Fix X11 fd polling initialization in glib main loop

This resolves Bug 1358

src/kernel/qeventloop_glib_p.h

@@ -86,6 +86,10 @@ class QEventLoopPrivate
 public:
 	QEventLoopPrivate()
 	{
+#if defined(Q_WS_X11)
+		xfd = -1;
+		x_gPollFD.fd = -1;
+#endif // Q_WS_X11
 		reset();
 	}
 
@@ -106,9 +110,7 @@ public:
 
 #if defined(Q_WS_X11)
 	int xfd;
-	
-	GPollFD x_gPollFD; 
-	
+	GPollFD x_gPollFD;
 #endif // Q_WS_X11
 
 	int thread_pipe[2];
@@ -119,7 +121,7 @@ public:
 	QPtrList<QSockNotGPollFD> sn_pending_list;
 
 	// store flags for one iteration
-	uint pev_flags;  	
+	uint pev_flags;
 
 	// My GSource
 	GSource * gSource;

src/kernel/qeventloop_x11_glib.cpp

@@ -82,15 +82,32 @@ static GSourceFuncs qt_gsource_funcs = {
 static gboolean qt_gsource_prepare  ( GSource *source,
 	gint *timeout )
 {
-	QtGSource * qtGSource;
-	qtGSource = (QtGSource*) source;
-	return qtGSource->qeventLoop->gsourcePrepare(source, timeout);
+	QtGSource * qtGSource = (QtGSource*) source;
+	QEventLoop* candidateEventLoop = qtGSource->qeventLoop;
+	QEventLoop* activeThreadEventLoop = QApplication::eventLoop();
+
+	if (candidateEventLoop == activeThreadEventLoop) {
+		return candidateEventLoop->gsourcePrepare(source, timeout);
+	}
+	else {
+		// Prepare failed
+		return FALSE;
+	}
 }
 
 static gboolean qt_gsource_check    ( GSource *source ) 
 {
 	QtGSource * qtGSource = (QtGSource*) source;
-	return qtGSource->qeventLoop->gsourceCheck(source);
+	QEventLoop* candidateEventLoop = qtGSource->qeventLoop;
+	QEventLoop* activeThreadEventLoop = QApplication::eventLoop();
+
+	if (candidateEventLoop == activeThreadEventLoop) {
+		return candidateEventLoop->gsourceCheck(source);
+	}
+	else {
+		// Check failed
+		return FALSE;
+	}
 }
 
 static gboolean qt_gsource_dispatch ( GSource *source,
@@ -205,25 +222,24 @@ void QEventLoop::init()
 	qtGSource->qeventLoop = this;
 
 	// init main loop and attach gsource
-
 #ifdef DEBUG_QT_GLIBMAINLOOP
 	printf("inside init(1)\n");
 #endif
 
 	g_main_loop_new (d->ctx, 1);
 	g_source_attach( (GSource*)qtGSource, d->ctx );
-	d->gSource = (GSource*) qtGSource;
+	d->gSource = (GSource*)qtGSource;
 
 	// poll for X11 events
 	if ( qt_is_gui_used && QApplication::isGuiThread() ) {
 		d->x_gPollFD.fd = d->xfd;
-		d->x_gPollFD.events = G_IO_IN | G_IO_HUP;
+		d->x_gPollFD.events = G_IO_IN | G_IO_HUP | G_IO_ERR;
 		g_source_add_poll(d->gSource, &d->x_gPollFD);
 	}
 
 	// poll thread-pipe
 	d->threadPipe_gPollFD.fd = d->thread_pipe[0];
-	d->threadPipe_gPollFD.events = G_IO_IN | G_IO_HUP;
+	d->threadPipe_gPollFD.events = G_IO_IN | G_IO_HUP | G_IO_ERR;
 	
 	g_source_add_poll(d->gSource, &d->threadPipe_gPollFD); 
 	
@@ -279,7 +295,7 @@ bool QEventLoop::processX11Events()
 	ProcessEventsFlags flags = d->pev_flags;
 	// process events from the X server
 	XEvent event;
-	int	   nevents = 0;
+	int nevents = 0;
 
 #if defined(QT_THREAD_SUPPORT)
 	QMutexLocker locker( QApplication::qt_mutex );
@@ -295,49 +311,50 @@ bool QEventLoop::processX11Events()
 				// also flushes output buffer
 				while ( XPending( QPaintDevice::x11AppDisplay() ) ) {
 					if ( d->shortcut ) {
-					return FALSE;
+						return FALSE;
 					}
 			
