/usr/include/bellagio/queue.h is in libomxil-bellagio-dev 0.9.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | /**
src/queue.h
Implements a simple FIFO structure used for queueing OMX buffers.
Copyright (C) 2007-2009 STMicroelectronics
Copyright (C) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
This library 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.
This library 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 this library; if not, write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#ifndef __TQUEUE_H__
#define __TQUEUE_H__
#include <pthread.h>
/** Maximum number of elements in a queue
*/
#define MAX_QUEUE_ELEMENTS 10
/** Output port queue element. Contains an OMX buffer header type
*/
typedef struct qelem_t qelem_t;
struct qelem_t{
qelem_t* q_forw;
void* data;
};
/** This structure contains the queue
*/
typedef struct queue_t{
qelem_t* first; /**< Output buffer queue head */
qelem_t* last; /**< Output buffer queue tail */
int nelem; /**< Number of elements in the queue */
pthread_mutex_t mutex;
} queue_t;
/** Initialize a queue descriptor
*
* @param queue The queue descriptor to initialize.
* The user needs to allocate the queue
*
* @return -1 if the resources are not enough and the allocation cannot be performed
*/
int queue_init(queue_t* queue);
/** Deinitialize a queue descriptor
* flushing all of its internal data
*
* @param queue the queue descriptor to dump
*/
void queue_deinit(queue_t* queue);
/** Enqueue an element to the given queue descriptor
*
* @param queue the queue descritpor where to queue data
*
* @param data the data to be enqueued
*
* @return -1 if the queue is full
*/
int queue(queue_t* queue, void* data);
/** Dequeue an element from the given queue descriptor
*
* @param queue the queue descriptor from which to dequeue the element
*
* @return the element that has bee dequeued. If the queue is empty
* a NULL value is returned
*/
void* dequeue(queue_t* queue);
/** Returns the number of elements hold in the queue
*
* @param queue the requested queue
*
* @return the number of elements in the queue
*/
int getquenelem(queue_t* queue);
#endif
|