| /* |
| * 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. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Written by Martin Buchholz with assistance from members of JCP |
| * JSR-166 Expert Group and released to the public domain, as |
| * explained at http://creativecommons.org/publicdomain/zero/1.0/ |
| */ |
| |
| /* |
| * @test |
| * @bug 8073704 |
| * @summary Checks that once isDone() returns true, |
| * get() never throws InterruptedException or TimeoutException |
| * @library /lib/testlibrary/ |
| */ |
| |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| import java.util.ArrayList; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.FutureTask; |
| import java.util.concurrent.ThreadLocalRandom; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.atomic.AtomicReference; |
| import jdk.testlibrary.Utils; |
| |
| public class DoneMeansDone { |
| static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000); |
| |
| public static void main(String[] args) throws Throwable { |
| final int iters = 1000; |
| final int nThreads = 2; |
| final AtomicBoolean done = new AtomicBoolean(false); |
| final AtomicReference<FutureTask<Boolean>> a = new AtomicReference<>(); |
| final CountDownLatch threadsStarted = new CountDownLatch(nThreads); |
| final Callable<Boolean> alwaysTrue = new Callable<>() { |
| public Boolean call() { |
| return true; |
| }}; |
| |
| final Runnable observer = new Runnable() { public void run() { |
| threadsStarted.countDown(); |
| final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
| try { |
| for (FutureTask<Boolean> f; !done.get();) { |
| f = a.get(); |
| if (f != null) { |
| do {} while (!f.isDone()); |
| Thread.currentThread().interrupt(); |
| if (!(rnd.nextBoolean() |
| ? f.get() |
| : f.get(-1L, TimeUnit.DAYS))) |
| throw new AssertionError(); |
| } |
| } |
| } catch (Exception t) { throw new AssertionError(t); } |
| }}; |
| |
| final ArrayList<Future<?>> futures = new ArrayList<>(nThreads); |
| final ExecutorService pool = Executors.newCachedThreadPool(); |
| for (int i = 0; i < nThreads; i++) |
| futures.add(pool.submit(observer)); |
| threadsStarted.await(); |
| for (int i = 0; i < iters; i++) { |
| FutureTask<Boolean> f = new FutureTask<>(alwaysTrue); |
| a.set(f); |
| f.run(); |
| } |
| done.set(true); |
| pool.shutdown(); |
| if (!pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS)) |
| throw new AssertionError(); |
| for (Future<?> future : futures) |
| future.get(); |
| } |
| } |