Adding upstream version 1.0.18.upstream/1.0.18upstream

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

1 files changed, 4020 insertions, 0 deletions

diff --git a/libevent/event.c b/libevent/event.c
new file mode 100644
index 0000000..7a42b73
--- /dev/null
+++ b/libevent/event.c
@@ -0,0 +1,4020 @@
+/*
+ * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
+ * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "event2/event-config.h"
+#include "evconfig-private.h"
+
+#ifdef _WIN32
+#include <winsock2.h>
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef WIN32_LEAN_AND_MEAN
+#endif
+#include <sys/types.h>
+#if !defined(_WIN32) && defined(EVENT__HAVE_SYS_TIME_H)
+#include <sys/time.h>
+#endif
+#include <sys/queue.h>
+#ifdef EVENT__HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef EVENT__HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <ctype.h>
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <time.h>
+#include <limits.h>
+#ifdef EVENT__HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#include "event2/event.h"
+#include "event2/event_struct.h"
+#include "event2/event_compat.h"
+#include "event-internal.h"
+#include "defer-internal.h"
+#include "evthread-internal.h"
+#include "event2/thread.h"
+#include "event2/util.h"
+#include "log-internal.h"
+#include "evmap-internal.h"
+#include "iocp-internal.h"
+#include "changelist-internal.h"
+#define HT_NO_CACHE_HASH_VALUES
+#include "ht-internal.h"
+#include "util-internal.h"
+
+
+#ifdef EVENT__HAVE_WORKING_KQUEUE
+#include "kqueue-internal.h"
+#endif
+
+#ifdef EVENT__HAVE_EVENT_PORTS
+extern const struct eventop evportops;
+#endif
+#ifdef EVENT__HAVE_SELECT
+extern const struct eventop selectops;
+#endif
+#ifdef EVENT__HAVE_POLL
+extern const struct eventop pollops;
+#endif
+#ifdef EVENT__HAVE_EPOLL
+extern const struct eventop epollops;
+#endif
+#ifdef EVENT__HAVE_WORKING_KQUEUE
+extern const struct eventop kqops;
+#endif
+#ifdef EVENT__HAVE_DEVPOLL
+extern const struct eventop devpollops;
+#endif
+#ifdef _WIN32
+extern const struct eventop win32ops;
+#endif
+
+/* Array of backends in order of preference. */
+static const struct eventop *eventops[] = {
+#ifdef EVENT__HAVE_EVENT_PORTS
+	&evportops,
+#endif
+#ifdef EVENT__HAVE_WORKING_KQUEUE
+	&kqops,
+#endif
+#ifdef EVENT__HAVE_EPOLL
+	&epollops,
+#endif
+#ifdef EVENT__HAVE_DEVPOLL
+	&devpollops,
+#endif
+#ifdef EVENT__HAVE_POLL
+	&pollops,
+#endif
+#ifdef EVENT__HAVE_SELECT
+	&selectops,
+#endif
+#ifdef _WIN32
+	&win32ops,
+#endif
+	NULL
+};
+
+/* Global state; deprecated */
+EVENT2_EXPORT_SYMBOL
+struct event_base *event_global_current_base_ = NULL;
+#define current_base event_global_current_base_
+
+/* Global state */
+
+static void *event_self_cbarg_ptr_ = NULL;
+
+/* Prototypes */
+static void	event_queue_insert_active(struct event_base *, struct event_callback *);
+static void	event_queue_insert_active_later(struct event_base *, struct event_callback *);
+static void	event_queue_insert_timeout(struct event_base *, struct event *);
+static void	event_queue_insert_inserted(struct event_base *, struct event *);
+static void	event_queue_remove_active(struct event_base *, struct event_callback *);
+static void	event_queue_remove_active_later(struct event_base *, struct event_callback *);
+static void	event_queue_remove_timeout(struct event_base *, struct event *);
+static void	event_queue_remove_inserted(struct event_base *, struct event *);
+static void event_queue_make_later_events_active(struct event_base *base);
+
+static int evthread_make_base_notifiable_nolock_(struct event_base *base);
+static int event_del_(struct event *ev, int blocking);
+
+#ifdef USE_REINSERT_TIMEOUT
+/* This code seems buggy; only turn it on if we find out what the trouble is. */
+static void	event_queue_reinsert_timeout(struct event_base *,struct event *, int was_common, int is_common, int old_timeout_idx);
+#endif
+
+static int	event_haveevents(struct event_base *);
+
+static int	event_process_active(struct event_base *);
+
+static int	timeout_next(struct event_base *, struct timeval **);
+static void	timeout_process(struct event_base *);
+
+static inline void	event_signal_closure(struct event_base *, struct event *ev);
+static inline void	event_persist_closure(struct event_base *, struct event *ev);
+
+static int	evthread_notify_base(struct event_base *base);
+
+static void insert_common_timeout_inorder(struct common_timeout_list *ctl,
+    struct event *ev);
+
+#ifndef EVENT__DISABLE_DEBUG_MODE
+/* These functions implement a hashtable of which 'struct event *' structures
+ * have been setup or added.  We don't want to trust the content of the struct
+ * event itself, since we're trying to work through cases where an event gets
+ * clobbered or freed.  Instead, we keep a hashtable indexed by the pointer.
+ */
+
+struct event_debug_entry {
+	HT_ENTRY(event_debug_entry) node;
+	const struct event *ptr;
+	unsigned added : 1;
+};
+
+static inline unsigned
+hash_debug_entry(const struct event_debug_entry *e)
+{
+	/* We need to do this silliness to convince compilers that we
+	 * honestly mean to cast e->ptr to an integer, and discard any
+	 * part of it that doesn't fit in an unsigned.
+	 */
+	unsigned u = (unsigned) ((ev_uintptr_t) e->ptr);
+	/* Our hashtable implementation is pretty sensitive to low bits,
+	 * and every struct event is over 64 bytes in size, so we can
+	 * just say >>6. */
+	return (u >> 6);
+}
+
+static inline int
+eq_debug_entry(const struct event_debug_entry *a,
+    const struct event_debug_entry *b)
+{
+	return a->ptr == b->ptr;
+}
+
+int event_debug_mode_on_ = 0;
+
+
+#if !defined(EVENT__DISABLE_THREAD_SUPPORT) && !defined(EVENT__DISABLE_DEBUG_MODE)
+/**
+ * @brief debug mode variable which is set for any function/structure that needs
+ *        to be shared across threads (if thread support is enabled).
+ *
+ *        When and if evthreads are initialized, this variable will be evaluated,
+ *        and if set to something other than zero, this means the evthread setup 
+ *        functions were called out of order.
+ *
+ *        See: "Locks and threading" in the documentation.
+ */
+int event_debug_created_threadable_ctx_ = 0;
+#endif
+
+/* Set if it's too late to enable event_debug_mode. */
+static int event_debug_mode_too_late = 0;
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+static void *event_debug_map_lock_ = NULL;
+#endif
+static HT_HEAD(event_debug_map, event_debug_entry) global_debug_map =
+	HT_INITIALIZER();
+
+HT_PROTOTYPE(event_debug_map, event_debug_entry, node, hash_debug_entry,
+    eq_debug_entry)
+HT_GENERATE(event_debug_map, event_debug_entry, node, hash_debug_entry,
+    eq_debug_entry, 0.5, mm_malloc, mm_realloc, mm_free)
+
+/* record that ev is now setup (that is, ready for an add) */
+static void event_debug_note_setup_(const struct event *ev)
+{
+	struct event_debug_entry *dent, find;
+
+	if (!event_debug_mode_on_)
+		goto out;
+
+	find.ptr = ev;
+	EVLOCK_LOCK(event_debug_map_lock_, 0);
+	dent = HT_FIND(event_debug_map, &global_debug_map, &find);
+	if (dent) {
+		dent->added = 0;
+	} else {
+		dent = mm_malloc(sizeof(*dent));
+		if (!dent)
+			event_err(1,
+			    "Out of memory in debugging code");
+		dent->ptr = ev;
+		dent->added = 0;
+		HT_INSERT(event_debug_map, &global_debug_map, dent);
+	}
+	EVLOCK_UNLOCK(event_debug_map_lock_, 0);
+
+out:
+	event_debug_mode_too_late = 1;
+}
+/* record that ev is no longer setup */
+static void event_debug_note_teardown_(const struct event *ev)
+{
+	struct event_debug_entry *dent, find;
+
+	if (!event_debug_mode_on_)
+		goto out;
+
+	find.ptr = ev;
+	EVLOCK_LOCK(event_debug_map_lock_, 0);
+	dent = HT_REMOVE(event_debug_map, &global_debug_map, &find);
+	if (dent)
+		mm_free(dent);
+	EVLOCK_UNLOCK(event_debug_map_lock_, 0);
+
+out:
+	event_debug_mode_too_late = 1;
+}
+/* Macro: record that ev is now added */
+static void event_debug_note_add_(const struct event *ev)
+{
+	struct event_debug_entry *dent,find;
+
+	if (!event_debug_mode_on_)
+		goto out;
+
+	find.ptr = ev;
+	EVLOCK_LOCK(event_debug_map_lock_, 0);
+	dent = HT_FIND(event_debug_map, &global_debug_map, &find);
+	if (dent) {
+		dent->added = 1;
+	} else {
+		event_errx(EVENT_ERR_ABORT_,
+		    "%s: noting an add on a non-setup event %p"
+		    " (events: 0x%x, fd: "EV_SOCK_FMT
+		    ", flags: 0x%x)",
+		    __func__, ev, ev->ev_events,
+		    EV_SOCK_ARG(ev->ev_fd), ev->ev_flags);
+	}
+	EVLOCK_UNLOCK(event_debug_map_lock_, 0);
+
+out:
+	event_debug_mode_too_late = 1;
+}
+/* record that ev is no longer added */
+static void event_debug_note_del_(const struct event *ev)
+{
+	struct event_debug_entry *dent, find;
+
+	if (!event_debug_mode_on_)
+		goto out;
+
+	find.ptr = ev;
+	EVLOCK_LOCK(event_debug_map_lock_, 0);
+	dent = HT_FIND(event_debug_map, &global_debug_map, &find);
+	if (dent) {
+		dent->added = 0;
+	} else {
+		event_errx(EVENT_ERR_ABORT_,
+		    "%s: noting a del on a non-setup event %p"
+		    " (events: 0x%x, fd: "EV_SOCK_FMT
+		    ", flags: 0x%x)",
+		    __func__, ev, ev->ev_events,
+		    EV_SOCK_ARG(ev->ev_fd), ev->ev_flags);
+	}
+	EVLOCK_UNLOCK(event_debug_map_lock_, 0);
+
+out:
+	event_debug_mode_too_late = 1;
+}
+/* assert that ev is setup (i.e., okay to add or inspect) */
+static void event_debug_assert_is_setup_(const struct event *ev)
+{
+	struct event_debug_entry *dent, find;
+
+	if (!event_debug_mode_on_)
+		return;
+
+	find.ptr = ev;
+	EVLOCK_LOCK(event_debug_map_lock_, 0);
+	dent = HT_FIND(event_debug_map, &global_debug_map, &find);
+	if (!dent) {
+		event_errx(EVENT_ERR_ABORT_,
+		    "%s called on a non-initialized event %p"
+		    " (events: 0x%x, fd: "EV_SOCK_FMT
+		    ", flags: 0x%x)",
+		    __func__, ev, ev->ev_events,
+		    EV_SOCK_ARG(ev->ev_fd), ev->ev_flags);
+	}
+	EVLOCK_UNLOCK(event_debug_map_lock_, 0);
+}
+/* assert that ev is not added (i.e., okay to tear down or set up again) */
+static void event_debug_assert_not_added_(const struct event *ev)
+{
+	struct event_debug_entry *dent, find;
+
+	if (!event_debug_mode_on_)
+		return;
+
+	find.ptr = ev;
+	EVLOCK_LOCK(event_debug_map_lock_, 0);
+	dent = HT_FIND(event_debug_map, &global_debug_map, &find);
+	if (dent && dent->added) {
+		event_errx(EVENT_ERR_ABORT_,
+		    "%s called on an already added event %p"
+		    " (events: 0x%x, fd: "EV_SOCK_FMT", "
+		    "flags: 0x%x)",
+		    __func__, ev, ev->ev_events,
+		    EV_SOCK_ARG(ev->ev_fd), ev->ev_flags);
+	}
+	EVLOCK_UNLOCK(event_debug_map_lock_, 0);
+}
+static void event_debug_assert_socket_nonblocking_(evutil_socket_t fd)
+{
+	if (!event_debug_mode_on_)
+		return;
+	if (fd < 0)
+		return;
+
+#ifndef _WIN32
+	{
+		int flags;
+		if ((flags = fcntl(fd, F_GETFL, NULL)) >= 0) {
+			EVUTIL_ASSERT(flags & O_NONBLOCK);
+		}
+	}
+#endif
+}
+#else
+static void event_debug_note_setup_(const struct event *ev) { (void)ev; }
+static void event_debug_note_teardown_(const struct event *ev) { (void)ev; }
+static void event_debug_note_add_(const struct event *ev) { (void)ev; }
+static void event_debug_note_del_(const struct event *ev) { (void)ev; }
+static void event_debug_assert_is_setup_(const struct event *ev) { (void)ev; }
+static void event_debug_assert_not_added_(const struct event *ev) { (void)ev; }
+static void event_debug_assert_socket_nonblocking_(evutil_socket_t fd) { (void)fd; }
+#endif
+
+#define EVENT_BASE_ASSERT_LOCKED(base)		\
+	EVLOCK_ASSERT_LOCKED((base)->th_base_lock)
+
+/* How often (in seconds) do we check for changes in wall clock time relative
+ * to monotonic time?  Set this to -1 for 'never.' */
+#define CLOCK_SYNC_INTERVAL 5
+
+/** Set 'tp' to the current time according to 'base'.  We must hold the lock
+ * on 'base'.  If there is a cached time, return it.  Otherwise, use
+ * clock_gettime or gettimeofday as appropriate to find out the right time.
+ * Return 0 on success, -1 on failure.
