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--- src/kernel/qeventloop_unix.cpp
+++ src/kernel/qeventloop_unix.cpp
@@ -517,6 +531,17 @@
return (tm->tv_sec*1000) + (tm->tv_usec/1000);
}
+static QString fullName(QObject* obj)
+{
+ QString oname;
+ if (obj && obj->name())
+ oname = QString(obj->name()) + "(" + QString(obj->className()) + ")";
+
+ if (obj && obj->parent())
+ return fullName(obj->parent()) + "/" + oname;
+ return oname;
+}
+
int QEventLoop::activateTimers()
{
if ( !timerList || !timerList->count() ) // no timers
@@ -552,9 +577,27 @@
t->timeout += t->interval;
if ( t->timeout < currentTime )
t->timeout = currentTime + t->interval;
+ // prefer system clock ticks for low resolution timers
+ // to save cpu power
+ if (t->interval.tv_sec * 1000 + t->interval.tv_usec / 1000 >= 1000) {
+ timeval drift;
+ drift.tv_sec = 0;
+ drift.tv_usec = (t->interval.tv_usec / 8) + (t->interval.tv_sec % 8) * 1000 * 1000 / 8;
+ timeval synced = t->timeout + drift;
+ if (synced.tv_usec < 2 * drift.tv_usec)
+ synced.tv_usec = 0;
+ t->timeout = synced;
+ }
insertTimer( t ); // relink timer
if ( t->interval.tv_usec > 0 || t->interval.tv_sec > 0 )
n_act++;
+
+ if (t->obj && getenv("QT_DEBUG_TIMER"))
+ qDebug("qtimer: %ld/%s %d ms for %p/%s %s",
+ getpid(), qApp && qApp->name() ? qApp->name() : "",
+ t->interval.tv_sec * 1000 + t->interval.tv_usec / 1000,
+ t->obj, fullName(t->obj).latin1(), t->obj->className());
+
QTimerEvent e( t->id );
QApplication::sendEvent( t->obj, &e ); // send event
if ( timerList->findRef( begin ) == -1 )
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