Merge branch 'uli42-pr/fix-crash-in-XPeekEvent' into 3.6.x

nx-X11/lib/X11/IfEvent.c

@@ -73,6 +73,7 @@ XIfEvent (dpy, event, predicate, arg)
 		prev = NULL;
 #ifdef NX_TRANS_SOCKET
             if (_XGetIOError(dpy)) {
+                UnlockDisplay(dpy);
                 return 0;
             }
 #endif

nx-X11/lib/X11/MaskEvent.c

@@ -77,6 +77,7 @@ XMaskEvent (dpy, mask, event)
 		prev = NULL;
 #ifdef NX_TRANS_SOCKET
             if (_XGetIOError(dpy)) {
+                UnlockDisplay(dpy);
                 return 0;
             }
 #endif

nx-X11/lib/X11/NextEvent.c

@@ -48,6 +48,12 @@ XNextEvent (dpy, event)
 	
 	if (dpy->head == NULL)
 	    _XReadEvents(dpy);
+#ifdef NX_TRANS_SOCKET
+	if (_XGetIOError(dpy)) {
+	    UnlockDisplay(dpy);
+	    return 0;
+	}
+#endif
 	qelt = dpy->head;
 	*event = qelt->event;
 	_XDeq(dpy, NULL, qelt);

nx-X11/lib/X11/PeekEvent.c

@@ -46,6 +46,12 @@ XPeekEvent (dpy, event)
 	LockDisplay(dpy);
 	if (dpy->head == NULL)
 	    _XReadEvents(dpy);
+#ifdef NX_TRANS_SOCKET
+	if (_XGetIOError(dpy)) {
+	    UnlockDisplay(dpy);
+	    return 1;
+	}
+#endif
 	*event = (dpy->head)->event;
 	UnlockDisplay(dpy);
 	return 1;

nx-X11/lib/X11/PeekIfEv.c

@@ -73,6 +73,7 @@ XPeekIfEvent (dpy, event, predicate, arg)
 		prev = NULL;
 #ifdef NX_TRANS_SOCKET
             if (_XGetIOError(dpy)) {
+                UnlockDisplay(dpy);
                 return 0;
             }
 #endif

nx-X11/lib/X11/WinEvent.c

@@ -79,5 +79,11 @@ XWindowEvent (dpy, w, mask, event)
 	    if (prev && prev->qserial_num != qe_serial)
 		/* another thread has snatched this event */
 		prev = NULL;
+#ifdef NX_TRANS_SOCKET
+	    if (_XGetIOError(dpy)) {
+	      UnlockDisplay(dpy);
+	      return 0;
+	    }
+#endif
 	}
 }