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test/java/lang/ThreadGroup/Stop.java
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@@ -1,7 +1,7 @@
/*
- * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2016, 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.
@@ -22,66 +22,80 @@
*/
/**
* @test
* @bug 4176355
+ * @library /test/lib/share/classes
+ * @modules java.base/jdk.internal.misc
* @summary Stopping a ThreadGroup that contains the current thread has
* unpredictable results.
*/
-public class Stop implements Runnable {
- private static boolean groupStopped = false ;
- private static final Object lock = new Object();
+import java.util.concurrent.CountDownLatch;
+import jdk.test.lib.Utils;
+
+public class Stop {
+
+ private static final long LONG_DELAY_MS = Utils.adjustTimeout(5000L);
+ private static final CountDownLatch ready = new CountDownLatch(1);
+ private static final CountDownLatch done = new CountDownLatch(2);
private static final ThreadGroup group = new ThreadGroup("");
- private static final Thread first = new Thread(group, new Stop());
- private static final Thread second = new Thread(group, new Stop());
- public void run() {
- while (true) {
- // Give the other thread a chance to start
+ private static final Thread second = new Thread(group, () -> {
+ ready.countDown();
try {
- Thread.sleep(1000);
- } catch (InterruptedException e) {
+ while (true) {
+ // keep it alive
+ }
+ } catch (final ThreadDeath td) {
+ done.countDown();
+ throw td;
}
+ });
- // When the first thread runs, it will stop the group.
- if (Thread.currentThread() == first) {
- synchronized (lock) {
+ private static final Thread first = new Thread(group, () -> {
+ // Wait until "second" is started
+ await(ready);
try {
+ // Now stop the group
+ // ThreadDeath then is thrown in the victim threads
group.stop();
- } finally {
- // Signal the main thread it is time to check
- // that the stopped thread group was successful
- groupStopped = true;
- lock.notifyAll();
- }
- }
+ } catch (final ThreadDeath td) {
+ // Inform the main thead that the test thread has completed
+ done.countDown();
+ // Rethrow the object so that the thread actually dies
+ throw td;
}
+ });
+
+ private static void await(CountDownLatch latch) {
+ try {
+ latch.await();
+ } catch (InterruptedException e) {
+ throw new RuntimeException(e);
}
}
public static void main(String[] args) throws Exception {
// Launch two threads as part of the same thread group
first.start();
second.start();
+ try {
// Wait for the thread group stop to be issued
- synchronized(lock){
- while (!groupStopped) {
- lock.wait();
- // Give the other thread a chance to stop
- Thread.sleep(1000);
- }
- }
+ await(done);
// Check that the second thread is terminated when the
// first thread terminates the thread group.
+ second.join(LONG_DELAY_MS);
boolean failed = second.isAlive();
-
+ if (failed) {
+ throw new RuntimeException("Failure.");
+ }
+ } finally {
// Clean up any threads that may have not been terminated
first.stop();
second.stop();
- if (failed)
- throw new RuntimeException("Failure.");
+ }
}
}
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