+ */
+static int
+gettime(struct event_base *base, struct timeval *tp)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+
+	if (base->tv_cache.tv_sec) {
+		*tp = base->tv_cache;
+		return (0);
+	}
+
+	if (evutil_gettime_monotonic_(&base->monotonic_timer, tp) == -1) {
+		return -1;
+	}
+
+	if (base->last_updated_clock_diff + CLOCK_SYNC_INTERVAL
+	    < tp->tv_sec) {
+		struct timeval tv;
+		evutil_gettimeofday(&tv,NULL);
+		evutil_timersub(&tv, tp, &base->tv_clock_diff);
+		base->last_updated_clock_diff = tp->tv_sec;
+	}
+
+	return 0;
+}
+
+int
+event_base_gettimeofday_cached(struct event_base *base, struct timeval *tv)
+{
+	int r;
+	if (!base) {
+		base = current_base;
+		if (!current_base)
+			return evutil_gettimeofday(tv, NULL);
+	}
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	if (base->tv_cache.tv_sec == 0) {
+		r = evutil_gettimeofday(tv, NULL);
+	} else {
+		evutil_timeradd(&base->tv_cache, &base->tv_clock_diff, tv);
+		r = 0;
+	}
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return r;
+}
+
+/** Make 'base' have no current cached time. */
+static inline void
+clear_time_cache(struct event_base *base)
+{
+	base->tv_cache.tv_sec = 0;
+}
+
+/** Replace the cached time in 'base' with the current time. */
+static inline void
+update_time_cache(struct event_base *base)
+{
+	base->tv_cache.tv_sec = 0;
+	if (!(base->flags & EVENT_BASE_FLAG_NO_CACHE_TIME))
+	    gettime(base, &base->tv_cache);
+}
+
+int
+event_base_update_cache_time(struct event_base *base)
+{
+
+	if (!base) {
+		base = current_base;
+		if (!current_base)
+			return -1;
+	}
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	if (base->running_loop)
+		update_time_cache(base);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return 0;
+}
+
+static inline struct event *
+event_callback_to_event(struct event_callback *evcb)
+{
+	EVUTIL_ASSERT((evcb->evcb_flags & EVLIST_INIT));
+	return EVUTIL_UPCAST(evcb, struct event, ev_evcallback);
+}
+
+static inline struct event_callback *
+event_to_event_callback(struct event *ev)
+{
+	return &ev->ev_evcallback;
+}
+
+struct event_base *
+event_init(void)
+{
+	struct event_base *base = event_base_new_with_config(NULL);
+
+	if (base == NULL) {
+		event_errx(1, "%s: Unable to construct event_base", __func__);
+		return NULL;
+	}
+
+	current_base = base;
+
+	return (base);
+}
+
+struct event_base *
+event_base_new(void)
+{
+	struct event_base *base = NULL;
+	struct event_config *cfg = event_config_new();
+	if (cfg) {
+		base = event_base_new_with_config(cfg);
+		event_config_free(cfg);
+	}
+	return base;
+}
+
+/** Return true iff 'method' is the name of a method that 'cfg' tells us to
+ * avoid. */
+static int
+event_config_is_avoided_method(const struct event_config *cfg,
+    const char *method)
+{
+	struct event_config_entry *entry;
+
+	TAILQ_FOREACH(entry, &cfg->entries, next) {
+		if (entry->avoid_method != NULL &&
+		    strcmp(entry->avoid_method, method) == 0)
+			return (1);
+	}
+
+	return (0);
+}
+
+/** Return true iff 'method' is disabled according to the environment. */
+static int
+event_is_method_disabled(const char *name)
+{
+	char environment[64];
+	int i;
+
+	evutil_snprintf(environment, sizeof(environment), "EVENT_NO%s", name);
+	for (i = 8; environment[i] != '\0'; ++i)
+		environment[i] = EVUTIL_TOUPPER_(environment[i]);
+	/* Note that evutil_getenv_() ignores the environment entirely if
+	 * we're setuid */
+	return (evutil_getenv_(environment) != NULL);
+}
+
+int
+event_base_get_features(const struct event_base *base)
+{
+	return base->evsel->features;
+}
+
+void
+event_enable_debug_mode(void)
+{
+#ifndef EVENT__DISABLE_DEBUG_MODE
+	if (event_debug_mode_on_)
+		event_errx(1, "%s was called twice!", __func__);
+	if (event_debug_mode_too_late)
+		event_errx(1, "%s must be called *before* creating any events "
+		    "or event_bases",__func__);
+
+	event_debug_mode_on_ = 1;
+
+	HT_INIT(event_debug_map, &global_debug_map);
+#endif
+}
+
+void
+event_disable_debug_mode(void)
+{
+#ifndef EVENT__DISABLE_DEBUG_MODE
+	struct event_debug_entry **ent, *victim;
+
+	EVLOCK_LOCK(event_debug_map_lock_, 0);
+	for (ent = HT_START(event_debug_map, &global_debug_map); ent; ) {
+		victim = *ent;
+		ent = HT_NEXT_RMV(event_debug_map, &global_debug_map, ent);
+		mm_free(victim);
+	}
+	HT_CLEAR(event_debug_map, &global_debug_map);
+	EVLOCK_UNLOCK(event_debug_map_lock_ , 0);
+
+	event_debug_mode_on_  = 0;
+#endif
+}
+
+struct event_base *
+event_base_new_with_config(const struct event_config *cfg)
+{
+	int i;
+	struct event_base *base;
+	int should_check_environment;
+
+#ifndef EVENT__DISABLE_DEBUG_MODE
+	event_debug_mode_too_late = 1;
+#endif
+
+	if ((base = mm_calloc(1, sizeof(struct event_base))) == NULL) {
+		event_warn("%s: calloc", __func__);
+		return NULL;
+	}
+
+	if (cfg)
+		base->flags = cfg->flags;
+
+	should_check_environment =
+	    !(cfg && (cfg->flags & EVENT_BASE_FLAG_IGNORE_ENV));
+
+	{
+		struct timeval tmp;
+		int precise_time =
+		    cfg && (cfg->flags & EVENT_BASE_FLAG_PRECISE_TIMER);
+		int flags;
+		if (should_check_environment && !precise_time) {
+			precise_time = evutil_getenv_("EVENT_PRECISE_TIMER") != NULL;
+			if (precise_time) {
+				base->flags |= EVENT_BASE_FLAG_PRECISE_TIMER;
+			}
+		}
+		flags = precise_time ? EV_MONOT_PRECISE : 0;
+		evutil_configure_monotonic_time_(&base->monotonic_timer, flags);
+
+		gettime(base, &tmp);
+	}
+
+	min_heap_ctor_(&base->timeheap);
+
+	base->sig.ev_signal_pair[0] = -1;
+	base->sig.ev_signal_pair[1] = -1;
+	base->th_notify_fd[0] = -1;
+	base->th_notify_fd[1] = -1;
+
+	TAILQ_INIT(&base->active_later_queue);
+
+	evmap_io_initmap_(&base->io);
+	evmap_signal_initmap_(&base->sigmap);
+	event_changelist_init_(&base->changelist);
+
+	base->evbase = NULL;
+
+	if (cfg) {
+		memcpy(&base->max_dispatch_time,
+		    &cfg->max_dispatch_interval, sizeof(struct timeval));
+		base->limit_callbacks_after_prio =
+		    cfg->limit_callbacks_after_prio;
+	} else {
+		base->max_dispatch_time.tv_sec = -1;
+		base->limit_callbacks_after_prio = 1;
+	}
+	if (cfg && cfg->max_dispatch_callbacks >= 0) {
+		base->max_dispatch_callbacks = cfg->max_dispatch_callbacks;
+	} else {
+		base->max_dispatch_callbacks = INT_MAX;
+	}
+	if (base->max_dispatch_callbacks == INT_MAX &&
+	    base->max_dispatch_time.tv_sec == -1)
+		base->limit_callbacks_after_prio = INT_MAX;
+
+	for (i = 0; eventops[i] && !base->evbase; i++) {
+		if (cfg != NULL) {
+			/* determine if this backend should be avoided */
+			if (event_config_is_avoided_method(cfg,
+				eventops[i]->name))
+				continue;
+			if ((eventops[i]->features & cfg->require_features)
+			    != cfg->require_features)
+				continue;
+		}
+
+		/* also obey the environment variables */
+		if (should_check_environment &&
+		    event_is_method_disabled(eventops[i]->name))
+			continue;
+
+		base->evsel = eventops[i];
+
+		base->evbase = base->evsel->init(base);
+	}
+
+	if (base->evbase == NULL) {
+		event_warnx("%s: no event mechanism available",
+		    __func__);
+		base->evsel = NULL;
+		event_base_free(base);
+		return NULL;
+	}
+
+	if (evutil_getenv_("EVENT_SHOW_METHOD"))
+		event_msgx("libevent using: %s", base->evsel->name);
+
+	/* allocate a single active event queue */
+	if (event_base_priority_init(base, 1) < 0) {
+		event_base_free(base);
+		return NULL;
+	}
+
+	/* prepare for threading */
+
+#if !defined(EVENT__DISABLE_THREAD_SUPPORT) && !defined(EVENT__DISABLE_DEBUG_MODE)
+	event_debug_created_threadable_ctx_ = 1;
+#endif
+
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+	if (EVTHREAD_LOCKING_ENABLED() &&
+	    (!cfg || !(cfg->flags & EVENT_BASE_FLAG_NOLOCK))) {
+		int r;
+		EVTHREAD_ALLOC_LOCK(base->th_base_lock, 0);
+		EVTHREAD_ALLOC_COND(base->current_event_cond);
+		r = evthread_make_base_notifiable(base);
+		if (r<0) {
+			event_warnx("%s: Unable to make base notifiable.", __func__);
+			event_base_free(base);
+			return NULL;
+		}
+	}
+#endif
+
+#ifdef _WIN32
+	if (cfg && (cfg->flags & EVENT_BASE_FLAG_STARTUP_IOCP))
+		event_base_start_iocp_(base, cfg->n_cpus_hint);
+#endif
+
+	return (base);
+}
+
+int
+event_base_start_iocp_(struct event_base *base, int n_cpus)
+{
+#ifdef _WIN32
+	if (base->iocp)
+		return 0;
+	base->iocp = event_iocp_port_launch_(n_cpus);
+	if (!base->iocp) {
+		event_warnx("%s: Couldn't launch IOCP", __func__);
+		return -1;
+	}
+	return 0;
+#else
+	return -1;
+#endif
+}
+
+void
+event_base_stop_iocp_(struct event_base *base)
+{
+#ifdef _WIN32
+	int rv;
+
+	if (!base->iocp)
+		return;
+	rv = event_iocp_shutdown_(base->iocp, -1);
+	EVUTIL_ASSERT(rv >= 0);
+	base->iocp = NULL;
+#endif
+}
+
+static int
+event_base_cancel_single_callback_(struct event_base *base,
+    struct event_callback *evcb,
+    int run_finalizers)
+{
+	int result = 0;
+
+	if (evcb->evcb_flags & EVLIST_INIT) {
+		struct event *ev = event_callback_to_event(evcb);
+		if (!(ev->ev_flags & EVLIST_INTERNAL)) {
+			event_del_(ev, EVENT_DEL_EVEN_IF_FINALIZING);
+			result = 1;
+		}
+	} else {
+		EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+		event_callback_cancel_nolock_(base, evcb, 1);
+		EVBASE_RELEASE_LOCK(base, th_base_lock);
+		result = 1;
+	}
+
+	if (run_finalizers && (evcb->evcb_flags & EVLIST_FINALIZING)) {
+		switch (evcb->evcb_closure) {
+		case EV_CLOSURE_EVENT_FINALIZE:
+		case EV_CLOSURE_EVENT_FINALIZE_FREE: {
+			struct event *ev = event_callback_to_event(evcb);
+			ev->ev_evcallback.evcb_cb_union.evcb_evfinalize(ev, ev->ev_arg);
+			if (evcb->evcb_closure == EV_CLOSURE_EVENT_FINALIZE_FREE)
+				mm_free(ev);
+			break;
+		}
+		case EV_CLOSURE_CB_FINALIZE:
+			evcb->evcb_cb_union.evcb_cbfinalize(evcb, evcb->evcb_arg);
+			break;
+		default:
+			break;
+		}
+	}
+	return result;
+}
+
+static int event_base_free_queues_(struct event_base *base, int run_finalizers)
+{
+	int deleted = 0, i;
+
+	for (i = 0; i < base->nactivequeues; ++i) {
+		struct event_callback *evcb, *next;
+		for (evcb = TAILQ_FIRST(&base->activequeues[i]); evcb; ) {
+			next = TAILQ_NEXT(evcb, evcb_active_next);
+			deleted += event_base_cancel_single_callback_(base, evcb, run_finalizers);
+			evcb = next;
+		}
+	}
+
+	{
+		struct event_callback *evcb;
+		while ((evcb = TAILQ_FIRST(&base->active_later_queue))) {
+			deleted += event_base_cancel_single_callback_(base, evcb, run_finalizers);
+		}
+	}
+
+	return deleted;
+}
+
+static void
+event_base_free_(struct event_base *base, int run_finalizers)
+{
+	int i, n_deleted=0;
+	struct event *ev;
+	/* XXXX grab the lock? If there is contention when one thread frees
+	 * the base, then the contending thread will be very sad soon. */
+
+	/* event_base_free(NULL) is how to free the current_base if we
+	 * made it with event_init and forgot to hold a reference to it. */
+	if (base == NULL && current_base)
+		base = current_base;
+	/* Don't actually free NULL. */
+	if (base == NULL) {
+		event_warnx("%s: no base to free", __func__);
+		return;
+	}
+	/* XXX(niels) - check for internal events first */
+
+#ifdef _WIN32
+	event_base_stop_iocp_(base);
+#endif
+
+	/* threading fds if we have them */
+	if (base->th_notify_fd[0] != -1) {
+		event_del(&base->th_notify);
+		EVUTIL_CLOSESOCKET(base->th_notify_fd[0]);
+		if (base->th_notify_fd[1] != -1)
+			EVUTIL_CLOSESOCKET(base->th_notify_fd[1]);
+		base->th_notify_fd[0] = -1;
+		base->th_notify_fd[1] = -1;
+		event_debug_unassign(&base->th_notify);
+	}
+
+	/* Delete all non-internal events. */
+	evmap_delete_all_(base);
+
+	while ((ev = min_heap_top_(&base->timeheap)) != NULL) {
+		event_del(ev);
+		++n_deleted;
+	}
+	for (i = 0; i < base->n_common_timeouts; ++i) {
+		struct common_timeout_list *ctl =
+		    base->common_timeout_queues[i];
+		event_del(&ctl->timeout_event); /* Internal; doesn't count */
+		event_debug_unassign(&ctl->timeout_event);
+		for (ev = TAILQ_FIRST(&ctl->events); ev; ) {
+			struct event *next = TAILQ_NEXT(ev,
+			    ev_timeout_pos.ev_next_with_common_timeout);
+			if (!(ev->ev_flags & EVLIST_INTERNAL)) {
+				event_del(ev);
+				++n_deleted;
+			}
+			ev = next;
+		}
+		mm_free(ctl);
+	}
+	if (base->common_timeout_queues)
+		mm_free(base->common_timeout_queues);
+
+	for (;;) {
+		/* For finalizers we can register yet another finalizer out from
+		 * finalizer, and iff finalizer will be in active_later_queue we can
+		 * add finalizer to activequeues, and we will have events in
+		 * activequeues after this function returns, which is not what we want
+		 * (we even have an assertion for this).
+		 *
+		 * A simple case is bufferevent with underlying (i.e. filters).
+		 */
+		int i = event_base_free_queues_(base, run_finalizers);
+		event_debug(("%s: %d events freed", __func__, i));
+		if (!i) {
+			break;
+		}
+		n_deleted += i;
+	}
+
+	if (n_deleted)
+		event_debug(("%s: %d events were still set in base",
+			__func__, n_deleted));
+
+	while (LIST_FIRST(&base->once_events)) {
+		struct event_once *eonce = LIST_FIRST(&base->once_events);
+		LIST_REMOVE(eonce, next_once);
+		mm_free(eonce);
+	}
+
+	if (base->evsel != NULL && base->evsel->dealloc != NULL)
+		base->evsel->dealloc(base);
+
+	for (i = 0; i < base->nactivequeues; ++i)
+		EVUTIL_ASSERT(TAILQ_EMPTY(&base->activequeues[i]));
+
+	EVUTIL_ASSERT(min_heap_empty_(&base->timeheap));
+	min_heap_dtor_(&base->timeheap);
+
+	mm_free(base->activequeues);
+
+	evmap_io_clear_(&base->io);
+	evmap_signal_clear_(&base->sigmap);
+	event_changelist_freemem_(&base->changelist);
+
+	EVTHREAD_FREE_LOCK(base->th_base_lock, 0);
+	EVTHREAD_FREE_COND(base->current_event_cond);
+
+	/* If we're freeing current_base, there won't be a current_base. */
+	if (base == current_base)
+		current_base = NULL;
+	mm_free(base);
+}
+
+void
+event_base_free_nofinalize(struct event_base *base)
+{
+	event_base_free_(base, 0);
+}
+
+void
+event_base_free(struct event_base *base)
+{
+	event_base_free_(base, 1);
+}
+
+/* Fake eventop; used to disable the backend temporarily inside event_reinit
+ * so that we can call event_del() on an event without telling the backend.
+ */
+static int
+nil_backend_del(struct event_base *b, evutil_socket_t fd, short old,
+    short events, void *fdinfo)
+{
+	return 0;
+}
+const struct eventop nil_eventop = {
+	"nil",
+	NULL, /* init: unused. */
+	NULL, /* add: unused. */
+	nil_backend_del, /* del: used, so needs to be killed. */
+	NULL, /* dispatch: unused. */
+	NULL, /* dealloc: unused. */
+	0, 0, 0
+};
+
+/* reinitialize the event base after a fork */
+int
+event_reinit(struct event_base *base)
+{
+	const struct eventop *evsel;
+	int res = 0;
+	int was_notifiable = 0;
+	int had_signal_added = 0;
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+	evsel = base->evsel;
+
+	/* check if this event mechanism requires reinit on the backend */
+	if (evsel->need_reinit) {
+		/* We're going to call event_del() on our notify events (the
+		 * ones that tell about signals and wakeup events).  But we
+		 * don't actually want to tell the backend to change its
+		 * state, since it might still share some resource (a kqueue,
+		 * an epoll fd) with the parent process, and we don't want to
+		 * delete the fds from _that_ backend, we temporarily stub out
+		 * the evsel with a replacement.
+		 */
+		base->evsel = &nil_eventop;
+	}
+
+	/* We need to re-create a new signal-notification fd and a new
+	 * thread-notification fd.  Otherwise, we'll still share those with
+	 * the parent process, which would make any notification sent to them
+	 * get received by one or both of the event loops, more or less at
+	 * random.
