diff --git a/src_main/thread/pitimer.cpp b/src_main/thread/pitimer.cpp
index 87827bbd..f7005539 100755
--- a/src_main/thread/pitimer.cpp
+++ b/src_main/thread/pitimer.cpp
@@ -61,14 +61,14 @@ _PITimerBase::_PITimerBase() {
 void _PITimerBase::setInterval(double i) {
 	interval_ = i;
 	if (isRunning()) {
-		stop();
+		stop(true);
 		start();
 	}
 }
 
 
 bool _PITimerBase::start(double interval_ms) {
-	if (isRunning()) stop();
+	if (isRunning()) stop(true);
 	deferred_ = false;
 	setInterval(interval_ms);
 	running_ = startTimer(interval_ms);
@@ -77,7 +77,7 @@ bool _PITimerBase::start(double interval_ms) {
 
 
 void _PITimerBase::startDeferred(double interval_ms, PIDateTime start_datetime) {
-	if (isRunning()) stop();
+	if (isRunning()) stop(true);
 	deferred_ = true;
 	deferred_mode = true;
 	deferred_datetime = start_datetime;
@@ -87,7 +87,7 @@ void _PITimerBase::startDeferred(double interval_ms, PIDateTime start_datetime)
 
 
 void _PITimerBase::startDeferred(double interval_ms, double delay_ms) {
-	if (isRunning()) stop();
+	if (isRunning()) stop(true);
 	deferred_ = true;
 	deferred_mode = false;
 	deferred_delay = delay_ms;
@@ -96,9 +96,9 @@ void _PITimerBase::startDeferred(double interval_ms, double delay_ms) {
 }
 
 
-bool _PITimerBase::stop() {
+bool _PITimerBase::stop(bool wait) {
 	if (!isRunning()) return true;
-	running_ = !stopTimer();
+	running_ = !stopTimer(wait);
 	return !running_;
 }
 
@@ -115,7 +115,7 @@ protected:
 	int wait_dt, wait_dd, wait_tick;
 private:
 	virtual bool startTimer(double interval_ms);
-	virtual bool stopTimer();
+	virtual bool stopTimer(bool wait);
 	static void threadFuncS(void * d) {((_PITimerImp_Thread*)d)->threadFunc();}
 	void adjustTimes();
 
@@ -133,7 +133,7 @@ public:
 protected:
 private:
 	virtual bool startTimer(double interval_ms);
-	virtual bool stopTimer();
+	virtual bool stopTimer(bool wait);
 
 	int ti;
 	_PITimerImp_RT_Private_ * priv;
@@ -144,7 +144,7 @@ private:
 class _PITimerImp_Pool: public _PITimerImp_Thread {
 public:
 	_PITimerImp_Pool();
-	virtual ~_PITimerImp_Pool() {stop();}
+	virtual ~_PITimerImp_Pool() {stop(true);}
 private:
 	class Pool: public PIThread {
 	public:
@@ -157,7 +157,7 @@ private:
 		PIVector<_PITimerImp_Pool * > timers, to_remove;
 	};
 	virtual bool startTimer(double interval_ms);
-	virtual bool stopTimer();
+	virtual bool stopTimer(bool wait);
 };
 
 
@@ -173,7 +173,7 @@ _PITimerImp_Thread::_PITimerImp_Thread() {
 
 
 _PITimerImp_Thread::~_PITimerImp_Thread() {
-	stop();
+	stop(true);
 }
 
 
@@ -202,11 +202,12 @@ bool _PITimerImp_Thread::startTimer(double interval_ms) {
 }
 
 
-bool _PITimerImp_Thread::stopTimer() {
+bool _PITimerImp_Thread::stopTimer(bool wait) {
 	thread_.stop();
-	if (!thread_.waitForFinish(10))
-		if (thread_.isRunning())
-			thread_.terminate();
+	if (wait)
+		if (!thread_.waitForFinish(10))
+			if (thread_.isRunning())
+				thread_.terminate();
 	return true;
 }
 
