2 * Copyright (c) 2014 Nicolas George
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public License
8 * as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "threadmessage.h"
27 #include "compat/w32pthreads.h"
29 #include "compat/os2threads.h"
31 #error "Unknown threads implementation"
35 struct AVThreadMessageQueue
{
48 int av_thread_message_queue_alloc(AVThreadMessageQueue
**mq
,
53 AVThreadMessageQueue
*rmq
;
56 if (nelem
> INT_MAX
/ elsize
)
57 return AVERROR(EINVAL
);
58 if (!(rmq
= av_mallocz(sizeof(*rmq
))))
59 return AVERROR(ENOMEM
);
60 if ((ret
= pthread_mutex_init(&rmq
->lock
, NULL
))) {
64 if ((ret
= pthread_cond_init(&rmq
->cond
, NULL
))) {
65 pthread_mutex_destroy(&rmq
->lock
);
69 if (!(rmq
->fifo
= av_fifo_alloc(elsize
* nelem
))) {
70 pthread_cond_destroy(&rmq
->cond
);
71 pthread_mutex_destroy(&rmq
->lock
);
80 return AVERROR(ENOSYS
);
81 #endif /* HAVE_THREADS */
84 void av_thread_message_queue_free(AVThreadMessageQueue
**mq
)
88 av_fifo_freep(&(*mq
)->fifo
);
89 pthread_cond_destroy(&(*mq
)->cond
);
90 pthread_mutex_destroy(&(*mq
)->lock
);
98 static int av_thread_message_queue_send_locked(AVThreadMessageQueue
*mq
,
102 while (!mq
->err_send
&& av_fifo_space(mq
->fifo
) < mq
->elsize
) {
103 if ((flags
& AV_THREAD_MESSAGE_NONBLOCK
))
104 return AVERROR(EAGAIN
);
105 pthread_cond_wait(&mq
->cond
, &mq
->lock
);
109 av_fifo_generic_write(mq
->fifo
, msg
, mq
->elsize
, NULL
);
110 pthread_cond_signal(&mq
->cond
);
114 static int av_thread_message_queue_recv_locked(AVThreadMessageQueue
*mq
,
118 while (!mq
->err_recv
&& av_fifo_size(mq
->fifo
) < mq
->elsize
) {
119 if ((flags
& AV_THREAD_MESSAGE_NONBLOCK
))
120 return AVERROR(EAGAIN
);
121 pthread_cond_wait(&mq
->cond
, &mq
->lock
);
123 if (av_fifo_size(mq
->fifo
) < mq
->elsize
)
125 av_fifo_generic_read(mq
->fifo
, msg
, mq
->elsize
, NULL
);
126 pthread_cond_signal(&mq
->cond
);
130 #endif /* HAVE_THREADS */
132 int av_thread_message_queue_send(AVThreadMessageQueue
*mq
,
139 pthread_mutex_lock(&mq
->lock
);
140 ret
= av_thread_message_queue_send_locked(mq
, msg
, flags
);
141 pthread_mutex_unlock(&mq
->lock
);
144 return AVERROR(ENOSYS
);
145 #endif /* HAVE_THREADS */
148 int av_thread_message_queue_recv(AVThreadMessageQueue
*mq
,
155 pthread_mutex_lock(&mq
->lock
);
156 ret
= av_thread_message_queue_recv_locked(mq
, msg
, flags
);
157 pthread_mutex_unlock(&mq
->lock
);
160 return AVERROR(ENOSYS
);
161 #endif /* HAVE_THREADS */
164 void av_thread_message_queue_set_err_send(AVThreadMessageQueue
*mq
,
168 pthread_mutex_lock(&mq
->lock
);
170 pthread_cond_broadcast(&mq
->cond
);
171 pthread_mutex_unlock(&mq
->lock
);
172 #endif /* HAVE_THREADS */
175 void av_thread_message_queue_set_err_recv(AVThreadMessageQueue
*mq
,
179 pthread_mutex_lock(&mq
->lock
);
181 pthread_cond_broadcast(&mq
->cond
);
182 pthread_mutex_unlock(&mq
->lock
);
183 #endif /* HAVE_THREADS */