RTOS接口-Semaphores

原创已于 2025-05-01 20:53:50 修改 · 313 阅读

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#信号量 #rtos

于 2025-05-01 20:52:30 首次发布

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跟Linux下面的信号量的PV操作是一个思想

接口

/*Create and Initialize a Semaphore object.*/
osSemaphoreId_t  osSemaphoreNew (uint32_t max_count, uint32_t initial_count, const osSemaphoreAttr_t *attr)
 	
/*Get name of a Semaphore object.*/
const char *  osSemaphoreGetName (osSemaphoreId_t semaphore_id)
 	
/*Acquire a Semaphore token or timeout if no tokens are available.*/
osStatus_t 	osSemaphoreAcquire (osSemaphoreId_t semaphore_id, uint32_t timeout)
 	
/*Release a Semaphore token up to the initial maximum count.*/
osStatus_t 	osSemaphoreRelease (osSemaphoreId_t semaphore_id)
 	
/*Get current Semaphore token count.*/
uint32_t  osSemaphoreGetCount (osSemaphoreId_t semaphore_id)

/*Delete a Semaphore object.*/ 
osStatus_t 	osSemaphoreDelete (osSemaphoreId_t semaphore_id)

代码举例

osSemaphoreId_t multiplex_id;
 
void thread_n (void) {
 
  multiplex_id = osSemaphoreNew(3U, 3U, NULL);
  while(1) {
    osSemaphoreAcquire(multiplex_id, osWaitForever);
    // do something
    osSemaphoreRelease(multiplex_id);
  }
}

当信号量的数量为1时，实现的功能就跟互斥锁没有区别了