139 lines
2.5 KiB
C
139 lines
2.5 KiB
C
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/*
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* Copyright (c) 2008-2016 Allwinner Technology Co. Ltd.
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* All rights reserved.
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*
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* File : omx_tsem.c
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*
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* Description : pthread operation
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* History :
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*
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#include <pthread.h>
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#include <sys/time.h>
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#include <errno.h>
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#include "omx_tsem.h"
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#include "log.h"
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/** Initializes the semaphore at a given value
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*
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* @param tsem the semaphore to initialize
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* @param val the initial value of the semaphore
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*
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*/
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int omx_sem_init(omx_sem_t* tsem, unsigned int uVal)
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{
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int nRet;
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nRet = pthread_cond_init(&tsem->sCondition, NULL);
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if (nRet!=0)
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{
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return -1;
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}
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nRet = pthread_mutex_init(&tsem->mMutex, NULL);
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if (nRet!=0)
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{
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return -1;
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}
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tsem->uSemval = uVal;
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return 0;
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}
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/** Destroy the semaphore
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*
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* @param tsem the semaphore to destroy
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*/
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void omx_sem_deinit(omx_sem_t* tsem)
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{
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pthread_cond_destroy(&tsem->sCondition);
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pthread_mutex_destroy(&tsem->mMutex);
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}
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/** Decreases the value of the semaphore. Blocks if the semaphore
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* value is zero.
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*
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* @param tsem the semaphore to decrease
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*/
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void omx_sem_down(omx_sem_t* tsem)
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{
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pthread_mutex_lock(&tsem->mMutex);
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while (tsem->uSemval == 0)
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{
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pthread_cond_wait(&tsem->sCondition, &tsem->mMutex);
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}
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tsem->uSemval--;
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pthread_mutex_unlock(&tsem->mMutex);
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}
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/** Increases the value of the semaphore
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*
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* @param tsem the semaphore to increase
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*/
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void omx_sem_up(omx_sem_t* tsem)
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{
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pthread_mutex_lock(&tsem->mMutex);
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tsem->uSemval++;
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pthread_cond_signal(&tsem->sCondition);
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pthread_mutex_unlock(&tsem->mMutex);
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}
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/** Reset the value of the semaphore
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*
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* @param tsem the semaphore to reset
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*/
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void omx_sem_reset(omx_sem_t* tsem)
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{
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CEDARC_UNUSE(omx_sem_reset);
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pthread_mutex_lock(&tsem->mMutex);
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tsem->uSemval=0;
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pthread_mutex_unlock(&tsem->mMutex);
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}
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/** Wait on the sCondition.
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*
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* @param tsem the semaphore to wait
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*/
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void omx_sem_wait(omx_sem_t* tsem)
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{
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CEDARC_UNUSE(omx_sem_wait);
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pthread_mutex_lock(&tsem->mMutex);
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pthread_cond_wait(&tsem->sCondition, &tsem->mMutex);
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pthread_mutex_unlock(&tsem->mMutex);
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}
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/** Signal the sCondition,if waiting
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*
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* @param tsem the semaphore to signal
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*/
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void omx_sem_signal(omx_sem_t* tsem)
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{
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CEDARC_UNUSE(omx_sem_signal);
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pthread_mutex_lock(&tsem->mMutex);
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pthread_cond_signal(&tsem->sCondition);
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pthread_mutex_unlock(&tsem->mMutex);
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}
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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