+	 */
+	if (base->sig.ev_signal_added) {
+		event_del_nolock_(&base->sig.ev_signal, EVENT_DEL_AUTOBLOCK);
+		event_debug_unassign(&base->sig.ev_signal);
+		memset(&base->sig.ev_signal, 0, sizeof(base->sig.ev_signal));
+		had_signal_added = 1;
+		base->sig.ev_signal_added = 0;
+	}
+	if (base->sig.ev_signal_pair[0] != -1)
+		EVUTIL_CLOSESOCKET(base->sig.ev_signal_pair[0]);
+	if (base->sig.ev_signal_pair[1] != -1)
+		EVUTIL_CLOSESOCKET(base->sig.ev_signal_pair[1]);
+	if (base->th_notify_fn != NULL) {
+		was_notifiable = 1;
+		base->th_notify_fn = NULL;
+	}
+	if (base->th_notify_fd[0] != -1) {
+		event_del_nolock_(&base->th_notify, EVENT_DEL_AUTOBLOCK);
+		EVUTIL_CLOSESOCKET(base->th_notify_fd[0]);
+		if (base->th_notify_fd[1] != -1)
+			EVUTIL_CLOSESOCKET(base->th_notify_fd[1]);
+		base->th_notify_fd[0] = -1;
+		base->th_notify_fd[1] = -1;
+		event_debug_unassign(&base->th_notify);
+	}
+
+	/* Replace the original evsel. */
+        base->evsel = evsel;
+
+	if (evsel->need_reinit) {
+		/* Reconstruct the backend through brute-force, so that we do
+		 * not share any structures with the parent process. For some
+		 * backends, this is necessary: epoll and kqueue, for
+		 * instance, have events associated with a kernel
+		 * structure. If didn't reinitialize, we'd share that
+		 * structure with the parent process, and any changes made by
+		 * the parent would affect our backend's behavior (and vice
+		 * versa).
+		 */
+		if (base->evsel->dealloc != NULL)
+			base->evsel->dealloc(base);
+		base->evbase = evsel->init(base);
+		if (base->evbase == NULL) {
+			event_errx(1,
+			   "%s: could not reinitialize event mechanism",
+			   __func__);
+			res = -1;
+			goto done;
+		}
+
+		/* Empty out the changelist (if any): we are starting from a
+		 * blank slate. */
+		event_changelist_freemem_(&base->changelist);
+
+		/* Tell the event maps to re-inform the backend about all
+		 * pending events. This will make the signal notification
+		 * event get re-created if necessary. */
+		if (evmap_reinit_(base) < 0)
+			res = -1;
+	} else {
+		res = evsig_init_(base);
+		if (res == 0 && had_signal_added) {
+			res = event_add_nolock_(&base->sig.ev_signal, NULL, 0);
+			if (res == 0)
+				base->sig.ev_signal_added = 1;
+		}
+	}
+
+	/* If we were notifiable before, and nothing just exploded, become
+	 * notifiable again. */
+	if (was_notifiable && res == 0)
+		res = evthread_make_base_notifiable_nolock_(base);
+
+done:
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return (res);
+}
+
+/* Get the monotonic time for this event_base' timer */
+int
+event_gettime_monotonic(struct event_base *base, struct timeval *tv)
+{
+  int rv = -1;
+
+  if (base && tv) {
+    EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+    rv = evutil_gettime_monotonic_(&(base->monotonic_timer), tv);
+    EVBASE_RELEASE_LOCK(base, th_base_lock);
+  }
+
+  return rv;
+}
+
+const char **
+event_get_supported_methods(void)
+{
+	static const char **methods = NULL;
+	const struct eventop **method;
+	const char **tmp;
+	int i = 0, k;
+
+	/* count all methods */
+	for (method = &eventops[0]; *method != NULL; ++method) {
+		++i;
+	}
+
+	/* allocate one more than we need for the NULL pointer */
+	tmp = mm_calloc((i + 1), sizeof(char *));
+	if (tmp == NULL)
+		return (NULL);
+
+	/* populate the array with the supported methods */
+	for (k = 0, i = 0; eventops[k] != NULL; ++k) {
+		tmp[i++] = eventops[k]->name;
+	}
+	tmp[i] = NULL;
+
+	if (methods != NULL)
+		mm_free((char**)methods);
+
+	methods = tmp;
+
+	return (methods);
+}
+
+struct event_config *
+event_config_new(void)
+{
+	struct event_config *cfg = mm_calloc(1, sizeof(*cfg));
+
+	if (cfg == NULL)
+		return (NULL);
+
+	TAILQ_INIT(&cfg->entries);
+	cfg->max_dispatch_interval.tv_sec = -1;
+	cfg->max_dispatch_callbacks = INT_MAX;
+	cfg->limit_callbacks_after_prio = 1;
+
+	return (cfg);
+}
+
+static void
+event_config_entry_free(struct event_config_entry *entry)
+{
+	if (entry->avoid_method != NULL)
+		mm_free((char *)entry->avoid_method);
+	mm_free(entry);
+}
+
+void
+event_config_free(struct event_config *cfg)
+{
+	struct event_config_entry *entry;
+
+	while ((entry = TAILQ_FIRST(&cfg->entries)) != NULL) {
+		TAILQ_REMOVE(&cfg->entries, entry, next);
+		event_config_entry_free(entry);
+	}
+	mm_free(cfg);
+}
+
+int
+event_config_set_flag(struct event_config *cfg, int flag)
+{
+	if (!cfg)
+		return -1;
+	cfg->flags |= flag;
+	return 0;
+}
+
+int
+event_config_avoid_method(struct event_config *cfg, const char *method)
+{
+	struct event_config_entry *entry = mm_malloc(sizeof(*entry));
+	if (entry == NULL)
+		return (-1);
+
+	if ((entry->avoid_method = mm_strdup(method)) == NULL) {
+		mm_free(entry);
+		return (-1);
+	}
+
+	TAILQ_INSERT_TAIL(&cfg->entries, entry, next);
+
+	return (0);
+}
+
+int
+event_config_require_features(struct event_config *cfg,
+    int features)
+{
+	if (!cfg)
+		return (-1);
+	cfg->require_features = features;
+	return (0);
+}
+
+int
+event_config_set_num_cpus_hint(struct event_config *cfg, int cpus)
+{
+	if (!cfg)
+		return (-1);
+	cfg->n_cpus_hint = cpus;
+	return (0);
+}
+
+int
+event_config_set_max_dispatch_interval(struct event_config *cfg,
+    const struct timeval *max_interval, int max_callbacks, int min_priority)
+{
+	if (max_interval)
+		memcpy(&cfg->max_dispatch_interval, max_interval,
+		    sizeof(struct timeval));
+	else
+		cfg->max_dispatch_interval.tv_sec = -1;
+	cfg->max_dispatch_callbacks =
+	    max_callbacks >= 0 ? max_callbacks : INT_MAX;
+	if (min_priority < 0)
+		min_priority = 0;
+	cfg->limit_callbacks_after_prio = min_priority;
+	return (0);
+}
+
+int
+event_priority_init(int npriorities)
+{
+	return event_base_priority_init(current_base, npriorities);
+}
+
+int
+event_base_priority_init(struct event_base *base, int npriorities)
+{
+	int i, r;
+	r = -1;
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+	if (N_ACTIVE_CALLBACKS(base) || npriorities < 1
+	    || npriorities >= EVENT_MAX_PRIORITIES)
+		goto err;
+
+	if (npriorities == base->nactivequeues)
+		goto ok;
+
+	if (base->nactivequeues) {
+		mm_free(base->activequeues);
+		base->nactivequeues = 0;
+	}
+
+	/* Allocate our priority queues */
+	base->activequeues = (struct evcallback_list *)
+	  mm_calloc(npriorities, sizeof(struct evcallback_list));
+	if (base->activequeues == NULL) {
+		event_warn("%s: calloc", __func__);
+		goto err;
+	}
+	base->nactivequeues = npriorities;
+
+	for (i = 0; i < base->nactivequeues; ++i) {
+		TAILQ_INIT(&base->activequeues[i]);
+	}
+
+ok:
+	r = 0;
+err:
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return (r);
+}
+
+int
+event_base_get_npriorities(struct event_base *base)
+{
+
+	int n;
+	if (base == NULL)
+		base = current_base;
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	n = base->nactivequeues;
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return (n);
+}
+
+int
+event_base_get_num_events(struct event_base *base, unsigned int type)
+{
+	int r = 0;
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+	if (type & EVENT_BASE_COUNT_ACTIVE)
+		r += base->event_count_active;
+
+	if (type & EVENT_BASE_COUNT_VIRTUAL)
+		r += base->virtual_event_count;
+
+	if (type & EVENT_BASE_COUNT_ADDED)
+		r += base->event_count;
+
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+
+	return r;
+}
+
+int
+event_base_get_max_events(struct event_base *base, unsigned int type, int clear)
+{
+	int r = 0;
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+	if (type & EVENT_BASE_COUNT_ACTIVE) {
+		r += base->event_count_active_max;
+		if (clear)
+			base->event_count_active_max = 0;
+	}
+
+	if (type & EVENT_BASE_COUNT_VIRTUAL) {
+		r += base->virtual_event_count_max;
+		if (clear)
+			base->virtual_event_count_max = 0;
+	}
+
+	if (type & EVENT_BASE_COUNT_ADDED) {
+		r += base->event_count_max;
+		if (clear)
+			base->event_count_max = 0;
+	}
+
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+
+	return r;
+}
+
+/* Returns true iff we're currently watching any events. */
+static int
+event_haveevents(struct event_base *base)
+{
+	/* Caller must hold th_base_lock */
+	return (base->virtual_event_count > 0 || base->event_count > 0);
+}
+
+/* "closure" function called when processing active signal events */
+static inline void
+event_signal_closure(struct event_base *base, struct event *ev)
+{
+	short ncalls;
+	int should_break;
+
+	/* Allows deletes to work */
+	ncalls = ev->ev_ncalls;
+	if (ncalls != 0)
+		ev->ev_pncalls = &ncalls;
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	while (ncalls) {
+		ncalls--;
+		ev->ev_ncalls = ncalls;
+		if (ncalls == 0)
+			ev->ev_pncalls = NULL;
+		(*ev->ev_callback)(ev->ev_fd, ev->ev_res, ev->ev_arg);
+
+		EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+		should_break = base->event_break;
+		EVBASE_RELEASE_LOCK(base, th_base_lock);
+
+		if (should_break) {
+			if (ncalls != 0)
+				ev->ev_pncalls = NULL;
+			return;
+		}
+	}
+}
+
+/* Common timeouts are special timeouts that are handled as queues rather than
+ * in the minheap.  This is more efficient than the minheap if we happen to
+ * know that we're going to get several thousands of timeout events all with
+ * the same timeout value.
+ *
+ * Since all our timeout handling code assumes timevals can be copied,
+ * assigned, etc, we can't use "magic pointer" to encode these common
+ * timeouts.  Searching through a list to see if every timeout is common could
+ * also get inefficient.  Instead, we take advantage of the fact that tv_usec
+ * is 32 bits long, but only uses 20 of those bits (since it can never be over
+ * 999999.)  We use the top bits to encode 4 bites of magic number, and 8 bits
+ * of index into the event_base's aray of common timeouts.
+ */
+
+#define MICROSECONDS_MASK       COMMON_TIMEOUT_MICROSECONDS_MASK
+#define COMMON_TIMEOUT_IDX_MASK 0x0ff00000
+#define COMMON_TIMEOUT_IDX_SHIFT 20
+#define COMMON_TIMEOUT_MASK     0xf0000000
+#define COMMON_TIMEOUT_MAGIC    0x50000000
+
+#define COMMON_TIMEOUT_IDX(tv) \
+	(((tv)->tv_usec & COMMON_TIMEOUT_IDX_MASK)>>COMMON_TIMEOUT_IDX_SHIFT)
+
+/** Return true iff if 'tv' is a common timeout in 'base' */
+static inline int
+is_common_timeout(const struct timeval *tv,
+    const struct event_base *base)
+{
+	int idx;
+	if ((tv->tv_usec & COMMON_TIMEOUT_MASK) != COMMON_TIMEOUT_MAGIC)
+		return 0;
+	idx = COMMON_TIMEOUT_IDX(tv);
+	return idx < base->n_common_timeouts;
+}
+
+/* True iff tv1 and tv2 have the same common-timeout index, or if neither
+ * one is a common timeout. */
+static inline int
+is_same_common_timeout(const struct timeval *tv1, const struct timeval *tv2)
+{
+	return (tv1->tv_usec & ~MICROSECONDS_MASK) ==
+	    (tv2->tv_usec & ~MICROSECONDS_MASK);
+}
+
+/** Requires that 'tv' is a common timeout.  Return the corresponding
+ * common_timeout_list. */
+static inline struct common_timeout_list *
+get_common_timeout_list(struct event_base *base, const struct timeval *tv)
+{
+	return base->common_timeout_queues[COMMON_TIMEOUT_IDX(tv)];
+}
+
+#if 0
+static inline int
+common_timeout_ok(const struct timeval *tv,
+    struct event_base *base)
+{
+	const struct timeval *expect =
+	    &get_common_timeout_list(base, tv)->duration;
+	return tv->tv_sec == expect->tv_sec &&
+	    tv->tv_usec == expect->tv_usec;
+}
+#endif
+
+/* Add the timeout for the first event in given common timeout list to the
+ * event_base's minheap. */
+static void
+common_timeout_schedule(struct common_timeout_list *ctl,
+    const struct timeval *now, struct event *head)
+{
+	struct timeval timeout = head->ev_timeout;
+	timeout.tv_usec &= MICROSECONDS_MASK;
+	event_add_nolock_(&ctl->timeout_event, &timeout, 1);
+}
+
+/* Callback: invoked when the timeout for a common timeout queue triggers.
+ * This means that (at least) the first event in that queue should be run,
+ * and the timeout should be rescheduled if there are more events. */
+static void
+common_timeout_callback(evutil_socket_t fd, short what, void *arg)
+{
+	struct timeval now;
+	struct common_timeout_list *ctl = arg;
+	struct event_base *base = ctl->base;
+	struct event *ev = NULL;
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	gettime(base, &now);
+	while (1) {
+		ev = TAILQ_FIRST(&ctl->events);
+		if (!ev || ev->ev_timeout.tv_sec > now.tv_sec ||
+		    (ev->ev_timeout.tv_sec == now.tv_sec &&
+			(ev->ev_timeout.tv_usec&MICROSECONDS_MASK) > now.tv_usec))
+			break;
+		event_del_nolock_(ev, EVENT_DEL_NOBLOCK);
+		event_active_nolock_(ev, EV_TIMEOUT, 1);
+	}
+	if (ev)
+		common_timeout_schedule(ctl, &now, ev);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+#define MAX_COMMON_TIMEOUTS 256
+
+const struct timeval *
+event_base_init_common_timeout(struct event_base *base,
+    const struct timeval *duration)
+{
+	int i;
+	struct timeval tv;
+	const struct timeval *result=NULL;
+	struct common_timeout_list *new_ctl;
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	if (duration->tv_usec > 1000000) {
+		memcpy(&tv, duration, sizeof(struct timeval));
+		if (is_common_timeout(duration, base))
+			tv.tv_usec &= MICROSECONDS_MASK;
+		tv.tv_sec += tv.tv_usec / 1000000;
+		tv.tv_usec %= 1000000;
+		duration = &tv;
+	}
+	for (i = 0; i < base->n_common_timeouts; ++i) {
+		const struct common_timeout_list *ctl =
+		    base->common_timeout_queues[i];
+		if (duration->tv_sec == ctl->duration.tv_sec &&
+		    duration->tv_usec ==
+		    (ctl->duration.tv_usec & MICROSECONDS_MASK)) {
+			EVUTIL_ASSERT(is_common_timeout(&ctl->duration, base));
+			result = &ctl->duration;
+			goto done;
+		}
+	}
+	if (base->n_common_timeouts == MAX_COMMON_TIMEOUTS) {
+		event_warnx("%s: Too many common timeouts already in use; "
+		    "we only support %d per event_base", __func__,
+		    MAX_COMMON_TIMEOUTS);
+		goto done;
+	}
+	if (base->n_common_timeouts_allocated == base->n_common_timeouts) {
+		int n = base->n_common_timeouts < 16 ? 16 :
+		    base->n_common_timeouts*2;
+		struct common_timeout_list **newqueues =
+		    mm_realloc(base->common_timeout_queues,
+			n*sizeof(struct common_timeout_queue *));
+		if (!newqueues) {
+			event_warn("%s: realloc",__func__);
+			goto done;
+		}
+		base->n_common_timeouts_allocated = n;
+		base->common_timeout_queues = newqueues;
+	}
+	new_ctl = mm_calloc(1, sizeof(struct common_timeout_list));
+	if (!new_ctl) {
+		event_warn("%s: calloc",__func__);
+		goto done;
+	}
+	TAILQ_INIT(&new_ctl->events);
+	new_ctl->duration.tv_sec = duration->tv_sec;
+	new_ctl->duration.tv_usec =
+	    duration->tv_usec | COMMON_TIMEOUT_MAGIC |
+	    (base->n_common_timeouts << COMMON_TIMEOUT_IDX_SHIFT);
+	evtimer_assign(&new_ctl->timeout_event, base,
+	    common_timeout_callback, new_ctl);
+	new_ctl->timeout_event.ev_flags |= EVLIST_INTERNAL;
+	event_priority_set(&new_ctl->timeout_event, 0);
+	new_ctl->base = base;
+	base->common_timeout_queues[base->n_common_timeouts++] = new_ctl;
+	result = &new_ctl->duration;
+
+done:
+	if (result)
+		EVUTIL_ASSERT(is_common_timeout(result, base));
+
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return result;
+}
+
+/* Closure function invoked when we're activating a persistent event. */
+static inline void
+event_persist_closure(struct event_base *base, struct event *ev)
+{
+	void (*evcb_callback)(evutil_socket_t, short, void *);
+
+        // Other fields of *ev that must be stored before executing
+        evutil_socket_t evcb_fd;
+        short evcb_res;
+        void *evcb_arg;
+
+	/* reschedule the persistent event if we have a timeout. */
+	if (ev->ev_io_timeout.tv_sec || ev->ev_io_timeout.tv_usec) {
+		/* If there was a timeout, we want it to run at an interval of
+		 * ev_io_timeout after the last time it was _scheduled_ for,
+		 * not ev_io_timeout after _now_.  If it fired for another
+		 * reason, though, the timeout ought to start ticking _now_. */
+		struct timeval run_at, relative_to, delay, now;
+		ev_uint32_t usec_mask = 0;
+		EVUTIL_ASSERT(is_same_common_timeout(&ev->ev_timeout,
+			&ev->ev_io_timeout));
+		gettime(base, &now);
+		if (is_common_timeout(&ev->ev_timeout, base)) {
+			delay = ev->ev_io_timeout;
+			usec_mask = delay.tv_usec & ~MICROSECONDS_MASK;
+			delay.tv_usec &= MICROSECONDS_MASK;
+			if (ev->ev_res & EV_TIMEOUT) {
+				relative_to = ev->ev_timeout;
+				relative_to.tv_usec &= MICROSECONDS_MASK;
+			} else {
+				relative_to = now;
+			}
+		} else {
+			delay = ev->ev_io_timeout;
+			if (ev->ev_res & EV_TIMEOUT) {
+				relative_to = ev->ev_timeout;
+			} else {
+				relative_to = now;
+			}
+		}
+		evutil_timeradd(&relative_to, &delay, &run_at);
+		if (evutil_timercmp(&run_at, &now, <)) {
+			/* Looks like we missed at least one invocation due to
+			 * a clock jump, not running the event loop for a
+			 * while, really slow callbacks, or
+			 * something. Reschedule relative to now.
