--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/management/ThreadMXBean/FindDeadlocks.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,126 @@
+/*
+ * 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     5086470
+ * @summary Basic Test for the following methods:
+ *          - ThreadMXBean.findDeadlockedThreads()
+ *          - ThreadMXBean.findMonitorDeadlockedThreads()
+ * @author  Mandy Chung
+ *
+ * @build MonitorDeadlock
+ * @build SynchronizerDeadlock
+ * @build ThreadDump
+ * @run main FindDeadlocks
+ */
+
+import java.lang.management.*;
+import java.util.*;
+
+public class FindDeadlocks {
+    static ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
+    public static void main(String[] argv) {
+        ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
+        // create deadlocked threads
+        MonitorDeadlock md = new MonitorDeadlock();
+
+        // no deadlock
+        if (findDeadlocks() != null) {
+            throw new RuntimeException("TEST FAILED: Should return null.");
+        }
+
+        // Let the threads to proceed
+        md.goDeadlock();
+        // wait until the deadlock is ready
+        md.waitUntilDeadlock();
+
+        long[] mthreads = findDeadlocks();
+        if (mthreads == null) {
+            ThreadDump.dumpStacks();
+            throw new RuntimeException("TEST FAILED: Deadlock not detected.");
+        }
+        md.checkResult(mthreads);
+
+        // create deadlocked threads on synchronizers
+        SynchronizerDeadlock sd = new SynchronizerDeadlock();
+
+        // Let the threads to proceed
+        sd.goDeadlock();
+        // wait until the deadlock is ready
+        sd.waitUntilDeadlock();
+
+        // Find Deadlock
+        long[] threads = findDeadlocks();
+        if (threads == null) {
+            ThreadDump.dumpStacks();
+            throw new RuntimeException("TEST FAILED: Deadlock not detected.");
+        }
+
+        // form a list of newly deadlocked threads
+        long[] newList = new long[threads.length - mthreads.length];
+        int count = 0;
+        for (int i = 0; i < threads.length; i++) {
+            long id = threads[i];
+            boolean isNew = true;
+            for (int j = 0; j < mthreads.length; j++) {
+                if (mthreads[j] == id) {
+                    isNew = false;
+                    break;
+                }
+            }
+            if (isNew) {
+                newList[count++] = id;
+            }
+        }
+
+        if (mbean.isSynchronizerUsageSupported()) {
+            sd.checkResult(newList);
+        } else {
+            // monitoring of synchronizer usage not supported
+            if (count != 0) {
+                throw new RuntimeException("TEST FAILED: NewList should be empty.");
+            }
+        }
+
+        // Print Deadlock stack trace
+        System.out.println("Found threads that are in deadlock:-");
+        ThreadInfo[] infos = mbean.getThreadInfo(threads, Integer.MAX_VALUE);
+        for (int i = 0; i < infos.length; i++) {
+            ThreadDump.printThreadInfo(infos[i]);
+        }
+
+        System.out.println("Test passed");
+    }
+    static long[] findDeadlocks() {
+        long[] threads;
+        if (mbean.isSynchronizerUsageSupported()) {
+            threads = mbean.findDeadlockedThreads();
+        } else {
+            threads = mbean.findMonitorDeadlockedThreads();
+        }
+        return threads;
+    }
+
+}