Re: time drift in camonitor timestamps

[Eric Norum <eric@norum.ca>]

Sorry.
Previous message had wrong periodicTask code.  Here's what I meant to send.

Jack, can you try this and see if it fixes the problem that you were seeing/


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);
        epicsTimeAddSeconds(&nextScan, ppsl->period);
        epicsTimeGetCurrent(&now);
        delay = epicsTimeDiffInSeconds(&nextScan, &now);
        if (delay <= 0.0) {
            ppsl->overrunCount++;
            delay = 0.02;
            epicsTimeGetCurrent(&nextScan);
        }
        epicsEventWaitWithTimeout(ppsl->loopEvent, delay);
    }

    taskwdRemove(0);
    epicsEventSignal(startStopEvent);
}

-- 
Eric Norum
eric@norum.ca