+                     * socket to a worker
+                     */
+                    apr_socket_close(csd);
+                    ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(03138)
+                                 "ap_queue_push_socket failed");
+                }
+                else {
+                    have_idle_worker = 0;
+                }
+            }
+        }
+        else {
+            if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(my_bucket->mutex)))
+                != APR_SUCCESS) {
+                int level = APLOG_EMERG;
+
+                if (ap_scoreboard_image->parent[process_slot].generation !=
+                    ap_scoreboard_image->global->running_generation) {
+                    level = APLOG_DEBUG; /* common to get these at restart time */
+                }
+                ap_log_error(APLOG_MARK, level, rv, ap_server_conf, APLOGNO(00274)
+                             "apr_proc_mutex_unlock failed. Attempting to "
+                             "shutdown process gracefully.");
+                signal_threads(ST_GRACEFUL);
+            }
+            break;
+        }
+    }
+
+    ap_close_listeners_ex(my_bucket->listeners);
+    ap_queue_info_free_idle_pools(worker_queue_info);
+    ap_queue_term(worker_queue);
+    dying = 1;
+    ap_scoreboard_image->parent[process_slot].quiescing = 1;
+
+    /* wake up the main thread */
+    kill(ap_my_pid, SIGTERM);
+
+    apr_thread_exit(thd, APR_SUCCESS);
+    return NULL;
+}
+
+/* XXX For ungraceful termination/restart, we definitely don't want to
+ *     wait for active connections to finish but we may want to wait
+ *     for idle workers to get out of the queue code and release mutexes,
+ *     since those mutexes are cleaned up pretty soon and some systems
+ *     may not react favorably (i.e., segfault) if operations are attempted
+ *     on cleaned-up mutexes.
+ */
+static void * APR_THREAD_FUNC worker_thread(apr_thread_t *thd, void * dummy)
+{
+    proc_info * ti = dummy;
+    int process_slot = ti->pid;
+    int thread_slot = ti->tid;
+    apr_socket_t *csd = NULL;
+    apr_bucket_alloc_t *bucket_alloc;
+    apr_pool_t *last_ptrans = NULL;
+    apr_pool_t *ptrans;                /* Pool for per-transaction stuff */
+    apr_status_t rv;
+    int is_idle = 0;
+
+    free(ti);
+
+    ap_scoreboard_image->servers[process_slot][thread_slot].pid = ap_my_pid;
+    ap_scoreboard_image->servers[process_slot][thread_slot].tid = apr_os_thread_current();
+    ap_scoreboard_image->servers[process_slot][thread_slot].generation = retained->mpm->my_generation;
+    ap_update_child_status_from_indexes(process_slot, thread_slot,
+                                        SERVER_STARTING, NULL);
+
+#ifdef HAVE_PTHREAD_KILL
+    unblock_signal(WORKER_SIGNAL);
+    apr_signal(WORKER_SIGNAL, dummy_signal_handler);
+#endif
+
+    while (!workers_may_exit) {
+        if (!is_idle) {
+            rv = ap_queue_info_set_idle(worker_queue_info, last_ptrans);
+            last_ptrans = NULL;
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+                             "ap_queue_info_set_idle failed. Attempting to "
+                             "shutdown process gracefully.");
+                signal_threads(ST_GRACEFUL);
+                break;
+            }
+            is_idle = 1;
+        }
+
+        ap_update_child_status_from_indexes(process_slot, thread_slot,
+                                            SERVER_READY, NULL);
+worker_pop:
+        if (workers_may_exit) {
+            break;
+        }
+        rv = ap_queue_pop_socket(worker_queue, &csd, &ptrans);
+
+        if (rv != APR_SUCCESS) {
+            /* We get APR_EOF during a graceful shutdown once all the connections
+             * accepted by this server process have been handled.
+             */
+            if (APR_STATUS_IS_EOF(rv)) {
+                break;
+            }
+            /* We get APR_EINTR whenever ap_queue_pop_*() has been interrupted
+             * from an explicit call to ap_queue_interrupt_all(). This allows
+             * us to unblock threads stuck in ap_queue_pop_*() when a shutdown
+             * is pending.
+             *
+             * If workers_may_exit is set and this is ungraceful termination/
+             * restart, we are bound to get an error on some systems (e.g.,
+             * AIX, which sanity-checks mutex operations) since the queue
+             * may have already been cleaned up.  Don't log the "error" if
+             * workers_may_exit is set.
+             */
+            else if (APR_STATUS_IS_EINTR(rv)) {
+                goto worker_pop;
+            }
+            /* We got some other error. */
+            else if (!workers_may_exit) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(03139)
+                             "ap_queue_pop_socket failed");
+            }
+            continue;
+        }
+        is_idle = 0;
+        worker_sockets[thread_slot] = csd;
+        bucket_alloc = apr_bucket_alloc_create(ptrans);
+        process_socket(thd, ptrans, csd, process_slot, thread_slot, bucket_alloc);
+        worker_sockets[thread_slot] = NULL;
+        requests_this_child--;
+        apr_pool_clear(ptrans);
+        last_ptrans = ptrans;
+    }
+
+    ap_update_child_status_from_indexes(process_slot, thread_slot,
+                                        dying ? SERVER_DEAD
+                                              : SERVER_GRACEFUL, NULL);
+
+    apr_thread_exit(thd, APR_SUCCESS);
+    return NULL;
+}
+
+static int check_signal(int signum)
+{
+    switch (signum) {
+    case SIGTERM:
+    case SIGINT:
+        return 1;
+    }
+    return 0;
+}
+
+static void create_listener_thread(thread_starter *ts)
+{
+    int my_child_num = ts->child_num_arg;
+    apr_threadattr_t *thread_attr = ts->threadattr;
+    proc_info *my_info;
+    apr_status_t rv;
+
+    my_info = (proc_info *)ap_malloc(sizeof(proc_info));
+    my_info->pid = my_child_num;
+    my_info->tid = -1; /* listener thread doesn't have a thread slot */
+    my_info->sd = 0;
+    rv = apr_thread_create(&ts->listener, thread_attr, listener_thread,
+                           my_info, pruntime);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00275)
+                     "apr_thread_create: unable to create listener thread");
+        /* let the parent decide how bad this really is */
+        clean_child_exit(APEXIT_CHILDSICK);
+    }
+    apr_os_thread_get(&listener_os_thread, ts->listener);
+}
+
+static void setup_threads_runtime(void)
+{
+    ap_listen_rec *lr;
+    apr_status_t rv;
+
+    /* All threads (listener, workers) and synchronization objects (queues,
+     * pollset, mutexes...) created here should have at least the lifetime of
+     * the connections they handle (i.e. ptrans). We can't use this thread's
+     * self pool because all these objects survive it, nor use pchild or pconf
+     * directly because this starter thread races with other modules' runtime,
+     * nor finally pchild (or subpool thereof) because it is killed explicitely
+     * before pconf (thus connections/ptrans can live longer, which matters in
+     * ONE_PROCESS mode). So this leaves us with a subpool of pconf, created
+     * before any ptrans hence destroyed after.
