92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*
|
|
* 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 */
|