107 lines
4.0 KiB
Java
107 lines
4.0 KiB
Java
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Martin Buchholz with assistance from members of JCP
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* JSR-166 Expert Group and released to the public domain, as
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* explained at http://creativecommons.org/publicdomain/zero/1.0/
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*/
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/*
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* @test
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* @bug 8073704
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* @summary Checks that once isDone() returns true,
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* get() never throws InterruptedException or TimeoutException
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* @library /test/lib
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*/
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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import java.util.ArrayList;
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import java.util.concurrent.Callable;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.concurrent.FutureTask;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicReference;
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import jdk.test.lib.Utils;
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public class DoneMeansDone {
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static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
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public static void main(String[] args) throws Throwable {
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final int iters = 1000;
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final int nThreads = 2;
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final AtomicBoolean done = new AtomicBoolean(false);
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final AtomicReference<FutureTask<Boolean>> a = new AtomicReference<>();
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final CountDownLatch threadsStarted = new CountDownLatch(nThreads);
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final Callable<Boolean> alwaysTrue = new Callable<>() {
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public Boolean call() {
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return true;
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}};
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final Runnable observer = new Runnable() { public void run() {
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threadsStarted.countDown();
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final ThreadLocalRandom rnd = ThreadLocalRandom.current();
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try {
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for (FutureTask<Boolean> f; !done.get();) {
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f = a.get();
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if (f != null) {
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do {} while (!f.isDone());
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Thread.currentThread().interrupt();
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if (!(rnd.nextBoolean()
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? f.get()
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: f.get(-1L, TimeUnit.DAYS)))
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throw new AssertionError();
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}
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}
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} catch (Exception t) { throw new AssertionError(t); }
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}};
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final ArrayList<Future<?>> futures = new ArrayList<>(nThreads);
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final ExecutorService pool = Executors.newCachedThreadPool();
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for (int i = 0; i < nThreads; i++)
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futures.add(pool.submit(observer));
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threadsStarted.await();
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for (int i = 0; i < iters; i++) {
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FutureTask<Boolean> f = new FutureTask<>(alwaysTrue);
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a.set(f);
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f.run();
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}
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done.set(true);
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pool.shutdown();
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if (!pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS))
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throw new AssertionError();
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for (Future<?> future : futures)
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future.get();
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}
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}
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