+     */
+    apr_pool_create(&pruntime, pconf);
+    apr_pool_tag(pruntime, "mpm_runtime");
+
+    /* We must create the fd queues before we start up the listener
+     * and worker threads. */
+    rv = ap_queue_create(&worker_queue, threads_per_child, pruntime);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(03140)
+                     "ap_queue_create() failed");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    rv = ap_queue_info_create(&worker_queue_info, pruntime,
+                              threads_per_child, -1);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(03141)
+                     "ap_queue_info_create() failed");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Create the main pollset */
+    rv = apr_pollset_create(&worker_pollset, num_listensocks, pruntime,
+                            APR_POLLSET_NOCOPY);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(03285)
+                     "Couldn't create pollset in thread;"
+                     " check system or user limits");
+        /* let the parent decide how bad this really is */
+        clean_child_exit(APEXIT_CHILDSICK);
+    }
+
+    for (lr = my_bucket->listeners; lr != NULL; lr = lr->next) {
+        apr_pollfd_t *pfd = apr_pcalloc(pruntime, sizeof *pfd);
+
+        pfd->desc_type = APR_POLL_SOCKET;
+        pfd->desc.s = lr->sd;
+        pfd->reqevents = APR_POLLIN;
+        pfd->client_data = lr;
+
+        rv = apr_pollset_add(worker_pollset, pfd);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(03286)
+                         "Couldn't create add listener to pollset;"
+                         " check system or user limits");
+            /* let the parent decide how bad this really is */
+            clean_child_exit(APEXIT_CHILDSICK);
+        }
+
+        lr->accept_func = ap_unixd_accept;
+    }
+
+    worker_sockets = apr_pcalloc(pruntime, threads_per_child *
+                                           sizeof(apr_socket_t *));
+}
+
+/* XXX under some circumstances not understood, children can get stuck
+ *     in start_threads forever trying to take over slots which will
+ *     never be cleaned up; for now there is an APLOG_DEBUG message issued
+ *     every so often when this condition occurs
+ */
+static void * APR_THREAD_FUNC start_threads(apr_thread_t *thd, void *dummy)
+{
+    thread_starter *ts = dummy;
+    apr_thread_t **threads = ts->threads;
+    apr_threadattr_t *thread_attr = ts->threadattr;
+    int my_child_num = ts->child_num_arg;
+    proc_info *my_info;
+    apr_status_t rv;
+    int threads_created = 0;
+    int listener_started = 0;
+    int prev_threads_created;
+    int loops, i;
+
+    loops = prev_threads_created = 0;
+    while (1) {
+        /* threads_per_child does not include the listener thread */
+        for (i = 0; i < threads_per_child; i++) {
+            int status = ap_scoreboard_image->servers[my_child_num][i].status;
+
+            if (status != SERVER_GRACEFUL && status != SERVER_DEAD) {
+                continue;
+            }
+
+            my_info = (proc_info *)ap_malloc(sizeof(proc_info));
+            my_info->pid = my_child_num;
+            my_info->tid = i;
+            my_info->sd = 0;
+
+            /* We are creating threads right now */
+            ap_update_child_status_from_indexes(my_child_num, i,
+                                                SERVER_STARTING, NULL);
+            /* We let each thread update its own scoreboard entry.  This is
+             * done because it lets us deal with tid better.
+             */
+            rv = apr_thread_create(&threads[i], thread_attr,
+                                   worker_thread, my_info, pruntime);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(03142)
+                             "apr_thread_create: unable to create worker thread");
+                /* let the parent decide how bad this really is */
+                clean_child_exit(APEXIT_CHILDSICK);
+            }
+            threads_created++;
+        }
+        /* Start the listener only when there are workers available */
+        if (!listener_started && threads_created) {
+            create_listener_thread(ts);
+            listener_started = 1;
+        }
+        if (start_thread_may_exit || threads_created == threads_per_child) {
+            break;
+        }
+        /* wait for previous generation to clean up an entry */
+        apr_sleep(apr_time_from_sec(1));
+        ++loops;
+        if (loops % 120 == 0) { /* every couple of minutes */
+            if (prev_threads_created == threads_created) {
+                ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+                             "child %" APR_PID_T_FMT " isn't taking over "
+                             "slots very quickly (%d of %d)",
+                             ap_my_pid, threads_created, threads_per_child);
+            }
+            prev_threads_created = threads_created;
+        }
+    }
+
+    /* What state should this child_main process be listed as in the
+     * scoreboard...?
+     *  ap_update_child_status_from_indexes(my_child_num, i, SERVER_STARTING,
+     *                                      (request_rec *) NULL);
+     *
+     *  This state should be listed separately in the scoreboard, in some kind
+     *  of process_status, not mixed in with the worker threads' status.
+     *  "life_status" is almost right, but it's in the worker's structure, and
+     *  the name could be clearer.   gla
+     */
+    apr_thread_exit(thd, APR_SUCCESS);
+    return NULL;
+}
+
+static void join_workers(apr_thread_t *listener, apr_thread_t **threads,
+                         int mode)
+{
+    int i;
+    apr_status_t rv, thread_rv;
+
+    if (listener) {
+        int iter;
+
+        /* deal with a rare timing window which affects waking up the
+         * listener thread...  if the signal sent to the listener thread
+         * is delivered between the time it verifies that the
+         * listener_may_exit flag is clear and the time it enters a
+         * blocking syscall, the signal didn't do any good...  work around
+         * that by sleeping briefly and sending it again
+         */
+
+        iter = 0;
+        while (iter < 10 &&
+#ifdef HAVE_PTHREAD_KILL
+               pthread_kill(*listener_os_thread, 0)
+#else
+               kill(ap_my_pid, 0)
+#endif
+               == 0) {
+            /* listener not dead yet */
+            apr_sleep(apr_time_make(0, 500000));
+            wakeup_listener();
+            ++iter;
+        }
+        if (iter >= 10) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00276)
+                         "the listener thread didn't exit");
+        }
+        else {
+            rv = apr_thread_join(&thread_rv, listener);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00277)
+                             "apr_thread_join: unable to join listener thread");
+            }
+        }
+    }
+
+    for (i = 0; i < threads_per_child; i++) {
+        if (threads[i]) { /* if we ever created this thread */
+            if (mode != ST_GRACEFUL) {
+#ifdef HAVE_PTHREAD_KILL
+                apr_os_thread_t *worker_os_thread;
+
+                apr_os_thread_get(&worker_os_thread, threads[i]);
+                pthread_kill(*worker_os_thread, WORKER_SIGNAL);
+#endif
+            }
+
+            rv = apr_thread_join(&thread_rv, threads[i]);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00278)
+                             "apr_thread_join: unable to join worker "
+                             "thread %d",
+                             i);
+            }
+        }
+    }
+}
+
+static void join_start_thread(apr_thread_t *start_thread_id)
+{
+    apr_status_t rv, thread_rv;
+
+    start_thread_may_exit = 1; /* tell it to give up in case it is still
+                                * trying to take over slots from a
+                                * previous generation
+                                */
+    rv = apr_thread_join(&thread_rv, start_thread_id);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00279)
+                     "apr_thread_join: unable to join the start "
+                     "thread");
+    }
+}
+
+static void child_main(int child_num_arg, int child_bucket)
+{
+    apr_thread_t **threads;
+    apr_status_t rv;
+    thread_starter *ts;
+    apr_threadattr_t *thread_attr;
+    apr_thread_t *start_thread_id;
+    int i;
+
+    /* for benefit of any hooks that run as this child initializes */
+    retained->mpm->mpm_state = AP_MPMQ_STARTING;
+
+    ap_my_pid = getpid();
+    ap_fatal_signal_child_setup(ap_server_conf);
+
+    /* Get a sub context for global allocations in this child, so that
+     * we can have cleanups occur when the child exits.
