Event

UINT32 LOS_EventRead ( PEVENT_CB_S  pstEventCB, UINT32  uwEventMask, UINT32  uwMode, UINT32  uwTimeOut   ) Read an event. Description: This API is used to block or schedule a task that reads an event of which the event control block, event mask, reading mode, and timeout information are specified. 注意: An error code and an event return value can be same. To differentiate the error code and return value, bit 25 of the event mask is forbidden to be used. 参数: 参数名称 描述 pstEventCB  [IN/OUT] Pointer to the event control block to be checked. This parameter must point to valid memory. uwEventMask  [IN] Mask of the event expected to occur by the user, indicating the event obtained after it is logically processed that matches the ID pointed to by uwEventID. uwMode  [IN] Event reading mode. uwTimeOut  [IN] Timeout interval of event reading (unit: Tick). 返回值: 返回值 描述 LOS_ERRNO_EVENT_SETBIT_INVALID  Bit 25 of the event mask cannot be set because it is set to an error number. LOS_ERRNO_EVENT_EVENTMASK_INVALID  The passed-in event reading mode is incorrect. LOS_ERRNO_EVENT_READ_IN_INTERRUPT  The event is being read during an interrupt. LOS_ERRNO_EVENT_FLAGS_INVALID  The event mode is invalid. LOS_ERRNO_EVENT_READ_IN_LOCK  The event reading task is locked. LOS_ERRNO_EVENT_PTR_NULL  The passed-in pointer is null. 0  The event expected by the user does not occur. UINT32  The event expected by the user occurs. Dependency: los_event.h: the header file that contains the API declaration. 参见: LOS_EventPoll | LOS_EventWrite 自从: Huawei LiteOS V100R001C00