 					XNextEvent( QPaintDevice::x11AppDisplay(), &event );
 			
 					if ( flags & ExcludeUserInput ) {
 						switch ( event.type ) {
-						case ButtonPress:
-						case ButtonRelease:
-						case MotionNotify:
-						case XKeyPress:
-						case XKeyRelease:
-						case EnterNotify:
-						case LeaveNotify:
-							continue;
-				
-						case ClientMessage:
-							{
-							// from qapplication_x11.cpp
-							extern Atom qt_wm_protocols;
-							extern Atom qt_wm_take_focus;
-							extern Atom qt_qt_scrolldone;
-				
-							// only keep the wm_take_focus and
-							// qt_qt_scrolldone protocols, discard all
-							// other client messages
-							if ( event.xclient.format != 32 )
+							case ButtonPress:
+							case ButtonRelease:
+							case MotionNotify:
+							case XKeyPress:
+							case XKeyRelease:
+							case EnterNotify:
+							case LeaveNotify:
 								continue;
-				
-							if ( event.xclient.message_type == qt_wm_protocols ||
-								(Atom) event.xclient.data.l[0] == qt_wm_take_focus )
-								break;
-							if ( event.xclient.message_type == qt_qt_scrolldone )
-								break;
-							}
-				
-						default: break;
+					
+							case ClientMessage:
+								{
+								// from qapplication_x11.cpp
+								extern Atom qt_wm_protocols;
+								extern Atom qt_wm_take_focus;
+								extern Atom qt_qt_scrolldone;
+					
+								// only keep the wm_take_focus and
+								// qt_qt_scrolldone protocols, discard all
+								// other client messages
+								if ( event.xclient.format != 32 )
+									continue;
+					
+								if ( event.xclient.message_type == qt_wm_protocols ||
+									(Atom) event.xclient.data.l[0] == qt_wm_take_focus )
+									break;
+								if ( event.xclient.message_type == qt_qt_scrolldone )
+									break;
+								}
+					
+							default: break;
 						}
 					}
 			
 					nevents++;
-					if ( qApp->x11ProcessEvent( &event ) == 1 )
-					return TRUE;
+					if ( qApp->x11ProcessEvent( &event ) == 1 ) {
+						return TRUE;
+					}
 				}
 			}
 		}
@@ -463,14 +480,9 @@ bool QEventLoop::gsourceCheck(GSource *gs) {
 	printf("inside gsourceCheck(1)\n");
 #endif
 
-
 	// Socketnotifier events?
-
 	QPtrList<QSockNotGPollFD> *list = &d->sn_list;
-
 	//if ( list ) {
-
-
 		QSockNotGPollFD *sn = list->first();
 		while ( sn ) {
 			if ( sn->gPollFD.revents )
@@ -500,10 +512,9 @@ bool QEventLoop::gsourceCheck(GSource *gs) {
 
 		return TRUE; // we got more X11 events!
 	}
-	// check if we have timers to activate?
 
+	// check if we have timers to activate?
 	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");
@@ -513,7 +524,6 @@ bool QEventLoop::gsourceCheck(GSource *gs) {
 	}
 
 	// nothing to dispatch
-
 #ifdef DEBUG_QT_GLIBMAINLOOP
 	printf("inside gsourceCheck(2) nothing to dispatch!\n");
 #endif
@@ -534,7 +544,6 @@ bool QEventLoop::gsourceDispatch(GSource *gs) {
 #endif
 
 	int nevents=0;
-
 	ProcessEventsFlags flags = d->pev_flags;
 
 #ifdef DEBUG_QT_GLIBMAINLOOP
@@ -588,12 +597,10 @@ bool QEventLoop::gsourceDispatch(GSource *gs) {
 	//return (nevents > 0);
 
 	// now process x11 events!
-
 #ifdef DEBUG_QT_GLIBMAINLOOP
 	printf("inside gsourceDispatch(2) hasPendingEvents=%d\n", hasPendingEvents());
 #endif
 
-
 	if (hasPendingEvents()) {
 		// color approx. optimization - only on X11
 		qt_reset_color_avail();
@@ -627,6 +634,11 @@ void QEventLoop::appStartingUp()
 {
 	if ( qt_is_gui_used ) {
 		d->xfd = XConnectionNumber( QPaintDevice::x11AppDisplay() );
+		if ( (d->x_gPollFD.fd == -1) && QApplication::isGuiThread() ) {
+			d->x_gPollFD.fd = d->xfd;
+			d->x_gPollFD.events = G_IO_IN | G_IO_HUP | G_IO_ERR;
+			g_source_add_poll(d->gSource, &d->x_gPollFD);
+		}
 	}
 }