| /* |
| * 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 |
| */ |
| |
| 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 java.util.concurrent.TimeUnit; |
| |
| /** |
| * Adapted from Doug Lea, which was... |
| * adapted from a posting by Tom Sugden tom at epcc.ed.ac.uk |
| */ |
| public class BlockingTaskExecutor { |
| |
| 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(5L, TimeUnit.SECONDS)) |
| throw new Error("Executor stuck"); |
| |
| // Wait for the invocation thread to complete. |
| thread.join(5000); |
| if (thread.isAlive()) { |
| thread.interrupt(); |
| thread.join(5000); |
| throw new Error("invokeAll stuck"); |
| } |
| } |
| |
| /** |
| * 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");} |
| } |