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

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@@ -39,12 +39,14 @@
     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() {
-        toolkit.stopNativeNestedEventLoop();
     }
 }