| /* |
| * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 4176355 7181748 |
| * @summary Suspending a ThreadGroup that contains the current thread has |
| * unpredictable results. |
| */ |
| |
| public class Suspend implements Runnable { |
| |
| private static volatile int count = 0; |
| private static final ThreadGroup group = new ThreadGroup(""); |
| private static final Thread first = new Thread(group, new Suspend()); |
| private static final Thread second = new Thread(group, new Suspend()); |
| |
| public void run() { |
| while (true) { |
| try { |
| Thread.sleep(100); |
| if (Thread.currentThread() == first) { |
| if (second.isAlive()) { |
| group.suspend(); |
| } |
| } else { |
| count++; |
| } |
| } catch (InterruptedException e) { |
| } |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| // Launch two threads as part of the same thread group |
| first.start(); |
| second.start(); |
| |
| // Wait for the thread group suspend to be issued |
| while (!first.isAlive() || !second.isAlive()) { |
| Thread.sleep(100); |
| } |
| Thread.sleep(1000); |
| // Suppose, the thread group is now suspended |
| |
| count = 0; |
| Thread.sleep(1000); |
| |
| // Increment of the count indicates that the second thread is still running |
| boolean failed = (count > 1); |
| first.stop(); |
| second.stop(); |
| if (failed) { |
| throw new RuntimeException("Failure."); |
| } |
| } |
| } |