#define  OS_EVENT_EN           (((OS_Q_EN > 0u) && (OS_MAX_QS > 0u)) || (OS_MBOX_EN > 0u) || (OS_SEM_EN > 0u) || (OS_MUTEX_EN > 0u))

typedef struct os_event {INT8U    OSEventType;                    /* Type of event control block (see OS_EVENT_TYPE_xxxx)    */void    *OSEventPtr;                     /* Pointer to message or queue structure                   */INT16U   OSEventCnt;                     /* Semaphore Count (not used if other EVENT type)          */OS_PRIO  OSEventGrp;                     /* Group corresponding to tasks waiting for event to occur */OS_PRIO  OSEventTbl[OS_EVENT_TBL_SIZE];  /* List of tasks waiting for event to occur                */#if OS_EVENT_NAME_EN > 0uINT8U   *OSEventName;
#endif
} OS_EVENT;

msg_key=OSMboxCreate((void*)0);   //创建邮箱并初始化为空

typedef struct os_q {                   /* QUEUE CONTROL BLOCK                                         */struct os_q   *OSQPtr;              /* Link to next queue control block in list of free blocks     */void         **OSQStart;            /* Pointer to start of queue data                              */void         **OSQEnd;              /* Pointer to end   of queue data                              */void         **OSQIn;               /* Pointer to where next message will be inserted  in   the Q  */void         **OSQOut;              /* Pointer to where next message will be extracted from the Q  */INT16U         OSQSize;             /* Size of queue (maximum number of entries)                   */INT16U         OSQEntries;          /* Current number of entries in the queue                      */
} OS_Q;

pq = (OS_Q *)pevent->OSEventPtr;             /* Point at queue control block                       */if (pq->OSQEntries > 0u) {                   /* See if any messages in the queue                   */pmsg = *pq->OSQOut++;                    /* Yes, extract oldest message from the queue         */pq->OSQEntries--;                        /* Update the number of entries in the queue          */if (pq->OSQOut == pq->OSQEnd) {          /* Wrap OUT pointer if we are at the end of the queue */pq->OSQOut = pq->OSQStart;}OS_EXIT_CRITICAL();*perr = OS_ERR_NONE;return (pmsg);                           /* Return message received                            */}

 pq = (OS_Q *)pevent->OSEventPtr;                   /* Point to queue control block                 */if (pq->OSQEntries >= pq->OSQSize) {               /* Make sure queue is not full                  */OS_EXIT_CRITICAL();return (OS_ERR_Q_FULL);}*pq->OSQIn++ = pmsg;                               /* Insert message into queue                    */pq->OSQEntries++;                                  /* Update the nbr of entries in the queue       */if (pq->OSQIn == pq->OSQEnd) {                     /* Wrap IN ptr if we are at end of queue        */pq->OSQIn = pq->OSQStart;}