mirror of
https://github.com/libevent/libevent.git
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97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* Copyright 2009 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "event-config.h"
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#endif
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/* With glibc we need to define this to get PTHREAD_MUTEX_RECURSIVE. */
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#define _GNU_SOURCE
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#include <pthread.h>
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struct event_base;
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#include <event2/thread.h>
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#include "mm-internal.h"
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static pthread_mutexattr_t attr_recursive;
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static void *
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evthread_posix_lock_create(void)
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{
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pthread_mutex_t *lock = mm_malloc(sizeof(pthread_mutex_t));
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if (!lock)
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return NULL;
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if (pthread_mutex_init(lock, &attr_recursive)) {
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mm_free(lock);
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return NULL;
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}
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return lock;
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}
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static void
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evthread_posix_lock_free(void *_lock)
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{
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pthread_mutex_t *lock = _lock;
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pthread_mutex_destroy(lock);
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mm_free(lock);
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}
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static void
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evthread_posix_lock(int mode, void *_lock)
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{
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pthread_mutex_t *lock = _lock;
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if (0 != (mode & EVTHREAD_LOCK))
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pthread_mutex_lock(lock);
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else
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pthread_mutex_unlock(lock);
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}
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static unsigned long
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evthread_posix_get_id(void)
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{
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union {
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pthread_t thr;
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unsigned long id;
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} r;
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r.thr = pthread_self();
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return r.id;
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}
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int
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evthread_use_pthreads(void)
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{
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/* Set ourselves up to get recursive locks. */
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pthread_mutexattr_init(&attr_recursive);
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pthread_mutexattr_settype(&attr_recursive, PTHREAD_MUTEX_RECURSIVE);
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evthread_set_lock_create_callbacks(
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evthread_posix_lock_create,
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evthread_posix_lock_free);
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evthread_set_locking_callback(evthread_posix_lock);
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evthread_set_id_callback(evthread_posix_get_id);
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return -1;
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}
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