Fix threading deadlock between Xine and our X11 event processor

This relates to Bug 1905

xine_artsplugin/xinePlayObject_impl.cpp

@@ -683,47 +683,54 @@ void xinePlayObject_impl::resizeNotify()
     XFlush( display );
 }
 
+// FIXME
+// Due to somewhat recent changes in XLib threading this had to be changed to a polling routine
+// Specifically XNextEvent acquires a global XLib lock, preventing any other XLib methods (including those used in the Xine library) from executing
+// Seems this is a known problem in other projects as well, with the only real option being a rewrite to use xcb natively (not sure if that is even possible here):
+// http://mail-archives.apache.org/mod_mbox/harmony-dev/200905.mbox/%3C200905181317.n4IDHtGQ002008@d06av03.portsmouth.uk.ibm.com%3E
 void xinePlayObject_impl::eventLoop()
 {
-    XEvent event;
-
-    do
-    {
-	XNextEvent( display, &event );
-
-	if (event.type == Expose && event.xexpose.count == 0 &&
-	    event.xexpose.window == visual.d)
-	{
-	    pthread_mutex_lock( &mutex );
-
-	    if (stream != 0)
-	    {
-		xine_port_send_gui_data( vo_port,
-				       XINE_GUI_SEND_EXPOSE_EVENT,
-				       &event );
-	    }
-	    else
-	    {
-		clearWindow();
-	    }
-	    pthread_mutex_unlock( &mutex );
+	XEvent event;
+	bool eventReceived = false;
+	
+	do {
+		if (XPending( display )) {
+			XNextEvent( display, &event );
+			eventReceived = true;
+
+			if (event.type == Expose && event.xexpose.count == 0 && event.xexpose.window == visual.d) {
+				pthread_mutex_lock( &mutex );
+			
+				if (stream != 0) {
+					xine_port_send_gui_data( vo_port,
+							XINE_GUI_SEND_EXPOSE_EVENT,
+							&event );
+				}
+				else {
+					clearWindow();
+				}
+				pthread_mutex_unlock( &mutex );
+			}
+			else if (event.type == shmCompletionType) {
+				pthread_mutex_lock( &mutex );
+			
+				if (stream != 0) {
+					xine_port_send_gui_data( vo_port,
+							XINE_GUI_SEND_COMPLETION_EVENT,
+							&event );
+				}
+				pthread_mutex_unlock( &mutex );
+			}
+		}
+		else {
+			usleep(10000);
+			eventReceived = false;
+		}
 	}
-	else if (event.type == shmCompletionType)
-	{
-	    pthread_mutex_lock( &mutex );
-
-	    if (stream != 0)
-	    {
-		xine_port_send_gui_data( vo_port,
-				       XINE_GUI_SEND_COMPLETION_EVENT,
-				       &event );
-	    }
-	    pthread_mutex_unlock( &mutex );
-	}
-    }
-    while (event.type != ClientMessage ||
-	   event.xclient.message_type != xcomAtomQuit ||
-	   event.xclient.window != xcomWindow);
+	while (!eventReceived ||
+		event.type != ClientMessage ||
+		event.xclient.message_type != xcomAtomQuit ||
+		event.xclient.window != xcomWindow);
 }
 
 void xineVideoPlayObject_impl::x11WindowId( long window )