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OSA : OS_Queue_IsEmpty

bool OS_Queue_IsEmpty (queue)
bool OS_Queue_IsEmpty_I (queue)

Check if queue of messages is empty.

OS_ENABLE_QUEUE constant must be defined in OSAcfg.h.

For PIC16, message queues can be allocated only in bank0 or bank1

Call allowed:



queue Queue of messages descriptor. Variable of OST_QUEUE type.


false there are some messages in the queue
true queue is free, no messages


OST_QUEUE queue;
void Task (void)
    for (;;) {
        if (OS_Queue_IsEmpty (queue)) {
            /* The queue is empty */
        } else {
            /* The queue has messages */

Old style name

See also

en/osa/ref/allservices/os_queue_isempty.txt · Last modified: 07.10.2010 13:57 (external edit)
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