Fix a number of threading problems and crashes

This partially resolves Bug 1467

7 files changed, 757 insertions, 305 deletions

diff --git a/src/kernel/qapplication.cpp b/src/kernel/qapplication.cpp
index 620f5df..fb531cb 100644
--- a/src/kernel/qapplication.cpp
+++ b/src/kernel/qapplication.cpp
@@ -600,8 +600,9 @@ static QPostEventList *globalPostedEvents = 0;	// list of posted events
 
 uint qGlobalPostedEventsCount()
 {
-    if (!globalPostedEvents)
+    if (!globalPostedEvents) {
 	return 0;
+    }
     return globalPostedEvents->count();
 }
 
@@ -2413,8 +2414,9 @@ void QApplication::aboutQt()
 bool QApplication::notify( QObject *receiver, QEvent *e )
 {
     // no events are delivered after ~QApplication() has started
-    if ( is_app_closing )
+    if ( is_app_closing ) {
 	return FALSE;
+    }
 
     if ( receiver == 0 ) {			// serious error
 #if defined(QT_CHECK_NULL)
@@ -2456,8 +2458,9 @@ bool QApplication::notify( QObject *receiver, QEvent *e )
     }
 
     bool res = FALSE;
-    if ( !receiver->isWidgetType() )
+    if ( !receiver->isWidgetType() ) {
 	res = internalNotify( receiver, e );
+    }
     else switch ( e->type() ) {
 #ifndef QT_NO_ACCEL
     case QEvent::Accel:
@@ -2465,13 +2468,15 @@ bool QApplication::notify( QObject *receiver, QEvent *e )
 	    QKeyEvent* key = (QKeyEvent*) e;
 	    res = internalNotify( receiver, e );
 
-	    if ( !res && !key->isAccepted() )
+	    if ( !res && !key->isAccepted() ) {
 		res = qt_dispatchAccelEvent( (QWidget*)receiver, key );
+	    }
 
 	    // next lines are for compatibility with Qt <= 3.0.x: old
 	    // QAccel was listening on toplevel widgets
-	    if ( !res && !key->isAccepted() && !((QWidget*)receiver)->isTopLevel() )
+	    if ( !res && !key->isAccepted() && !((QWidget*)receiver)->isTopLevel() ) {
 		res = internalNotify( ((QWidget*)receiver)->topLevelWidget(), e );
+	    }
 	}
     break;
 #endif //QT_NO_ACCEL
@@ -3275,8 +3280,9 @@ void QApplication::postEvent( QObject *receiver, QEvent *event )
 	qapp_cleanup_events.set( &globalPostedEvents );
     }
 
-    if ( !receiver->postedEvents )
+    if ( !receiver->postedEvents ) {
 	receiver->postedEvents = new QPostEventList;
+    }
     QPostEventList * l = receiver->postedEvents;
 
     // if this is one of the compressible events, do compression
@@ -3374,8 +3380,9 @@ void QApplication::postEvent( QObject *receiver, QEvent *event )
     }
 #endif
 
-    if (currentEventLoop())
+    if (currentEventLoop()) {
 	currentEventLoop()->wakeUp();
+    }
 }
 
 
@@ -3406,22 +3413,25 @@ void QApplication::sendPostedEvents( QObject *receiver, int event_type )
 {
     // Make sure the object hierarchy is stable before processing events
     // to avoid endless loops
-    if ( receiver == 0 && event_type == 0 )
+    if ( receiver == 0 && event_type == 0 ) {
 	sendPostedEvents( 0, QEvent::ChildInserted );
-
-    if ( !globalPostedEvents || ( receiver && !receiver->postedEvents ) )
-	return;
+    }
 
 #ifdef QT_THREAD_SUPPORT
     QMutexLocker locker( postevent_mutex );
 #endif
 
+    if ( !globalPostedEvents || ( receiver && !receiver->postedEvents ) ) {
+	return;
+    }
+
     bool sent = TRUE;
     while ( sent ) {
 	sent = FALSE;
 
-	if ( !globalPostedEvents || ( receiver && !receiver->postedEvents ) )
+	if ( !globalPostedEvents || ( receiver && !receiver->postedEvents ) ) {
 	    return;
+	}
 
 	// if we have a receiver, use the local list. Otherwise, use the
 	// global list
@@ -3438,7 +3448,7 @@ void QApplication::sendPostedEvents( QObject *receiver, int event_type )
 		      || receiver == pe->receiver ) // we send to THAT receiver
 		 && ( event_type == 0 // we send all types
 		      || event_type == pe->event->type() ) // we send THAT type
-		 && ( (!pe->receiver) || (pe->receiver->contextThreadObject() == QThread::currentThreadObject()) ) ) { // only send if active thread is receiver object owning thread
+		 && ( (!pe->receiver) || ((pe->receiver) && (!pe->receiver->wasDeleted) && (pe->receiver->contextThreadObject() == QThread::currentThreadObject())) ) ) { // only send if active thread is receiver object owning thread
 		// first, we diddle the event so that we can deliver
 		// it, and that noone will try to touch it later.
 		pe->event->posted = FALSE;
@@ -3471,8 +3481,9 @@ void QApplication::sendPostedEvents( QObject *receiver, int event_type )
 		if ( e->type() == QEvent::Paint && r->isWidgetType() ) {
 		    QWidget * w = (QWidget*)r;
 		    QPaintEvent * p = (QPaintEvent*)e;
-		    if ( w->isVisible() )
+		    if ( w->isVisible() ) {
 			w->repaint( p->reg, p->erase );
+		    }
 		} else {
 		    sent = TRUE;
 		    QApplication::sendEvent( r, e );
@@ -3493,10 +3504,12 @@ void QApplication::sendPostedEvents( QObject *receiver, int event_type )
 	if ( l == globalPostedEvents ) {
 	    globalPostedEvents->first();
 	    while( (pe=globalPostedEvents->current()) != 0 ) {
-		if ( pe->event )
+		if ( pe->event ) {
 		    globalPostedEvents->next();
-		else
+		}
+		else {
 		    globalPostedEvents->remove();
+		}
 	    }
 	}
     }
diff --git a/src/kernel/qeventloop_glib_p.h b/src/kernel/qeventloop_glib_p.h
index 4dfc02c..d8fa15d 100644
--- a/src/kernel/qeventloop_glib_p.h
+++ b/src/kernel/qeventloop_glib_p.h
@@ -75,8 +75,8 @@ class QSocketNotifier;
 
 struct QSockNotGPollFD
 {
-    QSocketNotifier *obj;
-    GPollFD gPollFD; 
+	QSocketNotifier *obj;
+	GPollFD gPollFD; 
 	gushort events;  // save events
 	bool pending;
 };
@@ -84,25 +84,10 @@ struct QSockNotGPollFD
 class QEventLoopPrivate
 {
 public:
-	QEventLoopPrivate()
-	{
-#if defined(Q_WS_X11)
-		xfd = -1;
-		x_gPollFD.fd = -1;
-#endif // Q_WS_X11
-		singletoolkit = TRUE;
-		ctx = 0;
-		ctx_is_default = false;
-		reset();
-	}
-
-	void reset() {
-		looplevel = 0;
-		quitcode = 0;
-		quitnow = FALSE;
-		exitloop = FALSE;
-		shortcut = FALSE;
-	}
+	QEventLoopPrivate();
+	~QEventLoopPrivate();
+
+	void reset();
 
