It's the epicsEventWaitWithTimeout(). This allows the pause to be interrupted early in the case of IOC shutdown.
static void periodicTask(void *arg)
{
periodic_scan_list *ppsl = (periodic_scan_list *)arg;
epicsTimeStamp nextScan, now;
double delay;
taskwdInsert(0, NULL, NULL);
epicsEventSignal(startStopEvent);
epicsTimeGetCurrent(&nextScan);
while (ppsl->scanCtl != ctlExit) {
if (ppsl->scanCtl == ctlRun) scanList(&ppsl->scan_list);
nextScan += ppsl->period;
epicsTimeGetCurrent(&now);
delay = epicsTimeDiffInSeconds(&nextScan, &now);
if (delay <= 0.0) {
ppsl->overrunCount++;
delay = 0.01;
epicsTimeGetCurrent(&nextScan);
}
epicsEventWaitWithTimeout(ppsl->loopEvent, delay); <<<<===== Here's where the magic happens.
}
taskwdRemove(0);
epicsEventSignal(startStopEvent);
}
On Jan 9, 2013, at 10:35 AM, Jack Smith <[email protected]> wrote:
> Wow, amazing! It seems Eric fixed the problem which has been known for
> 2.5 years.
>
> A little bit off-topic question: when I look through periodicTask( )
> which is the thread created by spawnPeriodic() for individual
> corresponding scanning period, I don't see any kind of 'timer' to
> trigger scanList(&ppsl->scan_list). So, my question is how scanList(
> ) is periodically called in periodicTask( ) and where the 'timer'
> thing is?
>
> Thanks,
>
> Jack
>
--
Eric Norum
[email protected]
- References:
- time drift in camonitor timestamps ibadillo
- RE: time drift in camonitor timestamps Mark Rivers
- Re: time drift in camonitor timestamps Michael Davidsaver
- Re: time drift in camonitor timestamps inari badillo
- Re: time drift in camonitor timestamps Ralph Lange
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