1 /*
2 * Copyright (c) 2015, 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.*;
25 import java.util.*;
26 import java.util.concurrent.*;
27 import java.util.concurrent.atomic.*;
28
29 /*
30 * @test
31 * @bug 6588467
32 * @summary Basic test of ThreadInfo.isDaemon
33 * @author Jeremy Manson
34 * @modules java.management
35 */
36 public class ThreadDaemonTest {
37
38 public static void main(String[] args) throws Exception {
39 final int NUM_THREADS = 20;
40 final String THREAD_PREFIX = "ThreadDaemonTest-";
41
42 final CountDownLatch started = new CountDownLatch(NUM_THREADS);
43 final CountDownLatch finished = new CountDownLatch(1);
44 final AtomicReference<Exception> fail = new AtomicReference<>(null);
45
46 Thread[] allThreads = new Thread[NUM_THREADS];
47 ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
48 Random rand = new Random();
49
50 for (int i = 0; i < NUM_THREADS; i++) {
51 allThreads[i] = new Thread(new Runnable() {
52 public void run() {
53 try {
54 started.countDown();
55 finished.await();
56 } catch (InterruptedException e) {
57 fail.set(new Exception(
58 "Unexpected InterruptedException"));
59 }
60 }
61 }, THREAD_PREFIX + i);
62 allThreads[i].setDaemon(rand.nextBoolean());
63 allThreads[i].start();
64 }
65
66 started.await();
67 try {
68 ThreadInfo[] allThreadInfos = mbean.dumpAllThreads(false, false);
69 int count = 0;
70 for (int i = 0; i < allThreadInfos.length; i++) {
71 String threadName = allThreadInfos[i].getThreadName();
72 if (threadName.startsWith(THREAD_PREFIX)) {
73 count++;
74 String[] nameAndNumber = threadName.split("-");
75 int threadNum = Integer.parseInt(nameAndNumber[1]);
76 if (allThreads[threadNum].isDaemon() !=
77 allThreadInfos[i].isDaemon()) {
78 throw new RuntimeException(
79 allThreads[threadNum] + " is not like " +
80 allThreadInfos[i] + ". TEST FAILED.");
81 }
82 }
83 }
84 if (count != NUM_THREADS) {
85 throw new RuntimeException("Wrong number of threads examined");
86 }
87 }
88 finally { finished.countDown(); }
89
90 for (int i = 0; i < NUM_THREADS; i++) {
91 allThreads[i].join();
92 }
93 if (fail.get() != null) {
94 throw fail.get();
95 }
96 }
97 }