 	int looplevel;
 	int quitcode;
diff --git a/src/kernel/qeventloop_unix_glib.cpp b/src/kernel/qeventloop_unix_glib.cpp
index 6a890ce..1c491cf 100644
--- a/src/kernel/qeventloop_unix_glib.cpp
+++ b/src/kernel/qeventloop_unix_glib.cpp
@@ -45,6 +45,11 @@
 #include "qapplication.h"
 #include "qbitarray.h"
 #include "qmutex.h"
+
+#if defined(QT_THREAD_SUPPORT)
+  #include "qthread.h"
+#endif
+
 #include <stdlib.h>
 #include <sys/types.h>
 
@@ -87,22 +92,25 @@
 //
 
 struct TimerInfo {				// internal timer info
-    int	     id;				// - timer identifier
-    timeval  interval;				// - timer interval
-    timeval  timeout;				// - when to sent event
-    QObject *obj;				// - object to receive event
+	int	 id;				// - timer identifier
+	timeval  interval;			// - timer interval
+	timeval  timeout;			// - when to sent event
+	QObject *obj;				// - object to receive event
 };
 
-typedef QPtrList<TimerInfo> TimerList;	// list of TimerInfo structs
+typedef QPtrList<TimerInfo> TimerList;		// list of TimerInfo structs
 
 static QBitArray *timerBitVec;			// timer bit vector
-static TimerList *timerList	= 0;		// timer list
+static TimerList  *timerList = 0;		// timer list
+#if defined(QT_THREAD_SUPPORT)
+static QMutex    *timerListMutex = 0;		// timer list mutex
+#endif
 
-static void	initTimers();
+static void initTimers();
 void cleanupTimers();
-static timeval	watchtime;			// watch if time is turned back
-timeval		*qt_wait_timer();
-timeval	*qt_wait_timer_max = 0;
+static timeval watchtime;			// watch if time is turned back
+timeval *qt_wait_timer();
+timeval *qt_wait_timer_max = 0;
 
 //
 // Internal operator functions for timevals
@@ -110,45 +118,44 @@ timeval	*qt_wait_timer_max = 0;
 
 static inline bool operator<( const timeval &t1, const timeval &t2 )
 {
-    return t1.tv_sec < t2.tv_sec ||
-	  (t1.tv_sec == t2.tv_sec && t1.tv_usec < t2.tv_usec);
+	return (t1.tv_sec < t2.tv_sec) || ((t1.tv_sec == t2.tv_sec) && (t1.tv_usec < t2.tv_usec));
 }
 
 static inline bool operator==( const timeval &t1, const timeval &t2 )
 {
-    return t1.tv_sec == t2.tv_sec && t1.tv_usec == t2.tv_usec;
+	return t1.tv_sec == t2.tv_sec && t1.tv_usec == t2.tv_usec;
 }
 
 static inline timeval &operator+=( timeval &t1, const timeval &t2 )
 {
-    t1.tv_sec += t2.tv_sec;
-    if ( (t1.tv_usec += t2.tv_usec) >= 1000000 ) {
-	t1.tv_sec++;
-	t1.tv_usec -= 1000000;
-    }
-    return t1;
+	t1.tv_sec += t2.tv_sec;
+	if ( (t1.tv_usec += t2.tv_usec) >= 1000000 ) {
+		t1.tv_sec++;
+		t1.tv_usec -= 1000000;
+	}
+	return t1;
 }
 
 static inline timeval operator+( const timeval &t1, const timeval &t2 )
 {
-    timeval tmp;
-    tmp.tv_sec = t1.tv_sec + t2.tv_sec;
-    if ( (tmp.tv_usec = t1.tv_usec + t2.tv_usec) >= 1000000 ) {
-	tmp.tv_sec++;
-	tmp.tv_usec -= 1000000;
-    }
-    return tmp;
+	timeval tmp;
+	tmp.tv_sec = t1.tv_sec + t2.tv_sec;
+	if ( (tmp.tv_usec = t1.tv_usec + t2.tv_usec) >= 1000000 ) {
+		tmp.tv_sec++;
+		tmp.tv_usec -= 1000000;
+	}
+	return tmp;
 }
 
 static inline timeval operator-( const timeval &t1, const timeval &t2 )
 {
-    timeval tmp;
-    tmp.tv_sec = t1.tv_sec - t2.tv_sec;
-    if ( (tmp.tv_usec = t1.tv_usec - t2.tv_usec) < 0 ) {
-	tmp.tv_sec--;
-	tmp.tv_usec += 1000000;
-    }
-    return tmp;
+	timeval tmp;
+	tmp.tv_sec = t1.tv_sec - t2.tv_sec;
+	if ( (tmp.tv_usec = t1.tv_usec - t2.tv_usec) < 0 ) {
+		tmp.tv_sec--;
+		tmp.tv_usec += 1000000;
+	}
+	return tmp;
 }
 
 
@@ -159,68 +166,84 @@ static inline timeval operator-( const timeval &t1, const timeval &t2 )
 
 static int allocTimerId()			// find avail timer identifier
 {
-    int i = timerBitVec->size()-1;
-    while ( i >= 0 && (*timerBitVec)[i] )
-	i--;
-    if ( i < 0 ) {
-	i = timerBitVec->size();
-	timerBitVec->resize( 4 * i );
-	for( int j=timerBitVec->size()-1; j > i; j-- )
-	    timerBitVec->clearBit( j );
-    }
-    timerBitVec->setBit( i );
-    return i+1;
+	int i = timerBitVec->size()-1;
+	while ( i >= 0 && (*timerBitVec)[i] ) {
+		i--;
+	}
+	if ( i < 0 ) {
+		i = timerBitVec->size();
+		timerBitVec->resize( 4 * i );
+		for( int j=timerBitVec->size()-1; j > i; j-- ) {
+			timerBitVec->clearBit( j );
+		}
+	}
+	timerBitVec->setBit( i );
+	return i+1;
 }
 