+     */
+    apr_pool_create(&pchild, pconf);
+    apr_pool_tag(pchild, "pchild");
+
+    /* close unused listeners and pods */
+    for (i = 0; i < retained->mpm->num_buckets; i++) {
+        if (i != child_bucket) {
+            ap_close_listeners_ex(all_buckets[i].listeners);
+            ap_mpm_podx_close(all_buckets[i].pod);
+        }
+    }
+
+    /*stuff to do before we switch id's, so we have permissions.*/
+    ap_reopen_scoreboard(pchild, NULL, 0);
+
+    rv = SAFE_ACCEPT(apr_proc_mutex_child_init(&my_bucket->mutex,
+                                    apr_proc_mutex_lockfile(my_bucket->mutex),
+                                    pchild));
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00280)
+                     "Couldn't initialize cross-process lock in child");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* done with init critical section */
+    if (ap_run_drop_privileges(pchild, ap_server_conf)) {
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    /* Just use the standard apr_setup_signal_thread to block all signals
+     * from being received.  The child processes no longer use signals for
+     * any communication with the parent process. Let's also do this before
+     * child_init() hooks are called and possibly create threads that
+     * otherwise could "steal" (implicitely) MPM's signals.
+     */
+    rv = apr_setup_signal_thread();
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00281)
+                     "Couldn't initialize signal thread");
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    ap_run_child_init(pchild, ap_server_conf);
+
+    if (ap_max_requests_per_child) {
+        requests_this_child = ap_max_requests_per_child;
+    }
+    else {
+        /* coding a value of zero means infinity */
+        requests_this_child = INT_MAX;
+    }
+
+    /* Setup threads */
+
+    /* Globals used by signal_threads() so to be initialized before */
+    setup_threads_runtime();
+
+    /* clear the storage; we may not create all our threads immediately,
+     * and we want a 0 entry to indicate a thread which was not created
+     */
+    threads = (apr_thread_t **)ap_calloc(1,
+                                  sizeof(apr_thread_t *) * threads_per_child);
+    ts = (thread_starter *)apr_palloc(pchild, sizeof(*ts));
+
+    apr_threadattr_create(&thread_attr, pchild);
+    /* 0 means PTHREAD_CREATE_JOINABLE */
+    apr_threadattr_detach_set(thread_attr, 0);
+
+    if (ap_thread_stacksize != 0) {
+        rv = apr_threadattr_stacksize_set(thread_attr, ap_thread_stacksize);
+        if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, APLOGNO(02435)
+                         "WARNING: ThreadStackSize of %" APR_SIZE_T_FMT " is "
+                         "inappropriate, using default", 
+                         ap_thread_stacksize);
+        }
+    }
+
+    ts->threads = threads;
+    ts->listener = NULL;
+    ts->child_num_arg = child_num_arg;
+    ts->threadattr = thread_attr;
+
+    rv = apr_thread_create(&start_thread_id, thread_attr, start_threads,
+                           ts, pchild);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00282)
+                     "apr_thread_create: unable to create worker thread");
+        /* let the parent decide how bad this really is */
+        clean_child_exit(APEXIT_CHILDSICK);
+    }
+
+    retained->mpm->mpm_state = AP_MPMQ_RUNNING;
+
+    /* If we are only running in one_process mode, we will want to
+     * still handle signals. */
+    if (one_process) {
+        /* Block until we get a terminating signal. */
+        apr_signal_thread(check_signal);
+        /* make sure the start thread has finished; signal_threads()
+         * and join_workers() depend on that
+         */
+        /* XXX join_start_thread() won't be awakened if one of our
+         *     threads encounters a critical error and attempts to
+         *     shutdown this child
+         */
+        join_start_thread(start_thread_id);
+        signal_threads(ST_UNGRACEFUL); /* helps us terminate a little more
+                           * quickly than the dispatch of the signal thread
+                           * beats the Pipe of Death and the browsers
+                           */
+        /* A terminating signal was received. Now join each of the
+         * workers to clean them up.
+         *   If the worker already exited, then the join frees
+         *   their resources and returns.
+         *   If the worker hasn't exited, then this blocks until
+         *   they have (then cleans up).
+         */
+        join_workers(ts->listener, threads, ST_UNGRACEFUL);
+    }
+    else { /* !one_process */
+        /* remove SIGTERM from the set of blocked signals...  if one of
+         * the other threads in the process needs to take us down
+         * (e.g., for MaxConnectionsPerChild) it will send us SIGTERM
+         */
+        unblock_signal(SIGTERM);
+        apr_signal(SIGTERM, dummy_signal_handler);
+        /* Watch for any messages from the parent over the POD */
+        while (1) {
+            rv = ap_mpm_podx_check(my_bucket->pod);
+            if (rv == AP_MPM_PODX_NORESTART) {
+                /* see if termination was triggered while we slept */
+                switch(terminate_mode) {
+                case ST_GRACEFUL:
+                    rv = AP_MPM_PODX_GRACEFUL;
+                    break;
+                case ST_UNGRACEFUL:
+                    rv = AP_MPM_PODX_RESTART;
+                    break;
+                }
+            }
+            if (rv == AP_MPM_PODX_GRACEFUL || rv == AP_MPM_PODX_RESTART) {
+                /* make sure the start thread has finished;
+                 * signal_threads() and join_workers depend on that
+                 */
+                join_start_thread(start_thread_id);
+                signal_threads(rv == AP_MPM_PODX_GRACEFUL ? ST_GRACEFUL : ST_UNGRACEFUL);
+                break;
+            }
+        }
+
+        /* A terminating signal was received. Now join each of the
+         * workers to clean them up.
+         *   If the worker already exited, then the join frees
+         *   their resources and returns.
+         *   If the worker hasn't exited, then this blocks until
+         *   they have (then cleans up).
+         */
+        join_workers(ts->listener, threads,
+                     rv == AP_MPM_PODX_GRACEFUL ? ST_GRACEFUL : ST_UNGRACEFUL);
+    }
+
+    free(threads);
+
+    clean_child_exit(resource_shortage ? APEXIT_CHILDSICK : 0);
+}
+
+static int make_child(server_rec *s, int slot, int bucket)
+{
+    int pid;
+
+    if (slot + 1 > retained->max_daemons_limit) {
+        retained->max_daemons_limit = slot + 1;
+    }
+
+    if (one_process) {
+        my_bucket = &all_buckets[0];
+
+        worker_note_child_started(slot, getpid());
+        child_main(slot, 0);
+        /* NOTREACHED */
+        ap_assert(0);
+        return -1;
+    }
+
+    if ((pid = fork()) == -1) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, APLOGNO(00283)
+                     "fork: Unable to fork new process");
+        /* fork didn't succeed.  There's no need to touch the scoreboard;
+         * if we were trying to replace a failed child process, then
+         * server_main_loop() marked its workers SERVER_DEAD, and if
+         * we were trying to replace a child process that exited normally,
+         * its worker_thread()s left SERVER_DEAD or SERVER_GRACEFUL behind.
