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OSA : OS_Squeue_Wait_TO

OS_Squeue_Wait_TO (squeue, os_smsg_type_var, timeout)

Allowed only in taskSwitches contextUses timer

Same as OS_Squeue_Wait with exit if timeout expires. If timeout expires before message received, then stop waiting with Timeout flag set (see OS_IsTimeout)

OS_ENABLE_SQUEUE constant must be defined in OSAcfg.h.

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

Call allowed:

Only in task


squeue Queue of simple messages descriptor. Variable of OST_SQUEUE type.
os_smsg_type_var Variable of OST_SMSG type, where simple message will be placed
timeout Time of waiting in system ticks - calling OS_Timer periods


timeout If timeout expired then system service OS_IsTimeout will return true


OST_SQUEUE squeue;
void Task (void)
    OST_SMSG smsg;
    for (;;) {
        OS_Squeue_Wait_TO(squeue, smsg, 100);
        if (!OS_IsTimeout()) {
            // Simple message received and stored into smsg

Old style name


See also

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