@@ -311,7 +312,7 @@ _PITimerImp_RT::_PITimerImp_RT() {
 
 
 _PITimerImp_RT::~_PITimerImp_RT() {
-	stop();
+	stop(true);
 	delete priv;
 }
 
@@ -344,7 +345,7 @@ bool _PITimerImp_RT::startTimer(double interval_ms) {
 }
 
 
-bool _PITimerImp_RT::stopTimer() {
+bool _PITimerImp_RT::stopTimer(bool wait) {
 	if (ti < 0) return true;
 	timer_delete(priv->tt);
 	ti = -1;
@@ -425,7 +426,7 @@ bool _PITimerImp_Pool::startTimer(double interval_ms) {
 }
 
 
-bool _PITimerImp_Pool::stopTimer() {
+bool _PITimerImp_Pool::stopTimer(bool wait) {
 	Pool::instance()->remove(this);
 	return true;
 }
diff --git a/src_main/thread/pitimer.h b/src_main/thread/pitimer.h
index 9ada636b..d2deeb5e 100755
--- a/src_main/thread/pitimer.h
+++ b/src_main/thread/pitimer.h
@@ -35,7 +35,7 @@ class _PITimerBase {
 	friend class PITimer;
 public:
 	_PITimerBase();
-	virtual ~_PITimerBase() {stop();}
+	virtual ~_PITimerBase() {stop(true);}
 	
 	double interval() const {return interval_;}
 	void setInterval(double i);
@@ -52,7 +52,7 @@ public:
 	void startDeferred(PIDateTime start_datetime) {startDeferred(interval_, start_datetime);}
 	void startDeferred(double interval_ms, PIDateTime start_datetime);
 	
-	bool stop();
+	bool stop(bool wait);
 	
 	typedef void(*TickFunc)(PITimer*);
 	TickFunc tfunc;
@@ -61,7 +61,7 @@ public:
 protected:
 	
 	virtual bool startTimer(double interval_ms) = 0;
-	virtual bool stopTimer() = 0;
+	virtual bool stopTimer(bool wait) = 0;
 	
 	double interval_, deferred_delay;
 	bool deferred_, deferred_mode; // mode: true - date, false - delay
@@ -117,7 +117,7 @@ public:
 	EVENT_HANDLER0(bool, start) {return imp->start();}
 	EVENT_HANDLER1(bool, start, double, interval_ms_d) {setInterval(interval_ms_d); return imp->start(interval_ms_d);}
 	bool start(int interval_ms_i) {setInterval(double(interval_ms_i)); return imp->start(double(interval_ms_i));}
-	EVENT_HANDLER0(bool, restart) {imp->stop(); return imp->start();}
+	EVENT_HANDLER0(bool, restart) {imp->stop(true); return imp->start();}
 
 
 	/** \brief Start timer with \b interval() loop delay after \b delay_msecs delay.
@@ -140,7 +140,8 @@ public:
 	 * \b interval_msecs loop delay. */
 	void startDeferred(double interval_ms, PIDateTime start_datetime) {imp->startDeferred(interval_ms, start_datetime);}
 	
-	EVENT_HANDLER0(bool, stop) {return imp->stop();}
+	EVENT_HANDLER0(bool, stop) {return imp->stop(true);}
+	EVENT_HANDLER1(bool, stop, bool, wait) {return imp->stop(wait);}
 	bool waitForFinish() {return waitForFinish(-1);}
 	bool waitForFinish(int timeout_msecs);
 	
@@ -194,8 +195,8 @@ public:
 	//! \fn bool restart()
 	//! \brief Stop and start timer with \a interval() loop delay
 	
-	//! \fn bool stop()
-	//! \brief Stop timer
+	//! \fn bool stop(bool wait = true)
+	//! \brief Stop timer and wait for it finish if "wait"
 	
 	//! \fn void clearDelimiters()
 	//! \brief Remove all frequency delimiters