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- /*
- * 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
- */
- #ifndef AVUTIL_THREADMESSAGE_H
- #define AVUTIL_THREADMESSAGE_H
- typedef struct AVThreadMessageQueue AVThreadMessageQueue;
- typedef enum AVThreadMessageFlags {
- /**
- * Perform non-blocking operation.
- * If this flag is set, send and recv operations are non-blocking and
- * return AVERROR(EAGAIN) immediately if they can not proceed.
- */
- AV_THREAD_MESSAGE_NONBLOCK = 1,
- } AVThreadMessageFlags;
- /**
- * Allocate a new message queue.
- *
- * @param mq pointer to the message queue
- * @param nelem maximum number of elements in the queue
- * @param elsize size of each element in the queue
- * @return >=0 for success; <0 for error, in particular AVERROR(ENOSYS) if
- * lavu was built without thread support
- */
- int av_thread_message_queue_alloc(AVThreadMessageQueue **mq,
- unsigned nelem,
- unsigned elsize);
- /**
- * Free a message queue.
- *
- * The message queue must no longer be in use by another thread.
- */
- void av_thread_message_queue_free(AVThreadMessageQueue **mq);
- /**
- * Send a message on the queue.
- */
- int av_thread_message_queue_send(AVThreadMessageQueue *mq,
- void *msg,
- unsigned flags);
- /**
- * Receive a message from the queue.
- */
- int av_thread_message_queue_recv(AVThreadMessageQueue *mq,
- void *msg,
- unsigned flags);
- /**
- * Set the sending error code.
- *
- * If the error code is set to non-zero, av_thread_message_queue_recv() will
- * return it immediately when there are no longer available messages.
- * Conventional values, such as AVERROR_EOF or AVERROR(EAGAIN), can be used
- * to cause the receiving thread to stop or suspend its operation.
- */
- void av_thread_message_queue_set_err_send(AVThreadMessageQueue *mq,
- int err);
- /**
- * Set the receiving error code.
- *
- * If the error code is set to non-zero, av_thread_message_queue_send() will
- * return it immediately. Conventional values, such as AVERROR_EOF or
- * AVERROR(EAGAIN), can be used to cause the sending thread to stop or
- * suspend its operation.
- */
- void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq,
- int err);
- #endif /* AVUTIL_THREADMESSAGE_H */
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