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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"
#if HAVE_PTHREAD_CANCEL
#define DNNCond pthread_cond_t
#define dnn_cond_init pthread_cond_init
#define dnn_cond_destroy pthread_cond_destroy
#define dnn_cond_signal pthread_cond_signal
#define dnn_cond_wait pthread_cond_wait
#else
#define DNNCond char
static inline int dnn_cond_init(DNNCond *cond, const void *attr) { return 0; }
static inline int dnn_cond_destroy(DNNCond *cond) { return 0; }
static inline int dnn_cond_signal(DNNCond *cond) { return 0; }
static inline int dnn_cond_wait(DNNCond *cond, AVMutex *mutex)
{
av_assert0(!"should not reach here");
return 0;
}
#endif
struct SafeQueue {
Queue *q;
AVMutex mutex;
DNNCond cond;
};
SafeQueue *ff_safe_queue_create(void)
{
SafeQueue *sq = av_malloc(sizeof(*sq));
if (!sq)
return NULL;
sq->q = ff_queue_create();
if (!sq->q) {
av_freep(&sq);
return NULL;
}
ff_mutex_init(&sq->mutex, NULL);
dnn_cond_init(&sq->cond, NULL);
return sq;
}
void ff_safe_queue_destroy(SafeQueue *sq)
{
if (!sq)
return;
ff_queue_destroy(sq->q);
ff_mutex_destroy(&sq->mutex);
dnn_cond_destroy(&sq->cond);
av_freep(&sq);
}
size_t ff_safe_queue_size(SafeQueue *sq)
{
return sq ? ff_queue_size(sq->q) : 0;
}
int ff_safe_queue_push_front(SafeQueue *sq, void *v)
{
int ret;
ff_mutex_lock(&sq->mutex);
ret = ff_queue_push_front(sq->q, v);
dnn_cond_signal(&sq->cond);
ff_mutex_unlock(&sq->mutex);
return ret;
}
int ff_safe_queue_push_back(SafeQueue *sq, void *v)
{
int ret;
ff_mutex_lock(&sq->mutex);
ret = ff_queue_push_back(sq->q, v);
dnn_cond_signal(&sq->cond);
ff_mutex_unlock(&sq->mutex);
return ret;
}
void *ff_safe_queue_pop_front(SafeQueue *sq)
{
void *value;
ff_mutex_lock(&sq->mutex);
while (ff_queue_size(sq->q) == 0) {
dnn_cond_wait(&sq->cond, &sq->mutex);
}
value = ff_queue_pop_front(sq->q);
dnn_cond_signal(&sq->cond);
ff_mutex_unlock(&sq->mutex);
return value;
}
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