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/*
* Copyright (c) 2015, Aleksey Demakov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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 "pthread_barrier.h"
#include <errno.h>
#ifdef __APPLE__
#define __unused __attribute__((unused))
int
pthread_barrierattr_init(pthread_barrierattr_t *attr __unused)
{
return 0;
}
int
pthread_barrierattr_destroy(pthread_barrierattr_t *attr __unused)
{
return 0;
}
int
pthread_barrierattr_getpshared(const pthread_barrierattr_t *attr __unused,
int * pshared)
{
*pshared = PTHREAD_PROCESS_PRIVATE;
return 0;
}
int
pthread_barrierattr_setpshared(pthread_barrierattr_t *attr __unused,
int pshared)
{
if (pshared != PTHREAD_PROCESS_PRIVATE) {
errno = EINVAL;
return -1;
}
return 0;
}
int
pthread_barrier_init(pthread_barrier_t * barrier,
const pthread_barrierattr_t * attr __unused,
unsigned count)
{
if (count == 0) {
errno = EINVAL;
return -1;
}
if (pthread_mutex_init(&barrier->mutex, 0) < 0) {
return -1;
}
if (pthread_cond_init(&barrier->cond, 0) < 0) {
int errno_save = errno;
pthread_mutex_destroy(&barrier->mutex);
errno = errno_save;
return -1;
}
barrier->limit = count;
barrier->count = 0;
barrier->phase = 0;
return 0;
}
int
pthread_barrier_destroy(pthread_barrier_t *barrier)
{
pthread_mutex_destroy(&barrier->mutex);
pthread_cond_destroy(&barrier->cond);
return 0;
}
int
pthread_barrier_wait(pthread_barrier_t *barrier)
{
pthread_mutex_lock(&barrier->mutex);
barrier->count++;
if (barrier->count >= barrier->limit) {
barrier->phase++;
barrier->count = 0;
pthread_cond_broadcast(&barrier->cond);
pthread_mutex_unlock(&barrier->mutex);
return PTHREAD_BARRIER_SERIAL_THREAD;
} else {
unsigned phase = barrier->phase;
do
pthread_cond_wait(&barrier->cond, &barrier->mutex);
while (phase == barrier->phase);
pthread_mutex_unlock(&barrier->mutex);
return 0;
}
}
#endif /* __APPLE__ */
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