本帖最后由 eng588 于 2013-11-5 20:44 编辑
当发消息时，有任务在等待，则直接将消息发给任务。这样其实破坏了FIFO啊。我觉得应将消息加入队列，然后再做任务切换。以下是发送消息的代码：
#if OS_Q_POST_EN > 0u
INT8U OSQPost (OS_EVENT *pevent,
void *pmsg)
{
OS_Q *pq;
#if OS_CRITICAL_METHOD == 3u /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr = 0u;
#endif
#if OS_ARG_CHK_EN > 0u
if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
return (OS_ERR_PEVENT_NULL);
}
#endif
if (pevent->OSEventType != OS_EVENT_TYPE_Q) { /* Validate event block type */
return (OS_ERR_EVENT_TYPE);
}
OS_ENTER_CRITICAL();
if (pevent->OSEventGrp != 0u) { /* See if any task pending on queue */
/* Ready highest priority task waiting on event */
(void)OS_EventTaskRdy(pevent, pmsg, OS_STAT_Q, OS_STAT_PEND_OK);
OS_EXIT_CRITICAL();
OS_Sched(); /* Find highest priority task ready to run */
return (OS_ERR_NONE);
}
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;
}
OS_EXIT_CRITICAL();
return (OS_ERR_NONE);
}
#endif
|
楼主
标题置顶
标题高亮