-static void insertTimer( const TimerInfo *ti )	// insert timer info into list
+static void insertTimer( const TimerInfo *ti )				// insert timer info into list
 {
-    TimerInfo *t = timerList->first();
-    int index = 0;
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->lock();
+#endif
+	TimerInfo *t = timerList->first();
+	int index = 0;
 #if defined(QT_DEBUG)
-    int dangerCount = 0;
+	int dangerCount = 0;
 #endif
-    while ( t && t->timeout < ti->timeout ) {	// list is sorted by timeout
+	while ( t && t->timeout < ti->timeout ) {			// list is sorted by timeout
 #if defined(QT_DEBUG)
-	if ( t->obj == ti->obj )
-	    dangerCount++;
+		if ( t->obj == ti->obj ) {
+			dangerCount++;
+		}
 #endif
-	t = timerList->next();
-	index++;
-    }
-    timerList->insert( index, ti );		// inserts sorted
+		t = timerList->next();
+		index++;
+	}
+	timerList->insert( index, ti );					// inserts sorted
 #if defined(QT_DEBUG)
-    if ( dangerCount > 16 )
-	qDebug( "QObject: %d timers now exist for object %s::%s",
-	       dangerCount, ti->obj->className(), ti->obj->name() );
+	if ( dangerCount > 16 ) {
+		qDebug( "QObject: %d timers now exist for object %s::%s", dangerCount, ti->obj->className(), ti->obj->name() );
+	}
+#endif
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->unlock();
 #endif
 }
 
-static inline void getTime( timeval &t )	// get time of day
+static inline void getTime( timeval &t )				// get time of day
 {
-    gettimeofday( &t, 0 );
-    while ( t.tv_usec >= 1000000 ) {		// NTP-related fix
-	t.tv_usec -= 1000000;
-	t.tv_sec++;
-    }
-    while ( t.tv_usec < 0 ) {
-	if ( t.tv_sec > 0 ) {
-	    t.tv_usec += 1000000;
-	    t.tv_sec--;
-	} else {
-	    t.tv_usec = 0;
-	    break;
+	gettimeofday( &t, 0 );
+	while ( t.tv_usec >= 1000000 ) {				// NTP-related fix
+		t.tv_usec -= 1000000;
+		t.tv_sec++;
+	}
+	while ( t.tv_usec < 0 ) {
+		if ( t.tv_sec > 0 ) {
+			t.tv_usec += 1000000;
+			t.tv_sec--;
+		}
+		else {
+			t.tv_usec = 0;
+			break;
+		}
 	}
-    }
 }
 
-static void repairTimer( const timeval &time )	// repair broken timer
+static void repairTimer( const timeval &time )				// repair broken timer
 {
-    timeval diff = watchtime - time;
-    register TimerInfo *t = timerList->first();
-    while ( t ) {				// repair all timers
-	t->timeout = t->timeout - diff;
-	t = timerList->next();
-    }
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->lock();
+#endif
+	timeval diff = watchtime - time;
+	register TimerInfo *t = timerList->first();
+	while ( t ) {							// repair all timers
+		t->timeout = t->timeout - diff;
+		t = timerList->next();
+	}
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->unlock();
+#endif
 }
 
 //
@@ -236,117 +259,186 @@ static void repairTimer( const timeval &time )	// repair broken timer
 
 timeval *qt_wait_timer()
 {
-    static timeval tm;
-    bool first = TRUE;
-    timeval currentTime;
-    if ( timerList && timerList->count() ) {	// there are waiting timers
-	getTime( currentTime );
-	if ( first ) {
-	    if ( currentTime < watchtime )	// clock was turned back
-		repairTimer( currentTime );
-	    first = FALSE;
-	    watchtime = currentTime;
+#if defined(QT_THREAD_SUPPORT)
+	if (timerListMutex) timerListMutex->lock();
+#endif
+	static timeval tm;
+	bool first = TRUE;
+	timeval currentTime;
+	if ( timerList && timerList->count() ) {			// there are waiting timers
+		getTime( currentTime );
+		if ( first ) {
+			if ( currentTime < watchtime ) {		// clock was turned back
+				repairTimer( currentTime );
+			}
+			first = FALSE;
+			watchtime = currentTime;
+		}
+		TimerInfo *t = timerList->first();			// first waiting timer
+		if ( currentTime < t->timeout ) {			// time to wait
+			tm = t->timeout - currentTime;
+		}
+		else {
+			tm.tv_sec  = 0;					// no time to wait
+			tm.tv_usec = 0;
+		}
+		if ( qt_wait_timer_max && *qt_wait_timer_max < tm ) {
+			tm = *qt_wait_timer_max;
+		}
+#if defined(QT_THREAD_SUPPORT)
+		if (timerListMutex) timerListMutex->unlock();
+#endif
+		return &tm;
 	}
-	TimerInfo *t = timerList->first();	// first waiting timer
-	if ( currentTime < t->timeout ) {	// time to wait
-	    tm = t->timeout - currentTime;
-	} else {
-	    tm.tv_sec  = 0;			// no time to wait
-	    tm.tv_usec = 0;
+	if ( qt_wait_timer_max ) {
+		tm = *qt_wait_timer_max;
+#if defined(QT_THREAD_SUPPORT)
+		if (timerListMutex) timerListMutex->unlock();
+#endif
+		return &tm;
 	}
-	if ( qt_wait_timer_max && *qt_wait_timer_max < tm )
-	    tm = *qt_wait_timer_max;
-	return &tm;
-    }
-    if ( qt_wait_timer_max ) {
-	tm = *qt_wait_timer_max;
-	return &tm;
-    }
-    return 0;					// no timers
+#if defined(QT_THREAD_SUPPORT)
+	if (timerListMutex) timerListMutex->unlock();
+#endif
+	return 0;							// no timers
 }
 
 // Timer initialization
-static void initTimers()			// initialize timers
+static void initTimers()						// initialize timers
 {
-    timerBitVec = new QBitArray( 128 );
-    Q_CHECK_PTR( timerBitVec );
-    int i = timerBitVec->size();
-    while( i-- > 0 )
-	    timerBitVec->clearBit( i );
-    timerList = new TimerList;
-    Q_CHECK_PTR( timerList );
-    timerList->setAutoDelete( TRUE );
-    gettimeofday( &watchtime, 0 );
+	timerBitVec = new QBitArray( 128 );
+	Q_CHECK_PTR( timerBitVec );
+	int i = timerBitVec->size();
+	while( i-- > 0 ) {
+		timerBitVec->clearBit( i );
+	}
+	timerList = new TimerList;
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex = new QMutex(true);
+#endif
+	Q_CHECK_PTR( timerList );
+	timerList->setAutoDelete( TRUE );
+	gettimeofday( &watchtime, 0 );
 }
 
 // Timer cleanup
 void cleanupTimers()
 {
-    delete timerList;
-    timerList = 0;
-    delete timerBitVec;
-    timerBitVec = 0;
+	delete timerList;
+	timerList = 0;
+	delete timerBitVec;
+	timerBitVec = 0;
+#if defined(QT_THREAD_SUPPORT)
+	delete timerListMutex;
+	timerListMutex = 0;
+#endif
 }
 
