一个有关UCOSII的问题

只看该作者 · 2007-4-18 07:57

下面是OSQCreate()的源代码:
OS_EVENT  *OSQCreate (void **start, INT16U size)
{
#if OS_CRITICAL_METHOD == 3                      /* Allocate storage for CPU status register           */
    OS_CPU_SR  cpu_sr;
#endif
    OS_EVENT  *pevent;
    OS_Q      *pq;

    if (OSIntNesting > 0) {                      /* See if called from ISR ...                         */
        return ((OS_EVENT *)0);                  /* ... can't CREATE from an ISR                       */
    }
    OS_ENTER_CRITICAL();
    pevent = OSEventFreeList;                    /* Get next free event control block                  */
    if (OSEventFreeList != (OS_EVENT *)0) {      /* See if pool of free ECB pool was empty             */
        OSEventFreeList = (OS_EVENT *)OSEventFreeList->OSEventPtr;
    }
    OS_EXIT_CRITICAL();
    if (pevent != (OS_EVENT *)0) {               /* See if we have an event control block              */
        OS_ENTER_CRITICAL();
        pq = OSQFreeList;                        /* Get a free queue control block                     */
        if (pq != (OS_Q *)0) {                   /* Were we able to get a queue control block ?        */
            OSQFreeList            = OSQFreeList->OSQPtr; /* Yes, Adjust free list pointer to next free*/
            OS_EXIT_CRITICAL();
            pq->OSQStart           = start;               /*      Initialize the queue                 */
            pq->OSQEnd             = &start[size];/*Error*/
            pq->OSQIn              = start;
            pq->OSQOut             = start;
            pq->OSQSize            = size;
            pq->OSQEntries         = 0;
            pevent->OSEventType    = OS_EVENT_TYPE_Q;
            pevent->OSEventCnt     = 0;
            pevent->OSEventPtr     = pq;
#if OS_EVENT_NAME_SIZE > 1
            pevent->OSEventName[0] = '?';                  /* Unknown name                             */
            pevent->OSEventName[1] = OS_ASCII_NUL;
#endif
            OS_EventWaitListInit(pevent);                 /*      Initalize the wait list              */
        } else {
            pevent->OSEventPtr = (void *)OSEventFreeList; /* No,  Return event control block on error  */
            OSEventFreeList    = pevent;
            OS_EXIT_CRITICAL();
            pevent = (OS_EVENT *)0;
        }
    }
    return (pevent);
}
下面是邵老师一书中提供的源代码，请问有没有问题
OS_EVENT *CommQ;
void *CommMsgp[10];
void main(void)
{
  OSInit();
.
.
.
CommQ = OSQCreate(&CommMsg[0],10);/*注此处是否有问题看上面Error标注位置是否会出现数组溢出的问题*/
OSStart();
}
pq->OSQEnd             = &start[size];/*Error*/
*注此处是否有问题看上面Error标注位置是否会出现数组溢出的问题*/

一个有关UCOSII的问题

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