russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
78 lines
3 KiB
Java
78 lines
3 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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* @test
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* @bug 8371740
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* @summary Checks for poll() (or peek) returning null when an element must exist.
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*/
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import java.util.*;
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import java.util.concurrent.*;
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public class MissedPoll {
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public static void main(String... args) throws Throwable {
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test(new LinkedTransferQueue<>());
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test(new LinkedBlockingQueue<>());
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test(new LinkedBlockingDeque<>());
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test(new ArrayBlockingQueue<>(10));
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}
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private static void test(BlockingQueue<Integer> q)
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throws ExecutionException, InterruptedException {
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System.out.println(q.getClass());
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try (var pool = Executors.newCachedThreadPool()) {
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var futures = new ArrayList<Future<Integer>>();
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var phaser = new Phaser(4) {
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@Override
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protected boolean onAdvance(int phase, int registeredParties) {
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q.clear();
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return super.onAdvance(phase, registeredParties);
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}
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};
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for (var i = 0; i < 4; i++) {
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futures.add(pool.submit(() -> {
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int errors = 0;
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for (int k = 0; k < 10; k++) {
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for (int j = 0; j < 1000; j++) {
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q.offer(j);
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if (q.peek() == null)
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++errors;
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if (q.poll() == null)
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++errors;
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}
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phaser.arriveAndAwaitAdvance();
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}
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return errors;
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}));
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}
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for (var future : futures) {
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Integer res;
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if ((res = future.get()) != 0)
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throw new AssertionError("Expected 0 but got " + res);
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}
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}
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if (!q.isEmpty())
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throw new AssertionError("Queue is not empty: " + q);
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}
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}
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