AnnotationTypeDeadlockTest.java revision 7942:2281a7f79738 
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/*
25 * @test
26 * @bug 7122142
27 * @summary Test deadlock situation when recursive annotations are parsed
28 */
29
30import java.lang.annotation.Retention;
31import java.lang.management.ManagementFactory;
32import java.lang.management.ThreadInfo;
33import java.lang.management.ThreadMXBean;
34import java.util.concurrent.CountDownLatch;
35import java.util.concurrent.atomic.AtomicInteger;
36
37import static java.lang.annotation.RetentionPolicy.RUNTIME;
38
39public class AnnotationTypeDeadlockTest {
40
41    @Retention(RUNTIME)
42    @AnnB
43    public @interface AnnA {
44    }
45
46    @Retention(RUNTIME)
47    @AnnA
48    public @interface AnnB {
49    }
50
51    static class Task extends Thread {
52        final CountDownLatch prepareLatch;
53        final AtomicInteger goLatch;
54        final Class<?> clazz;
55
56        Task(CountDownLatch prepareLatch, AtomicInteger goLatch, Class<?> clazz) {
57            super(clazz.getSimpleName());
58            setDaemon(true); // in case it deadlocks
59            this.prepareLatch = prepareLatch;
60            this.goLatch = goLatch;
61            this.clazz = clazz;
62        }
63
64        @Override
65        public void run() {
66            prepareLatch.countDown();  // notify we are prepared
67            while (goLatch.get() > 0); // spin-wait before go
68            clazz.getDeclaredAnnotations();
69        }
70    }
71
72    public static void main(String[] args) throws Exception {
73        CountDownLatch prepareLatch = new CountDownLatch(2);
74        AtomicInteger goLatch = new AtomicInteger(1);
75        Task taskA = new Task(prepareLatch, goLatch, AnnA.class);
76        Task taskB = new Task(prepareLatch, goLatch, AnnB.class);
77        taskA.start();
78        taskB.start();
79        // wait until both threads start-up
80        prepareLatch.await();
81        // let them go
82        goLatch.set(0);
83        // obtain ThreadMXBean
84        ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
85        // wait for threads to finish or dead-lock
86        while (taskA.isAlive() || taskB.isAlive()) {
87            // attempt to join threads
88            taskA.join(500L);
89            taskB.join(500L);
90            // detect dead-lock
91            long[] deadlockedIds = threadBean.findMonitorDeadlockedThreads();
92            if (deadlockedIds != null && deadlockedIds.length > 0) {
93                StringBuilder sb = new StringBuilder("deadlock detected:\n\n");
94                for (ThreadInfo ti : threadBean.getThreadInfo(deadlockedIds, Integer.MAX_VALUE)) {
95                    sb.append(ti);
96                }
97                throw new IllegalStateException(sb.toString());
98            }
99        }
100    }
101}
102