Adding upstream version 2.4.38.upstream/2.4.38upstream

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

1 files changed, 1289 insertions, 0 deletions

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 */