src/java.desktop/share/classes/sun/awt/dnd/SunDragSourceContextPeer.java

rev 58521 : 7185258: [macosx] Deadlock in SunToolKit.realSync()
Reviewed-by: XXX

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -72,11 +72,11 @@
     private Point             dragImageOffset;
     private long              nativeCtxt;
     private DragSourceContext dragSourceContext;
     private int               sourceActions;
 
-    private static boolean    dragDropInProgress = false;
+    private static volatile boolean dragDropInProgress = false;
     private static boolean    discardingMouseEvents = false;
 
     /*
      * dispatch constants
      */

@@ -379,10 +379,14 @@
         if (dragDropInProgress) {
             throw new InvalidDnDOperationException(getExceptionMessage(true));
         }
     }
 
+    public static boolean isDragDropInProgress() {
+        return dragDropInProgress;
+    }
+
     private static String getExceptionMessage(boolean b) {
         return b ? "Drag and drop in progress" : "No drag in progress";
     }
 
     public static int convertModifiersToDropAction(final int modifiers,