mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-13 02:34:54 +00:00
185 lines
5.0 KiB
C
185 lines
5.0 KiB
C
/*
|
|
* Copyright (c) 2014 Nicolas George
|
|
*
|
|
* 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 "fifo.h"
|
|
#include "threadmessage.h"
|
|
#if HAVE_THREADS
|
|
#if HAVE_PTHREADS
|
|
#include <pthread.h>
|
|
#elif HAVE_W32THREADS
|
|
#include "compat/w32pthreads.h"
|
|
#elif HAVE_OS2THREADS
|
|
#include "compat/os2threads.h"
|
|
#else
|
|
#error "Unknown threads implementation"
|
|
#endif
|
|
#endif
|
|
|
|
struct AVThreadMessageQueue {
|
|
#if HAVE_THREADS
|
|
AVFifoBuffer *fifo;
|
|
pthread_mutex_t lock;
|
|
pthread_cond_t cond;
|
|
int err_send;
|
|
int err_recv;
|
|
unsigned elsize;
|
|
#else
|
|
int dummy;
|
|
#endif
|
|
};
|
|
|
|
int av_thread_message_queue_alloc(AVThreadMessageQueue **mq,
|
|
unsigned nelem,
|
|
unsigned elsize)
|
|
{
|
|
#if HAVE_THREADS
|
|
AVThreadMessageQueue *rmq;
|
|
int ret = 0;
|
|
|
|
if (nelem > INT_MAX / elsize)
|
|
return AVERROR(EINVAL);
|
|
if (!(rmq = av_mallocz(sizeof(*rmq))))
|
|
return AVERROR(ENOMEM);
|
|
if ((ret = pthread_mutex_init(&rmq->lock, NULL))) {
|
|
av_free(rmq);
|
|
return AVERROR(ret);
|
|
}
|
|
if ((ret = pthread_cond_init(&rmq->cond, NULL))) {
|
|
pthread_mutex_destroy(&rmq->lock);
|
|
av_free(rmq);
|
|
return AVERROR(ret);
|
|
}
|
|
if (!(rmq->fifo = av_fifo_alloc(elsize * nelem))) {
|
|
pthread_cond_destroy(&rmq->cond);
|
|
pthread_mutex_destroy(&rmq->lock);
|
|
av_free(rmq);
|
|
return AVERROR(ret);
|
|
}
|
|
rmq->elsize = elsize;
|
|
*mq = rmq;
|
|
return 0;
|
|
#else
|
|
*mq = NULL;
|
|
return AVERROR(ENOSYS);
|
|
#endif /* HAVE_THREADS */
|
|
}
|
|
|
|
void av_thread_message_queue_free(AVThreadMessageQueue **mq)
|
|
{
|
|
#if HAVE_THREADS
|
|
if (*mq) {
|
|
av_fifo_freep(&(*mq)->fifo);
|
|
pthread_cond_destroy(&(*mq)->cond);
|
|
pthread_mutex_destroy(&(*mq)->lock);
|
|
av_freep(mq);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#if HAVE_THREADS
|
|
|
|
static int av_thread_message_queue_send_locked(AVThreadMessageQueue *mq,
|
|
void *msg,
|
|
unsigned flags)
|
|
{
|
|
while (!mq->err_send && av_fifo_space(mq->fifo) < mq->elsize) {
|
|
if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
|
|
return AVERROR(EAGAIN);
|
|
pthread_cond_wait(&mq->cond, &mq->lock);
|
|
}
|
|
if (mq->err_send)
|
|
return mq->err_send;
|
|
av_fifo_generic_write(mq->fifo, msg, mq->elsize, NULL);
|
|
pthread_cond_signal(&mq->cond);
|
|
return 0;
|
|
}
|
|
|
|
static int av_thread_message_queue_recv_locked(AVThreadMessageQueue *mq,
|
|
void *msg,
|
|
unsigned flags)
|
|
{
|
|
while (!mq->err_recv && av_fifo_size(mq->fifo) < mq->elsize) {
|
|
if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
|
|
return AVERROR(EAGAIN);
|
|
pthread_cond_wait(&mq->cond, &mq->lock);
|
|
}
|
|
if (av_fifo_size(mq->fifo) < mq->elsize)
|
|
return mq->err_recv;
|
|
av_fifo_generic_read(mq->fifo, msg, mq->elsize, NULL);
|
|
pthread_cond_signal(&mq->cond);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* HAVE_THREADS */
|
|
|
|
int av_thread_message_queue_send(AVThreadMessageQueue *mq,
|
|
void *msg,
|
|
unsigned flags)
|
|
{
|
|
#if HAVE_THREADS
|
|
int ret;
|
|
|
|
pthread_mutex_lock(&mq->lock);
|
|
ret = av_thread_message_queue_send_locked(mq, msg, flags);
|
|
pthread_mutex_unlock(&mq->lock);
|
|
return ret;
|
|
#else
|
|
return AVERROR(ENOSYS);
|
|
#endif /* HAVE_THREADS */
|
|
}
|
|
|
|
int av_thread_message_queue_recv(AVThreadMessageQueue *mq,
|
|
void *msg,
|
|
unsigned flags)
|
|
{
|
|
#if HAVE_THREADS
|
|
int ret;
|
|
|
|
pthread_mutex_lock(&mq->lock);
|
|
ret = av_thread_message_queue_recv_locked(mq, msg, flags);
|
|
pthread_mutex_unlock(&mq->lock);
|
|
return ret;
|
|
#else
|
|
return AVERROR(ENOSYS);
|
|
#endif /* HAVE_THREADS */
|
|
}
|
|
|
|
void av_thread_message_queue_set_err_send(AVThreadMessageQueue *mq,
|
|
int err)
|
|
{
|
|
#if HAVE_THREADS
|
|
pthread_mutex_lock(&mq->lock);
|
|
mq->err_send = err;
|
|
pthread_cond_broadcast(&mq->cond);
|
|
pthread_mutex_unlock(&mq->lock);
|
|
#endif /* HAVE_THREADS */
|
|
}
|
|
|
|
void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq,
|
|
int err)
|
|
{
|
|
#if HAVE_THREADS
|
|
pthread_mutex_lock(&mq->lock);
|
|
mq->err_recv = err;
|
|
pthread_cond_broadcast(&mq->cond);
|
|
pthread_mutex_unlock(&mq->lock);
|
|
#endif /* HAVE_THREADS */
|
|
}
|