120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/******************************************************************************
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*
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* Copyright 2007, Silicon Image, Inc. All rights reserved.
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* No part of this work may be reproduced, modified, distributed, transmitted,
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* transcribed, or translated into any language or computer format, in any form
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* or by any means without written permission of: Silicon Image, Inc., 1060
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* East Arques Avenue, Sunnyvale, California 94085
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*
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*****************************************************************************/
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/**
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* @file media_buffer.c
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*
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* @brief
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* Media Buffer implementation
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*
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* <pre>
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*
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* Principal Author: Joerg Detert
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* Creation date: Feb 28, 2008
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*
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* </pre>
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*
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*****************************************************************************/
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#include <pthread.h>
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#include "media_buffer.h"
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#include "media_buffer_pool.h"
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static pthread_mutex_t gAtomicMutex;
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void AtomicMutexInit()
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{
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pthread_mutex_init (&gAtomicMutex, NULL);
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}
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void AtomicMutexDestory()
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{
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pthread_mutex_destroy (&gAtomicMutex);
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}
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static uint32_t osAtomicIncrement(uint32_t* pVar)
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{
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uint32_t ret;
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/* Lock the atomic mutex */
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pthread_mutex_lock(&gAtomicMutex);
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/* increment */
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ret = ++(*pVar);
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/* Unlock the atomic mutex */
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pthread_mutex_unlock(&gAtomicMutex);
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return ret;
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}
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static uint32_t osAtomicDecrement(uint32_t* pVar)
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{
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uint32_t ret;
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/* Lock the atomic mutex */
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pthread_mutex_lock(&gAtomicMutex);
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/* increment */
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ret = --(*pVar);
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/* Unlock the atomic mutex */
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pthread_mutex_unlock(&gAtomicMutex);
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return ret;
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}
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/******************************************************************************
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* MediaBufInit
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*****************************************************************************/
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void MediaBufInit(MediaBuffer_t *pBuf)
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{
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DCT_ASSERT(pBuf != NULL);
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pBuf->lockCount = 0U;
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pBuf->pOwner = NULL;
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}
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/******************************************************************************
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* MediaBufLockBuffer
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*****************************************************************************/
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RESULT MediaBufLockBuffer(MediaBuffer_t* pBuf)
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{
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DCT_ASSERT(pBuf != NULL);
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DCT_ASSERT(pBuf->pOwner != NULL);
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osAtomicIncrement( &pBuf->lockCount );
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return RET_SUCCESS;
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}
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/******************************************************************************
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* MediaBufUnlockBuffer
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*****************************************************************************/
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RESULT MediaBufUnlockBuffer(MediaBuffer_t* pBuf)
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{
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DCT_ASSERT(pBuf != NULL);
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if (pBuf->pOwner == NULL)
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{
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return RET_FAILURE;
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}
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uint32_t val = osAtomicDecrement( &pBuf->lockCount );
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if(val == 0U)
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{
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MediaBufPoolFreeBuffer(pBuf->pOwner, pBuf);
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}
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return RET_SUCCESS;
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}
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