 // Main timer functions for starting and killing timers
 int qStartTimer( int interval, QObject *obj )
 {
-    if ( !timerList )				// initialize timer data
-	initTimers();
-    int id = allocTimerId();			// get free timer id
-    if ( id <= 0 ||
-	 id > (int)timerBitVec->size() || !obj )// cannot create timer
-	return 0;
-    timerBitVec->setBit( id-1 );		// set timer active
-    TimerInfo *t = new TimerInfo;		// create timer
-    Q_CHECK_PTR( t );
-    t->id = id;
-    t->interval.tv_sec  = interval/1000;
-    t->interval.tv_usec = (interval%1000)*1000;
-    timeval currentTime;
-    getTime( currentTime );
-    t->timeout = currentTime + t->interval;
-    t->obj = obj;
-    insertTimer( t );				// put timer in list
-    return id;
+	if ( !timerList ) {						// initialize timer data
+		initTimers();
+	}
+	int id = allocTimerId();					// get free timer id
+	if ( (id <= 0) || (id > (int)timerBitVec->size()) || (!obj) ) {	// cannot create timer
+		return 0;
+	}
+	timerBitVec->setBit( id-1 );					// set timer active
+	TimerInfo *t = new TimerInfo;					// create timer
+	Q_CHECK_PTR( t );
+	t->id = id;
+	t->interval.tv_sec  = interval/1000;
+	t->interval.tv_usec = (interval%1000)*1000;
+	timeval currentTime;
+	getTime( currentTime );
+	t->timeout = currentTime + t->interval;
+	t->obj = obj;
+	insertTimer( t );						// put timer in list
+	return id;
 }
 
 bool qKillTimer( int id )
 {
-    register TimerInfo *t;
-    if ( !timerList || id <= 0 ||
-	 id > (int)timerBitVec->size() || !timerBitVec->testBit( id-1 ) )
-	return FALSE;				// not init'd or invalid timer
-    t = timerList->first();
-    while ( t && t->id != id )			// find timer info in list
-	t = timerList->next();
-    if ( t ) {					// id found
-	timerBitVec->clearBit( id-1 );		// set timer inactive
-	return timerList->remove();
-    }
-    else					// id not found
-	return FALSE;
+	register TimerInfo *t;
+	if ( (!timerList) || (id <= 0) || (id > (int)timerBitVec->size()) || (!timerBitVec->testBit( id-1 )) ) {
+		return FALSE;						// not init'd or invalid timer
+	}
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->lock();
+#endif
+	t = timerList->first();
+	while ( t && t->id != id ) {					// find timer info in list
+		t = timerList->next();
+	}
+	if ( t ) {							// id found
+		bool ret;
+		timerBitVec->clearBit( id-1 );				// set timer inactive
+		ret = timerList->remove();
+#if defined(QT_THREAD_SUPPORT)
+		timerListMutex->unlock();
+#endif
+		return ret;
+	}
+	else {								// id not found
+#if defined(QT_THREAD_SUPPORT)
+		timerListMutex->unlock();
+#endif
+		return FALSE;
+	}
 }
 
 bool qKillTimer( QObject *obj )
 {
-    register TimerInfo *t;
-    if ( !timerList )				// not initialized
-	return FALSE;
-    t = timerList->first();
-    while ( t ) {				// check all timers
-	if ( t->obj == obj ) {			// object found
-	    timerBitVec->clearBit( t->id-1 );
-	    timerList->remove();
-	    t = timerList->current();
-	} else {
-	    t = timerList->next();
+	register TimerInfo *t;
+	if ( !timerList ) {						// not initialized
+		return FALSE;
 	}
-    }
-    return TRUE;
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->lock();
+#endif
+	t = timerList->first();
+	while ( t ) {							// check all timers
+		if ( t->obj == obj ) {					// object found
+			timerBitVec->clearBit( t->id-1 );
+			timerList->remove();
+			t = timerList->current();
+		}
+		else {
+			t = timerList->next();
+		}
+	}
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->unlock();
+#endif
+	return TRUE;
 }
 
 
+QEventLoopPrivate::QEventLoopPrivate() {
+#if defined(Q_WS_X11)
+	xfd = -1;
+	x_gPollFD.fd = -1;
+	x_gPollFD.events = 0;
+	x_gPollFD.revents = 0;
+#endif // Q_WS_X11
+	singletoolkit = TRUE;
+	ctx = 0;
+	ctx_is_default = false;
+	reset();
+}
+
+QEventLoopPrivate::~QEventLoopPrivate() {
+	//
+}
+
+void QEventLoopPrivate::reset() {
+	looplevel = 0;
+	quitcode = 0;
+	quitnow = FALSE;
+	exitloop = FALSE;
+	shortcut = FALSE;
+}
 
 
 /*****************************************************************************
@@ -358,9 +450,6 @@ bool qKillTimer( QObject *obj )
  
 void QEventLoop::registerSocketNotifier( QSocketNotifier *notifier )
 {
-	
-	
-	
     int sockfd = notifier->socket();
     int type = notifier->type();
     if ( sockfd < 0 || type < 0 || type > 2 || notifier == 0 ) {
@@ -378,13 +467,13 @@ void QEventLoop::registerSocketNotifier( QSocketNotifier *notifier )
     QSockNotGPollFD *sn;
 
 	/*
-    if ( ! list ) {
-        // create new list, the QSockNotType destructor will delete it for us
+	if ( ! list ) {
+		// create new list, the QSockNotType destructor will delete it for us
 		list = new QPtrList<QSockNot>;
 		Q_CHECK_PTR( list );
 		list->setAutoDelete( TRUE );
 		d->sn_list = list;
-    }
+	}
 	*/
 	
 	gushort events=0;
@@ -400,10 +489,10 @@ void QEventLoop::registerSocketNotifier( QSocketNotifier *notifier )
 			break;
 	}
 	
-    sn = new QSockNotGPollFD;
-    Q_CHECK_PTR( sn );
-    sn->obj = notifier;
-    sn->gPollFD.fd = sockfd;
+	sn = new QSockNotGPollFD;
+	Q_CHECK_PTR( sn );
+	sn->obj = notifier;
+	sn->gPollFD.fd = sockfd;
 	sn->gPollFD.events = events; 
 	sn->events = events; // save events!
 	sn->pending = FALSE;
@@ -429,21 +518,24 @@ void QEventLoop::unregisterSocketNotifier( QSocketNotifier *notifier )
 	printf("unregister socket notifier %d\n", sockfd);
 #endif	
 
-    QPtrList<QSockNotGPollFD> *list = &d->sn_list;
-    QSockNotGPollFD *sn;
-    if ( ! list )
-         return;
-    sn = list->first();
-    while ( sn && !(sn->obj == notifier) )
-        sn = list->next();
-    if ( !sn ) // not found
-        return;
-
+	QPtrList<QSockNotGPollFD> *list = &d->sn_list;
+	QSockNotGPollFD *sn;
+	if ( ! list ) {
+		return;
+	}
+	sn = list->first();
+	while ( sn && !(sn->obj == notifier) ) {
+		sn = list->next();
+	}
+	if ( !sn ) {					// not found
+		return;
+	}
+	
 	d->sn_pending_list.removeRef( sn );	
-    list->remove();				// remove notifier found above
+	list->remove();					// remove notifier found above
 	g_source_remove_poll(d->gSource, &sn->gPollFD);
 	
-	delete sn;  // we don't autodelete - lets do it manually
+	delete sn;					// we don't autodelete - lets do it manually
 	