+         */
+
+        /* In case system resources are maxxed out, we don't want
+           Apache running away with the CPU trying to fork over and
+           over and over again. */
+        apr_sleep(apr_time_from_sec(10));
+
+        return -1;
+    }
+
+    if (!pid) {
+        my_bucket = &all_buckets[bucket];
+
+#ifdef HAVE_BINDPROCESSOR
+        /* By default, AIX binds to a single processor.  This bit unbinds
+         * children which will then bind to another CPU.
+         */
+        int status = bindprocessor(BINDPROCESS, (int)getpid(),
+                               PROCESSOR_CLASS_ANY);
+        if (status != OK)
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, errno,
+                         ap_server_conf, APLOGNO(00284)
+                         "processor unbind failed");
+#endif
+        RAISE_SIGSTOP(MAKE_CHILD);
+
+        apr_signal(SIGTERM, just_die);
+        child_main(slot, bucket);
+        /* NOTREACHED */
+        ap_assert(0);
+        return -1;
+    }
+
+    if (ap_scoreboard_image->parent[slot].pid != 0) {
+        /* This new child process is squatting on the scoreboard
+         * entry owned by an exiting child process, which cannot
+         * exit until all active requests complete.
+         */
+        worker_note_child_lost_slot(slot, pid);
+    }
+    ap_scoreboard_image->parent[slot].quiescing = 0;
+    ap_scoreboard_image->parent[slot].bucket = bucket;
+    worker_note_child_started(slot, pid);
+    return 0;
+}
+
+/* start up a bunch of children */
+static void startup_children(int number_to_start)
+{
+    int i;
+
+    for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
+        if (ap_scoreboard_image->parent[i].pid != 0) {
+            continue;
+        }
+        if (make_child(ap_server_conf, i, i % retained->mpm->num_buckets) < 0) {
+            break;
+        }
+        --number_to_start;
+    }
+}
+
+static void perform_idle_server_maintenance(int child_bucket, int num_buckets)
+{
+    int i, j;
+    int idle_thread_count;
+    worker_score *ws;
+    process_score *ps;
+    int free_length;
+    int totally_free_length = 0;
+    int free_slots[MAX_SPAWN_RATE];
+    int last_non_dead;
+    int total_non_dead;
+    int active_thread_count = 0;
+
+    /* initialize the free_list */
+    free_length = 0;
+
+    idle_thread_count = 0;
+    last_non_dead = -1;
+    total_non_dead = 0;
+
+    for (i = 0; i < ap_daemons_limit; ++i) {
+        /* Initialization to satisfy the compiler. It doesn't know
+         * that threads_per_child is always > 0 */
+        int status = SERVER_DEAD;
+        int any_dying_threads = 0;
+        int any_dead_threads = 0;
+        int all_dead_threads = 1;
+        int child_threads_active = 0;
+
+        if (i >= retained->max_daemons_limit &&
+            totally_free_length == retained->idle_spawn_rate[child_bucket]) {
+            /* short cut if all active processes have been examined and
+             * enough empty scoreboard slots have been found
+             */
+            break;
+        }
+        ps = &ap_scoreboard_image->parent[i];
+        for (j = 0; j < threads_per_child; j++) {
+            ws = &ap_scoreboard_image->servers[i][j];
+            status = ws->status;
+
+            /* XXX any_dying_threads is probably no longer needed    GLA */
+            any_dying_threads = any_dying_threads ||
+                                (status == SERVER_GRACEFUL);
+            any_dead_threads = any_dead_threads || (status == SERVER_DEAD);
+            all_dead_threads = all_dead_threads &&
+                                   (status == SERVER_DEAD ||
+                                    status == SERVER_GRACEFUL);
+
+            /* We consider a starting server as idle because we started it
+             * at least a cycle ago, and if it still hasn't finished starting
+             * then we're just going to swamp things worse by forking more.
+             * So we hopefully won't need to fork more if we count it.
+             * This depends on the ordering of SERVER_READY and SERVER_STARTING.
+             */
+            if (ps->pid != 0) { /* XXX just set all_dead_threads in outer for
+                                   loop if no pid?  not much else matters */
+                if (status <= SERVER_READY &&
+                        !ps->quiescing &&
+                        ps->generation == retained->mpm->my_generation &&
+                        ps->bucket == child_bucket) {
+                    ++idle_thread_count;
+                }
+                if (status >= SERVER_READY && status < SERVER_GRACEFUL) {
+                    ++child_threads_active;
+                }
+            }
+        }
+        active_thread_count += child_threads_active;
+        if (any_dead_threads
+                && totally_free_length < retained->idle_spawn_rate[child_bucket]
+                && free_length < MAX_SPAWN_RATE / num_buckets
+                && (!ps->pid               /* no process in the slot */
+                    || ps->quiescing)) {   /* or at least one is going away */
+            if (all_dead_threads) {
+                /* great! we prefer these, because the new process can
+                 * start more threads sooner.  So prioritize this slot
+                 * by putting it ahead of any slots with active threads.
+                 *
+                 * first, make room by moving a slot that's potentially still
+                 * in use to the end of the array
+                 */
+                free_slots[free_length] = free_slots[totally_free_length];
+                free_slots[totally_free_length++] = i;
+            }
+            else {
+                /* slot is still in use - back of the bus
+                 */
+                free_slots[free_length] = i;
+            }
+            ++free_length;
+        }
+        else if (child_threads_active == threads_per_child) {
+            had_healthy_child = 1;
+        }
+        /* XXX if (!ps->quiescing)     is probably more reliable  GLA */
+        if (!any_dying_threads) {
+            last_non_dead = i;
+            ++total_non_dead;
+        }
+    }
+
+    if (retained->sick_child_detected) {
+        if (had_healthy_child) {
+            /* Assume this is a transient error, even though it may not be.  Leave
+             * the server up in case it is able to serve some requests or the
+             * problem will be resolved.
+             */
+            retained->sick_child_detected = 0;
+        }
+        else {
+            /* looks like a basket case, as no child ever fully initialized; give up.