+			 */
+			evutil_timeradd(&now, &delay, &run_at);
+		}
+		run_at.tv_usec |= usec_mask;
+		event_add_nolock_(ev, &run_at, 1);
+	}
+
+	// Save our callback before we release the lock
+	evcb_callback = ev->ev_callback;
+        evcb_fd = ev->ev_fd;
+        evcb_res = ev->ev_res;
+        evcb_arg = ev->ev_arg;
+
+	// Release the lock
+ 	EVBASE_RELEASE_LOCK(base, th_base_lock);
+
+	// Execute the callback
+        (evcb_callback)(evcb_fd, evcb_res, evcb_arg);
+}
+
+/*
+  Helper for event_process_active to process all the events in a single queue,
+  releasing the lock as we go.  This function requires that the lock be held
+  when it's invoked.  Returns -1 if we get a signal or an event_break that
+  means we should stop processing any active events now.  Otherwise returns
+  the number of non-internal event_callbacks that we processed.
+*/
+static int
+event_process_active_single_queue(struct event_base *base,
+    struct evcallback_list *activeq,
+    int max_to_process, const struct timeval *endtime)
+{
+	struct event_callback *evcb;
+	int count = 0;
+
+	EVUTIL_ASSERT(activeq != NULL);
+
+	for (evcb = TAILQ_FIRST(activeq); evcb; evcb = TAILQ_FIRST(activeq)) {
+		struct event *ev=NULL;
+		if (evcb->evcb_flags & EVLIST_INIT) {
+			ev = event_callback_to_event(evcb);
+
+			if (ev->ev_events & EV_PERSIST || ev->ev_flags & EVLIST_FINALIZING)
+				event_queue_remove_active(base, evcb);
+			else
+				event_del_nolock_(ev, EVENT_DEL_NOBLOCK);
+			event_debug((
+			    "event_process_active: event: %p, %s%s%scall %p",
+			    ev,
+			    ev->ev_res & EV_READ ? "EV_READ " : " ",
+			    ev->ev_res & EV_WRITE ? "EV_WRITE " : " ",
+			    ev->ev_res & EV_CLOSED ? "EV_CLOSED " : " ",
+			    ev->ev_callback));
+		} else {
+			event_queue_remove_active(base, evcb);
+			event_debug(("event_process_active: event_callback %p, "
+				"closure %d, call %p",
+				evcb, evcb->evcb_closure, evcb->evcb_cb_union.evcb_callback));
+		}
+
+		if (!(evcb->evcb_flags & EVLIST_INTERNAL))
+			++count;
+
+
+		base->current_event = evcb;
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+		base->current_event_waiters = 0;
+#endif
+
+		switch (evcb->evcb_closure) {
+		case EV_CLOSURE_EVENT_SIGNAL:
+			EVUTIL_ASSERT(ev != NULL);
+			event_signal_closure(base, ev);
+			break;
+		case EV_CLOSURE_EVENT_PERSIST:
+			EVUTIL_ASSERT(ev != NULL);
+			event_persist_closure(base, ev);
+			break;
+		case EV_CLOSURE_EVENT: {
+			void (*evcb_callback)(evutil_socket_t, short, void *);
+			short res;
+			EVUTIL_ASSERT(ev != NULL);
+			evcb_callback = *ev->ev_callback;
+			res = ev->ev_res;
+			EVBASE_RELEASE_LOCK(base, th_base_lock);
+			evcb_callback(ev->ev_fd, res, ev->ev_arg);
+		}
+		break;
+		case EV_CLOSURE_CB_SELF: {
+			void (*evcb_selfcb)(struct event_callback *, void *) = evcb->evcb_cb_union.evcb_selfcb;
+			EVBASE_RELEASE_LOCK(base, th_base_lock);
+			evcb_selfcb(evcb, evcb->evcb_arg);
+		}
+		break;
+		case EV_CLOSURE_EVENT_FINALIZE:
+		case EV_CLOSURE_EVENT_FINALIZE_FREE: {
+			void (*evcb_evfinalize)(struct event *, void *);
+			int evcb_closure = evcb->evcb_closure;
+			EVUTIL_ASSERT(ev != NULL);
+			base->current_event = NULL;
+			evcb_evfinalize = ev->ev_evcallback.evcb_cb_union.evcb_evfinalize;
+			EVUTIL_ASSERT((evcb->evcb_flags & EVLIST_FINALIZING));
+			EVBASE_RELEASE_LOCK(base, th_base_lock);
+			event_debug_note_teardown_(ev);
+			evcb_evfinalize(ev, ev->ev_arg);
+			if (evcb_closure == EV_CLOSURE_EVENT_FINALIZE_FREE)
+				mm_free(ev);
+		}
+		break;
+		case EV_CLOSURE_CB_FINALIZE: {
+			void (*evcb_cbfinalize)(struct event_callback *, void *) = evcb->evcb_cb_union.evcb_cbfinalize;
+			base->current_event = NULL;
+			EVUTIL_ASSERT((evcb->evcb_flags & EVLIST_FINALIZING));
+			EVBASE_RELEASE_LOCK(base, th_base_lock);
+			evcb_cbfinalize(evcb, evcb->evcb_arg);
+		}
+		break;
+		default:
+			EVUTIL_ASSERT(0);
+		}
+
+		EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+		base->current_event = NULL;
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+		if (base->current_event_waiters) {
+			base->current_event_waiters = 0;
+			EVTHREAD_COND_BROADCAST(base->current_event_cond);
+		}
+#endif
+
+		if (base->event_break)
+			return -1;
+		if (count >= max_to_process)
+			return count;
+		if (count && endtime) {
+			struct timeval now;
+			update_time_cache(base);
+			gettime(base, &now);
+			if (evutil_timercmp(&now, endtime, >=))
+				return count;
+		}
+		if (base->event_continue)
+			break;
+	}
+	return count;
+}
+
+/*
+ * Active events are stored in priority queues.  Lower priorities are always
+ * process before higher priorities.  Low priority events can starve high
+ * priority ones.
+ */
+
+static int
+event_process_active(struct event_base *base)
+{
+	/* Caller must hold th_base_lock */
+	struct evcallback_list *activeq = NULL;
+	int i, c = 0;
+	const struct timeval *endtime;
+	struct timeval tv;
+	const int maxcb = base->max_dispatch_callbacks;
+	const int limit_after_prio = base->limit_callbacks_after_prio;
+	if (base->max_dispatch_time.tv_sec >= 0) {
+		update_time_cache(base);
+		gettime(base, &tv);
+		evutil_timeradd(&base->max_dispatch_time, &tv, &tv);
+		endtime = &tv;
+	} else {
+		endtime = NULL;
+	}
+
+	for (i = 0; i < base->nactivequeues; ++i) {
+		if (TAILQ_FIRST(&base->activequeues[i]) != NULL) {
+			base->event_running_priority = i;
+			activeq = &base->activequeues[i];
+			if (i < limit_after_prio)
+				c = event_process_active_single_queue(base, activeq,
+				    INT_MAX, NULL);
+			else
+				c = event_process_active_single_queue(base, activeq,
+				    maxcb, endtime);
+			if (c < 0) {
+				goto done;
+			} else if (c > 0)
+				break; /* Processed a real event; do not
+					* consider lower-priority events */
+			/* If we get here, all of the events we processed
+			 * were internal.  Continue. */
+		}
+	}
+
+done:
+	base->event_running_priority = -1;
+
+	return c;
+}
+
+/*
+ * Wait continuously for events.  We exit only if no events are left.
+ */
+
+int
+event_dispatch(void)
+{
+	return (event_loop(0));
+}
+
+int
+event_base_dispatch(struct event_base *event_base)
+{
+	return (event_base_loop(event_base, 0));
+}
+
+const char *
+event_base_get_method(const struct event_base *base)
+{
+	EVUTIL_ASSERT(base);
+	return (base->evsel->name);
+}
+
+/** Callback: used to implement event_base_loopexit by telling the event_base
+ * that it's time to exit its loop. */
+static void
+event_loopexit_cb(evutil_socket_t fd, short what, void *arg)
+{
+	struct event_base *base = arg;
+	base->event_gotterm = 1;
+}
+
+int
+event_loopexit(const struct timeval *tv)
+{
+	return (event_once(-1, EV_TIMEOUT, event_loopexit_cb,
+		    current_base, tv));
+}
+
+int
+event_base_loopexit(struct event_base *event_base, const struct timeval *tv)
+{
+	return (event_base_once(event_base, -1, EV_TIMEOUT, event_loopexit_cb,
+		    event_base, tv));
+}
+
+int
+event_loopbreak(void)
+{
+	return (event_base_loopbreak(current_base));
+}
+
+int
+event_base_loopbreak(struct event_base *event_base)
+{
+	int r = 0;
+	if (event_base == NULL)
+		return (-1);
+
+	EVBASE_ACQUIRE_LOCK(event_base, th_base_lock);
+	event_base->event_break = 1;
+
+	if (EVBASE_NEED_NOTIFY(event_base)) {
+		r = evthread_notify_base(event_base);
+	} else {
+		r = (0);
+	}
+	EVBASE_RELEASE_LOCK(event_base, th_base_lock);
+	return r;
+}
+
+int
+event_base_loopcontinue(struct event_base *event_base)
+{
+	int r = 0;
+	if (event_base == NULL)
+		return (-1);
+
+	EVBASE_ACQUIRE_LOCK(event_base, th_base_lock);
+	event_base->event_continue = 1;
+
+	if (EVBASE_NEED_NOTIFY(event_base)) {
+		r = evthread_notify_base(event_base);
+	} else {
+		r = (0);
+	}
+	EVBASE_RELEASE_LOCK(event_base, th_base_lock);
+	return r;
+}
+
+int
+event_base_got_break(struct event_base *event_base)
+{
+	int res;
+	EVBASE_ACQUIRE_LOCK(event_base, th_base_lock);
+	res = event_base->event_break;
+	EVBASE_RELEASE_LOCK(event_base, th_base_lock);
+	return res;
+}
+
+int
+event_base_got_exit(struct event_base *event_base)
+{
+	int res;
+	EVBASE_ACQUIRE_LOCK(event_base, th_base_lock);
+	res = event_base->event_gotterm;
+	EVBASE_RELEASE_LOCK(event_base, th_base_lock);
+	return res;
+}
+
+/* not thread safe */
+
+int
+event_loop(int flags)
+{
+	return event_base_loop(current_base, flags);
+}
+
+int
+event_base_loop(struct event_base *base, int flags)
+{
+	const struct eventop *evsel = base->evsel;
+	struct timeval tv;
+	struct timeval *tv_p;
+	int res, done, retval = 0;
+
+	/* Grab the lock.  We will release it inside evsel.dispatch, and again
+	 * as we invoke user callbacks. */
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+	if (base->running_loop) {
+		event_warnx("%s: reentrant invocation.  Only one event_base_loop"
+		    " can run on each event_base at once.", __func__);
+		EVBASE_RELEASE_LOCK(base, th_base_lock);
+		return -1;
+	}
+
+	base->running_loop = 1;
+
+	clear_time_cache(base);
+
+	if (base->sig.ev_signal_added && base->sig.ev_n_signals_added)
+		evsig_set_base_(base);
+
+	done = 0;
+
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+	base->th_owner_id = EVTHREAD_GET_ID();
+#endif
+
+	base->event_gotterm = base->event_break = 0;
+
+	while (!done) {
+		base->event_continue = 0;
+		base->n_deferreds_queued = 0;
+
+		/* Terminate the loop if we have been asked to */
+		if (base->event_gotterm) {
+			break;
+		}
+
+		if (base->event_break) {
+			break;
+		}
+
+		tv_p = &tv;
+		if (!N_ACTIVE_CALLBACKS(base) && !(flags & EVLOOP_NONBLOCK)) {
+			timeout_next(base, &tv_p);
+		} else {
+			/*
+			 * if we have active events, we just poll new events
+			 * without waiting.
