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 }