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  */

    35 public class ThreadDaemonTest {

    36 

    37     public static void main(String[] args) throws Exception {

    38         final int NUM_THREADS = 20;

    39         final String THREAD_PREFIX = "ThreadDaemonTest-";

    40 

    41         final CountDownLatch started = new CountDownLatch(NUM_THREADS);

    42         final CountDownLatch finished = new CountDownLatch(1);

    43         final AtomicReference<Exception> fail = new AtomicReference<>(null);

    44 

    45         Thread[] allThreads = new Thread[NUM_THREADS];

    46         ThreadMXBean mbean = ManagementFactory.getThreadMXBean();

    47         Random rand = new Random();

    48 

    49         for (int i = 0; i < NUM_THREADS; i++) {

    50             allThreads[i] = new Thread(new Runnable() {

    51                     public void run() {

    52                         try {

    53                             started.countDown();

    54                             finished.await();

    55                         } catch (InterruptedException e) {

    56                             fail.set(new Exception(

    57                                 "Unexpected InterruptedException"));

    58                         }

    59                     }

    60                 }, THREAD_PREFIX + i);

    61             allThreads[i].setDaemon(rand.nextBoolean());

    62             allThreads[i].start();

    63         }

    64 

    65         started.await();

    66         try {

    67             ThreadInfo[] allThreadInfos = mbean.dumpAllThreads(false, false);

    68             int count = 0;

    69             for (int i = 0; i < allThreadInfos.length; i++) {

    70                 String threadName = allThreadInfos[i].getThreadName();

    71                 if (threadName.startsWith(THREAD_PREFIX)) {

    72                     count++;

    73                     String[] nameAndNumber = threadName.split("-");

    74                     int threadNum = Integer.parseInt(nameAndNumber[1]);

    75                     if (allThreads[threadNum].isDaemon() !=

    76                         allThreadInfos[i].isDaemon()) {

    77                         throw new RuntimeException(

    78                             allThreads[threadNum] + " is not like " +

    79                             allThreadInfos[i] + ". TEST FAILED.");

    80                     }

    81                 }

    82             }

    83             if (count != NUM_THREADS) {

    84                 throw new RuntimeException("Wrong number of threads examined");

    85             }

    86         }

    87         finally { finished.countDown(); }

    88 

    89         for (int i = 0; i < NUM_THREADS; i++) {

    90             allThreads[i].join();

    91         }

    92         if (fail.get() != null) {

    93             throw fail.get();

    94         }

    95     }

    96 }