+			 */
+			evutil_timerclear(&tv);
+		}
+
+		/* If we have no events, we just exit */
+		if (0==(flags&EVLOOP_NO_EXIT_ON_EMPTY) &&
+		    !event_haveevents(base) && !N_ACTIVE_CALLBACKS(base)) {
+			event_debug(("%s: no events registered.", __func__));
+			retval = 1;
+			goto done;
+		}
+
+		event_queue_make_later_events_active(base);
+
+		clear_time_cache(base);
+
+		res = evsel->dispatch(base, tv_p);
+
+		if (res == -1) {
+			event_debug(("%s: dispatch returned unsuccessfully.",
+				__func__));
+			retval = -1;
+			goto done;
+		}
+
+		update_time_cache(base);
+
+		timeout_process(base);
+
+		if (N_ACTIVE_CALLBACKS(base)) {
+			int n = event_process_active(base);
+			if ((flags & EVLOOP_ONCE)
+			    && N_ACTIVE_CALLBACKS(base) == 0
+			    && n != 0)
+				done = 1;
+		} else if (flags & EVLOOP_NONBLOCK)
+			done = 1;
+	}
+	event_debug(("%s: asked to terminate loop.", __func__));
+
+done:
+	clear_time_cache(base);
+	base->running_loop = 0;
+
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+
+	return (retval);
+}
+
+/* One-time callback to implement event_base_once: invokes the user callback,
+ * then deletes the allocated storage */
+static void
+event_once_cb(evutil_socket_t fd, short events, void *arg)
+{
+	struct event_once *eonce = arg;
+
+	(*eonce->cb)(fd, events, eonce->arg);
+	EVBASE_ACQUIRE_LOCK(eonce->ev.ev_base, th_base_lock);
+	LIST_REMOVE(eonce, next_once);
+	EVBASE_RELEASE_LOCK(eonce->ev.ev_base, th_base_lock);
+	event_debug_unassign(&eonce->ev);
+	mm_free(eonce);
+}
+
+/* not threadsafe, event scheduled once. */
+int
+event_once(evutil_socket_t fd, short events,
+    void (*callback)(evutil_socket_t, short, void *),
+    void *arg, const struct timeval *tv)
+{
+	return event_base_once(current_base, fd, events, callback, arg, tv);
+}
+
+/* Schedules an event once */
+int
+event_base_once(struct event_base *base, evutil_socket_t fd, short events,
+    void (*callback)(evutil_socket_t, short, void *),
+    void *arg, const struct timeval *tv)
+{
+	struct event_once *eonce;
+	int res = 0;
+	int activate = 0;
+
+	if (!base)
+		return (-1);
+
+	/* We cannot support signals that just fire once, or persistent
+	 * events. */
+	if (events & (EV_SIGNAL|EV_PERSIST))
+		return (-1);
+
+	if ((eonce = mm_calloc(1, sizeof(struct event_once))) == NULL)
+		return (-1);
+
+	eonce->cb = callback;
+	eonce->arg = arg;
+
+	if ((events & (EV_TIMEOUT|EV_SIGNAL|EV_READ|EV_WRITE|EV_CLOSED)) == EV_TIMEOUT) {
+		evtimer_assign(&eonce->ev, base, event_once_cb, eonce);
+
+		if (tv == NULL || ! evutil_timerisset(tv)) {
+			/* If the event is going to become active immediately,
+			 * don't put it on the timeout queue.  This is one
+			 * idiom for scheduling a callback, so let's make
+			 * it fast (and order-preserving). */
+			activate = 1;
+		}
+	} else if (events & (EV_READ|EV_WRITE|EV_CLOSED)) {
+		events &= EV_READ|EV_WRITE|EV_CLOSED;
+
+		event_assign(&eonce->ev, base, fd, events, event_once_cb, eonce);
+	} else {
+		/* Bad event combination */
+		mm_free(eonce);
+		return (-1);
+	}
+
+	if (res == 0) {
+		EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+		if (activate)
+			event_active_nolock_(&eonce->ev, EV_TIMEOUT, 1);
+		else
+			res = event_add_nolock_(&eonce->ev, tv, 0);
+
+		if (res != 0) {
+			mm_free(eonce);
+			return (res);
+		} else {
+			LIST_INSERT_HEAD(&base->once_events, eonce, next_once);
+		}
+		EVBASE_RELEASE_LOCK(base, th_base_lock);
+	}
+
+	return (0);
+}
+
+int
+event_assign(struct event *ev, struct event_base *base, evutil_socket_t fd, short events, void (*callback)(evutil_socket_t, short, void *), void *arg)
+{
+	if (!base)
+		base = current_base;
+	if (arg == &event_self_cbarg_ptr_)
+		arg = ev;
+
+	if (!(events & EV_SIGNAL))
+		event_debug_assert_socket_nonblocking_(fd);
+	event_debug_assert_not_added_(ev);
+
+	ev->ev_base = base;
+
+	ev->ev_callback = callback;
+	ev->ev_arg = arg;
+	ev->ev_fd = fd;
+	ev->ev_events = events;
+	ev->ev_res = 0;
+	ev->ev_flags = EVLIST_INIT;
+	ev->ev_ncalls = 0;
+	ev->ev_pncalls = NULL;
+
+	if (events & EV_SIGNAL) {
+		if ((events & (EV_READ|EV_WRITE|EV_CLOSED)) != 0) {
+			event_warnx("%s: EV_SIGNAL is not compatible with "
+			    "EV_READ, EV_WRITE or EV_CLOSED", __func__);
+			return -1;
+		}
+		ev->ev_closure = EV_CLOSURE_EVENT_SIGNAL;
+	} else {
+		if (events & EV_PERSIST) {
+			evutil_timerclear(&ev->ev_io_timeout);
+			ev->ev_closure = EV_CLOSURE_EVENT_PERSIST;
+		} else {
+			ev->ev_closure = EV_CLOSURE_EVENT;
+		}
+	}
+
+	min_heap_elem_init_(ev);
+
+	if (base != NULL) {
+		/* by default, we put new events into the middle priority */
+		ev->ev_pri = base->nactivequeues / 2;
+	}
+
+	event_debug_note_setup_(ev);
+
+	return 0;
+}
+
+int
+event_base_set(struct event_base *base, struct event *ev)
+{
+	/* Only innocent events may be assigned to a different base */
+	if (ev->ev_flags != EVLIST_INIT)
+		return (-1);
+
+	event_debug_assert_is_setup_(ev);
+
+	ev->ev_base = base;
+	ev->ev_pri = base->nactivequeues/2;
+
+	return (0);
+}
+
+void
+event_set(struct event *ev, evutil_socket_t fd, short events,
+	  void (*callback)(evutil_socket_t, short, void *), void *arg)
+{
+	int r;
+	r = event_assign(ev, current_base, fd, events, callback, arg);
+	EVUTIL_ASSERT(r == 0);
+}
+
+void *
+event_self_cbarg(void)
+{
+	return &event_self_cbarg_ptr_;
+}
+
+struct event *
+event_base_get_running_event(struct event_base *base)
+{
+	struct event *ev = NULL;
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	if (EVBASE_IN_THREAD(base)) {
+		struct event_callback *evcb = base->current_event;
+		if (evcb->evcb_flags & EVLIST_INIT)
+			ev = event_callback_to_event(evcb);
+	}
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return ev;
+}
+
+struct event *
+event_new(struct event_base *base, evutil_socket_t fd, short events, void (*cb)(evutil_socket_t, short, void *), void *arg)
+{
+	struct event *ev;
+	ev = mm_malloc(sizeof(struct event));
+	if (ev == NULL)
+		return (NULL);
+	if (event_assign(ev, base, fd, events, cb, arg) < 0) {
+		mm_free(ev);
+		return (NULL);
+	}
+
+	return (ev);
+}
+
+void
+event_free(struct event *ev)
+{
+	/* This is disabled, so that events which have been finalized be a
+	 * valid target for event_free(). That's */
+	// event_debug_assert_is_setup_(ev);
+
+	/* make sure that this event won't be coming back to haunt us. */
+	event_del(ev);
+	event_debug_note_teardown_(ev);
+	mm_free(ev);
+
+}
+
+void
+event_debug_unassign(struct event *ev)
+{
+	event_debug_assert_not_added_(ev);
+	event_debug_note_teardown_(ev);
+
+	ev->ev_flags &= ~EVLIST_INIT;
+}
+
+#define EVENT_FINALIZE_FREE_ 0x10000
+static int
+event_finalize_nolock_(struct event_base *base, unsigned flags, struct event *ev, event_finalize_callback_fn cb)
+{
+	ev_uint8_t closure = (flags & EVENT_FINALIZE_FREE_) ?
+	    EV_CLOSURE_EVENT_FINALIZE_FREE : EV_CLOSURE_EVENT_FINALIZE;
+
+	event_del_nolock_(ev, EVENT_DEL_NOBLOCK);
+	ev->ev_closure = closure;
+	ev->ev_evcallback.evcb_cb_union.evcb_evfinalize = cb;
+	event_active_nolock_(ev, EV_FINALIZE, 1);
+	ev->ev_flags |= EVLIST_FINALIZING;
+	return 0;
+}
+
+static int
+event_finalize_impl_(unsigned flags, struct event *ev, event_finalize_callback_fn cb)
+{
+	int r;
+	struct event_base *base = ev->ev_base;
+	if (EVUTIL_FAILURE_CHECK(!base)) {
+		event_warnx("%s: event has no event_base set.", __func__);
+		return -1;
+	}
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	r = event_finalize_nolock_(base, flags, ev, cb);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return r;
+}
+
+int
+event_finalize(unsigned flags, struct event *ev, event_finalize_callback_fn cb)
+{
+	return event_finalize_impl_(flags, ev, cb);
+}
+
+int
+event_free_finalize(unsigned flags, struct event *ev, event_finalize_callback_fn cb)
+{
+	return event_finalize_impl_(flags|EVENT_FINALIZE_FREE_, ev, cb);
+}
+
+void
+event_callback_finalize_nolock_(struct event_base *base, unsigned flags, struct event_callback *evcb, void (*cb)(struct event_callback *, void *))
+{
+	struct event *ev = NULL;
+	if (evcb->evcb_flags & EVLIST_INIT) {
+		ev = event_callback_to_event(evcb);
+		event_del_nolock_(ev, EVENT_DEL_NOBLOCK);
+	} else {
+		event_callback_cancel_nolock_(base, evcb, 0); /*XXX can this fail?*/
+	}
+
+	evcb->evcb_closure = EV_CLOSURE_CB_FINALIZE;
+	evcb->evcb_cb_union.evcb_cbfinalize = cb;
+	event_callback_activate_nolock_(base, evcb); /* XXX can this really fail?*/
+	evcb->evcb_flags |= EVLIST_FINALIZING;
+}
+
+void
+event_callback_finalize_(struct event_base *base, unsigned flags, struct event_callback *evcb, void (*cb)(struct event_callback *, void *))
+{
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	event_callback_finalize_nolock_(base, flags, evcb, cb);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+/** Internal: Finalize all of the n_cbs callbacks in evcbs.  The provided
+ * callback will be invoked on *one of them*, after they have *all* been
+ * finalized. */
+int
+event_callback_finalize_many_(struct event_base *base, int n_cbs, struct event_callback **evcbs, void (*cb)(struct event_callback *, void *))
+{
+	int n_pending = 0, i;
+
+	if (base == NULL)
+		base = current_base;
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+	event_debug(("%s: %d events finalizing", __func__, n_cbs));
+
+	/* At most one can be currently executing; the rest we just
+	 * cancel... But we always make sure that the finalize callback
+	 * runs. */
+	for (i = 0; i < n_cbs; ++i) {
+		struct event_callback *evcb = evcbs[i];
+		if (evcb == base->current_event) {
+			event_callback_finalize_nolock_(base, 0, evcb, cb);
+			++n_pending;
+		} else {
+			event_callback_cancel_nolock_(base, evcb, 0);
+		}
+	}
+
+	if (n_pending == 0) {
+		/* Just do the first one. */
+		event_callback_finalize_nolock_(base, 0, evcbs[0], cb);
+	}
+
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return 0;
+}
+
+/*
+ * Set's the priority of an event - if an event is already scheduled
+ * changing the priority is going to fail.
+ */
+
+int
+event_priority_set(struct event *ev, int pri)
+{
+	event_debug_assert_is_setup_(ev);
+
+	if (ev->ev_flags & EVLIST_ACTIVE)
+		return (-1);
+	if (pri < 0 || pri >= ev->ev_base->nactivequeues)
+		return (-1);
+
+	ev->ev_pri = pri;
+
+	return (0);
+}
+
+/*
+ * Checks if a specific event is pending or scheduled.
+ */
+
+int
+event_pending(const struct event *ev, short event, struct timeval *tv)
+{
+	int flags = 0;
+
+	if (EVUTIL_FAILURE_CHECK(ev->ev_base == NULL)) {
+		event_warnx("%s: event has no event_base set.", __func__);
+		return 0;
+	}
+
+	EVBASE_ACQUIRE_LOCK(ev->ev_base, th_base_lock);
+	event_debug_assert_is_setup_(ev);
+
+	if (ev->ev_flags & EVLIST_INSERTED)
+		flags |= (ev->ev_events & (EV_READ|EV_WRITE|EV_CLOSED|EV_SIGNAL));
+	if (ev->ev_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER))
+		flags |= ev->ev_res;
+	if (ev->ev_flags & EVLIST_TIMEOUT)
+		flags |= EV_TIMEOUT;
+
+	event &= (EV_TIMEOUT|EV_READ|EV_WRITE|EV_CLOSED|EV_SIGNAL);
+
+	/* See if there is a timeout that we should report */
+	if (tv != NULL && (flags & event & EV_TIMEOUT)) {
+		struct timeval tmp = ev->ev_timeout;
+		tmp.tv_usec &= MICROSECONDS_MASK;
+		/* correctly remamp to real time */
+		evutil_timeradd(&ev->ev_base->tv_clock_diff, &tmp, tv);
+	}
+
+	EVBASE_RELEASE_LOCK(ev->ev_base, th_base_lock);
+
+	return (flags & event);
+}
+
+int
+event_initialized(const struct event *ev)
+{
+	if (!(ev->ev_flags & EVLIST_INIT))
+		return 0;
+
+	return 1;
+}
+
+void
+event_get_assignment(const struct event *event, struct event_base **base_out, evutil_socket_t *fd_out, short *events_out, event_callback_fn *callback_out, void **arg_out)
+{
+	event_debug_assert_is_setup_(event);
+
+	if (base_out)
+		*base_out = event->ev_base;
+	if (fd_out)
+		*fd_out = event->ev_fd;
+	if (events_out)
+		*events_out = event->ev_events;
+	if (callback_out)
+		*callback_out = event->ev_callback;
+	if (arg_out)
+		*arg_out = event->ev_arg;
+}
+
+size_t
+event_get_struct_event_size(void)
+{
+	return sizeof(struct event);
+}
+
+evutil_socket_t
+event_get_fd(const struct event *ev)
+{
+	event_debug_assert_is_setup_(ev);
+	return ev->ev_fd;
+}
+
+struct event_base *
+event_get_base(const struct event *ev)
+{
+	event_debug_assert_is_setup_(ev);
+	return ev->ev_base;
+}
+
+short
+event_get_events(const struct event *ev)
+{
+	event_debug_assert_is_setup_(ev);
+	return ev->ev_events;
+}
+
+event_callback_fn
+event_get_callback(const struct event *ev)
+{
+	event_debug_assert_is_setup_(ev);
+	return ev->ev_callback;
+}
+
+void *
+event_get_callback_arg(const struct event *ev)
+{
+	event_debug_assert_is_setup_(ev);
+	return ev->ev_arg;
+}
+
+int
+event_get_priority(const struct event *ev)
+{
+	event_debug_assert_is_setup_(ev);
+	return ev->ev_pri;
+}
+
+int
+event_add(struct event *ev, const struct timeval *tv)
+{
+	int res;
+
+	if (EVUTIL_FAILURE_CHECK(!ev->ev_base)) {
+		event_warnx("%s: event has no event_base set.", __func__);
+		return -1;
+	}
+
+	EVBASE_ACQUIRE_LOCK(ev->ev_base, th_base_lock);
+
+	res = event_add_nolock_(ev, tv, 0);
+
+	EVBASE_RELEASE_LOCK(ev->ev_base, th_base_lock);
+
+	return (res);
+}
+
+/* Helper callback: wake an event_base from another thread.  This version
+ * works by writing a byte to one end of a socketpair, so that the event_base
+ * listening on the other end will wake up as the corresponding event
+ * triggers */
+static int
+evthread_notify_base_default(struct event_base *base)
+{
+	char buf[1];
+	int r;
+	buf[0] = (char) 0;
+#ifdef _WIN32
+	r = send(base->th_notify_fd[1], buf, 1, 0);
+#else
+	r = write(base->th_notify_fd[1], buf, 1);
+#endif
+	return (r < 0 && ! EVUTIL_ERR_IS_EAGAIN(errno)) ? -1 : 0;
+}
+
+#ifdef EVENT__HAVE_EVENTFD
+/* Helper callback: wake an event_base from another thread.  This version
+ * assumes that you have a working eventfd() implementation. */
+static int
+evthread_notify_base_eventfd(struct event_base *base)
+{
+	ev_uint64_t msg = 1;
+	int r;
+	do {
+		r = write(base->th_notify_fd[0], (void*) &msg, sizeof(msg));
+	} while (r < 0 && errno == EAGAIN);
+
+	return (r < 0) ? -1 : 0;
+}
+#endif
+
+
+/** Tell the thread currently running the event_loop for base (if any) that it
+ * needs to stop waiting in its dispatch function (if it is) and process all
+ * active callbacks. */
+static int
+evthread_notify_base(struct event_base *base)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+	if (!base->th_notify_fn)
+		return -1;
+	if (base->is_notify_pending)
+		return 0;
+	base->is_notify_pending = 1;
+	return base->th_notify_fn(base);
+}
+
+/* Implementation function to remove a timeout on a currently pending event.
