private void XEventThread ()
{
	while (true) {
		XEvent xevent = new XEvent ();

		Xlib.XNextEvent (display, ref xevent);

		if (xevent.AnyEvent.type == XEventName.KeyPress
		    && Xlib.XFilterEvent (ref xevent, FosterParent.Handle))
			continue;

		X11Hwnd hwnd = (X11Hwnd)Hwnd.GetObjectFromWindow(xevent.AnyEvent.window);
		if (hwnd != null)
			hwnd.Queue.EnqueueLocked (xevent);
	}
}