789f704d9a
8327854: Test java/util/stream/test/org/openjdk/tests/java/util/stream/WhileOpStatefulTest.java failed with RuntimeException Reviewed-by: alanb
57 lines
2.1 KiB
Java
57 lines
2.1 KiB
Java
/*
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* Copyright (c) 2004, 2024, Oracle and/or its affiliates. All rights reserved.
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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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* @test
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* @bug 8322732
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* @summary ForkJoinPool utilizes available workers even with arbitrary task dependencies
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*/
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import java.util.concurrent.Callable;
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import java.util.concurrent.ForkJoinPool;
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import java.util.concurrent.atomic.AtomicInteger;
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public class Starvation {
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static final AtomicInteger count = new AtomicInteger();
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static final Callable<Void> noop = new Callable<Void>() {
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public Void call() {
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return null; }};
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static final class AwaitCount implements Callable<Void> {
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private int c;
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AwaitCount(int c) { this.c = c; }
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public Void call() {
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while (count.get() == c) Thread.onSpinWait();
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return null; }};
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public static void main(String[] args) throws Exception {
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try (var pool = new ForkJoinPool(2)) {
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for (int i = 0; i < 100_000; i++) {
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var future1 = pool.submit(new AwaitCount(i));
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var future2 = pool.submit(noop);
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future2.get();
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count.set(i + 1);
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future1.get();
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}
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}
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}
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}
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