113 lines
4.6 KiB
Java
113 lines
4.6 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 Doug Lea and Martin Buchholz with assistance from
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* members of JCP JSR-166 Expert Group and released to the public
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* domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.VarHandle;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.ForkJoinPool;
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import java.util.concurrent.ForkJoinTask;
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import java.util.concurrent.Future;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.stream.Stream;
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import junit.framework.Test;
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import junit.framework.TestSuite;
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public class ForkJoinPool9Test extends JSR166TestCase {
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public static void main(String[] args) {
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main(suite(), args);
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}
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public static Test suite() {
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return new TestSuite(ForkJoinPool9Test.class);
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}
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/**
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* Check handling of common pool thread context class loader
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*/
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public void testCommonPoolThreadContextClassLoader() throws Throwable {
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if (!testImplementationDetails) return;
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// Ensure common pool has at least one real thread
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String prop = System.getProperty(
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"java.util.concurrent.ForkJoinPool.common.parallelism");
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if ("0".equals(prop)) return;
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VarHandle CCL =
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MethodHandles.privateLookupIn(Thread.class, MethodHandles.lookup())
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.findVarHandle(Thread.class, "contextClassLoader", ClassLoader.class);
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ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
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boolean haveSecurityManager = (System.getSecurityManager() != null);
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CountDownLatch runInCommonPoolStarted = new CountDownLatch(1);
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ClassLoader classLoaderDistinctFromSystemClassLoader
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= ClassLoader.getPlatformClassLoader();
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assertNotSame(classLoaderDistinctFromSystemClassLoader,
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systemClassLoader);
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Runnable runInCommonPool = () -> {
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runInCommonPoolStarted.countDown();
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assertTrue(ForkJoinTask.inForkJoinPool());
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assertSame(ForkJoinPool.commonPool(), ForkJoinTask.getPool());
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Thread currentThread = Thread.currentThread();
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Stream.of(systemClassLoader, null).forEach(cl -> {
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if (ThreadLocalRandom.current().nextBoolean())
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// should always be permitted, without effect
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currentThread.setContextClassLoader(cl);
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});
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Stream.of(currentThread.getContextClassLoader(),
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(ClassLoader) CCL.get(currentThread))
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.forEach(cl -> assertTrue(cl == systemClassLoader || cl == null));
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if (haveSecurityManager)
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assertThrows(
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SecurityException.class,
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() -> System.getProperty("foo"),
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() -> currentThread.setContextClassLoader(
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classLoaderDistinctFromSystemClassLoader));
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// TODO ?
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// if (haveSecurityManager
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// && Thread.currentThread().getClass().getSimpleName()
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// .equals("InnocuousForkJoinWorkerThread"))
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// assertThrows(SecurityException.class, /* ?? */);
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};
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Future<?> f = ForkJoinPool.commonPool().submit(runInCommonPool);
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// Ensure runInCommonPool is truly running in the common pool,
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// by giving this thread no opportunity to "help" on get().
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await(runInCommonPoolStarted);
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assertNull(f.get());
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}
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}
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