threadmessage.h File Reference

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Enumerations
enum	AVThreadMessageFlags { AV_THREAD_MESSAGE_NONBLOCK = 1 }

Functions
int	av_thread_message_queue_alloc (AVThreadMessageQueue **mq, unsigned nelem, unsigned elsize)
	Allocate a new message queue. More...
void	av_thread_message_queue_free (AVThreadMessageQueue **mq)
	Free a message queue. More...
int	av_thread_message_queue_send (AVThreadMessageQueue *mq, void *msg, unsigned flags)
	Send a message on the queue. More...
int	av_thread_message_queue_recv (AVThreadMessageQueue *mq, void *msg, unsigned flags)
	Receive a message from the queue. More...
void	av_thread_message_queue_set_err_send (AVThreadMessageQueue *mq, int err)
	Set the sending error code. More...
void	av_thread_message_queue_set_err_recv (AVThreadMessageQueue *mq, int err)
	Set the receiving error code. More...

Enumeration Type Documentation

enum AVThreadMessageFlags

Enumerator
AV_THREAD_MESSAGE_NONBLOCK	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.

Definition at line 24 of file threadmessage.h.

Function Documentation

int av_thread_message_queue_alloc	(	AVThreadMessageQueue **	mq,
		unsigned	nelem,
		unsigned	elsize
	)

Allocate a new message queue.

Parameters

mq	pointer to the message queue
nelem	maximum number of elements in the queue
elsize	size of each element in the queue

Returns

>=0 for success; <0 for error, in particular AVERROR(ENOSYS) if lavu was built without thread support

Definition at line 48 of file threadmessage.c.

void av_thread_message_queue_free

(

AVThreadMessageQueue **

mq

)

Free a message queue.

The message queue must no longer be in use by another thread.

Definition at line 84 of file threadmessage.c.

int av_thread_message_queue_send	(	AVThreadMessageQueue *	mq,
		void *	msg,
		unsigned	flags
	)

Send a message on the queue.

Definition at line 132 of file threadmessage.c.

int av_thread_message_queue_recv	(	AVThreadMessageQueue *	mq,
		void *	msg,
		unsigned	flags
	)

Receive a message from the queue.

Definition at line 148 of file threadmessage.c.

void av_thread_message_queue_set_err_send	(	AVThreadMessageQueue *	mq,
		int	err
	)

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.

Definition at line 164 of file threadmessage.c.

void av_thread_message_queue_set_err_recv	(	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.

Definition at line 175 of file threadmessage.c.