103 lines
3.4 KiB
Java
103 lines
3.4 KiB
Java
/*
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* Copyright (C) 2021 THL A29 Limited, a Tencent company. 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 Test virtual thread park when scheduler is a fixed thread pool
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* @requires vm.continuations
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* @modules java.base/java.lang:+open
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* @library /test/lib
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* @run main ParkWithFixedThreadPool
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*/
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import java.util.concurrent.Executor;
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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.ThreadFactory;
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import java.util.concurrent.locks.LockSupport;
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import jdk.test.lib.thread.VThreadScheduler;
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public class ParkWithFixedThreadPool {
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public static void main(String[] args) throws Exception {
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try (var scheduler = new Scheduler(8)) {
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int vthreadCount = 300;
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Thread[] vthreads = new Thread[vthreadCount];
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Runnable target = new Runnable() {
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public void run() {
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int myIndex = -1;
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for (int i = 0; i < vthreadCount; i++) {
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if (vthreads[i] == Thread.currentThread()) {
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myIndex = i;
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break;
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}
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}
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if (myIndex > 0) {
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LockSupport.unpark(vthreads[myIndex - 1]);
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}
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if (myIndex != (vthreadCount - 1)) {
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LockSupport.park();
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}
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}
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};
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ThreadFactory factory = VThreadScheduler.virtualThreadFactory(scheduler);
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for (int i = 0; i < vthreadCount; i++) {
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vthreads[i] = factory.newThread(target);
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}
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for (int i = 0; i < vthreadCount; i++) {
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vthreads[i].start();
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}
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for (int i = 0; i < vthreadCount; i++) {
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vthreads[i].join();
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}
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}
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}
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static class Scheduler implements Executor, AutoCloseable {
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private final ExecutorService pool;
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Scheduler(int poolSize) {
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pool = Executors.newFixedThreadPool(poolSize);
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}
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@Override
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public void execute(Runnable task) {
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try {
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pool.execute(task);
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} finally {
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// ExecutorService::execute may consume parking permit
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LockSupport.unpark(Thread.currentThread());
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}
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}
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@Override
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public void close() {
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pool.close();
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}
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}
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}
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