 }
 
@@ -514,62 +606,95 @@ void QEventLoop::wakeUp()
 
 int QEventLoop::timeToWait() const
 {
-    timeval *tm = qt_wait_timer();
-    if ( ! tm )	// no active timers
-	return -1;
-    return (tm->tv_sec*1000) + (tm->tv_usec/1000);
+	timeval *tm = qt_wait_timer();
+	if ( !tm ) {			// no active timers
+		return -1;
+	}
+	return (tm->tv_sec*1000) + (tm->tv_usec/1000);
 }
 
 int QEventLoop::activateTimers()
 {
-    if ( !timerList || !timerList->count() )	// no timers
-	return 0;
-    bool first = TRUE;
-    timeval currentTime;
-    int n_act = 0, maxCount = timerList->count();
-    TimerInfo *begin = 0;
-    register TimerInfo *t;
-
-    for ( ;; ) {
-	if ( ! maxCount-- )
-	    break;
-	getTime( currentTime );			// get current time
-	if ( first ) {
-	    if ( currentTime < watchtime )	// clock was turned back
-		repairTimer( currentTime );
-	    first = FALSE;
-	    watchtime = currentTime;
+	if ( !timerList || !timerList->count() ) {		// no timers
+		return 0;
 	}
-	t = timerList->first();
-	if ( !t || currentTime < t->timeout )	// no timer has expired
-	    break;
-	if ( ! begin ) {
-	    begin = t;
-	} else if ( begin == t ) {
-	    // avoid sending the same timer multiple times
-	    break;
-	} else if ( t->interval <  begin->interval || t->interval == begin->interval ) {
-	    begin = t;
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->lock();
+#endif
+	bool first = TRUE;
+	timeval currentTime;
+	int n_act = 0, maxCount = timerList->count();
+	TimerInfo *begin = 0;
+	register TimerInfo *t;
+	
+	for ( ;; ) {
+		if ( ! maxCount-- ) {
+			break;
+		}
+		getTime( currentTime );				// get current time
+		if ( first ) {
+			if ( currentTime < watchtime ) {	// clock was turned back
+				repairTimer( currentTime );
+			}
+			first = FALSE;
+			watchtime = currentTime;
+		}
+		t = timerList->first();
+		if ( !t || currentTime < t->timeout ) {		// no timer has expired
+			break;
+		}
+		if ( ! begin ) {
+			begin = t;
+		}
+		else if ( begin == t ) {
+			// avoid sending the same timer multiple times
+			break;
+		}
+		else if ( t->interval <  begin->interval || t->interval == begin->interval ) {
+			begin = t;
+		}
+		timerList->take();				// unlink from list
+		t->timeout += t->interval;
+		if ( t->timeout < currentTime ) {
+			t->timeout = currentTime + t->interval;
+		}
+		insertTimer( t );				// relink timer
+		if ( t->interval.tv_usec > 0 || t->interval.tv_sec > 0 ) {
+			n_act++;
+		}
+#if defined(QT_THREAD_SUPPORT)
+		timerListMutex->unlock();
+#endif
+		QTimerEvent e( t->id );
+#if defined(QT_THREAD_SUPPORT)
+		// Be careful...the current thread may not be the target object's thread!
+		if ((!t->obj) || (t->obj && (t->obj->contextThreadObject() == QThread::currentThreadObject()))) {
+			QApplication::sendEvent( t->obj, &e );				// send event
+		}
+		else {
+			QApplication::postEvent( t->obj, new QTimerEvent(e) );	// post event to correct thread
+		}
+#else // defined(QT_THREAD_SUPPORT)
+		QApplication::sendEvent( t->obj, &e );					// send event
+#endif // defined(QT_THREAD_SUPPORT)
+#if defined(QT_THREAD_SUPPORT)
+		timerListMutex->lock();
+#endif
+		if ( timerList->findRef( begin ) == -1 ) {
+			begin = 0;
+		}
 	}
-	timerList->take();			// unlink from list
-	t->timeout += t->interval;
-	if ( t->timeout < currentTime )
-	    t->timeout = currentTime + t->interval;
-	insertTimer( t );			// relink timer
-	if ( t->interval.tv_usec > 0 || t->interval.tv_sec > 0 )
-	    n_act++;
-	QTimerEvent e( t->id );
-	QApplication::sendEvent( t->obj, &e );	// send event
-	if ( timerList->findRef( begin ) == -1 )
-	    begin = 0;
-    }
-    return n_act;
+#if defined(QT_THREAD_SUPPORT)
+	timerListMutex->unlock();
+#endif
+	return n_act;
 }
 
 int QEventLoop::activateSocketNotifiers()
 {
-    if ( d->sn_pending_list.isEmpty() )
-	    return 0;
+    if ( d->sn_pending_list.isEmpty() ) {
+	return 0;
+    }
 
     // activate entries
     int n_act = 0;
@@ -584,7 +709,17 @@ int QEventLoop::activateSocketNotifiers()
 		printf("activate sn  : send event fd=%d\n", sn->gPollFD.fd );
 #endif	
 		sn->pending = FALSE;
-		QApplication::sendEvent( sn->obj, &event );
+#if defined(QT_THREAD_SUPPORT)
+		// Be careful...the current thread may not be the target object's thread!
+		if ((!sn->obj) || (sn->obj && (sn->obj->contextThreadObject() == QThread::currentThreadObject()))) {
+			QApplication::sendEvent( sn->obj, &event );			// send event
+		}
+		else {
+			QApplication::postEvent( sn->obj, new QEvent(event) );	// post event to correct thread
+		}
+#else // defined(QT_THREAD_SUPPORT)
+		QApplication::sendEvent( sn->obj, &event );				// send event
+#endif // defined(QT_THREAD_SUPPORT)
 		n_act++;
 	}
     }
diff --git a/src/kernel/qeventloop_x11_glib.cpp b/src/kernel/qeventloop_x11_glib.cpp
index d37fbee..5226aa9 100644
--- a/src/kernel/qeventloop_x11_glib.cpp
+++ b/src/kernel/qeventloop_x11_glib.cpp
@@ -484,8 +484,9 @@ bool QEventLoop::gsourceCheck(GSource *gs) {
 	//if ( list ) {
 		QSockNotGPollFD *sn = list->first();
 		while ( sn ) {
-			if ( sn->gPollFD.revents )
+			if ( sn->gPollFD.revents ) {
 				return TRUE;
+			}
 			sn = list->next();
 		}
 	//}
@@ -513,7 +514,7 @@ bool QEventLoop::gsourceCheck(GSource *gs) {
 	}
 
 	// check if we have timers to activate?
-	timeval * tm =qt_wait_timer();
+	timeval * tm = qt_wait_timer();
 	if (tm && (tm->tv_sec == 0 && tm->tv_usec == 0 )) {
 #ifdef DEBUG_QT_GLIBMAINLOOP
 		printf("inside gsourceCheck(2) qtwaittimer!\n");
@@ -582,14 +583,18 @@ bool QEventLoop::gsourceDispatch(GSource *gs) {
 				sn = list->next();
 			}
 		// }
-	
-		nevents += activateSocketNotifiers();
+
+		if (QApplication::isGuiThread()) {
+			nevents += activateSocketNotifiers();
+		}
 	}
 