+ */
+int
+event_remove_timer_nolock_(struct event *ev)
+{
+	struct event_base *base = ev->ev_base;
+
+	EVENT_BASE_ASSERT_LOCKED(base);
+	event_debug_assert_is_setup_(ev);
+
+	event_debug(("event_remove_timer_nolock: event: %p", ev));
+
+	/* If it's not pending on a timeout, we don't need to do anything. */
+	if (ev->ev_flags & EVLIST_TIMEOUT) {
+		event_queue_remove_timeout(base, ev);
+		evutil_timerclear(&ev->ev_.ev_io.ev_timeout);
+	}
+
+	return (0);
+}
+
+int
+event_remove_timer(struct event *ev)
+{
+	int res;
+
+	if (EVUTIL_FAILURE_CHECK(!ev->ev_base)) {
+		event_warnx("%s: event has no event_base set.", __func__);
+		return -1;
+	}
+
+	EVBASE_ACQUIRE_LOCK(ev->ev_base, th_base_lock);
+
+	res = event_remove_timer_nolock_(ev);
+
+	EVBASE_RELEASE_LOCK(ev->ev_base, th_base_lock);
+
+	return (res);
+}
+
+/* Implementation function to add an event.  Works just like event_add,
+ * except: 1) it requires that we have the lock.  2) if tv_is_absolute is set,
+ * we treat tv as an absolute time, not as an interval to add to the current
+ * time */
+int
+event_add_nolock_(struct event *ev, const struct timeval *tv,
+    int tv_is_absolute)
+{
+	struct event_base *base = ev->ev_base;
+	int res = 0;
+	int notify = 0;
+
+	EVENT_BASE_ASSERT_LOCKED(base);
+	event_debug_assert_is_setup_(ev);
+
+	event_debug((
+		 "event_add: event: %p (fd "EV_SOCK_FMT"), %s%s%s%scall %p",
+		 ev,
+		 EV_SOCK_ARG(ev->ev_fd),
+		 ev->ev_events & EV_READ ? "EV_READ " : " ",
+		 ev->ev_events & EV_WRITE ? "EV_WRITE " : " ",
+		 ev->ev_events & EV_CLOSED ? "EV_CLOSED " : " ",
+		 tv ? "EV_TIMEOUT " : " ",
+		 ev->ev_callback));
+
+	EVUTIL_ASSERT(!(ev->ev_flags & ~EVLIST_ALL));
+
+	if (ev->ev_flags & EVLIST_FINALIZING) {
+		/* XXXX debug */
+		return (-1);
+	}
+
+	/*
+	 * prepare for timeout insertion further below, if we get a
+	 * failure on any step, we should not change any state.
+	 */
+	if (tv != NULL && !(ev->ev_flags & EVLIST_TIMEOUT)) {
+		if (min_heap_reserve_(&base->timeheap,
+			1 + min_heap_size_(&base->timeheap)) == -1)
+			return (-1);  /* ENOMEM == errno */
+	}
+
+	/* If the main thread is currently executing a signal event's
+	 * callback, and we are not the main thread, then we want to wait
+	 * until the callback is done before we mess with the event, or else
+	 * we can race on ev_ncalls and ev_pncalls below. */
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+	if (base->current_event == event_to_event_callback(ev) &&
+	    (ev->ev_events & EV_SIGNAL)
+	    && !EVBASE_IN_THREAD(base)) {
+		++base->current_event_waiters;
+		EVTHREAD_COND_WAIT(base->current_event_cond, base->th_base_lock);
+	}
+#endif
+
+	if ((ev->ev_events & (EV_READ|EV_WRITE|EV_CLOSED|EV_SIGNAL)) &&
+	    !(ev->ev_flags & (EVLIST_INSERTED|EVLIST_ACTIVE|EVLIST_ACTIVE_LATER))) {
+		if (ev->ev_events & (EV_READ|EV_WRITE|EV_CLOSED))
+			res = evmap_io_add_(base, ev->ev_fd, ev);
+		else if (ev->ev_events & EV_SIGNAL)
+			res = evmap_signal_add_(base, (int)ev->ev_fd, ev);
+		if (res != -1)
+			event_queue_insert_inserted(base, ev);
+		if (res == 1) {
+			/* evmap says we need to notify the main thread. */
+			notify = 1;
+			res = 0;
+		}
+	}
+
+	/*
+	 * we should change the timeout state only if the previous event
+	 * addition succeeded.
+	 */
+	if (res != -1 && tv != NULL) {
+		struct timeval now;
+		int common_timeout;
+#ifdef USE_REINSERT_TIMEOUT
+		int was_common;
+		int old_timeout_idx;
+#endif
+
+		/*
+		 * for persistent timeout events, we remember the
+		 * timeout value and re-add the event.
+		 *
+		 * If tv_is_absolute, this was already set.
+		 */
+		if (ev->ev_closure == EV_CLOSURE_EVENT_PERSIST && !tv_is_absolute)
+			ev->ev_io_timeout = *tv;
+
+#ifndef USE_REINSERT_TIMEOUT
+		if (ev->ev_flags & EVLIST_TIMEOUT) {
+			event_queue_remove_timeout(base, ev);
+		}
+#endif
+
+		/* Check if it is active due to a timeout.  Rescheduling
+		 * this timeout before the callback can be executed
+		 * removes it from the active list. */
+		if ((ev->ev_flags & EVLIST_ACTIVE) &&
+		    (ev->ev_res & EV_TIMEOUT)) {
+			if (ev->ev_events & EV_SIGNAL) {
+				/* See if we are just active executing
+				 * this event in a loop
+				 */
+				if (ev->ev_ncalls && ev->ev_pncalls) {
+					/* Abort loop */
+					*ev->ev_pncalls = 0;
+				}
+			}
+
+			event_queue_remove_active(base, event_to_event_callback(ev));
+		}
+
+		gettime(base, &now);
+
+		common_timeout = is_common_timeout(tv, base);
+#ifdef USE_REINSERT_TIMEOUT
+		was_common = is_common_timeout(&ev->ev_timeout, base);
+		old_timeout_idx = COMMON_TIMEOUT_IDX(&ev->ev_timeout);
+#endif
+
+		if (tv_is_absolute) {
+			ev->ev_timeout = *tv;
+		} else if (common_timeout) {
+			struct timeval tmp = *tv;
+			tmp.tv_usec &= MICROSECONDS_MASK;
+			evutil_timeradd(&now, &tmp, &ev->ev_timeout);
+			ev->ev_timeout.tv_usec |=
+			    (tv->tv_usec & ~MICROSECONDS_MASK);
+		} else {
+			evutil_timeradd(&now, tv, &ev->ev_timeout);
+		}
+
+		event_debug((
+			 "event_add: event %p, timeout in %d seconds %d useconds, call %p",
+			 ev, (int)tv->tv_sec, (int)tv->tv_usec, ev->ev_callback));
+
+#ifdef USE_REINSERT_TIMEOUT
+		event_queue_reinsert_timeout(base, ev, was_common, common_timeout, old_timeout_idx);
+#else
+		event_queue_insert_timeout(base, ev);
+#endif
+
+		if (common_timeout) {
+			struct common_timeout_list *ctl =
+			    get_common_timeout_list(base, &ev->ev_timeout);
+			if (ev == TAILQ_FIRST(&ctl->events)) {
+				common_timeout_schedule(ctl, &now, ev);
+			}
+		} else {
+			struct event* top = NULL;
+			/* See if the earliest timeout is now earlier than it
+			 * was before: if so, we will need to tell the main
+			 * thread to wake up earlier than it would otherwise.
+			 * We double check the timeout of the top element to
+			 * handle time distortions due to system suspension.
+			 */
+			if (min_heap_elt_is_top_(ev))
+				notify = 1;
+			else if ((top = min_heap_top_(&base->timeheap)) != NULL &&
+					 evutil_timercmp(&top->ev_timeout, &now, <))
+				notify = 1;
+		}
+	}
+
+	/* if we are not in the right thread, we need to wake up the loop */
+	if (res != -1 && notify && EVBASE_NEED_NOTIFY(base))
+		evthread_notify_base(base);
+
+	event_debug_note_add_(ev);
+
+	return (res);
+}
+
+static int
+event_del_(struct event *ev, int blocking)
+{
+	int res;
+	struct event_base *base = ev->ev_base;
+
+	if (EVUTIL_FAILURE_CHECK(!base)) {
+		event_warnx("%s: event has no event_base set.", __func__);
+		return -1;
+	}
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	res = event_del_nolock_(ev, blocking);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+
+	return (res);
+}
+
+int
+event_del(struct event *ev)
+{
+	return event_del_(ev, EVENT_DEL_AUTOBLOCK);
+}
+
+int
+event_del_block(struct event *ev)
+{
+	return event_del_(ev, EVENT_DEL_BLOCK);
+}
+
+int
+event_del_noblock(struct event *ev)
+{
+	return event_del_(ev, EVENT_DEL_NOBLOCK);
+}
+
+/** Helper for event_del: always called with th_base_lock held.
+ *
+ * "blocking" must be one of the EVENT_DEL_{BLOCK, NOBLOCK, AUTOBLOCK,
+ * EVEN_IF_FINALIZING} values. See those for more information.
+ */
+int
+event_del_nolock_(struct event *ev, int blocking)
+{
+	struct event_base *base;
+	int res = 0, notify = 0;
+
+	event_debug(("event_del: %p (fd "EV_SOCK_FMT"), callback %p",
+		ev, EV_SOCK_ARG(ev->ev_fd), ev->ev_callback));
+
+	/* An event without a base has not been added */
+	if (ev->ev_base == NULL)
+		return (-1);
+
+	EVENT_BASE_ASSERT_LOCKED(ev->ev_base);
+
+	if (blocking != EVENT_DEL_EVEN_IF_FINALIZING) {
+		if (ev->ev_flags & EVLIST_FINALIZING) {
+			/* XXXX Debug */
+			return 0;
+		}
+	}
+
+	base = ev->ev_base;
+
+	EVUTIL_ASSERT(!(ev->ev_flags & ~EVLIST_ALL));
+
+	/* See if we are just active executing this event in a loop */
+	if (ev->ev_events & EV_SIGNAL) {
+		if (ev->ev_ncalls && ev->ev_pncalls) {
+			/* Abort loop */
+			*ev->ev_pncalls = 0;
+		}
+	}
+
+	if (ev->ev_flags & EVLIST_TIMEOUT) {
+		/* NOTE: We never need to notify the main thread because of a
+		 * deleted timeout event: all that could happen if we don't is
+		 * that the dispatch loop might wake up too early.  But the
+		 * point of notifying the main thread _is_ to wake up the
+		 * dispatch loop early anyway, so we wouldn't gain anything by
+		 * doing it.
+		 */
+		event_queue_remove_timeout(base, ev);
+	}
+
+	if (ev->ev_flags & EVLIST_ACTIVE)
+		event_queue_remove_active(base, event_to_event_callback(ev));
+	else if (ev->ev_flags & EVLIST_ACTIVE_LATER)
+		event_queue_remove_active_later(base, event_to_event_callback(ev));
+
+	if (ev->ev_flags & EVLIST_INSERTED) {
+		event_queue_remove_inserted(base, ev);
+		if (ev->ev_events & (EV_READ|EV_WRITE|EV_CLOSED))
+			res = evmap_io_del_(base, ev->ev_fd, ev);
+		else
+			res = evmap_signal_del_(base, (int)ev->ev_fd, ev);
+		if (res == 1) {
+			/* evmap says we need to notify the main thread. */
+			notify = 1;
+			res = 0;
+		}
+		/* If we do not have events, let's notify event base so it can
+		 * exit without waiting */
+		if (!event_haveevents(base) && !N_ACTIVE_CALLBACKS(base))
+			notify = 1;
+	}
+
+	/* if we are not in the right thread, we need to wake up the loop */
+	if (res != -1 && notify && EVBASE_NEED_NOTIFY(base))
+		evthread_notify_base(base);
+
+	event_debug_note_del_(ev);
+
+	/* If the main thread is currently executing this event's callback,
+	 * and we are not the main thread, then we want to wait until the
+	 * callback is done before returning. That way, when this function
+	 * returns, it will be safe to free the user-supplied argument.