+             */
+            retained->mpm->shutdown_pending = 1;
+            child_fatal = 1;
+            ap_log_error(APLOG_MARK, APLOG_ALERT, 0,
+                         ap_server_conf, APLOGNO(02325)
+                         "A resource shortage or other unrecoverable failure "
+                         "was encountered before any child process initialized "
+                         "successfully... httpd is exiting!");
+            /* the child already logged the failure details */
+            return;
+        }
+    }
+
+    retained->max_daemons_limit = last_non_dead + 1;
+
+    if (idle_thread_count > max_spare_threads / num_buckets) {
+        /* Kill off one child */
+        ap_mpm_podx_signal(all_buckets[child_bucket].pod,
+                           AP_MPM_PODX_GRACEFUL);
+        retained->idle_spawn_rate[child_bucket] = 1;
+    }
+    else if (idle_thread_count < min_spare_threads / num_buckets) {
+        /* terminate the free list */
+        if (free_length == 0) { /* scoreboard is full, can't fork */
+
+            if (active_thread_count >= ap_daemons_limit * threads_per_child) {
+                /* no threads are "inactive" - starting, stopping, etc. */
+                /* have we reached MaxRequestWorkers, or just getting close? */
+                if (0 == idle_thread_count) {
+                    if (!retained->maxclients_reported) {
+                        /* only report this condition once */
+                        ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00286)
+                                     "server reached MaxRequestWorkers "
+                                     "setting, consider raising the "
+                                     "MaxRequestWorkers setting");
+                        retained->maxclients_reported = 1;
+                    }
+                } else {
+                    if (!retained->near_maxclients_reported) {
+                        ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00287)
+                                     "server is within MinSpareThreads of "
+                                     "MaxRequestWorkers, consider raising the "
+                                     "MaxRequestWorkers setting");
+                        retained->near_maxclients_reported = 1;
+                    }
+                }
+            }
+            else {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0,
+                             ap_server_conf, APLOGNO(00288)
+                             "scoreboard is full, not at MaxRequestWorkers");
+            }
+            retained->idle_spawn_rate[child_bucket] = 1;
+        }
+        else {
+            if (free_length > retained->idle_spawn_rate[child_bucket]) {
+                free_length = retained->idle_spawn_rate[child_bucket];
+            }
+            if (retained->idle_spawn_rate[child_bucket] >= 8) {
+                ap_log_error(APLOG_MARK, APLOG_INFO, 0,
+                             ap_server_conf, APLOGNO(00289)
+                             "server seems busy, (you may need "
+                             "to increase StartServers, ThreadsPerChild "
+                             "or Min/MaxSpareThreads), "
+                             "spawning %d children, there are around %d idle "
+                             "threads, and %d total children", free_length,
+                             idle_thread_count, total_non_dead);
+            }
+            for (i = 0; i < free_length; ++i) {
+                make_child(ap_server_conf, free_slots[i], child_bucket);
+            }
+            /* the next time around we want to spawn twice as many if this
+             * wasn't good enough, but not if we've just done a graceful
+             */
+            if (retained->hold_off_on_exponential_spawning) {
+                --retained->hold_off_on_exponential_spawning;
+            }
+            else if (retained->idle_spawn_rate[child_bucket]
+                     < MAX_SPAWN_RATE / num_buckets) {
+                retained->idle_spawn_rate[child_bucket] *= 2;
+            }
+        }
+    }
+    else {
+        retained->idle_spawn_rate[child_bucket] = 1;
+    }
+}
+
+static void server_main_loop(int remaining_children_to_start, int num_buckets)
+{
+    ap_generation_t old_gen;
+    int child_slot;
+    apr_exit_why_e exitwhy;
+    int status, processed_status;
+    apr_proc_t pid;
+    int i;
+
+    while (!retained->mpm->restart_pending && !retained->mpm->shutdown_pending) {
+        ap_wait_or_timeout(&exitwhy, &status, &pid, pconf, ap_server_conf);
+
+        if (pid.pid != -1) {
+            processed_status = ap_process_child_status(&pid, exitwhy, status);
+            child_slot = ap_find_child_by_pid(&pid);
+            if (processed_status == APEXIT_CHILDFATAL) {
+                /* fix race condition found in PR 39311
+                 * A child created at the same time as a graceful happens 
+                 * can find the lock missing and create a fatal error.
+                 * It is not fatal for the last generation to be in this state.
+                 */
+                if (child_slot < 0
+                    || ap_get_scoreboard_process(child_slot)->generation
+                       == retained->mpm->my_generation) {
+                    retained->mpm->shutdown_pending = 1;
+                    child_fatal = 1;
+                    return;
+                }
+                else {
+                    ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00290)
+                                 "Ignoring fatal error in child of previous "
+                                 "generation (pid %ld).",
+                                 (long)pid.pid);
+                    retained->sick_child_detected = 1;
+                }
+            }
+            else if (processed_status == APEXIT_CHILDSICK) {
+                /* tell perform_idle_server_maintenance to check into this
+                 * on the next timer pop
+                 */
+                retained->sick_child_detected = 1;
+            }
+            /* non-fatal death... note that it's gone in the scoreboard. */
+            if (child_slot >= 0) {
+                process_score *ps;
+
+                for (i = 0; i < threads_per_child; i++)
+                    ap_update_child_status_from_indexes(child_slot, i,
+                                                        SERVER_DEAD, NULL);
+
+                worker_note_child_killed(child_slot, 0, 0);
+                ps = &ap_scoreboard_image->parent[child_slot];
+                ps->quiescing = 0;
+                if (processed_status == APEXIT_CHILDSICK) {
+                    /* resource shortage, minimize the fork rate */
+                    retained->idle_spawn_rate[ps->bucket] = 1;
+                }
+                else if (remaining_children_to_start
+                    && child_slot < ap_daemons_limit) {
+                    /* we're still doing a 1-for-1 replacement of dead
+                     * children with new children
+                     */
+                    make_child(ap_server_conf, child_slot, ps->bucket);
+                    --remaining_children_to_start;
+                }
+            }
+            else if (ap_unregister_extra_mpm_process(pid.pid, &old_gen) == 1) {
+                worker_note_child_killed(-1, /* already out of the scoreboard */
+                                         pid.pid, old_gen);
+                if (processed_status == APEXIT_CHILDSICK
+                    && old_gen == retained->mpm->my_generation) {
+                    /* resource shortage, minimize the fork rate */
+                    for (i = 0; i < num_buckets; i++) {
+                        retained->idle_spawn_rate[i] = 1;
+                    }
+                }
+#if APR_HAS_OTHER_CHILD
+            }
+            else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH,
+                                                status) == 0) {
+                /* handled */
+#endif
+            }
+            else if (retained->mpm->was_graceful) {
+                /* Great, we've probably just lost a slot in the
+                 * scoreboard.  Somehow we don't know about this child.
+                 */
+                ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
+                             ap_server_conf, APLOGNO(00291)
+                             "long lost child came home! (pid %ld)",
+                             (long)pid.pid);
+            }
+            /* Don't perform idle maintenance when a child dies,
+             * only do it when there's a timeout.  Remember only a
+             * finite number of children can die, and it's pretty
+             * pathological for a lot to die suddenly.
+             */
+            continue;
+        }
+        else if (remaining_children_to_start) {
+            /* we hit a 1 second timeout in which none of the previous
+             * generation of children needed to be reaped... so assume
+             * they're all done, and pick up the slack if any is left.
+             */
+            startup_children(remaining_children_to_start);
+            remaining_children_to_start = 0;
+            /* In any event we really shouldn't do the code below because
+             * few of the servers we just started are in the IDLE state
+             * yet, so we'd mistakenly create an extra server.
+             */
+            continue;
+        }
+
+        for (i = 0; i < num_buckets; i++) {
+            perform_idle_server_maintenance(i, num_buckets);
+        }
+    }
+}
+
+static int worker_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
+{
+    int num_buckets = retained->mpm->num_buckets;
+    int remaining_children_to_start;
+    int i;
+
+    ap_log_pid(pconf, ap_pid_fname);
+
+    if (!retained->mpm->was_graceful) {
+        if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+            retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+            return !OK;
+        }
+        /* fix the generation number in the global score; we just got a new,
+         * cleared scoreboard
+         */
+        ap_scoreboard_image->global->running_generation = retained->mpm->my_generation;
+    }
+
+    ap_unixd_mpm_set_signals(pconf, one_process);
+
+    /* Don't thrash since num_buckets depends on the
+     * system and the number of online CPU cores...