 	// activate timers
 	if ( ! ( flags & 0x08 ) ) {
 		// 0x08 == ExcludeTimers for X11 only
-		nevents += activateTimers();
+		if (QApplication::isGuiThread()) {
+			nevents += activateTimers();
+		}
 	}
 
 	// return true if we handled events, false otherwise
diff --git a/src/kernel/qobject.cpp b/src/kernel/qobject.cpp
index 13486f4..20973c5 100644
--- a/src/kernel/qobject.cpp
+++ b/src/kernel/qobject.cpp
@@ -610,11 +610,13 @@ QObject::~QObject()
     blockSig = 0; // unblock signals to keep QGuardedPtr happy
     emit destroyed( this );
     emit destroyed();
-    if ( objname )
+    if ( objname ) {
 	delete [] (char*)objname;
+    }
     objname = 0;
-    if ( pendTimer )				// might be pending timers
+    if ( pendTimer ) {				// might be pending timers
 	qKillTimer( this );
+    }
     QApplication::removePostedEvents( this );
     if ( isTree ) {
 	remove_tree( this );		// remove from global root list
@@ -924,12 +926,17 @@ void destroyDeepCopiedQUObjectArray(QUObject* uArray)
 bool QObject::event( QEvent *e )
 {
 #if defined(QT_CHECK_NULL)
-    if ( e == 0 )
+    if ( e == 0 ) {
 	qWarning( "QObject::event: Null events are not permitted" );
+    }
 #endif
+    if ( wasDeleted ) {
+	return TRUE;
+    }
     if ( eventFilters ) {			// try filters
-	if ( activate_filters(e) )		// stopped by a filter
+	if ( activate_filters(e) ) {		// stopped by a filter
 	    return TRUE;
+	}
     }
 
     switch ( e->type() ) {
diff --git a/src/tools/qglist.cpp b/src/tools/qglist.cpp
index b04ac75..fb94427 100644
--- a/src/tools/qglist.cpp
+++ b/src/tools/qglist.cpp
@@ -43,6 +43,10 @@
 #include "qdatastream.h"
 #include "qvaluelist.h"
 
+#if defined(QT_THREAD_SUPPORT)
+  #include "qmutex.h"
+#endif // defined(QT_THREAD_SUPPORT)
+
 /*!
   \class QLNode qglist.h
   \reentrant
@@ -221,6 +225,9 @@ QDataStream &QGList::write( QDataStream &s, QPtrCollection::Item ) const
 
 QGList::QGList()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex = new QMutex(true);
+#endif
     firstNode = lastNode = curNode = 0;		// initialize list
     numNodes  = 0;
     curIndex  = -1;
@@ -234,6 +241,9 @@ QGList::QGList()
 QGList::QGList( const QGList & list )
     : QPtrCollection( list )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex = new QMutex(true);
+#endif
     firstNode = lastNode = curNode = 0;		// initialize list
     numNodes  = 0;
     curIndex  = -1;
@@ -258,6 +268,9 @@ QGList::~QGList()
     // twice on the same address! This is insane but let's try not to crash
     // here.
     iterators = 0;
+#if defined(QT_THREAD_SUPPORT)
+    //delete mutex;
+#endif
 }
 
 
@@ -290,11 +303,13 @@ QGList& QGList::operator=( const QGList &list )
 
 bool QGList::operator==( const QGList &list ) const
 {
-    if ( count() != list.count() )
+    if ( count() != list.count() ) {
 	return FALSE;
+    }
 
-    if ( count() == 0 )
+    if ( count() == 0 ) {
 	return TRUE;
+    }
 
     QLNode *n1 = firstNode;
     QLNode *n2 = list.firstNode;
@@ -322,8 +337,15 @@ bool QGList::operator==( const QGList &list ) const
 
 QLNode *QGList::locate( uint index )
 {
-    if ( index == (uint)curIndex )		// current node ?
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
+    if ( index == (uint)curIndex ) {		// current node ?
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return curNode;
+    }
     if ( !curNode && firstNode ) {		// set current node
 	curNode	 = firstNode;
 	curIndex = 0;
@@ -332,13 +354,18 @@ QLNode *QGList::locate( uint index )
     int	 distance = index - curIndex;		// node distance to cur node
     bool forward;				// direction to traverse
 
-    if ( index >= numNodes )
+    if ( index >= numNodes ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return 0;
+    }
 
-    if ( distance < 0 )
+    if ( distance < 0 ) {
 	distance = -distance;
+    }
     if ( (uint)distance < index && (uint)distance < numNodes - index ) {
-	node =	curNode;			// start from current node
+	node = curNode;				// start from current node
 	forward = index > (uint)curIndex;
     } else if ( index < numNodes - index ) {	// start from first node
 	node = firstNode;
@@ -352,13 +379,18 @@ QLNode *QGList::locate( uint index )
 	forward = FALSE;
     }
     if ( forward ) {				// now run through nodes
-	while ( distance-- )
+	while ( distance-- ) {
 	    node = node->next;
+	}
     } else {
-	while ( distance-- )
+	while ( distance-- ) {
 	    node = node->prev;
+	}
     }
     curIndex = index;				// must update index
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return curNode = node;
 }
 
@@ -369,6 +401,9 @@ QLNode *QGList::locate( uint index )
 
 void QGList::inSort( QPtrCollection::Item d )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     int index = 0;
     register QLNode *n = firstNode;
     while ( n && compareItems(n->data,d) < 0 ){ // find position in list
@@ -376,6 +411,9 @@ void QGList::inSort( QPtrCollection::Item d )
 	index++;
     }
     insertAt( index, d );
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
 }
 
 
@@ -385,6 +423,9 @@ void QGList::inSort( QPtrCollection::Item d )
 
 void QGList::prepend( QPtrCollection::Item d )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     register QLNode *n = new QLNode( newItem(d) );
     Q_CHECK_PTR( n );
     n->prev = 0;
@@ -395,6 +436,9 @@ void QGList::prepend( QPtrCollection::Item d )
     firstNode = curNode = n;			// curNode affected
     numNodes++;
     curIndex = 0;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
 }
 
 
@@ -404,16 +448,24 @@ void QGList::prepend( QPtrCollection::Item d )
 
 void QGList::append( QPtrCollection::Item d )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     register QLNode *n = new QLNode( newItem(d) );
     Q_CHECK_PTR( n );
     n->next = 0;
-    if ( (n->prev = lastNode) )			// list is not empty
+    if ( (n->prev = lastNode) ) {		// list is not empty
 	lastNode->next = n;
-    else					// initialize list
+    }
+    else {					// initialize list
 	firstNode = n;
+    }
     lastNode = curNode = n;			// curNode affected
     curIndex = numNodes;
     numNodes++;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
 }
 
