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/*
* Copyright (c) 2020
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include "queue.h"
#include "safe_queue.h"
#include "libavutil/mem.h"
#include "libavutil/avassert.h"
#include "libavutil/thread.h"
typedef struct _safe_queue {
queue *q;
pthread_mutex_t mutex;
pthread_cond_t cond;
}safe_queue;
safe_queue *safe_queue_create(void)
{
safe_queue *sq = av_malloc(sizeof(*sq));
if (!sq)
return NULL;
sq->q = queue_create();
if (!sq->q)
return NULL;
pthread_mutex_init(&sq->mutex, NULL);
pthread_cond_init(&sq->cond, NULL);
return sq;
}
void safe_queue_destroy(safe_queue *sq)
{
if (!sq)
return;
queue_destroy(sq->q);
pthread_mutex_destroy(&sq->mutex);
pthread_cond_destroy(&sq->cond);
av_freep(&sq);
}
size_t safe_queue_size(safe_queue *sq)
{
return sq ? queue_size(sq->q) : 0;
}
void safe_queue_push_front(safe_queue *sq, void *v)
{
pthread_mutex_lock(&sq->mutex);
queue_push_front(sq->q, v);
pthread_cond_signal(&sq->cond);
pthread_mutex_unlock(&sq->mutex);
}
void safe_queue_push_back(safe_queue *sq, void *v)
{
pthread_mutex_lock(&sq->mutex);
queue_push_back(sq->q, v);
pthread_cond_signal(&sq->cond);
pthread_mutex_unlock(&sq->mutex);
}
void *safe_queue_pop_front(safe_queue *sq)
{
void *value;
pthread_mutex_lock(&sq->mutex);
while (queue_size(sq->q) == 0) {
pthread_cond_wait(&sq->cond, &sq->mutex);
}
value = queue_pop_front(sq->q);
pthread_cond_signal(&sq->cond);
pthread_mutex_unlock(&sq->mutex);
return value;
}
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