+     */
+    if (ap_daemons_limit < num_buckets)
+        ap_daemons_limit = num_buckets;
+    if (ap_daemons_to_start < num_buckets)
+        ap_daemons_to_start = num_buckets;
+    /* We want to create as much children at a time as the number of buckets,
+     * so to optimally accept connections (evenly distributed across buckets).
+     * Thus min_spare_threads should at least maintain num_buckets children,
+     * and max_spare_threads allow num_buckets more children w/o triggering
+     * immediately (e.g. num_buckets idle threads margin, one per bucket).
+     */
+    if (min_spare_threads < threads_per_child * (num_buckets - 1) + num_buckets)
+        min_spare_threads = threads_per_child * (num_buckets - 1) + num_buckets;
+    if (max_spare_threads < min_spare_threads + (threads_per_child + 1) * num_buckets)
+        max_spare_threads = min_spare_threads + (threads_per_child + 1) * num_buckets;
+
+    /* If we're doing a graceful_restart then we're going to see a lot
+     * of children exiting immediately when we get into the main loop
+     * below (because we just sent them AP_SIG_GRACEFUL).  This happens pretty
+     * rapidly... and for each one that exits we may start a new one, until
+     * there are at least min_spare_threads idle threads, counting across
+     * all children.  But we may be permitted to start more children than
+     * that, so we'll just keep track of how many we're
+     * supposed to start up without the 1 second penalty between each fork.
+     */
+    remaining_children_to_start = ap_daemons_to_start;
+    if (remaining_children_to_start > ap_daemons_limit) {
+        remaining_children_to_start = ap_daemons_limit;
+    }
+    if (!retained->mpm->was_graceful) {
+        startup_children(remaining_children_to_start);
+        remaining_children_to_start = 0;
+    }
+    else {
+        /* give the system some time to recover before kicking into
+            * exponential mode */
+        retained->hold_off_on_exponential_spawning = 10;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00292)
+                "%s configured -- resuming normal operations",
+                ap_get_server_description());
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00293)
+                "Server built: %s", ap_get_server_built());
+    ap_log_command_line(plog, s);
+    ap_log_mpm_common(s);
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00294)
+                "Accept mutex: %s (default: %s)",
+                (all_buckets[0].mutex)
+                    ? apr_proc_mutex_name(all_buckets[0].mutex)
+                    : "none",
+                apr_proc_mutex_defname());
+    retained->mpm->mpm_state = AP_MPMQ_RUNNING;
+
+    server_main_loop(remaining_children_to_start, num_buckets);
+    retained->mpm->mpm_state = AP_MPMQ_STOPPING;
+
+    if (retained->mpm->shutdown_pending && retained->mpm->is_ungraceful) {
+        /* Time to shut down:
+         * Kill child processes, tell them to call child_exit, etc...
+         */
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
+                               AP_MPM_PODX_RESTART);
+        }
+        ap_reclaim_child_processes(1, /* Start with SIGTERM */
+                                   worker_note_child_killed);
+
+        if (!child_fatal) {
+            /* cleanup pid file on normal shutdown */
+            ap_remove_pid(pconf, ap_pid_fname);
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, 0,
+                         ap_server_conf, APLOGNO(00295) "caught SIGTERM, shutting down");
+        }
+        return DONE;
+    }
+
+    if (retained->mpm->shutdown_pending) {
+        /* Time to gracefully shut down:
+         * Kill child processes, tell them to call child_exit, etc...
+         */
+        int active_children;
+        int index;
+        apr_time_t cutoff = 0;
+
+        /* Close our listeners, and then ask our children to do same */
+        ap_close_listeners();
+
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
+                               AP_MPM_PODX_GRACEFUL);
+        }
+        ap_relieve_child_processes(worker_note_child_killed);
+
+        if (!child_fatal) {
+            /* cleanup pid file on normal shutdown */
+            ap_remove_pid(pconf, ap_pid_fname);
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00296)
+                         "caught " AP_SIG_GRACEFUL_STOP_STRING
+                         ", shutting down gracefully");
+        }
+
+        if (ap_graceful_shutdown_timeout) {
+            cutoff = apr_time_now() +
+                     apr_time_from_sec(ap_graceful_shutdown_timeout);
+        }
+
+        /* Don't really exit until each child has finished */
+        retained->mpm->shutdown_pending = 0;
+        do {
+            /* Pause for a second */
+            apr_sleep(apr_time_from_sec(1));
+
+            /* Relieve any children which have now exited */
+            ap_relieve_child_processes(worker_note_child_killed);
+
+            active_children = 0;
+            for (index = 0; index < ap_daemons_limit; ++index) {
+                if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
+                    active_children = 1;
+                    /* Having just one child is enough to stay around */
+                    break;
+                }
+            }
+        } while (!retained->mpm->shutdown_pending && active_children &&
+                 (!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
+
+        /* We might be here because we received SIGTERM, either
+         * way, try and make sure that all of our processes are
+         * really dead.
+         */
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
+                               AP_MPM_PODX_RESTART);
+        }
+        ap_reclaim_child_processes(1, worker_note_child_killed);
+
+        return DONE;
+    }
+
+    /* we've been told to restart */
+    if (one_process) {
+        /* not worth thinking about */
+        return DONE;
+    }
+
+    /* advance to the next generation */
+    /* XXX: we really need to make sure this new generation number isn't in
+     * use by any of the children.
+     */
+    ++retained->mpm->my_generation;
+    ap_scoreboard_image->global->running_generation = retained->mpm->my_generation;
+
+    if (!retained->mpm->is_ungraceful) {
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00297)
+                     AP_SIG_GRACEFUL_STRING " received.  Doing graceful restart");
+        /* wake up the children...time to die.  But we'll have more soon */
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
+                               AP_MPM_PODX_GRACEFUL);
+        }
+
+        /* This is mostly for debugging... so that we know what is still
+         * gracefully dealing with existing request.
+         */
+
+    }
+    else {
+        /* Kill 'em all.  Since the child acts the same on the parents SIGTERM
+         * and a SIGHUP, we may as well use the same signal, because some user
+         * pthreads are stealing signals from us left and right.
+         */
+        for (i = 0; i < num_buckets; i++) {
+            ap_mpm_podx_killpg(all_buckets[i].pod, ap_daemons_limit,
+                               AP_MPM_PODX_RESTART);
+        }
+
+        ap_reclaim_child_processes(1, /* Start with SIGTERM */
+                                   worker_note_child_killed);
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00298)
+                    "SIGHUP received.  Attempting to restart");
+    }
+
+    return OK;
+}
+
+/* This really should be a post_config hook, but the error log is already
+ * redirected by that point, so we need to do this in the open_logs phase.
