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/*
* Copyright 2009-2010 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 "event-config.h"
/* With glibc we need to define this to get PTHREAD_MUTEX_RECURSIVE. */
#define _GNU_SOURCE
#include <pthread.h>
struct event_base;
#include <event2/thread.h>
#include <stdlib.h>
#include "mm-internal.h"
static pthread_mutexattr_t attr_recursive;
static void *
evthread_posix_lock_alloc(unsigned locktype)
{
pthread_mutexattr_t *attr = NULL;
pthread_mutex_t *lock = mm_malloc(sizeof(pthread_mutex_t));
if (!lock)
return NULL;
if (locktype & EVTHREAD_LOCKTYPE_RECURSIVE)
attr = &attr_recursive;
if (pthread_mutex_init(lock, attr)) {
mm_free(lock);
return NULL;
}
return lock;
}
static void
evthread_posix_lock_free(void *_lock, unsigned locktype)
{
pthread_mutex_t *lock = _lock;
pthread_mutex_destroy(lock);
mm_free(lock);
}
static int
evthread_posix_lock(unsigned mode, void *_lock)
{
pthread_mutex_t *lock = _lock;
if (mode & EVTHREAD_TRY)
return pthread_mutex_trylock(lock);
else
return pthread_mutex_lock(lock);
}
static int
evthread_posix_unlock(unsigned mode, void *_lock)
{
pthread_mutex_t *lock = _lock;
return pthread_mutex_unlock(lock);
}
static unsigned long
evthread_posix_get_id(void)
{
union {
pthread_t thr;
unsigned long id;
} r;
r.thr = pthread_self();
return r.id;
}
int
evthread_use_pthreads(void)
{
struct evthread_lock_callbacks cbs = {
EVTHREAD_LOCK_API_VERSION,
EVTHREAD_LOCKTYPE_RECURSIVE,
evthread_posix_lock_alloc,
evthread_posix_lock_free,
evthread_posix_lock,
evthread_posix_unlock
};
/* Set ourselves up to get recursive locks. */
if (pthread_mutexattr_init(&attr_recursive))
return -1;
if (pthread_mutexattr_settype(&attr_recursive, PTHREAD_MUTEX_RECURSIVE))
return -1;
evthread_set_lock_callbacks(&cbs);
evthread_set_id_callback(evthread_posix_get_id);
return 0;
}
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