这里的源码是不是有错误哎？？？

橘子汁真好喝 · 发表于 2022-4-21 17:12:16

标蓝这里的程序：BaseType_t xQueueReceiveFromISR( QueueHandle_t xQueue, void * const pvBuffer, BaseType_t * const pxHigherPriorityTaskWoken ){
BaseType_t xReturn;
UBaseType_t uxSavedInterruptStatus;
Queue_t * const pxQueue = ( Queue_t * ) xQueue;

uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
{
const UBaseType_t uxMessagesWaiting = pxQueue->uxMessagesWaiting;

/* Cannot block in an ISR, so check there is data available. */
if( uxMessagesWaiting > ( UBaseType_t ) 0 )
{
const int8_t cRxLock = pxQueue->cRxLock;

traceQUEUE_RECEIVE_FROM_ISR( pxQueue );

prvCopyDataFromQueue( pxQueue, pvBuffer );
pxQueue->uxMessagesWaiting = uxMessagesWaiting - 1;

/* If the queue is locked the event list will not be modified.
Instead update the lock count so the task that unlocks the queue
will know that an ISR has removed data while the queue was
locked. */
if( cRxLock == queueUNLOCKED )//出队未上锁
{
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
{
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
{
/* The task waiting has a higher priority than us so
force a context switch. */
if( pxHigherPriorityTaskWoken != NULL )
{
*pxHigherPriorityTaskWoken = pdTRUE;
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
/* Increment the lock count so the task that unlocks the queue
knows that data was removed while it was locked. */
pxQueue->cRxLock = ( int8_t ) ( cRxLock + 1 );
}

xReturn = pdPASS;
}
else
{
xReturn = pdFAIL;
traceQUEUE_RECEIVE_FROM_ISR_FAILED( pxQueue );
}
}
portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );

return xReturn;
}
是从这个程序中节选的，我就是感觉条件判断不应该是！=，应该是==，这样这句代码才有意义。