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comparison test/runtime/7196045/Test7196045.java @ 6779:6af8f3562069

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7196045: Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API. Reviewed-by: sspitsyn, dholmes
author kevinw
date Wed, 19 Sep 2012 15:24:32 +0100
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children fab6fbf427d2
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6771:45f22ba9348d 6779:6af8f3562069
1 /*
2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 /*
26 * @test
27 * @bug 7196045
28 * @summary Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.
29 * @run main/othervm
30 */
31
32 import java.lang.management.ManagementFactory;
33 import javax.management.JMException;
34 import javax.management.MBeanServer;
35 import javax.management.MalformedObjectNameException;
36 import javax.management.ObjectName;
37
38 public class Test7196045 {
39
40 public static long duration = 1000 * 60 * 2;
41 private static final String HOTSPOT_INTERNAL = "sun.management:type=HotspotInternal";
42
43 public static void main(String[] args) {
44
45 MBeanServer server = ManagementFactory.getPlatformMBeanServer();
46 ObjectName objName= null;
47 try {
48 ObjectName hotspotInternal = new ObjectName(HOTSPOT_INTERNAL);
49 try {
50 server.registerMBean(new sun.management.HotspotInternal(), hotspotInternal);
51 } catch (JMException e) {
52 throw new RuntimeException("HotSpotWatcher: Failed to register the HotspotInternal MBean" + e);
53 }
54 objName= new ObjectName("sun.management:type=HotspotThreading");
55
56 } catch (MalformedObjectNameException e1) {
57 throw new RuntimeException("Bad object name" + e1);
58 }
59
60 long endTime = System.currentTimeMillis() + duration;
61 long i = 0;
62 while (true) {
63 try {
64 server.getAttribute(objName, "InternalThreadCpuTimes");
65 } catch (Exception ex) {
66 System.err.println("Exception while getting attribute: " + ex);
67 }
68 i++;
69 if (i % 10000 == 0) {
70 System.out.println("Successful iterations: " + i);
71 }
72 if (System.currentTimeMillis() > endTime) {
73 break;
74 }
75 }
76 System.out.println("PASSED.");
77 }
78 }