Semaphore

UINT32 LOS_SemCreate ( UINT16  usCount, UINT32 *  puwSemHandle   ) Create a Counting semaphore. Description: This API is used to create a semaphore control structure according to the initial number of available semaphores specified by usCount and return the ID of this semaphore control structure. 注意: None. 参数: 参数名称 描述 usCount  [IN] Initial number of available semaphores. The value range is [0, OS_SEM_COUNTING_MAX_COUNT). puwSemHandle  [OUT] ID of the semaphore control structure that is initialized. 返回值: 返回值 描述 LOS_ERRNO_SEM_PTR_NULL  The passed-in puwSemHandle value is NULL. LOS_ERRNO_SEM_OVERFLOW  The passed-in usCount value is greater than the maximum number of available semaphores. LOS_ERRNO_SEM_ALL_BUSY  No semaphore control structure is available. LOS_OK  The semaphore is successfully created. Dependency: los_sem.h: the header file that contains the API declaration. 参见: LOS_SemDelete 自从: Huawei LiteOS V100R001C00