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.
103 lines
3.7 KiB
Java
103 lines
3.7 KiB
Java
/*
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* Copyright (c) 2023, 2025, 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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* @summary Stress test of StructuredTaskScope cancellation with running and starting threads
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* @enablePreview
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* @run junit StressCancellation
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*/
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import java.time.Duration;
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import java.util.concurrent.StructuredTaskScope;
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import java.util.concurrent.StructuredTaskScope.Joiner;
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import java.util.concurrent.StructuredTaskScope.Subtask;
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import java.util.concurrent.ThreadFactory;
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import java.util.stream.IntStream;
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import java.util.stream.Stream;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.Arguments;
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import org.junit.jupiter.params.provider.MethodSource;
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import static org.junit.jupiter.api.Assertions.*;
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class StressCancellation {
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static Stream<Arguments> testCases() {
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Stream<ThreadFactory> factories = Stream.of(
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Thread.ofPlatform().factory(),
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Thread.ofVirtual().factory()
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);
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// 0..15 forks before shutdown, 0..15 forks after shutdown
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return factories.flatMap(f -> IntStream.range(0, 256)
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.mapToObj(x -> Arguments.of(f, x & 0x0F, (x & 0xF0) >> 4)));
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}
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/**
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* Test StructuredTaskScope cancellation with running threads and concurrently with
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* threads that are starting. The cancellation should interrupt all running threads,
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* join should wakeup, and close would complete quickly.
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*
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* @param factory the ThreadFactory to use
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* @param beforeCancel the number of subtasks to fork before cancel
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* @param afterCancel the number of subtasks to fork after cancel
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*/
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@ParameterizedTest
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@MethodSource("testCases")
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void test(ThreadFactory factory, int beforeCancel, int afterCancel) throws Exception {
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var joiner = new Joiner<Boolean, Void>() {
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@Override
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public boolean onComplete(Subtask<Boolean> subtask) {
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boolean cancel = subtask.get();
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return cancel;
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}
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@Override
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public Void result() {
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return null;
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}
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};
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try (var scope = StructuredTaskScope.open(joiner, cf -> cf.withThreadFactory(factory))) {
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// fork subtasks
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for (int i = 0; i < beforeCancel; i++) {
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scope.fork(() -> {
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Thread.sleep(Duration.ofDays(1));
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return false;
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});
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}
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// fork subtask to cancel
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scope.fork(() -> true);
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// fork after forking subtask to cancel
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for (int i = 0; i < afterCancel; i++) {
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scope.fork(() -> {
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Thread.sleep(Duration.ofDays(1));
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return false;
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});
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}
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scope.join();
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}
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}
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}
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