 
@@ -423,25 +475,43 @@ void QGList::append( QPtrCollection::Item d )
 
 bool QGList::insertAt( uint index, QPtrCollection::Item d )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     if ( index == 0 ) {
 	prepend( d );
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return TRUE;
-    } else if ( index == numNodes ) {
+    }
+    else if ( index == numNodes ) {
 	append( d );
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return TRUE;
     }
     QLNode *nextNode = locate( index );
-    if ( !nextNode )
+    if ( !nextNode ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return FALSE;
+    }
     QLNode *prevNode = nextNode->prev;
     register QLNode *n = new QLNode( newItem(d) );
     Q_CHECK_PTR( n );
     nextNode->prev = n;
+    Q_ASSERT( (!((curIndex > 0) && (!prevNode))) );
     prevNode->next = n;
     n->prev = prevNode;				// link new node into list
     n->next = nextNode;
     curNode = n;				// curIndex set by locate()
     numNodes++;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return TRUE;
 }
 
@@ -452,18 +522,30 @@ bool QGList::insertAt( uint index, QPtrCollection::Item d )
 
 void QGList::relinkNode( QLNode *n )
 {
-    if ( n == firstNode )			// already first
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
+    if ( n == firstNode ) {			// already first
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return;
+    }
     curNode = n;
     unlink();
     n->prev = 0;
-    if ( (n->next = firstNode) )		// list is not empty
+    if ( (n->next = firstNode) ) {		// list is not empty
 	firstNode->prev = n;
-    else					// initialize list
+    }
+    else {					// initialize list
 	lastNode = n;
+    }
     firstNode = curNode = n;			// curNode affected
     numNodes++;
     curIndex = 0;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
 }
 
 
@@ -473,8 +555,15 @@ void QGList::relinkNode( QLNode *n )
 
 QLNode *QGList::unlink()
 {
-    if ( curNode == 0 )				// null current node
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
+    if ( curNode == 0 ) {			// null current node
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return 0;
+    }
     register QLNode *n = curNode;		// unlink this node
     if ( n == firstNode ) {			// removing first node ?
 	if ( (firstNode = n->next) ) {
@@ -500,9 +589,13 @@ QLNode *QGList::unlink()
         curIndex--;
     }
 
-    if ( iterators )
+    if ( iterators ) {
 	iterators->notifyRemove( n, curNode );
+    }
     numNodes--;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return n;
 }
 
@@ -513,6 +606,9 @@ QLNode *QGList::unlink()
 
 bool QGList::removeNode( QLNode *n )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
 #if defined(QT_CHECK_NULL)
     if ( n == 0 || (n->prev && n->prev->next != n) ||
 	 (n->next && n->next->prev != n) ) {
@@ -526,6 +622,9 @@ bool QGList::removeNode( QLNode *n )
     delete n;
     curNode  = firstNode;
     curIndex = curNode ? 0 : -1;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return TRUE;
 }
 
@@ -537,13 +636,27 @@ bool QGList::removeNode( QLNode *n )
 
 bool QGList::remove( QPtrCollection::Item d )
 {
-    if ( d && find(d) == -1 )
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
+    if ( d && find(d) == -1 ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return FALSE;
+    }
     QLNode *n = unlink();
-    if ( !n )
+    if ( !n ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return FALSE;
+    }
     deleteItem( n->data );
     delete n;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return TRUE;
 }
 
@@ -553,13 +666,27 @@ bool QGList::remove( QPtrCollection::Item d )
 
 bool QGList::removeRef( QPtrCollection::Item d )
 {
-    if ( findRef(d) == -1 )
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
+    if ( findRef(d) == -1 ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return FALSE;
+    }
     QLNode *n = unlink();
-    if ( !n )
+    if ( !n ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return FALSE;
+    }
     deleteItem( n->data );
     delete n;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return TRUE;
 }
 
@@ -581,13 +708,27 @@ bool QGList::removeRef( QPtrCollection::Item d )
 
 bool QGList::removeAt( uint index )
 {
-    if ( !locate(index) )
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
+    if ( !locate(index) ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return FALSE;
+    }
     QLNode *n = unlink();
-    if ( !n )
+    if ( !n ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return FALSE;
+    }
     deleteItem( n->data );
     delete n;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return TRUE;
 }
 
@@ -597,13 +738,23 @@ bool QGList::removeAt( uint index )
 */
 bool QGList::replaceAt( uint index, QPtrCollection::Item d )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     QLNode *n = locate( index );
-    if ( !n )
+    if ( !n ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return FALSE;
+    }
     if ( n->data != d ) {
 	deleteItem( n->data );
 	n->data = newItem( d );
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return TRUE;
 }
 
@@ -615,10 +766,16 @@ bool QGList::replaceAt( uint index, QPtrCollection::Item d )
 
 QPtrCollection::Item QGList::takeNode( QLNode *n )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
 #if defined(QT_CHECK_NULL)
     if ( n == 0 || (n->prev && n->prev->next != n) ||
 	 (n->next && n->next->prev != n) ) {
 	qWarning( "QGList::takeNode: Corrupted node" );
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return 0;
     }
 #endif
@@ -628,6 +785,9 @@ QPtrCollection::Item QGList::takeNode( QLNode *n )
     delete n;					// delete the node, not data
     curNode  = firstNode;
     curIndex = curNode ? 0 : -1;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return d;
 }
 
@@ -637,9 +797,15 @@ QPtrCollection::Item QGList::takeNode( QLNode *n )
 
 QPtrCollection::Item QGList::take()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     QLNode *n = unlink();			// unlink node
     Item d = n ? n->data : 0;
     delete n;					// delete node, keep contents
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return d;
 }
 
@@ -649,11 +815,21 @@ QPtrCollection::Item QGList::take()
 
 QPtrCollection::Item QGList::takeAt( uint index )
 {
-    if ( !locate(index) )
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
+    if ( !locate(index) ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return 0;
+    }
     QLNode *n = unlink();			// unlink node
     Item d = n ? n->data : 0;
     delete n;					// delete node, keep contents
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return d;
 }
 
@@ -663,10 +839,16 @@ QPtrCollection::Item QGList::takeAt( uint index )
 
 QPtrCollection::Item QGList::takeFirst()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     first();
     QLNode *n = unlink();			// unlink node
     Item d = n ? n->data : 0;
     delete n;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return d;
 }
 
@@ -676,10 +858,16 @@ QPtrCollection::Item QGList::takeFirst()
 
 QPtrCollection::Item QGList::takeLast()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     last();
     QLNode *n = unlink();			// unlink node
     Item d = n ? n->data : 0;
     delete n;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return d;
 }
 
@@ -690,14 +878,18 @@ QPtrCollection::Item QGList::takeLast()
 
 void QGList::clear()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     register QLNode *n = firstNode;
 
     firstNode = lastNode = curNode = 0;		// initialize list
     numNodes = 0;
     curIndex = -1;
 
-    if ( iterators )
+    if ( iterators ) {
 	iterators->notifyClear( FALSE );
+    }
 