+ */
+static int worker_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
+{
+    int startup = 0;
+    int level_flags = 0;
+    int num_buckets = 0;
+    ap_listen_rec **listen_buckets;
+    apr_status_t rv;
+    char id[16];
+    int i;
+
+    pconf = p;
+
+    /* the reverse of pre_config, we want this only the first time around */
+    if (retained->mpm->module_loads == 1) {
+        startup = 1;
+        level_flags |= APLOG_STARTUP;
+    }
+
+    if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT | level_flags, 0,
+                     (startup ? NULL : s),
+                     "no listening sockets available, shutting down");
+        return !OK;
+    }
+
+    if (one_process) {
+        num_buckets = 1;
+    }
+    else if (retained->mpm->was_graceful) {
+        /* Preserve the number of buckets on graceful restarts. */
+        num_buckets = retained->mpm->num_buckets;
+    }
+    if ((rv = ap_duplicate_listeners(pconf, ap_server_conf,
+                                     &listen_buckets, &num_buckets))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+                     (startup ? NULL : s),
+                     "could not duplicate listeners");
+        return !OK;
+    }
+
+    all_buckets = apr_pcalloc(pconf, num_buckets * sizeof(*all_buckets));
+    for (i = 0; i < num_buckets; i++) {
+        if (!one_process && /* no POD in one_process mode */
+                (rv = ap_mpm_podx_open(pconf, &all_buckets[i].pod))) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+                         (startup ? NULL : s),
+                         "could not open pipe-of-death");
+            return !OK;
+        }
+        /* Initialize cross-process accept lock (safe accept needed only) */
+        if ((rv = SAFE_ACCEPT((apr_snprintf(id, sizeof id, "%i", i),
+                               ap_proc_mutex_create(&all_buckets[i].mutex,
+                                                    NULL, AP_ACCEPT_MUTEX_TYPE,
+                                                    id, s, pconf, 0))))) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+                         (startup ? NULL : s),
+                         "could not create accept mutex");
+            return !OK;
+        }
+        all_buckets[i].listeners = listen_buckets[i];
+    }
+
+    if (retained->mpm->max_buckets < num_buckets) {
+        int new_max, *new_ptr;
+        new_max = retained->mpm->max_buckets * 2;
+        if (new_max < num_buckets) {
+            new_max = num_buckets;
+        }
+        new_ptr = (int *)apr_palloc(ap_pglobal, new_max * sizeof(int));
+        memcpy(new_ptr, retained->idle_spawn_rate,
+               retained->mpm->num_buckets * sizeof(int));
+        retained->idle_spawn_rate = new_ptr;
+        retained->mpm->max_buckets = new_max;
+    }
+    if (retained->mpm->num_buckets < num_buckets) {
+        int rate_max = 1;
+        /* If new buckets are added, set their idle spawn rate to
+         * the highest so far, so that they get filled as quickly
+         * as the existing ones.
+         */
+        for (i = 0; i < retained->mpm->num_buckets; i++) {
+            if (rate_max < retained->idle_spawn_rate[i]) {
+                rate_max = retained->idle_spawn_rate[i];
+            }
+        }
+        for (/* up to date i */; i < num_buckets; i++) {
+            retained->idle_spawn_rate[i] = rate_max;
+        }
+    }
+    retained->mpm->num_buckets = num_buckets;
+
+    return OK;
+}
+
+static int worker_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
+                             apr_pool_t *ptemp)
+{
+    int no_detach, debug, foreground;
+    apr_status_t rv;
+    const char *userdata_key = "mpm_worker_module";
+
+    debug = ap_exists_config_define("DEBUG");
+
+    if (debug) {
+        foreground = one_process = 1;
+        no_detach = 0;
+    }
+    else {
+        one_process = ap_exists_config_define("ONE_PROCESS");
+        no_detach = ap_exists_config_define("NO_DETACH");
+        foreground = ap_exists_config_define("FOREGROUND");
+    }
+
+    ap_mutex_register(pconf, AP_ACCEPT_MUTEX_TYPE, NULL, APR_LOCK_DEFAULT, 0);
+
+    retained = ap_retained_data_get(userdata_key);
+    if (!retained) {
+        retained = ap_retained_data_create(userdata_key, sizeof(*retained));
+        retained->mpm = ap_unixd_mpm_get_retained_data();
+        retained->max_daemons_limit = -1;
+    }
+    retained->mpm->mpm_state = AP_MPMQ_STARTING;
+    if (retained->mpm->baton != retained) {
+        retained->mpm->was_graceful = 0;
+        retained->mpm->baton = retained;
+    }
+    ++retained->mpm->module_loads;
+
+    /* sigh, want this only the second time around */
+    if (retained->mpm->module_loads == 2) {
+        if (!one_process && !foreground) {
+            /* before we detach, setup crash handlers to log to errorlog */
+            ap_fatal_signal_setup(ap_server_conf, pconf);
+            rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
+                                           : APR_PROC_DETACH_DAEMONIZE);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00299)
+                             "apr_proc_detach failed");
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+        }
+    }
+
+    parent_pid = ap_my_pid = getpid();
+
+    ap_listen_pre_config();
+    ap_daemons_to_start = DEFAULT_START_DAEMON;
+    min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
+    max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
+    server_limit = DEFAULT_SERVER_LIMIT;
+    thread_limit = DEFAULT_THREAD_LIMIT;
+    ap_daemons_limit = server_limit;
+    threads_per_child = DEFAULT_THREADS_PER_CHILD;
+    max_workers = ap_daemons_limit * threads_per_child;
+    had_healthy_child = 0;
+    ap_extended_status = 0;
+
+    return OK;
+}
+
+static int worker_check_config(apr_pool_t *p, apr_pool_t *plog,
+                               apr_pool_t *ptemp, server_rec *s)
+{
+    int startup = 0;
+
+    /* the reverse of pre_config, we want this only the first time around */
+    if (retained->mpm->module_loads == 1) {
+        startup = 1;
+    }
+
+    if (server_limit > MAX_SERVER_LIMIT) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00300)
+                         "WARNING: ServerLimit of %d exceeds compile-time "
+                         "limit of %d servers, decreasing to %d.",
+                         server_limit, MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00301)
+                         "ServerLimit of %d exceeds compile-time limit "
+                         "of %d, decreasing to match",
+                         server_limit, MAX_SERVER_LIMIT);
+        }
+        server_limit = MAX_SERVER_LIMIT;
+    }
+    else if (server_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00302)
+                         "WARNING: ServerLimit of %d not allowed, "
+                         "increasing to 1.", server_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00303)
+                         "ServerLimit of %d not allowed, increasing to 1",
+                         server_limit);
+        }
+        server_limit = 1;
+    }
+
+    /* you cannot change ServerLimit across a restart; ignore
+     * any such attempts
+     */
+    if (!retained->first_server_limit) {
+        retained->first_server_limit = server_limit;
+    }
+    else if (server_limit != retained->first_server_limit) {
+        /* don't need a startup console version here */
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00304)
+                     "changing ServerLimit to %d from original value of %d "
+                     "not allowed during restart",
+                     server_limit, retained->first_server_limit);
+        server_limit = retained->first_server_limit;
+    }
+
+    if (thread_limit > MAX_THREAD_LIMIT) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00305)
+                         "WARNING: ThreadLimit of %d exceeds compile-time "
+                         "limit of %d threads, decreasing to %d.",
+                         thread_limit, MAX_THREAD_LIMIT, MAX_THREAD_LIMIT);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00306)
+                         "ThreadLimit of %d exceeds compile-time limit "
+                         "of %d, decreasing to match",
+                         thread_limit, MAX_THREAD_LIMIT);
+        }
+        thread_limit = MAX_THREAD_LIMIT;
+    }
+    else if (thread_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00307)
+                         "WARNING: ThreadLimit of %d not allowed, "
+                         "increasing to 1.", thread_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00308)
+                         "ThreadLimit of %d not allowed, increasing to 1",
+                         thread_limit);
+        }
+        thread_limit = 1;
+    }
+
+    /* you cannot change ThreadLimit across a restart; ignore
+     * any such attempts
+     */
+    if (!retained->first_thread_limit) {
+        retained->first_thread_limit = thread_limit;
+    }
+    else if (thread_limit != retained->first_thread_limit) {
+        /* don't need a startup console version here */
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00309)