+	 */
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+	if (blocking != EVENT_DEL_NOBLOCK &&
+	    base->current_event == event_to_event_callback(ev) &&
+	    !EVBASE_IN_THREAD(base) &&
+	    (blocking == EVENT_DEL_BLOCK || !(ev->ev_events & EV_FINALIZE))) {
+		++base->current_event_waiters;
+		EVTHREAD_COND_WAIT(base->current_event_cond, base->th_base_lock);
+	}
+#endif
+
+	return (res);
+}
+
+void
+event_active(struct event *ev, int res, short ncalls)
+{
+	if (EVUTIL_FAILURE_CHECK(!ev->ev_base)) {
+		event_warnx("%s: event has no event_base set.", __func__);
+		return;
+	}
+
+	EVBASE_ACQUIRE_LOCK(ev->ev_base, th_base_lock);
+
+	event_debug_assert_is_setup_(ev);
+
+	event_active_nolock_(ev, res, ncalls);
+
+	EVBASE_RELEASE_LOCK(ev->ev_base, th_base_lock);
+}
+
+
+void
+event_active_nolock_(struct event *ev, int res, short ncalls)
+{
+	struct event_base *base;
+
+	event_debug(("event_active: %p (fd "EV_SOCK_FMT"), res %d, callback %p",
+		ev, EV_SOCK_ARG(ev->ev_fd), (int)res, ev->ev_callback));
+
+	base = ev->ev_base;
+	EVENT_BASE_ASSERT_LOCKED(base);
+
+	if (ev->ev_flags & EVLIST_FINALIZING) {
+		/* XXXX debug */
+		return;
+	}
+
+	switch ((ev->ev_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER))) {
+	default:
+	case EVLIST_ACTIVE|EVLIST_ACTIVE_LATER:
+		EVUTIL_ASSERT(0);
+		break;
+	case EVLIST_ACTIVE:
+		/* We get different kinds of events, add them together */
+		ev->ev_res |= res;
+		return;
+	case EVLIST_ACTIVE_LATER:
+		ev->ev_res |= res;
+		break;
+	case 0:
+		ev->ev_res = res;
+		break;
+	}
+
+	if (ev->ev_pri < base->event_running_priority)
+		base->event_continue = 1;
+
+	if (ev->ev_events & EV_SIGNAL) {
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+		if (base->current_event == event_to_event_callback(ev) &&
+		    !EVBASE_IN_THREAD(base)) {
+			++base->current_event_waiters;
+			EVTHREAD_COND_WAIT(base->current_event_cond, base->th_base_lock);
+		}
+#endif
+		ev->ev_ncalls = ncalls;
+		ev->ev_pncalls = NULL;
+	}
+
+	event_callback_activate_nolock_(base, event_to_event_callback(ev));
+}
+
+void
+event_active_later_(struct event *ev, int res)
+{
+	EVBASE_ACQUIRE_LOCK(ev->ev_base, th_base_lock);
+	event_active_later_nolock_(ev, res);
+	EVBASE_RELEASE_LOCK(ev->ev_base, th_base_lock);
+}
+
+void
+event_active_later_nolock_(struct event *ev, int res)
+{
+	struct event_base *base = ev->ev_base;
+	EVENT_BASE_ASSERT_LOCKED(base);
+
+	if (ev->ev_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER)) {
+		/* We get different kinds of events, add them together */
+		ev->ev_res |= res;
+		return;
+	}
+
+	ev->ev_res = res;
+
+	event_callback_activate_later_nolock_(base, event_to_event_callback(ev));
+}
+
+int
+event_callback_activate_(struct event_base *base,
+    struct event_callback *evcb)
+{
+	int r;
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	r = event_callback_activate_nolock_(base, evcb);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return r;
+}
+
+int
+event_callback_activate_nolock_(struct event_base *base,
+    struct event_callback *evcb)
+{
+	int r = 1;
+
+	if (evcb->evcb_flags & EVLIST_FINALIZING)
+		return 0;
+
+	switch (evcb->evcb_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER)) {
+	default:
+		EVUTIL_ASSERT(0);
+		EVUTIL_FALLTHROUGH;
+	case EVLIST_ACTIVE_LATER:
+		event_queue_remove_active_later(base, evcb);
+		r = 0;
+		break;
+	case EVLIST_ACTIVE:
+		return 0;
+	case 0:
+		break;
+	}
+
+	event_queue_insert_active(base, evcb);
+
+	if (EVBASE_NEED_NOTIFY(base))
+		evthread_notify_base(base);
+
+	return r;
+}
+
+int
+event_callback_activate_later_nolock_(struct event_base *base,
+    struct event_callback *evcb)
+{
+	if (evcb->evcb_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER))
+		return 0;
+
+	event_queue_insert_active_later(base, evcb);
+	if (EVBASE_NEED_NOTIFY(base))
+		evthread_notify_base(base);
+	return 1;
+}
+
+void
+event_callback_init_(struct event_base *base,
+    struct event_callback *cb)
+{
+	memset(cb, 0, sizeof(*cb));
+	cb->evcb_pri = base->nactivequeues - 1;
+}
+
+int
+event_callback_cancel_(struct event_base *base,
+    struct event_callback *evcb)
+{
+	int r;
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	r = event_callback_cancel_nolock_(base, evcb, 0);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return r;
+}
+
+int
+event_callback_cancel_nolock_(struct event_base *base,
+    struct event_callback *evcb, int even_if_finalizing)
+{
+	if ((evcb->evcb_flags & EVLIST_FINALIZING) && !even_if_finalizing)
+		return 0;
+
+	if (evcb->evcb_flags & EVLIST_INIT)
+		return event_del_nolock_(event_callback_to_event(evcb),
+		    even_if_finalizing ? EVENT_DEL_EVEN_IF_FINALIZING : EVENT_DEL_AUTOBLOCK);
+
+	switch ((evcb->evcb_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER))) {
+	default:
+	case EVLIST_ACTIVE|EVLIST_ACTIVE_LATER:
+		EVUTIL_ASSERT(0);
+		break;
+	case EVLIST_ACTIVE:
+		/* We get different kinds of events, add them together */
+		event_queue_remove_active(base, evcb);
+		return 0;
+	case EVLIST_ACTIVE_LATER:
+		event_queue_remove_active_later(base, evcb);
+		break;
+	case 0:
+		break;
+	}
+
+	return 0;
+}
+
+void
+event_deferred_cb_init_(struct event_callback *cb, ev_uint8_t priority, deferred_cb_fn fn, void *arg)
+{
+	memset(cb, 0, sizeof(*cb));
+	cb->evcb_cb_union.evcb_selfcb = fn;
+	cb->evcb_arg = arg;
+	cb->evcb_pri = priority;
+	cb->evcb_closure = EV_CLOSURE_CB_SELF;
+}
+
+void
+event_deferred_cb_set_priority_(struct event_callback *cb, ev_uint8_t priority)
+{
+	cb->evcb_pri = priority;
+}
+
+void
+event_deferred_cb_cancel_(struct event_base *base, struct event_callback *cb)
+{
+	if (!base)
+		base = current_base;
+	event_callback_cancel_(base, cb);
+}
+
+#define MAX_DEFERREDS_QUEUED 32
+int
+event_deferred_cb_schedule_(struct event_base *base, struct event_callback *cb)
+{
+	int r = 1;
+	if (!base)
+		base = current_base;
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	if (base->n_deferreds_queued > MAX_DEFERREDS_QUEUED) {
+		r = event_callback_activate_later_nolock_(base, cb);
+	} else {
+		r = event_callback_activate_nolock_(base, cb);
+		if (r) {
+			++base->n_deferreds_queued;
+		}
+	}
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return r;
+}
+
+static int
+timeout_next(struct event_base *base, struct timeval **tv_p)
+{
+	/* Caller must hold th_base_lock */
+	struct timeval now;
+	struct event *ev;
+	struct timeval *tv = *tv_p;
+	int res = 0;
+
+	ev = min_heap_top_(&base->timeheap);
+
+	if (ev == NULL) {
+		/* if no time-based events are active wait for I/O */
+		*tv_p = NULL;
+		goto out;
+	}
+
+	if (gettime(base, &now) == -1) {
+		res = -1;
+		goto out;
+	}
+
+	if (evutil_timercmp(&ev->ev_timeout, &now, <=)) {
+		evutil_timerclear(tv);
+		goto out;
+	}
+
+	evutil_timersub(&ev->ev_timeout, &now, tv);
+
+	EVUTIL_ASSERT(tv->tv_sec >= 0);
+	EVUTIL_ASSERT(tv->tv_usec >= 0);
+	event_debug(("timeout_next: event: %p, in %d seconds, %d useconds", ev, (int)tv->tv_sec, (int)tv->tv_usec));
+
+out:
+	return (res);
+}
+
+/* Activate every event whose timeout has elapsed. */
+static void
+timeout_process(struct event_base *base)
+{
+	/* Caller must hold lock. */
+	struct timeval now;
+	struct event *ev;
+
+	if (min_heap_empty_(&base->timeheap)) {
+		return;
+	}
+
+	gettime(base, &now);
+
+	while ((ev = min_heap_top_(&base->timeheap))) {
+		if (evutil_timercmp(&ev->ev_timeout, &now, >))
+			break;
+
+		/* delete this event from the I/O queues */
+		event_del_nolock_(ev, EVENT_DEL_NOBLOCK);
+
+		event_debug(("timeout_process: event: %p, call %p",
+			 ev, ev->ev_callback));
+		event_active_nolock_(ev, EV_TIMEOUT, 1);
+	}
+}
+
+#ifndef MAX
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#endif
+
+#define MAX_EVENT_COUNT(var, v) var = MAX(var, v)
+
+/* These are a fancy way to spell
+     if (~flags & EVLIST_INTERNAL)
+         base->event_count--/++;
+*/
+#define DECR_EVENT_COUNT(base,flags) \
+	((base)->event_count -= !((flags) & EVLIST_INTERNAL))
+#define INCR_EVENT_COUNT(base,flags) do {					\
+	((base)->event_count += !((flags) & EVLIST_INTERNAL));			\
+	MAX_EVENT_COUNT((base)->event_count_max, (base)->event_count);		\
+} while (0)
+
+static void
+event_queue_remove_inserted(struct event_base *base, struct event *ev)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+	if (EVUTIL_FAILURE_CHECK(!(ev->ev_flags & EVLIST_INSERTED))) {
+		event_errx(1, "%s: %p(fd "EV_SOCK_FMT") not on queue %x", __func__,
+		    ev, EV_SOCK_ARG(ev->ev_fd), EVLIST_INSERTED);
+		return;
+	}
+	DECR_EVENT_COUNT(base, ev->ev_flags);
+	ev->ev_flags &= ~EVLIST_INSERTED;
+}
+static void
+event_queue_remove_active(struct event_base *base, struct event_callback *evcb)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+	if (EVUTIL_FAILURE_CHECK(!(evcb->evcb_flags & EVLIST_ACTIVE))) {
+		event_errx(1, "%s: %p not on queue %x", __func__,
+			   evcb, EVLIST_ACTIVE);
+		return;
+	}
+	DECR_EVENT_COUNT(base, evcb->evcb_flags);
+	evcb->evcb_flags &= ~EVLIST_ACTIVE;
+	base->event_count_active--;
+
+	TAILQ_REMOVE(&base->activequeues[evcb->evcb_pri],
+	    evcb, evcb_active_next);
+}
+static void
+event_queue_remove_active_later(struct event_base *base, struct event_callback *evcb)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+	if (EVUTIL_FAILURE_CHECK(!(evcb->evcb_flags & EVLIST_ACTIVE_LATER))) {
+		event_errx(1, "%s: %p not on queue %x", __func__,
+			   evcb, EVLIST_ACTIVE_LATER);
+		return;
+	}
+	DECR_EVENT_COUNT(base, evcb->evcb_flags);
+	evcb->evcb_flags &= ~EVLIST_ACTIVE_LATER;
+	base->event_count_active--;
+
+	TAILQ_REMOVE(&base->active_later_queue, evcb, evcb_active_next);
+}
+static void
+event_queue_remove_timeout(struct event_base *base, struct event *ev)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+	if (EVUTIL_FAILURE_CHECK(!(ev->ev_flags & EVLIST_TIMEOUT))) {
+		event_errx(1, "%s: %p(fd "EV_SOCK_FMT") not on queue %x", __func__,
+		    ev, EV_SOCK_ARG(ev->ev_fd), EVLIST_TIMEOUT);
+		return;
+	}
+	DECR_EVENT_COUNT(base, ev->ev_flags);
+	ev->ev_flags &= ~EVLIST_TIMEOUT;
+
+	if (is_common_timeout(&ev->ev_timeout, base)) {
+		struct common_timeout_list *ctl =
+		    get_common_timeout_list(base, &ev->ev_timeout);
+		TAILQ_REMOVE(&ctl->events, ev,
+		    ev_timeout_pos.ev_next_with_common_timeout);
+	} else {
+		min_heap_erase_(&base->timeheap, ev);
+	}
+}
+
+#ifdef USE_REINSERT_TIMEOUT
+/* Remove and reinsert 'ev' into the timeout queue. */
+static void
+event_queue_reinsert_timeout(struct event_base *base, struct event *ev,
+    int was_common, int is_common, int old_timeout_idx)
+{
+	struct common_timeout_list *ctl;
+	if (!(ev->ev_flags & EVLIST_TIMEOUT)) {
+		event_queue_insert_timeout(base, ev);
+		return;
+	}
+
+	switch ((was_common<<1) | is_common) {
+	case 3: /* Changing from one common timeout to another */
+		ctl = base->common_timeout_queues[old_timeout_idx];
+		TAILQ_REMOVE(&ctl->events, ev,
+		    ev_timeout_pos.ev_next_with_common_timeout);
+		ctl = get_common_timeout_list(base, &ev->ev_timeout);
+		insert_common_timeout_inorder(ctl, ev);
+		break;
+	case 2: /* Was common; is no longer common */
+		ctl = base->common_timeout_queues[old_timeout_idx];
+		TAILQ_REMOVE(&ctl->events, ev,
+		    ev_timeout_pos.ev_next_with_common_timeout);
+		min_heap_push_(&base->timeheap, ev);
+		break;
+	case 1: /* Wasn't common; has become common. */
+		min_heap_erase_(&base->timeheap, ev);
+		ctl = get_common_timeout_list(base, &ev->ev_timeout);
+		insert_common_timeout_inorder(ctl, ev);
+		break;
+	case 0: /* was in heap; is still on heap. */
+		min_heap_adjust_(&base->timeheap, ev);
+		break;
+	default:
+		EVUTIL_ASSERT(0); /* unreachable */
+		break;
+	}
+}
+#endif
+
+/* Add 'ev' to the common timeout list in 'ev'. */
+static void
+insert_common_timeout_inorder(struct common_timeout_list *ctl,
+    struct event *ev)
+{
+	struct event *e;
+	/* By all logic, we should just be able to append 'ev' to the end of
+	 * ctl->events, since the timeout on each 'ev' is set to {the common
+	 * timeout} + {the time when we add the event}, and so the events
+	 * should arrive in order of their timeeouts.  But just in case
+	 * there's some wacky threading issue going on, we do a search from
+	 * the end of 'ev' to find the right insertion point.
+	 */
+	TAILQ_FOREACH_REVERSE(e, &ctl->events,
+	    event_list, ev_timeout_pos.ev_next_with_common_timeout) {
+		/* This timercmp is a little sneaky, since both ev and e have
+		 * magic values in tv_usec.  Fortunately, they ought to have
+		 * the _same_ magic values in tv_usec.  Let's assert for that.
+		 */
+		EVUTIL_ASSERT(
+			is_same_common_timeout(&e->ev_timeout, &ev->ev_timeout));
+		if (evutil_timercmp(&ev->ev_timeout, &e->ev_timeout, >=)) {
+			TAILQ_INSERT_AFTER(&ctl->events, e, ev,
+			    ev_timeout_pos.ev_next_with_common_timeout);
+			return;
+		}
+	}
+	TAILQ_INSERT_HEAD(&ctl->events, ev,
+	    ev_timeout_pos.ev_next_with_common_timeout);
+}
+
+static void
+event_queue_insert_inserted(struct event_base *base, struct event *ev)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+
+	if (EVUTIL_FAILURE_CHECK(ev->ev_flags & EVLIST_INSERTED)) {
+		event_errx(1, "%s: %p(fd "EV_SOCK_FMT") already inserted", __func__,
+		    ev, EV_SOCK_ARG(ev->ev_fd));
+		return;
+	}
+
+	INCR_EVENT_COUNT(base, ev->ev_flags);
+
+	ev->ev_flags |= EVLIST_INSERTED;
+}
+
+static void
+event_queue_insert_active(struct event_base *base, struct event_callback *evcb)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+
+	if (evcb->evcb_flags & EVLIST_ACTIVE) {
+		/* Double insertion is possible for active events */
+		return;
+	}
+
+	INCR_EVENT_COUNT(base, evcb->evcb_flags);
+
+	evcb->evcb_flags |= EVLIST_ACTIVE;
+
+	base->event_count_active++;
+	MAX_EVENT_COUNT(base->event_count_active_max, base->event_count_active);
+	EVUTIL_ASSERT(evcb->evcb_pri < base->nactivequeues);
+	TAILQ_INSERT_TAIL(&base->activequeues[evcb->evcb_pri],
+	    evcb, evcb_active_next);
+}
+
+static void
+event_queue_insert_active_later(struct event_base *base, struct event_callback *evcb)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+	if (evcb->evcb_flags & (EVLIST_ACTIVE_LATER|EVLIST_ACTIVE)) {
+		/* Double insertion is possible */
+		return;
+	}
+
+	INCR_EVENT_COUNT(base, evcb->evcb_flags);
+	evcb->evcb_flags |= EVLIST_ACTIVE_LATER;
+	base->event_count_active++;
+	MAX_EVENT_COUNT(base->event_count_active_max, base->event_count_active);
+	EVUTIL_ASSERT(evcb->evcb_pri < base->nactivequeues);
+	TAILQ_INSERT_TAIL(&base->active_later_queue, evcb, evcb_active_next);
+}
+
+static void
+event_queue_insert_timeout(struct event_base *base, struct event *ev)
+{
+	EVENT_BASE_ASSERT_LOCKED(base);
+
+	if (EVUTIL_FAILURE_CHECK(ev->ev_flags & EVLIST_TIMEOUT)) {
+		event_errx(1, "%s: %p(fd "EV_SOCK_FMT") already on timeout", __func__,
+		    ev, EV_SOCK_ARG(ev->ev_fd));
+		return;
+	}
+
+	INCR_EVENT_COUNT(base, ev->ev_flags);
+
+	ev->ev_flags |= EVLIST_TIMEOUT;
+
+	if (is_common_timeout(&ev->ev_timeout, base)) {
+		struct common_timeout_list *ctl =
+		    get_common_timeout_list(base, &ev->ev_timeout);
+		insert_common_timeout_inorder(ctl, ev);
+	} else {
+		min_heap_push_(&base->timeheap, ev);
+	}
+}
+
+static void
+event_queue_make_later_events_active(struct event_base *base)
+{
+	struct event_callback *evcb;
+	EVENT_BASE_ASSERT_LOCKED(base);
+
+	while ((evcb = TAILQ_FIRST(&base->active_later_queue))) {
+		TAILQ_REMOVE(&base->active_later_queue, evcb, evcb_active_next);
+		evcb->evcb_flags = (evcb->evcb_flags & ~EVLIST_ACTIVE_LATER) | EVLIST_ACTIVE;
+		EVUTIL_ASSERT(evcb->evcb_pri < base->nactivequeues);
+		TAILQ_INSERT_TAIL(&base->activequeues[evcb->evcb_pri], evcb, evcb_active_next);
+		base->n_deferreds_queued += (evcb->evcb_closure == EV_CLOSURE_CB_SELF);
+	}
+}
+
+/* Functions for debugging */
+
+const char *
+event_get_version(void)
+{
+	return (EVENT__VERSION);
+}
+
+ev_uint32_t
+event_get_version_number(void)
+{
+	return (EVENT__NUMERIC_VERSION);
+}
+
+/*
+ * No thread-safe interface needed - the information should be the same
+ * for all threads.
