1 /* 2 * Copyright (c) 1999, 2011, 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 4176355 27 * @summary Stopping a ThreadGroup that contains the current thread has 28 * unpredictable results. 29 */ 30 31 public class Stop implements Runnable { 32 private static boolean groupStopped = false ; 33 private static final Object lock = new Object(); 34 35 private static final ThreadGroup group = new ThreadGroup(""); 36 private static final Thread first = new Thread(group, new Stop()); 37 private static final Thread second = new Thread(group, new Stop()); 38 39 public void run() { 40 while (true) { 41 // Give the other thread a chance to start 42 try { 43 Thread.sleep(1000); 44 } catch (InterruptedException e) { 45 } 46 47 // When the first thread runs, it will stop the group. 48 if (Thread.currentThread() == first) { 49 synchronized (lock) { 50 try { 51 group.stop(); 52 } finally { 53 // Signal the main thread it is time to check 54 // that the stopped thread group was successful 55 groupStopped = true; 56 lock.notifyAll(); 57 } 58 } 59 } 60 } 61 } 62 63 public static void main(String[] args) throws Exception { 64 // Launch two threads as part of the same thread group 65 first.start(); 66 second.start(); 67 68 // Wait for the thread group stop to be issued 69 synchronized(lock){ 70 while (!groupStopped) { 71 lock.wait(); 72 // Give the other thread a chance to stop 73 Thread.sleep(1000); 74 } 75 } 76 77 // Check that the second thread is terminated when the 78 // first thread terminates the thread group. 79 boolean failed = second.isAlive(); 80 81 // Clean up any threads that may have not been terminated 82 first.stop(); 83 second.stop(); 84 if (failed) 85 throw new RuntimeException("Failure."); 86 } 87 } | 1 /* 2 * Copyright (c) 1999, 2016, 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 4176355 27 * @summary Stopping a ThreadGroup that contains the current thread has 28 * unpredictable results. 29 */ 30 31 public class Stop implements Runnable { 32 private static volatile boolean groupStopped = false ; 33 private static final int MAX_RETRY = 5; 34 private static final Object lock = new Object(); 35 36 private static final ThreadGroup group = new ThreadGroup(""); 37 private static final Thread first = new Thread(group, new Stop()); 38 private static final Thread second = new Thread(group, new Stop()); 39 40 public void run() { 41 while (true) { 42 // Give the other thread a chance to start 43 try { 44 Thread.sleep(1000); 45 } catch (InterruptedException e) { 46 } 47 48 // When the first thread runs, it will stop the group. 49 if (Thread.currentThread() == first) { 50 synchronized (lock) { 51 try { 52 group.stop(); 53 } finally { 54 // Signal the main thread it is time to check 55 // that the stopped thread group was successful 56 groupStopped = true; 57 lock.notifyAll(); 58 } 59 } 60 } 61 } 62 } 63 64 public static void main(String[] args) throws Exception { 65 // Launch two threads as part of the same thread group 66 first.start(); 67 second.start(); 68 69 // Wait for the thread group stop to be issued 70 int numTries = 0; 71 synchronized(lock){ 72 while (!groupStopped && numTries++ < MAX_RETRY) { 73 lock.wait(); 74 // Give the other thread a chance to stop 75 Thread.sleep(1000); 76 } 77 } 78 79 // Check that the second thread is terminated when the 80 // first thread terminates the thread group. 81 boolean failed = second.isAlive(); 82 83 // Clean up any threads that may have not been terminated 84 first.stop(); 85 second.stop(); 86 if (failed) 87 throw new RuntimeException("Failure."); 88 } 89 } |