     QLNode *prevNode;
     while ( n ) {				// for all nodes ...
@@ -706,6 +898,9 @@ void QGList::clear()
 	n = n->next;
 	delete prevNode;			// deallocate node
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
 }
 
 
@@ -716,6 +911,9 @@ void QGList::clear()
 
 int QGList::findRef( QPtrCollection::Item d, bool fromStart )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     register QLNode *n;
     int	     index;
     if ( fromStart ) {				// start from first node
@@ -731,6 +929,9 @@ int QGList::findRef( QPtrCollection::Item d, bool fromStart )
     }
     curNode = n;
     curIndex = n ? index : -1;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return curIndex;				// return position of item
 }
 
@@ -742,6 +943,9 @@ int QGList::findRef( QPtrCollection::Item d, bool fromStart )
 
 int QGList::find( QPtrCollection::Item d, bool fromStart )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     register QLNode *n;
     int	     index;
     if ( fromStart ) {				// start from first node
@@ -757,6 +961,9 @@ int QGList::find( QPtrCollection::Item d, bool fromStart )
     }
     curNode = n;
     curIndex = n ? index : -1;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return curIndex;				// return position of item
 }
 
@@ -767,6 +974,9 @@ int QGList::find( QPtrCollection::Item d, bool fromStart )
 
 uint QGList::containsRef( QPtrCollection::Item d ) const
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     register QLNode *n = firstNode;
     uint     count = 0;
     while ( n ) {				// for all nodes...
@@ -774,6 +984,9 @@ uint QGList::containsRef( QPtrCollection::Item d ) const
 	    count++;
 	n = n->next;
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return count;
 }
 
@@ -784,6 +997,9 @@ uint QGList::containsRef( QPtrCollection::Item d ) const
 
 uint QGList::contains( QPtrCollection::Item d ) const
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     register QLNode *n = firstNode;
     uint     count = 0;
     QGList  *that = (QGList*)this;		// mutable for compareItems()
@@ -792,6 +1008,9 @@ uint QGList::contains( QPtrCollection::Item d ) const
 	    count++;
 	n = n->next;
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return count;
 }
 
@@ -839,10 +1058,19 @@ uint QGList::contains( QPtrCollection::Item d ) const
 
 QPtrCollection::Item QGList::first()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     if ( firstNode ) {
 	curIndex = 0;
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return (curNode=firstNode)->data;
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return 0;
 }
 
@@ -852,10 +1080,19 @@ QPtrCollection::Item QGList::first()
 
 QPtrCollection::Item QGList::last()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     if ( lastNode ) {
 	curIndex = numNodes-1;
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return (curNode=lastNode)->data;
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return 0;
 }
 
@@ -865,15 +1102,24 @@ QPtrCollection::Item QGList::last()
 
 QPtrCollection::Item QGList::next()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     if ( curNode ) {
 	if ( curNode->next ) {
 	    curIndex++;
 	    curNode = curNode->next;
+#if defined(QT_THREAD_SUPPORT)
+	    //mutex->unlock();
+#endif
 	    return curNode->data;
 	}
 	curIndex = -1;
 	curNode = 0;
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return 0;
 }
 
@@ -883,15 +1129,24 @@ QPtrCollection::Item QGList::next()
 
 QPtrCollection::Item QGList::prev()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     if ( curNode ) {
 	if ( curNode->prev ) {
 	    curIndex--;
 	    curNode = curNode->prev;
+#if defined(QT_THREAD_SUPPORT)
+	    //mutex->unlock();
+#endif
 	    return curNode->data;
 	}
 	curIndex = -1;
 	curNode = 0;
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return 0;
 }
 
@@ -902,9 +1157,16 @@ QPtrCollection::Item QGList::prev()
 
 void QGList::toVector( QGVector *vector ) const
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     vector->clear();
-    if ( !vector->resize( count() ) )
+    if ( !vector->resize( count() ) ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return;
+    }
     register QLNode *n = firstNode;
     uint i = 0;
     while ( n ) {
@@ -912,10 +1174,16 @@ void QGList::toVector( QGVector *vector ) const
 	n = n->next;
 	i++;
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
 }
 
 void QGList::heapSortPushDown( QPtrCollection::Item* heap, int first, int last )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     int r = first;
     while( r <= last/2 ) {
 	// Node r has only one child ?
@@ -950,6 +1218,9 @@ void QGList::heapSortPushDown( QPtrCollection::Item* heap, int first, int last )
 	    }
 	}
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
 }
 
 
@@ -962,9 +1233,16 @@ void QGList::heapSortPushDown( QPtrCollection::Item* heap, int first, int last )
 
 void QGList::sort()
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     uint n = count();
-    if ( n < 2 )
+    if ( n < 2 ) {
+#if defined(QT_THREAD_SUPPORT)
+	//mutex->unlock();
+#endif
 	return;
+    }
 
     // Create the heap
     QPtrCollection::Item* realheap = new QPtrCollection::Item[ n ];
@@ -995,6 +1273,9 @@ void QGList::sort()
     }
 
     delete [] realheap;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
 }
 
 
@@ -1019,6 +1300,9 @@ QDataStream &operator<<( QDataStream &s, const QGList &list )
 
 QDataStream &QGList::read( QDataStream &s )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     uint num;
     s >> num;					// read number of items
     clear();					// clear list
@@ -1042,6 +1326,9 @@ QDataStream &QGList::read( QDataStream &s )
     }
     curNode  = firstNode;
     curIndex = curNode ? 0 : -1;
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return s;
 }
 
@@ -1051,12 +1338,18 @@ QDataStream &QGList::read( QDataStream &s )
 
 QDataStream &QGList::write( QDataStream &s ) const
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     s << count();				// write number of items
     QLNode *n = firstNode;
     while ( n ) {				// write all items
 	write( s, n->data );
 	n = n->next;
     }
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return s;
 }
 
@@ -1068,9 +1361,15 @@ QDataStream &QGList::write( QDataStream &s ) const
  */
 QLNode* QGList::erase( QLNode* it )
 {
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->lock();
+#endif
     QLNode* n = it;
     it = it->next;
     removeNode( n );
+#if defined(QT_THREAD_SUPPORT)
+    //mutex->unlock();
+#endif
     return it;
 }
 
diff --git a/src/tools/qglist.h b/src/tools/qglist.h
index fadc46c..dfacf47 100644
--- a/src/tools/qglist.h
+++ b/src/tools/qglist.h
@@ -59,6 +59,8 @@ private:
     QLNode( QPtrCollection::Item d ) { data = d; }
 };
 
+class QMutex;
+class QGListPrivate;
 class QGListIteratorList; // internal helper class
 
 class Q_EXPORT QGList : public QPtrCollection	// doubly linked generic list
@@ -147,6 +149,12 @@ private:
 
     QLNode *locate( uint );			// get node at i'th pos
     QLNode *unlink();				// unlink node
+
+#if defined(QT_THREAD_SUPPORT)
+//     QMutex* mutex;
+#endif
+
+//     QGListPrivate* d;
 };