michael@0: /*
michael@0:  * Copyright 2009-2012 Niels Provos and Nick Mathewson
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  * 3. The name of the author may not be used to endorse or promote products
michael@0:  *    derived from this software without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
michael@0:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
michael@0:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
michael@0:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
michael@0:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
michael@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
michael@0:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
michael@0:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
michael@0:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0:  */
michael@0: #include "event2/event-config.h"
michael@0: 
michael@0: /* With glibc we need to define this to get PTHREAD_MUTEX_RECURSIVE. */
michael@0: #define _GNU_SOURCE
michael@0: #include <pthread.h>
michael@0: 
michael@0: struct event_base;
michael@0: #include "event2/thread.h"
michael@0: 
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #include "mm-internal.h"
michael@0: #include "evthread-internal.h"
michael@0: 
michael@0: static pthread_mutexattr_t attr_recursive;
michael@0: 
michael@0: static void *
michael@0: evthread_posix_lock_alloc(unsigned locktype)
michael@0: {
michael@0: 	pthread_mutexattr_t *attr = NULL;
michael@0: 	pthread_mutex_t *lock = mm_malloc(sizeof(pthread_mutex_t));
michael@0: 	if (!lock)
michael@0: 		return NULL;
michael@0: 	if (locktype & EVTHREAD_LOCKTYPE_RECURSIVE)
michael@0: 		attr = &attr_recursive;
michael@0: 	if (pthread_mutex_init(lock, attr)) {
michael@0: 		mm_free(lock);
michael@0: 		return NULL;
michael@0: 	}
michael@0: 	return lock;
michael@0: }
michael@0: 
michael@0: static void
michael@0: evthread_posix_lock_free(void *_lock, unsigned locktype)
michael@0: {
michael@0: 	pthread_mutex_t *lock = _lock;
michael@0: 	pthread_mutex_destroy(lock);
michael@0: 	mm_free(lock);
michael@0: }
michael@0: 
michael@0: static int
michael@0: evthread_posix_lock(unsigned mode, void *_lock)
michael@0: {
michael@0: 	pthread_mutex_t *lock = _lock;
michael@0: 	if (mode & EVTHREAD_TRY)
michael@0: 		return pthread_mutex_trylock(lock);
michael@0: 	else
michael@0: 		return pthread_mutex_lock(lock);
michael@0: }
michael@0: 
michael@0: static int
michael@0: evthread_posix_unlock(unsigned mode, void *_lock)
michael@0: {
michael@0: 	pthread_mutex_t *lock = _lock;
michael@0: 	return pthread_mutex_unlock(lock);
michael@0: }
michael@0: 
michael@0: static unsigned long
michael@0: evthread_posix_get_id(void)
michael@0: {
michael@0: 	union {
michael@0: 		pthread_t thr;
michael@0: #if _EVENT_SIZEOF_PTHREAD_T > _EVENT_SIZEOF_LONG
michael@0: 		ev_uint64_t id;
michael@0: #else
michael@0: 		unsigned long id;
michael@0: #endif
michael@0: 	} r;
michael@0: #if _EVENT_SIZEOF_PTHREAD_T < _EVENT_SIZEOF_LONG
michael@0: 	memset(&r, 0, sizeof(r));
michael@0: #endif
michael@0: 	r.thr = pthread_self();
michael@0: 	return (unsigned long)r.id;
michael@0: }
michael@0: 
michael@0: static void *
michael@0: evthread_posix_cond_alloc(unsigned condflags)
michael@0: {
michael@0: 	pthread_cond_t *cond = mm_malloc(sizeof(pthread_cond_t));
michael@0: 	if (!cond)
michael@0: 		return NULL;
michael@0: 	if (pthread_cond_init(cond, NULL)) {
michael@0: 		mm_free(cond);
michael@0: 		return NULL;
michael@0: 	}
michael@0: 	return cond;
michael@0: }
michael@0: 
michael@0: static void
michael@0: evthread_posix_cond_free(void *_cond)
michael@0: {
michael@0: 	pthread_cond_t *cond = _cond;
michael@0: 	pthread_cond_destroy(cond);
michael@0: 	mm_free(cond);
michael@0: }
michael@0: 
michael@0: static int
michael@0: evthread_posix_cond_signal(void *_cond, int broadcast)
michael@0: {
michael@0: 	pthread_cond_t *cond = _cond;
michael@0: 	int r;
michael@0: 	if (broadcast)
michael@0: 		r = pthread_cond_broadcast(cond);
michael@0: 	else
michael@0: 		r = pthread_cond_signal(cond);
michael@0: 	return r ? -1 : 0;
michael@0: }
michael@0: 
michael@0: static int
michael@0: evthread_posix_cond_wait(void *_cond, void *_lock, const struct timeval *tv)
michael@0: {
michael@0: 	int r;
michael@0: 	pthread_cond_t *cond = _cond;
michael@0: 	pthread_mutex_t *lock = _lock;
michael@0: 
michael@0: 	if (tv) {
michael@0: 		struct timeval now, abstime;
michael@0: 		struct timespec ts;
michael@0: 		evutil_gettimeofday(&now, NULL);
michael@0: 		evutil_timeradd(&now, tv, &abstime);
michael@0: 		ts.tv_sec = abstime.tv_sec;
michael@0: 		ts.tv_nsec = abstime.tv_usec*1000;
michael@0: 		r = pthread_cond_timedwait(cond, lock, &ts);
michael@0: 		if (r == ETIMEDOUT)
michael@0: 			return 1;
michael@0: 		else if (r)
michael@0: 			return -1;
michael@0: 		else
michael@0: 			return 0;
michael@0: 	} else {
michael@0: 		r = pthread_cond_wait(cond, lock);
michael@0: 		return r ? -1 : 0;
michael@0: 	}
michael@0: }
michael@0: 
michael@0: int
michael@0: evthread_use_pthreads(void)
michael@0: {
michael@0: 	struct evthread_lock_callbacks cbs = {
michael@0: 		EVTHREAD_LOCK_API_VERSION,
michael@0: 		EVTHREAD_LOCKTYPE_RECURSIVE,
michael@0: 		evthread_posix_lock_alloc,
michael@0: 		evthread_posix_lock_free,
michael@0: 		evthread_posix_lock,
michael@0: 		evthread_posix_unlock
michael@0: 	};
michael@0: 	struct evthread_condition_callbacks cond_cbs = {
michael@0: 		EVTHREAD_CONDITION_API_VERSION,
michael@0: 		evthread_posix_cond_alloc,
michael@0: 		evthread_posix_cond_free,
michael@0: 		evthread_posix_cond_signal,
michael@0: 		evthread_posix_cond_wait
michael@0: 	};
michael@0: 	/* Set ourselves up to get recursive locks. */
michael@0: 	if (pthread_mutexattr_init(&attr_recursive))
michael@0: 		return -1;
michael@0: 	if (pthread_mutexattr_settype(&attr_recursive, PTHREAD_MUTEX_RECURSIVE))
michael@0: 		return -1;
michael@0: 
michael@0: 	evthread_set_lock_callbacks(&cbs);
michael@0: 	evthread_set_condition_callbacks(&cond_cbs);
michael@0: 	evthread_set_id_callback(evthread_posix_get_id);
michael@0: 	return 0;
michael@0: }