PITimeMeasurer remove some API, add elapsedAndReset()

got rid off some warnings

libs/main/thread/pithread.cpp

@@ -833,11 +833,11 @@ bool PIThread::waitForFinish(PISystemTime timeout) {
 		}
 		return true;
 	}
-	tmf_.reset();
-	while (tmf_.elapsed() < timeout) {
+	PITimeMeasurer tm;
+	while (tm.elapsed() < timeout) {
 		if (_waitForFinish(PISystemTime::fromMilliseconds(PIP_MIN_MSLEEP))) return true;
 	}
-	return tmf_.elapsed() < timeout;
+	return tm.elapsed() < timeout;
 }
 
 
@@ -848,10 +848,10 @@ bool PIThread::waitForStart(PISystemTime timeout) {
 			piMinSleep();
 		return true;
 	}
-	tms_.reset();
-	while (!running_ && tms_.elapsed() < timeout)
+	PITimeMeasurer tm;
+	while (!running_ && tm.elapsed() < timeout)
 		piMinSleep();
-	return tms_.elapsed() < timeout;
+	return tm.elapsed() < timeout;
 }
 
 
@@ -950,10 +950,10 @@ void PIThread::__thread_func__() {
 		// PICout(PICoutManipulators::DefaultControls) << "thread" << this << "wait" << "...";
 		PIINTROSPECTION_THREAD_WAIT(this);
 		if (delay_.isNotNull()) {
-			tmr_.reset();
+			PITimeMeasurer tm;
 			double sl(0.);
 			while (1) {
-				sl = piMind(delay_.toMilliseconds() - tmr_.elapsed_m(), PIP_MIN_MSLEEP);
+				sl = piMind(delay_.toMilliseconds() - tm.elapsed_m(), PIP_MIN_MSLEEP);
 				if (terminating) break;
 				if (sl <= 0.) break;
 				piMSleep(sl);