/*
* Copyright 2015 Red Hat Inc., Durham, North Carolina.
* All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Martin Preisler <mpreisle@redhat.com>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "compat_pthread_barrier.h"
#ifdef OS_APPLE
#include <errno.h>
int pthread_barrier_init(pthread_barrier_t *barrier, const pthread_barrierattr_t *attr, unsigned int 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)
{
pthread_mutex_destroy(&barrier->mutex);
return -1;
}
barrier->trip_count = count;
barrier->count = 0;
return 0;
}
int pthread_barrier_destroy(pthread_barrier_t *barrier)
{
pthread_cond_destroy(&barrier->cond);
pthread_mutex_destroy(&barrier->mutex);
return 0;
}
int pthread_barrier_wait(pthread_barrier_t *barrier)
{
pthread_mutex_lock(&barrier->mutex);
barrier->count += 1;
if (barrier->count >= barrier->trip_count)
{
barrier->count = 0;
pthread_cond_broadcast(&barrier->cond);
pthread_mutex_unlock(&barrier->mutex);
return PTHREAD_BARRIER_SERIAL_THREAD;
}
else
{
// The mutex is unlocked at this point by cond_wait, other threads
// can then lock it by entering this function.
pthread_cond_wait(&barrier->cond, &barrier->mutex);
pthread_mutex_unlock(&barrier->mutex);
return 0;
}
}
#endif