+ */
+
+const char *
+event_get_method(void)
+{
+	return (current_base->evsel->name);
+}
+
+#ifndef EVENT__DISABLE_MM_REPLACEMENT
+static void *(*mm_malloc_fn_)(size_t sz) = NULL;
+static void *(*mm_realloc_fn_)(void *p, size_t sz) = NULL;
+static void (*mm_free_fn_)(void *p) = NULL;
+
+void *
+event_mm_malloc_(size_t sz)
+{
+	if (sz == 0)
+		return NULL;
+
+	if (mm_malloc_fn_)
+		return mm_malloc_fn_(sz);
+	else
+		return malloc(sz);
+}
+
+void *
+event_mm_calloc_(size_t count, size_t size)
+{
+	if (count == 0 || size == 0)
+		return NULL;
+
+	if (mm_malloc_fn_) {
+		size_t sz = count * size;
+		void *p = NULL;
+		if (count > EV_SIZE_MAX / size)
+			goto error;
+		p = mm_malloc_fn_(sz);
+		if (p)
+			return memset(p, 0, sz);
+	} else {
+		void *p = calloc(count, size);
+#ifdef _WIN32
+		/* Windows calloc doesn't reliably set ENOMEM */
+		if (p == NULL)
+			goto error;
+#endif
+		return p;
+	}
+
+error:
+	errno = ENOMEM;
+	return NULL;
+}
+
+char *
+event_mm_strdup_(const char *str)
+{
+	if (!str) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if (mm_malloc_fn_) {
+		size_t ln = strlen(str);
+		void *p = NULL;
+		if (ln == EV_SIZE_MAX)
+			goto error;
+		p = mm_malloc_fn_(ln+1);
+		if (p)
+			return memcpy(p, str, ln+1);
+	} else
+#ifdef _WIN32
+		return _strdup(str);
+#else
+		return strdup(str);
+#endif
+
+error:
+	errno = ENOMEM;
+	return NULL;
+}
+
+void *
+event_mm_realloc_(void *ptr, size_t sz)
+{
+	if (mm_realloc_fn_)
+		return mm_realloc_fn_(ptr, sz);
+	else
+		return realloc(ptr, sz);
+}
+
+void
+event_mm_free_(void *ptr)
+{
+	if (mm_free_fn_)
+		mm_free_fn_(ptr);
+	else
+		free(ptr);
+}
+
+void
+event_set_mem_functions(void *(*malloc_fn)(size_t sz),
+			void *(*realloc_fn)(void *ptr, size_t sz),
+			void (*free_fn)(void *ptr))
+{
+	mm_malloc_fn_ = malloc_fn;
+	mm_realloc_fn_ = realloc_fn;
+	mm_free_fn_ = free_fn;
+}
+#endif
+
+#ifdef EVENT__HAVE_EVENTFD
+static void
+evthread_notify_drain_eventfd(evutil_socket_t fd, short what, void *arg)
+{
+	ev_uint64_t msg;
+	ev_ssize_t r;
+	struct event_base *base = arg;
+
+	r = read(fd, (void*) &msg, sizeof(msg));
+	if (r<0 && errno != EAGAIN) {
+		event_sock_warn(fd, "Error reading from eventfd");
+	}
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	base->is_notify_pending = 0;
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+#endif
+
+static void
+evthread_notify_drain_default(evutil_socket_t fd, short what, void *arg)
+{
+	unsigned char buf[1024];
+	struct event_base *base = arg;
+#ifdef _WIN32
+	while (recv(fd, (char*)buf, sizeof(buf), 0) > 0)
+		;
+#else
+	while (read(fd, (char*)buf, sizeof(buf)) > 0)
+		;
+#endif
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	base->is_notify_pending = 0;
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+int
+evthread_make_base_notifiable(struct event_base *base)
+{
+	int r;
+	if (!base)
+		return -1;
+
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	r = evthread_make_base_notifiable_nolock_(base);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return r;
+}
+
+static int
+evthread_make_base_notifiable_nolock_(struct event_base *base)
+{
+	void (*cb)(evutil_socket_t, short, void *);
+	int (*notify)(struct event_base *);
+
+	if (base->th_notify_fn != NULL) {
+		/* The base is already notifiable: we're doing fine. */
+		return 0;
+	}
+
+#if defined(EVENT__HAVE_WORKING_KQUEUE)
+	if (base->evsel == &kqops && event_kq_add_notify_event_(base) == 0) {
+		base->th_notify_fn = event_kq_notify_base_;
+		/* No need to add an event here; the backend can wake
+		 * itself up just fine. */
+		return 0;
+	}
+#endif
+
+#ifdef EVENT__HAVE_EVENTFD
+	base->th_notify_fd[0] = evutil_eventfd_(0,
+	    EVUTIL_EFD_CLOEXEC|EVUTIL_EFD_NONBLOCK);
+	if (base->th_notify_fd[0] >= 0) {
+		base->th_notify_fd[1] = -1;
+		notify = evthread_notify_base_eventfd;
+		cb = evthread_notify_drain_eventfd;
+	} else
+#endif
+	if (evutil_make_internal_pipe_(base->th_notify_fd) == 0) {
+		notify = evthread_notify_base_default;
+		cb = evthread_notify_drain_default;
+	} else {
+		return -1;
+	}
+
+	base->th_notify_fn = notify;
+
+	/* prepare an event that we can use for wakeup */
+	event_assign(&base->th_notify, base, base->th_notify_fd[0],
+				 EV_READ|EV_PERSIST, cb, base);
+
+	/* we need to mark this as internal event */
+	base->th_notify.ev_flags |= EVLIST_INTERNAL;
+	event_priority_set(&base->th_notify, 0);
+
+	return event_add_nolock_(&base->th_notify, NULL, 0);
+}
+
+int
+event_base_foreach_event_nolock_(struct event_base *base,
+    event_base_foreach_event_cb fn, void *arg)
+{
+	int r, i;
+	unsigned u;
+	struct event *ev;
+
+	/* Start out with all the EVLIST_INSERTED events. */
+	if ((r = evmap_foreach_event_(base, fn, arg)))
+		return r;
+
+	/* Okay, now we deal with those events that have timeouts and are in
+	 * the min-heap. */
+	for (u = 0; u < base->timeheap.n; ++u) {
+		ev = base->timeheap.p[u];
+		if (ev->ev_flags & EVLIST_INSERTED) {
+			/* we already processed this one */
+			continue;
+		}
+		if ((r = fn(base, ev, arg)))
+			return r;
+	}
+
+	/* Now for the events in one of the timeout queues.
+	 * the min-heap. */
+	for (i = 0; i < base->n_common_timeouts; ++i) {
+		struct common_timeout_list *ctl =
+		    base->common_timeout_queues[i];
+		TAILQ_FOREACH(ev, &ctl->events,
+		    ev_timeout_pos.ev_next_with_common_timeout) {
+			if (ev->ev_flags & EVLIST_INSERTED) {
+				/* we already processed this one */
+				continue;
+			}
+			if ((r = fn(base, ev, arg)))
+				return r;
+		}
+	}
+
+	/* Finally, we deal wit all the active events that we haven't touched
+	 * yet. */
+	for (i = 0; i < base->nactivequeues; ++i) {
+		struct event_callback *evcb;
+		TAILQ_FOREACH(evcb, &base->activequeues[i], evcb_active_next) {
+			if ((evcb->evcb_flags & (EVLIST_INIT|EVLIST_INSERTED|EVLIST_TIMEOUT)) != EVLIST_INIT) {
+				/* This isn't an event (evlist_init clear), or
+				 * we already processed it. (inserted or
+				 * timeout set */
+				continue;
+			}
+			ev = event_callback_to_event(evcb);
+			if ((r = fn(base, ev, arg)))
+				return r;
+		}
+	}
+
+	return 0;
+}
+
+/* Helper for event_base_dump_events: called on each event in the event base;
+ * dumps only the inserted events. */
+static int
+dump_inserted_event_fn(const struct event_base *base, const struct event *e, void *arg)
+{
+	FILE *output = arg;
+	const char *gloss = (e->ev_events & EV_SIGNAL) ?
+	    "sig" : "fd ";
+
+	if (! (e->ev_flags & (EVLIST_INSERTED|EVLIST_TIMEOUT)))
+		return 0;
+
+	fprintf(output, "  %p [%s "EV_SOCK_FMT"]%s%s%s%s%s%s%s",
+	    (void*)e, gloss, EV_SOCK_ARG(e->ev_fd),
+	    (e->ev_events&EV_READ)?" Read":"",
+	    (e->ev_events&EV_WRITE)?" Write":"",
+	    (e->ev_events&EV_CLOSED)?" EOF":"",
+	    (e->ev_events&EV_SIGNAL)?" Signal":"",
+	    (e->ev_events&EV_PERSIST)?" Persist":"",
+	    (e->ev_events&EV_ET)?" ET":"",
+	    (e->ev_flags&EVLIST_INTERNAL)?" Internal":"");
+	if (e->ev_flags & EVLIST_TIMEOUT) {
+		struct timeval tv;
+		tv.tv_sec = e->ev_timeout.tv_sec;
+		tv.tv_usec = e->ev_timeout.tv_usec & MICROSECONDS_MASK;
+		evutil_timeradd(&tv, &base->tv_clock_diff, &tv);
+		fprintf(output, " Timeout=%ld.%06d",
+		    (long)tv.tv_sec, (int)(tv.tv_usec & MICROSECONDS_MASK));
+	}
+	fputc('\n', output);
+
+	return 0;
+}
+
+/* Helper for event_base_dump_events: called on each event in the event base;
+ * dumps only the active events. */
+static int
+dump_active_event_fn(const struct event_base *base, const struct event *e, void *arg)
+{
+	FILE *output = arg;
+	const char *gloss = (e->ev_events & EV_SIGNAL) ?
+	    "sig" : "fd ";
+
+	if (! (e->ev_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER)))
+		return 0;
+
+	fprintf(output, "  %p [%s "EV_SOCK_FMT", priority=%d]%s%s%s%s%s active%s%s\n",
+	    (void*)e, gloss, EV_SOCK_ARG(e->ev_fd), e->ev_pri,
+	    (e->ev_res&EV_READ)?" Read":"",
+	    (e->ev_res&EV_WRITE)?" Write":"",
+	    (e->ev_res&EV_CLOSED)?" EOF":"",
+	    (e->ev_res&EV_SIGNAL)?" Signal":"",
+	    (e->ev_res&EV_TIMEOUT)?" Timeout":"",
+	    (e->ev_flags&EVLIST_INTERNAL)?" [Internal]":"",
+	    (e->ev_flags&EVLIST_ACTIVE_LATER)?" [NextTime]":"");
+
+	return 0;
+}
+
+int
+event_base_foreach_event(struct event_base *base,
+    event_base_foreach_event_cb fn, void *arg)
+{
+	int r;
+	if ((!fn) || (!base)) {
+		return -1;
+	}
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	r = event_base_foreach_event_nolock_(base, fn, arg);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+	return r;
+}
+
+
+void
+event_base_dump_events(struct event_base *base, FILE *output)
+{
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	fprintf(output, "Inserted events:\n");
+	event_base_foreach_event_nolock_(base, dump_inserted_event_fn, output);
+
+	fprintf(output, "Active events:\n");
+	event_base_foreach_event_nolock_(base, dump_active_event_fn, output);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+void
+event_base_active_by_fd(struct event_base *base, evutil_socket_t fd, short events)
+{
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+	/* Activate any non timer events */
+	if (!(events & EV_TIMEOUT)) {
+		evmap_io_active_(base, fd, events & (EV_READ|EV_WRITE|EV_CLOSED));
+	} else {
+		/* If we want to activate timer events, loop and activate each event with
+		 * the same fd in both the timeheap and common timeouts list */
+		int i;
+		unsigned u;
+		struct event *ev;
+
+		for (u = 0; u < base->timeheap.n; ++u) {
+			ev = base->timeheap.p[u];
+			if (ev->ev_fd == fd) {
+				event_active_nolock_(ev, EV_TIMEOUT, 1);
+			}
+		}
+
+		for (i = 0; i < base->n_common_timeouts; ++i) {
+			struct common_timeout_list *ctl = base->common_timeout_queues[i];
+			TAILQ_FOREACH(ev, &ctl->events,
+				ev_timeout_pos.ev_next_with_common_timeout) {
+				if (ev->ev_fd == fd) {
+					event_active_nolock_(ev, EV_TIMEOUT, 1);
+				}
+			}
+		}
+	}
+
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+void
+event_base_active_by_signal(struct event_base *base, int sig)
+{
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	evmap_signal_active_(base, sig, 1);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+
+void
+event_base_add_virtual_(struct event_base *base)
+{
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	base->virtual_event_count++;
+	MAX_EVENT_COUNT(base->virtual_event_count_max, base->virtual_event_count);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+void
+event_base_del_virtual_(struct event_base *base)
+{
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	EVUTIL_ASSERT(base->virtual_event_count > 0);
+	base->virtual_event_count--;
+	if (base->virtual_event_count == 0 && EVBASE_NEED_NOTIFY(base))
+		evthread_notify_base(base);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+static void
+event_free_debug_globals_locks(void)
+{
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+#ifndef EVENT__DISABLE_DEBUG_MODE
+	if (event_debug_map_lock_ != NULL) {
+		EVTHREAD_FREE_LOCK(event_debug_map_lock_, 0);
+		event_debug_map_lock_ = NULL;
+		evthreadimpl_disable_lock_debugging_();
+	}
+#endif /* EVENT__DISABLE_DEBUG_MODE */
+#endif /* EVENT__DISABLE_THREAD_SUPPORT */
+	return;
+}
+
+static void
+event_free_debug_globals(void)
+{
+	event_free_debug_globals_locks();
+}
+
+static void
+event_free_evsig_globals(void)
+{
+	evsig_free_globals_();
+}
+
+static void
+event_free_evutil_globals(void)
+{
+	evutil_free_globals_();
+}
+
+static void
+event_free_globals(void)
+{
+	event_free_debug_globals();
+	event_free_evsig_globals();
+	event_free_evutil_globals();
+}
+
+void
+libevent_global_shutdown(void)
+{
+	event_disable_debug_mode();
+	event_free_globals();
+}
+
+#ifndef EVENT__DISABLE_THREAD_SUPPORT
+int
+event_global_setup_locks_(const int enable_locks)
+{
+#ifndef EVENT__DISABLE_DEBUG_MODE
+	EVTHREAD_SETUP_GLOBAL_LOCK(event_debug_map_lock_, 0);
+#endif
+	if (evsig_global_setup_locks_(enable_locks) < 0)
+		return -1;
+	if (evutil_global_setup_locks_(enable_locks) < 0)
+		return -1;
+	if (evutil_secure_rng_global_setup_locks_(enable_locks) < 0)
+		return -1;
+	return 0;
+}
+#endif
+
+void
+event_base_assert_ok_(struct event_base *base)
+{
+	EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+	event_base_assert_ok_nolock_(base);
+	EVBASE_RELEASE_LOCK(base, th_base_lock);
+}
+
+void
+event_base_assert_ok_nolock_(struct event_base *base)
+{
+	int i;
+	int count;
+
+	/* First do checks on the per-fd and per-signal lists */
+	evmap_check_integrity_(base);
+
+	/* Check the heap property */
+	for (i = 1; i < (int)base->timeheap.n; ++i) {
+		int parent = (i - 1) / 2;
+		struct event *ev, *p_ev;
+		ev = base->timeheap.p[i];
+		p_ev = base->timeheap.p[parent];
+		EVUTIL_ASSERT(ev->ev_flags & EVLIST_TIMEOUT);
+		EVUTIL_ASSERT(evutil_timercmp(&p_ev->ev_timeout, &ev->ev_timeout, <=));
+		EVUTIL_ASSERT(ev->ev_timeout_pos.min_heap_idx == i);
+	}
+
+	/* Check that the common timeouts are fine */
+	for (i = 0; i < base->n_common_timeouts; ++i) {
+		struct common_timeout_list *ctl = base->common_timeout_queues[i];
+		struct event *last=NULL, *ev;
+
+		EVUTIL_ASSERT_TAILQ_OK(&ctl->events, event, ev_timeout_pos.ev_next_with_common_timeout);
+
+		TAILQ_FOREACH(ev, &ctl->events, ev_timeout_pos.ev_next_with_common_timeout) {
+			if (last)
+				EVUTIL_ASSERT(evutil_timercmp(&last->ev_timeout, &ev->ev_timeout, <=));
+			EVUTIL_ASSERT(ev->ev_flags & EVLIST_TIMEOUT);
+			EVUTIL_ASSERT(is_common_timeout(&ev->ev_timeout,base));
+			EVUTIL_ASSERT(COMMON_TIMEOUT_IDX(&ev->ev_timeout) == i);
+			last = ev;
+		}
+	}
+
+	/* Check the active queues. */
+	count = 0;
+	for (i = 0; i < base->nactivequeues; ++i) {
+		struct event_callback *evcb;
+		EVUTIL_ASSERT_TAILQ_OK(&base->activequeues[i], event_callback, evcb_active_next);
+		TAILQ_FOREACH(evcb, &base->activequeues[i], evcb_active_next) {
+			EVUTIL_ASSERT((evcb->evcb_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER)) == EVLIST_ACTIVE);
+			EVUTIL_ASSERT(evcb->evcb_pri == i);
+			++count;
+		}
+	}
+
+	{
+		struct event_callback *evcb;
+		TAILQ_FOREACH(evcb, &base->active_later_queue, evcb_active_next) {
+			EVUTIL_ASSERT((evcb->evcb_flags & (EVLIST_ACTIVE|EVLIST_ACTIVE_LATER)) == EVLIST_ACTIVE_LATER);
+			++count;
+		}
+	}
+	EVUTIL_ASSERT(count == base->event_count_active);
+}