1 /*
2 * Copyright (c) 2013, 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 import java.lang.management.ManagementFactory;
25 import java.lang.management.ThreadMXBean;
26 import java.util.Random;
27
28 /*
29 * @test
30 * @bug 8016304
31 * @summary Make sure no deadlock is reported for this program which has no deadlocks.
32 * @run main/othervm TestFalseDeadLock
33 */
34
35 /*
36 * This test will not provoke the bug every time it is run since the bug is intermittent.
37 * The test has a fixed running time of 5 seconds.
38 */
39
40 public class TestFalseDeadLock {
41 private static ThreadMXBean bean;
42 private static volatile boolean running = true;
43 private static volatile boolean found = false;
44
45 public static void main(String[] args) throws Exception {
46 bean = ManagementFactory.getThreadMXBean();
47 Thread[] threads = new Thread[500];
48 for (int i = 0; i < threads.length; i++) {
49 Test t = new Test();
50 threads[i] = new Thread(t);
51 threads[i].start();
52 }
53 try {
54 Thread.sleep(5000);
55 } catch (InterruptedException ex) {
56 }
57 running = false;
58 for (Thread t : threads) {
59 t.join();
60 }
61 if (found) {
62 throw new Exception("Deadlock reported, but there is no deadlock.");
63 }
64 }
65
66 public static class Test implements Runnable {
67 public void run() {
68 Random r = new Random();
69 while (running) {
70 try {
71 synchronized (this) {
72 wait(r.nextInt(1000) + 1);
73 }
74 } catch (InterruptedException ex) {
75 }
76 recurse(2000);
77 }
78 if (bean.findDeadlockedThreads() != null) {
79 System.out.println("FOUND!");
80 found = true;
81 }
82 }
83
84 private void recurse(int i) {
85 if (!running) {
86 // It is important for the test to call println here
87 // since there are locks inside that path.
88 System.out.println("Hullo");
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1 /*
2 * Copyright (c) 2013, 2014, 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 import com.oracle.java.testlibrary.Utils;
25 import java.lang.management.ManagementFactory;
26 import java.lang.management.ThreadMXBean;
27 import java.util.Random;
28
29 /*
30 * @test
31 * @bug 8016304
32 * @summary Make sure no deadlock is reported for this program which has no deadlocks.
33 * @library /testlibrary
34 * @run main/othervm TestFalseDeadLock
35 */
36
37 /*
38 * This test will not provoke the bug every time it is run since the bug is intermittent.
39 * The test has a fixed running time of 5 seconds.
40 */
41
42 public class TestFalseDeadLock {
43 private static ThreadMXBean bean;
44 private static volatile boolean running = true;
45 private static volatile boolean found = false;
46
47 public static void main(String[] args) throws Exception {
48 bean = ManagementFactory.getThreadMXBean();
49 Thread[] threads = new Thread[500];
50 for (int i = 0; i < threads.length; i++) {
51 Test t = new Test();
52 threads[i] = new Thread(t);
53 threads[i].start();
54 }
55 try {
56 Thread.sleep(5000);
57 } catch (InterruptedException ex) {
58 }
59 running = false;
60 for (Thread t : threads) {
61 t.join();
62 }
63 if (found) {
64 throw new Exception("Deadlock reported, but there is no deadlock.");
65 }
66 }
67
68 public static class Test implements Runnable {
69 public void run() {
70 Random r = Utils.getRandomInstance();
71 while (running) {
72 try {
73 synchronized (this) {
74 wait(r.nextInt(1000) + 1);
75 }
76 } catch (InterruptedException ex) {
77 }
78 recurse(2000);
79 }
80 if (bean.findDeadlockedThreads() != null) {
81 System.out.println("FOUND!");
82 found = true;
83 }
84 }
85
86 private void recurse(int i) {
87 if (!running) {
88 // It is important for the test to call println here
89 // since there are locks inside that path.
90 System.out.println("Hullo");
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