97 lines
3.5 KiB
Java
97 lines
3.5 KiB
Java
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/*
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* Copyright (c) 2022, 2023, 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 8284161 8286788
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* @summary Test that a carrier thread waits on a virtual thread
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* @requires vm.continuations
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* @modules java.base/java.lang:+open
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* @run junit CarrierThreadWaits
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*/
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/**
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* @test
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* @requires vm.continuations & vm.debug
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* @modules java.base/java.lang:+open
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* @run junit/othervm -XX:+UseHeavyMonitors CarrierThreadWaits
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*/
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import java.lang.management.LockInfo;
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadInfo;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.Executor;
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import java.util.concurrent.ForkJoinPool;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicReference;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.*;
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class CarrierThreadWaits {
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@Test
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void testCarrierThreadWaiting() throws Exception {
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try (ForkJoinPool pool = new ForkJoinPool(1)) {
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var carrierRef = new AtomicReference<Thread>();
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Executor scheduler = task -> {
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pool.submit(() -> {
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carrierRef.set(Thread.currentThread());
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task.run();
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});
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};
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// start a virtual thread that spins and remains mounted until "done"
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var latch = new CountDownLatch(1);
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var done = new AtomicBoolean();
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Thread.Builder builder = ThreadBuilders.virtualThreadBuilder(scheduler);
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Thread vthread = builder.start(() -> {
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latch.countDown();
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while (!done.get()) {
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Thread.onSpinWait();
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}
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});
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// wait for virtual thread to execute
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latch.await();
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try {
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long carrierId = carrierRef.get().threadId();
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long vthreadId = vthread.threadId();
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// carrier thread should be on WAITING on virtual thread
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ThreadInfo ti = ManagementFactory.getThreadMXBean().getThreadInfo(carrierId);
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assertTrue(ti.getThreadState() == Thread.State.WAITING);
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assertEquals(vthread.getClass().getName(), ti.getLockInfo().getClassName());
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assertTrue(ti.getLockInfo().getIdentityHashCode() == System.identityHashCode(vthread));
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assertTrue(ti.getLockOwnerId() == vthreadId);
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} finally {
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done.set(true);
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}
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}
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}
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}
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