| /* |
| * 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" |
| #include "thread.h" |
| |
| struct AVThreadMessageQueue { |
| #if HAVE_THREADS |
| AVFifoBuffer *fifo; |
| pthread_mutex_t lock; |
| pthread_cond_t cond_recv; |
| pthread_cond_t cond_send; |
| int err_send; |
| int err_recv; |
| unsigned elsize; |
| void (*free_func)(void *msg); |
| #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_recv, NULL))) { |
| pthread_mutex_destroy(&rmq->lock); |
| av_free(rmq); |
| return AVERROR(ret); |
| } |
| if ((ret = pthread_cond_init(&rmq->cond_send, NULL))) { |
| pthread_cond_destroy(&rmq->cond_recv); |
| pthread_mutex_destroy(&rmq->lock); |
| av_free(rmq); |
| return AVERROR(ret); |
| } |
| if (!(rmq->fifo = av_fifo_alloc(elsize * nelem))) { |
| pthread_cond_destroy(&rmq->cond_send); |
| pthread_cond_destroy(&rmq->cond_recv); |
| 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_set_free_func(AVThreadMessageQueue *mq, |
| void (*free_func)(void *msg)) |
| { |
| #if HAVE_THREADS |
| mq->free_func = free_func; |
| #endif |
| } |
| |
| void av_thread_message_queue_free(AVThreadMessageQueue **mq) |
| { |
| #if HAVE_THREADS |
| if (*mq) { |
| av_thread_message_flush(*mq); |
| av_fifo_freep(&(*mq)->fifo); |
| pthread_cond_destroy(&(*mq)->cond_send); |
| pthread_cond_destroy(&(*mq)->cond_recv); |
| 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_send, &mq->lock); |
| } |
| if (mq->err_send) |
| return mq->err_send; |
| av_fifo_generic_write(mq->fifo, msg, mq->elsize, NULL); |
| /* one message is sent, signal one receiver */ |
| pthread_cond_signal(&mq->cond_recv); |
| 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_recv, &mq->lock); |
| } |
| if (av_fifo_size(mq->fifo) < mq->elsize) |
| return mq->err_recv; |
| av_fifo_generic_read(mq->fifo, msg, mq->elsize, NULL); |
| /* one message space appeared, signal one sender */ |
| pthread_cond_signal(&mq->cond_send); |
| 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_send); |
| 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_recv); |
| pthread_mutex_unlock(&mq->lock); |
| #endif /* HAVE_THREADS */ |
| } |
| |
| #if HAVE_THREADS |
| static void free_func_wrap(void *arg, void *msg, int size) |
| { |
| AVThreadMessageQueue *mq = arg; |
| mq->free_func(msg); |
| } |
| #endif |
| |
| void av_thread_message_flush(AVThreadMessageQueue *mq) |
| { |
| #if HAVE_THREADS |
| int used, off; |
| void *free_func = mq->free_func; |
| |
| pthread_mutex_lock(&mq->lock); |
| used = av_fifo_size(mq->fifo); |
| if (free_func) |
| for (off = 0; off < used; off += mq->elsize) |
| av_fifo_generic_peek_at(mq->fifo, mq, off, mq->elsize, free_func_wrap); |
| av_fifo_drain(mq->fifo, used); |
| /* only the senders need to be notified since the queue is empty and there |
| * is nothing to read */ |
| pthread_cond_broadcast(&mq->cond_send); |
| pthread_mutex_unlock(&mq->lock); |
| #endif /* HAVE_THREADS */ |
| } |