--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/management/ThreadMXBean/SharedSynchronizer.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug     6337571
+ * @summary Test if findDeadlockedThreads works for an ownable synchronizer
+ *          in shared mode which has no owner when a thread is parked.
+ * @author  Mandy Chung
+ *
+ * @run main SharedSynchronizer
+ */
+
+
+import java.util.concurrent.*;
+import java.lang.management.ManagementFactory;
+import java.lang.management.ThreadMXBean;
+
+public class SharedSynchronizer {
+    public static void main(String[] args) throws Exception {
+        MyThread t = new MyThread();
+        t.setDaemon(true);
+        t.start();
+
+        ThreadMXBean tmbean = ManagementFactory.getThreadMXBean();
+        if (!tmbean.isSynchronizerUsageSupported()) {
+            System.out.println("Monitoring of synchronizer usage not supported")
+;
+            return;
+        }
+
+        long[] result = tmbean.findDeadlockedThreads();
+        if (result != null) {
+             throw new RuntimeException("TEST FAILED: result should be null");
+        }
+    }
+
+    static class MyThread extends Thread {
+        public void run() {
+            FutureTask f = new FutureTask(
+                new Callable() {
+                    public Object call() {
+                        throw new RuntimeException("should never reach here");
+                    }
+                }
+            );
+
+            // A FutureTask uses the AbstractOwnableSynchronizer in a shared
+            // mode (not exclusive mode). When the thread calls f.get(),
+            // it will put to park on the ownable synchronizer that
+            // is not owned by any thread.
+            try {
+                f.get();
+            } catch (Exception e) {
+                RuntimeException re = new RuntimeException(e.getMessage());
+                re.initCause(e);
+                throw re;
+            }
+        }
+    }
+}