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/*
* Copyright (c) 2006, 2012, 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 6431315
* @summary ExecutorService.invokeAll might hang
* @author Martin Buchholz
* @library /lib/testlibrary/
*/
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.util.ArrayList;
import java.util.Collection;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.RejectedExecutionException;
import jdk.testlibrary.Utils;
/**
* Adapted from Doug Lea, which was...
* adapted from a posting by Tom Sugden tom at epcc.ed.ac.uk
*/
public class BlockingTaskExecutor {
static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
static void realMain(String[] args) throws Throwable {
for (int i = 1; i <= 100; i++) {
System.out.print(".");
test();
}
}
static void test() throws Throwable {
final ExecutorService executor = Executors.newCachedThreadPool();
final NotificationReceiver notifiee1 = new NotificationReceiver();
final NotificationReceiver notifiee2 = new NotificationReceiver();
final Collection<Callable<Object>> tasks = new ArrayList<>();
tasks.add(new BlockingTask(notifiee1));
tasks.add(new BlockingTask(notifiee2));
tasks.add(new NonBlockingTask());
// start a thread to invoke the tasks
Thread thread = new Thread() { public void run() {
try { executor.invokeAll(tasks); }
catch (RejectedExecutionException t) {/* OK */}
catch (Throwable t) { unexpected(t); }}};
thread.start();
// Wait until tasks begin execution
notifiee1.waitForNotification();
notifiee2.waitForNotification();
// Now try to shutdown the executor service while tasks
// are blocked. This should cause the tasks to be
// interrupted.
executor.shutdownNow();
if (! executor.awaitTermination(LONG_DELAY_MS, MILLISECONDS))
throw new Error(
String.format("Executor termination timed out after %d ms",
LONG_DELAY_MS));
// Wait for the invocation thread to complete.
thread.join(LONG_DELAY_MS);
if (thread.isAlive()) {
thread.interrupt();
thread.join(LONG_DELAY_MS);
throw new Error(
String.format("invokeAll timed out after %d ms",
LONG_DELAY_MS));
}
}
/**
* A helper class with a method to wait for a notification.
*
* The notification is received via the
* {@code sendNotification} method.
*/
static class NotificationReceiver {
/** Has the notifiee been notified? */
boolean notified = false;
/**
* Notify the notification receiver.
*/
public synchronized void sendNotification() {
notified = true;
notifyAll();
}
/**
* Waits until a notification has been received.
*
* @throws InterruptedException if the wait is interrupted
*/
public synchronized void waitForNotification()
throws InterruptedException {
while (! notified)
wait();
}
}
/**
* A callable task that blocks until it is interrupted.
* This task sends a notification to a notification receiver when
* it is first called.
*/
static class BlockingTask implements Callable<Object> {
private final NotificationReceiver notifiee;
BlockingTask(NotificationReceiver notifiee) {
this.notifiee = notifiee;
}
public Object call() throws InterruptedException {
notifiee.sendNotification();
// wait indefinitely until task is interrupted
while (true) {
synchronized (this) {
wait();
}
}
}
}
/**
* A callable task that simply returns a string result.
*/
static class NonBlockingTask implements Callable<Object> {
public Object call() {
return "NonBlockingTaskResult";
}
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static void pass() {passed++;}
static void fail() {failed++; Thread.dumpStack();}
static void fail(String msg) {System.out.println(msg); fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static void check(boolean cond) {if (cond) pass(); else fail();}
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}
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