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reset the QElapsedTimer in usecTimestampNow() periodically to prevent error

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ZappoMan 2014-11-04 11:01:37 -08:00
parent 1707025bd0
commit a89287e404
1 changed files with 20 additions and 0 deletions
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20
libraries/shared/src/SharedUtil.cpp
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@ -46,6 +46,26 @@ quint64 usecTimestampNow() {
TIME_REFERENCE = QDateTime::currentMSecsSinceEpoch() * 1000; // ms to usec
timestampTimer.start();
usecTimestampNowIsInitialized = true;
} else {
// We've seen the QElapsedTimer begin to introduce dramatic errors if it's been
// continuously running for a long time. So we will periodically reset it.
const quint64 SECS_TO_NSECS = 1000000000;
const quint64 RESET_AFTER_ELAPSED_SECS = 60 * 60; // 1 hour: 60 minutes * 60 seconds
const quint64 RESET_AFTER_ELAPSED_NSECS = RESET_AFTER_ELAPSED_SECS * SECS_TO_NSECS;
const quint64 nsecsElapsed = timestampTimer.nsecsElapsed();
if (nsecsElapsed > RESET_AFTER_ELAPSED_NSECS) {
quint64 msecsElapsed = timestampTimer.restart();
quint64 usecsElapsed = nsecsElapsed / 1000; // nsec to usec
TIME_REFERENCE += usecsElapsed;
const bool wantDebug = false;
if (wantDebug) {
qDebug() << "usecTimestampNow() - resetting QElapsedTimer. ";
qDebug() << " RESET_AFTER_ELAPSED_NSECS:" << RESET_AFTER_ELAPSED_NSECS;
qDebug() << " nsecsElapsed:" << nsecsElapsed;
qDebug() << " msecsElapsed:" << msecsElapsed;
qDebug() << " usecsElapsed:" << usecsElapsed;
}
}
}
// usec nsec to usec usec