epicsUInt32
evgMrm::sendTimestamp() {
/*Start the timer*/
m_timerEvent->signal();
/*If the time since last update is more than 1.5 secs(i.e. if wdTimer expires)
then we need to resync the time after 5 good pulses*/
if(m_wdTimer->getPilotCount()) {
m_wdTimer->decrPilotCount();
if(m_wdTimer->getPilotCount() == 0) {
syncTimestamp();
printf("Starting timestamping\n");
((epicsTime)getTimestamp()).show(1);
}
return 0;
}
m_alarmTimestamp = TS_ALARM_NONE;
incrTimestamp();
scanIoRequest(ioScanTimestamp);
if(m_syncTimestamp) {
syncTimestamp();
m_syncTimestamp = false;
}
struct epicsTimeStamp ts;
epicsTime ntpTime, storedTime;
if(epicsTimeOK == generalTimeGetExceptPriority(&ts, 0, 50)) {
ntpTime = ts;
storedTime = (epicsTime)getTimestamp();
double errorTime = ntpTime - storedTime;
/*If there is an error between storedTime and ntpTime then we just print
the relevant information but we send out storedTime*/
if(fabs(errorTime) > evgAllowedTsGitter) {
m_alarmTimestamp = TS_ALARM_MINOR;
printf("NTP time:\n");
ntpTime.show(1);
printf("EVG time:\n");
storedTime.show(1);
printf("----Timestamping Error of %f Secs----\n", errorTime);
}
}
return getTimestamp().secPastEpoch + 1 + POSIX_TIME_AT_EPICS_EPOCH;
}
void
evgMrm::syncTimestamp() {
if(epicsTimeOK != generalTimeGetExceptPriority(&m_timestamp, 0, 50))
return;
/*
* Generally nano seconds should be close to zero.
* So the seconds value should be rounded to the nearest interger
* e.g. 26.000001000 should be rounded to 26 and
* 26.996234643 should be rounded to 27.
* Also the nano second value can be assumed to be zero.
*/
if(m_timestamp.nsec > 500*pow(10,6))
incrTimestamp();
m_timestamp.nsec = 0;
}
static void ClockTimeSync(void *dummy)
{
taskwdInsert(0, NULL, NULL);
for (epicsEventWaitWithTimeout(ClockTimePvt.loopEvent,
ClockTimeSyncInterval);
ClockTimePvt.synchronize == CLOCKTIME_SYNC;
epicsEventWaitWithTimeout(ClockTimePvt.loopEvent,
ClockTimeSyncInterval)) {
epicsTimeStamp timeNow;
int priority;
if (generalTimeGetExceptPriority(&timeNow, &priority,
LAST_RESORT_PRIORITY) == epicsTimeOK) {
struct timespec clockNow;
epicsTimeToTimespec(&clockNow, &timeNow);
if (clock_settime(CLOCK_REALTIME, &clockNow)) {
errlogPrintf("ClockTimeSync: clock_settime failed\n");
continue;
}
epicsMutexMustLock(ClockTimePvt.lock);
if (!ClockTimePvt.synchronized) {
ClockTimePvt.startTime = timeNow;
ClockTimePvt.synchronized = 1;
}
ClockTimePvt.syncFromPriority = priority;
ClockTimePvt.syncTime = timeNow;
epicsMutexUnlock(ClockTimePvt.lock);
}
}
ClockTimePvt.synchronized = 0;
taskwdRemove(0);
}
int epicsShareAPI epicsTimeGetCurrent(epicsTimeStamp *pDest)
{
return generalTimeGetExceptPriority(pDest, NULL, 0);
}