125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* File : pthread_barrier.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2010-10-26 Bernard the first version
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*/
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#include <pthread.h>
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int pthread_barrierattr_destroy(pthread_barrierattr_t *attr)
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{
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if (!attr)
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return EINVAL;
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return 0;
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}
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RTM_EXPORT(pthread_barrierattr_destroy);
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int pthread_barrierattr_init(pthread_barrierattr_t *attr)
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{
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if (!attr)
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return EINVAL;
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*attr = PTHREAD_PROCESS_PRIVATE;
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return 0;
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}
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RTM_EXPORT(pthread_barrierattr_init);
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int pthread_barrierattr_getpshared(const pthread_barrierattr_t *attr,
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int *pshared)
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{
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if (!attr)
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return EINVAL;
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*pshared = (int)*attr;
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return 0;
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}
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RTM_EXPORT(pthread_barrierattr_getpshared);
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int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr, int pshared)
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{
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if (!attr)
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return EINVAL;
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if (pshared == PTHREAD_PROCESS_PRIVATE)
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attr = PTHREAD_PROCESS_PRIVATE;
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return EINVAL;
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}
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RTM_EXPORT(pthread_barrierattr_setpshared);
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int pthread_barrier_destroy(pthread_barrier_t *barrier)
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{
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rt_err_t result;
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if (!barrier)
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return EINVAL;
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result = pthread_cond_destroy(&(barrier->cond));
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return result;
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}
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RTM_EXPORT(pthread_barrier_destroy);
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int pthread_barrier_init(pthread_barrier_t *barrier,
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const pthread_barrierattr_t *attr,
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unsigned count)
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{
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if (!barrier)
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return EINVAL;
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if (attr && (*attr != PTHREAD_PROCESS_PRIVATE))
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return EINVAL;
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barrier->count = count;
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pthread_cond_init(&(barrier->cond), NULL);
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pthread_mutex_init(&(barrier->mutex), NULL);
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return 0;
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}
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RTM_EXPORT(pthread_barrier_init);
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int pthread_barrier_wait(pthread_barrier_t *barrier)
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{
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rt_err_t result;
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if (!barrier)
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return EINVAL;
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result = pthread_mutex_lock(&(barrier->mutex));
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if (result != 0)
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return EINVAL;
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if (barrier->count == 0)
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result = EINVAL;
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else
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{
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barrier->count -= 1;
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if (barrier->count == 0) /* broadcast condition */
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pthread_cond_broadcast(&(barrier->cond));
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else
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pthread_cond_wait(&(barrier->cond), &(barrier->mutex));
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}
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pthread_mutex_unlock(&(barrier->mutex));
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return result;
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}
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RTM_EXPORT(pthread_barrier_wait);
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