78 lines
2.6 KiB
Java
78 lines
2.6 KiB
Java
/*
|
|
* 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.");
|
|
}
|
|
}
|
|
}
|