mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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153 lines
3.5 KiB
C
153 lines
3.5 KiB
C
/** Wrapper around queue that uses POSIX CV's for signalling writes.
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*
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* @file
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* @author Georg Martin Reinke <georg.reinke@rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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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 3 of the License, or
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* 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include "queue_signalled.h"
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int queue_signalled_init(struct queue_signalled *qs, size_t size, struct memtype *mem)
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{
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int ret;
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pthread_condattr_t cvattr;
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pthread_mutexattr_t mtattr;
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ret = queue_init(&qs->queue, size, mem);
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if (ret < 0)
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return ret;
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pthread_mutexattr_init(&mtattr);
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pthread_condattr_init(&cvattr);
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pthread_mutexattr_setpshared(&mtattr, PTHREAD_PROCESS_SHARED);
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pthread_condattr_setpshared(&cvattr, PTHREAD_PROCESS_SHARED);
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pthread_mutex_init(&qs->mutex, &mtattr);
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pthread_cond_init(&qs->ready, &cvattr);
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pthread_mutexattr_destroy(&mtattr);
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pthread_condattr_destroy(&cvattr);
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return 0;
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}
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int queue_signalled_destroy(struct queue_signalled *qs)
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{
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int ret;
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ret = queue_destroy(&qs->queue);
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if (ret < 0)
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return ret;
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pthread_cond_destroy(&qs->ready);
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pthread_mutex_destroy(&qs->mutex);
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return 0;
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}
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int queue_signalled_push(struct queue_signalled *qs, void *ptr)
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{
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int ret;
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ret = queue_push(&qs->queue, ptr);
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if (ret < 0)
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return ret;
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pthread_mutex_lock(&qs->mutex);
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pthread_cond_broadcast(&qs->ready);
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pthread_mutex_unlock(&qs->mutex);
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return ret;
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}
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int queue_signalled_push_many(struct queue_signalled *qs, void *ptr[], size_t cnt)
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{
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int ret;
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ret = queue_push_many(&qs->queue, ptr, cnt);
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if (ret < 0)
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return ret;
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pthread_mutex_lock(&qs->mutex);
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pthread_cond_broadcast(&qs->ready);
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pthread_mutex_unlock(&qs->mutex);
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return ret;
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}
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int queue_signalled_pull(struct queue_signalled *qs, void **ptr)
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{
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int ret = 0;
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/* Make sure that qs->mutex is unlocked if this thread gets cancelled. */
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pthread_cleanup_push((void (*)(void*)) pthread_mutex_unlock, &qs->mutex);
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pthread_mutex_lock(&qs->mutex);
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while (!ret) {
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ret = queue_pull(&qs->queue, ptr);
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if (ret == -1)
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break;
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if (!ret)
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pthread_cond_wait(&qs->ready, &qs->mutex);
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}
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pthread_mutex_unlock(&qs->mutex);
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pthread_cleanup_pop(0);
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return ret;
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}
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int queue_signalled_pull_many(struct queue_signalled *qs, void *ptr[], size_t cnt)
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{
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int ret = 0;
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/* Make sure that qs->mutex is unlocked if this thread gets cancelled. */
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pthread_cleanup_push((void (*)(void*)) pthread_mutex_unlock, &qs->mutex);
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pthread_mutex_lock(&qs->mutex);
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while (!ret) {
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ret = queue_pull_many(&qs->queue, ptr, cnt);
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if (ret == -1)
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break;
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if (!ret)
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pthread_cond_wait(&qs->ready, &qs->mutex);
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}
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pthread_mutex_unlock(&qs->mutex);
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pthread_cleanup_pop(0);
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return ret;
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}
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int queue_signalled_close(struct queue_signalled *qs) {
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int ret;
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pthread_mutex_lock(&qs->mutex);
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ret = queue_close(&qs->queue);
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pthread_cond_broadcast(&qs->ready);
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pthread_mutex_unlock(&qs->mutex);
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return ret;
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}
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