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OSA : OS_Csem_Wait_TO

OS_Csem_Wait_TO (csem, timeout)

Allowed only in taskSwitches contextUses timer

Wait for counting semaphore. If timeout expires before this event occurs, then stop waiting with Timeout flag set (see OS_IsTimeout)

OS_ENABLE_CSEM constant must be defined in OSAcfg.h. Size of counting semaphores is defined by OS_CSEM_SIZE constant

For PIC16, counting semaphores can only be allocated in bank0 or bank1

Call allowed:

Only in task


csem Counting semaphore. Variable of OST_CSEM type
timeout Time of waiting in system ticks - calling OS_Timer periods


timeout If timeout expired then system service OS_IsTimeout will return true


OST_CSEM csem;
void Task (void)
    for (;;) {
        OS_Csem_Wait_TO (csem, 300); // wait 300 ticks for csem
        if (!OS_IsTimeout()) {

Old style name


See also

en/osa/ref/allservices/os_csem_wait_to.txt · Last modified: 07.10.2010 13:56 (external edit)
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