+                     "changing ThreadLimit to %d from original value of %d "
+                     "not allowed during restart",
+                     thread_limit, retained->first_thread_limit);
+        thread_limit = retained->first_thread_limit;
+    }
+
+    if (threads_per_child > thread_limit) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00310)
+                         "WARNING: ThreadsPerChild of %d exceeds ThreadLimit "
+                         "of %d threads, decreasing to %d. "
+                         "To increase, please see the ThreadLimit directive.",
+                         threads_per_child, thread_limit, thread_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00311)
+                         "ThreadsPerChild of %d exceeds ThreadLimit "
+                         "of %d, decreasing to match",
+                         threads_per_child, thread_limit);
+        }
+        threads_per_child = thread_limit;
+    }
+    else if (threads_per_child < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00312)
+                         "WARNING: ThreadsPerChild of %d not allowed, "
+                         "increasing to 1.", threads_per_child);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00313)
+                         "ThreadsPerChild of %d not allowed, increasing to 1",
+                         threads_per_child);
+        }
+        threads_per_child = 1;
+    }
+
+    if (max_workers < threads_per_child) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00314)
+                         "WARNING: MaxRequestWorkers of %d is less than "
+                         "ThreadsPerChild of %d, increasing to %d. "
+                         "MaxRequestWorkers must be at least as large "
+                         "as the number of threads in a single server.",
+                         max_workers, threads_per_child, threads_per_child);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00315)
+                         "MaxRequestWorkers of %d is less than ThreadsPerChild "
+                         "of %d, increasing to match",
+                         max_workers, threads_per_child);
+        }
+        max_workers = threads_per_child;
+    }
+
+    ap_daemons_limit = max_workers / threads_per_child;
+
+    if (max_workers % threads_per_child) {
+        int tmp_max_workers = ap_daemons_limit * threads_per_child;
+
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00316)
+                         "WARNING: MaxRequestWorkers of %d is not an integer "
+                         "multiple of ThreadsPerChild of %d, decreasing to nearest "
+                         "multiple %d, for a maximum of %d servers.",
+                         max_workers, threads_per_child, tmp_max_workers,
+                         ap_daemons_limit);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00317)
+                         "MaxRequestWorkers of %d is not an integer multiple of "
+                         "ThreadsPerChild of %d, decreasing to nearest "
+                         "multiple %d", max_workers, threads_per_child,
+                         tmp_max_workers);
+        }
+        max_workers = tmp_max_workers;
+    }
+
+    if (ap_daemons_limit > server_limit) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00318)
+                         "WARNING: MaxRequestWorkers of %d would require %d "
+                         "servers and would exceed ServerLimit of %d, decreasing to %d. "
+                         "To increase, please see the ServerLimit directive.",
+                         max_workers, ap_daemons_limit, server_limit,
+                         server_limit * threads_per_child);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00319)
+                         "MaxRequestWorkers of %d would require %d servers and "
+                         "exceed ServerLimit of %d, decreasing to %d",
+                         max_workers, ap_daemons_limit, server_limit,
+                         server_limit * threads_per_child);
+        }
+        ap_daemons_limit = server_limit;
+    }
+
+    /* ap_daemons_to_start > ap_daemons_limit checked in worker_run() */
+    if (ap_daemons_to_start < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00320)
+                         "WARNING: StartServers of %d not allowed, "
+                         "increasing to 1.", ap_daemons_to_start);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00321)
+                         "StartServers of %d not allowed, increasing to 1",
+                         ap_daemons_to_start);
+        }
+        ap_daemons_to_start = 1;
+    }
+
+    if (min_spare_threads < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00322)
+                         "WARNING: MinSpareThreads of %d not allowed, "
+                         "increasing to 1 to avoid almost certain server failure. "
+                         "Please read the documentation.", min_spare_threads);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00323)
+                         "MinSpareThreads of %d not allowed, increasing to 1",
+                         min_spare_threads);
+        }
+        min_spare_threads = 1;
+    }
+
+    /* max_spare_threads < min_spare_threads + threads_per_child
+     * checked in worker_run()
+     */
+
+    return OK;
+}
+
+static void worker_hooks(apr_pool_t *p)
+{
+    /* Our open_logs hook function must run before the core's, or stderr
+     * will be redirected to a file, and the messages won't print to the
+     * console.
+     */
+    static const char *const aszSucc[] = {"core.c", NULL};
+    one_process = 0;
+
+    ap_hook_open_logs(worker_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
+    /* we need to set the MPM state before other pre-config hooks use MPM query
+     * to retrieve it, so register as REALLY_FIRST
+     */
+    ap_hook_pre_config(worker_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
+    ap_hook_check_config(worker_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm(worker_run, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_query(worker_query, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_get_name(worker_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy,
+                                        const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_daemons_to_start = atoi(arg);
+    return NULL;
+}
+
+static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    min_spare_threads = atoi(arg);
+    return NULL;
+}
+
+static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    max_spare_threads = atoi(arg);
+    return NULL;
+}
+
+static const char *set_max_workers (cmd_parms *cmd, void *dummy,
+                                     const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+    if (!strcasecmp(cmd->cmd->name, "MaxClients")) {
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00324)
+                     "MaxClients is deprecated, use MaxRequestWorkers "
+                     "instead.");
+    }
+    max_workers = atoi(arg);
+    return NULL;
+}
+
+static const char *set_threads_per_child (cmd_parms *cmd, void *dummy,
+                                          const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    threads_per_child = atoi(arg);
+    return NULL;
+}
+
+static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    server_limit = atoi(arg);
+    return NULL;
+}
+
+static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    thread_limit = atoi(arg);
+    return NULL;
+}
+
+static const command_rec worker_cmds[] = {
+LISTEN_COMMANDS,
+AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
+  "Number of child processes launched at server startup"),
+AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
+  "Minimum number of idle threads, to handle request spikes"),
+AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
+  "Maximum number of idle threads"),
+AP_INIT_TAKE1("MaxRequestWorkers", set_max_workers, NULL, RSRC_CONF,
+  "Maximum number of threads alive at the same time"),
+AP_INIT_TAKE1("MaxClients", set_max_workers, NULL, RSRC_CONF,
+  "Deprecated name of MaxRequestWorkers"),
+AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
+  "Number of threads each child creates"),
+AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
+  "Maximum number of child processes for this run of Apache"),
+AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
+  "Maximum number of worker threads per child process for this run of Apache - Upper limit for ThreadsPerChild"),
+AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
+{ NULL }
+};
+
+AP_DECLARE_MODULE(mpm_worker) = {
+    MPM20_MODULE_STUFF,
+    NULL,                       /* hook to run before apache parses args */
+    NULL,                       /* create per-directory config structure */
+    NULL,                       /* merge per-directory config structures */
+    NULL,                       /* create per-server config structure */
+    NULL,                       /* merge per-server config structures */
+    worker_cmds,                /* command apr_table_t */
+    worker_hooks                /* register_hooks */
+};
+