src/macosx/classes/sun/lwawt/macosx/CToolkitThreadBlockedHandler.java

*** 39,50 ****
      protected boolean isOwned() {
         return false;
      }
  
      public void enter() {
          toolkit.startNativeNestedEventLoop();
      }
  
      public void exit() {
-         toolkit.stopNativeNestedEventLoop();
      }
  }
--- 39,52 ----
      protected boolean isOwned() {
         return false;
      }
  
      public void enter() {
+         // Despite the naming of this method, on MacOS only one
+         // event is read and dispatched before this method returns.
+         // This call is non-blocking and does not wait for an event
          toolkit.startNativeNestedEventLoop();
      }
  
      public void exit() {
      }
  }