8031694: [macosx] TwentyThousandTest test intermittently hangs

Reviewed-by: art, anthony

src/share/classes/java/awt/EventQueue.java

 /*
- * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2014, 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
@@ -1093,6 +1093,13 @@ public class EventQueue {
                 dispatchThread = null;
             }
             AWTAutoShutdown.getInstance().notifyThreadFree(edt);
+            /*
+             * Event was posted after EDT events pumping had stopped, so start
+             * another EDT to handle this event
+             */
+            if (peekEvent() != null) {
+                initDispatchThread();
+            }
         } finally {
             pushPopLock.unlock();
         }

test/java/awt/EventDispatchThread/EDTShutdownTest/EDTShutdownTest.java

+/*
+ * Copyright (c) 2014, 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+  @test
+  @bug 8031694
+  @summary [macosx] TwentyThousandTest test intermittently hangs
+  @author Oleg Pekhovskiy
+  @run main EDTShutdownTest
+ */
+
+import java.awt.EventQueue;
+import java.awt.Toolkit;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import sun.awt.AWTAccessor;
+
+public class EDTShutdownTest {
+
+    private static boolean passed = false;
+
+    public static void main(String[] args) {
+        // Force EDT start with InvocationEvent
+        EventQueue.invokeLater(() -> {
+            // EventQueue is empty now
+            EventQueue queue = Toolkit.getDefaultToolkit()
+                               .getSystemEventQueue();
+            Thread thread = AWTAccessor.getEventQueueAccessor()
+                            .getDispatchThread(queue);
+            try {
+                /*
+                 * Clear EventDispatchThread.doDispatch flag to break message
+                 * loop in EventDispatchThread.pumpEventsForFilter()
+                 */
+                Method stopDispatching = thread.getClass()
+                        .getDeclaredMethod("stopDispatching", null);
+                stopDispatching.setAccessible(true);
+                stopDispatching.invoke(thread, null);
+
+                /*
+                 * Post another InvocationEvent that must be handled by another
+                 * instance of EDT
+                 */
+                EventQueue.invokeLater(() -> {
+                    passed = true;
+                });
+            }
+            catch (InvocationTargetException | NoSuchMethodException
+                   | IllegalAccessException e) {
+            }
+        });
+
+        // Wait for EDT shutdown
+        EventQueue queue = Toolkit.getDefaultToolkit().getSystemEventQueue();
+        Thread thread = AWTAccessor.getEventQueueAccessor()
+                        .getDispatchThread(queue);
+        try {
+            thread.join();
+
+            /*
+             * Wait for another EDT instance to handle the InvocationEvent
+             * and shutdown
+             */
+            thread = AWTAccessor.getEventQueueAccessor()
+                     .getDispatchThread(queue);
+            if (thread != null) {
+                thread.join();
+            }
+        }
+        catch (InterruptedException e) {
+        }
+
+        if (passed) {
+            System.out.println("Test PASSED!");
+        }
+        else {
+            throw new RuntimeException("Test FAILED!");
+        }
+    }
+}