391 lines
14 KiB
Java
391 lines
14 KiB
Java
/*
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* Copyright (c) 2020, 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 id=default
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* @bug 8284161 8290562 8303242
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* @summary Test java.lang.management.ThreadMXBean with virtual threads
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* @modules java.base/java.lang:+open java.management
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* @library /test/lib
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* @run junit/othervm VirtualThreads
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*/
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/**
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* @test id=no-vmcontinuations
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* @requires vm.continuations
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* @modules java.base/java.lang:+open java.management
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* @library /test/lib
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* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations VirtualThreads
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*/
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadInfo;
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import java.lang.management.ThreadMXBean;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.nio.channels.Selector;
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import java.util.Arrays;
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import java.util.Set;
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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.atomic.AtomicReference;
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import java.util.concurrent.locks.LockSupport;
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import java.util.stream.Collectors;
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import jdk.test.lib.thread.VThreadRunner;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.ValueSource;
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import static org.junit.jupiter.api.Assertions.*;
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import static org.junit.jupiter.api.Assumptions.*;
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public class VirtualThreads {
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/**
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* Test that ThreadMXBean.dumpAllThreads does not include virtual threads.
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*/
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@ParameterizedTest
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@ValueSource(ints = {0, Integer.MAX_VALUE})
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void testDumpAllThreads(int maxDepth) {
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Thread vthread = Thread.startVirtualThread(LockSupport::park);
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try {
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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ThreadInfo[] infos = bean.dumpAllThreads(false, false, maxDepth);
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Set<Long> tids = Arrays.stream(infos)
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.map(ThreadInfo::getThreadId)
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.collect(Collectors.toSet());
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// if current thread is a platform thread then it should be included
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boolean expected = !Thread.currentThread().isVirtual();
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assertEquals(expected, tids.contains(Thread.currentThread().threadId()));
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// virtual thread should not be included
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assertFalse(tids.contains(vthread.threadId()));
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} finally {
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LockSupport.unpark(vthread);
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}
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}
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/**
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* Test that ThreadMXBean::getAllThreadsIds does not include virtual threads.
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*/
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@Test
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void testGetAllThreadIds() {
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Thread vthread = Thread.startVirtualThread(LockSupport::park);
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try {
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long[] tids = ManagementFactory.getThreadMXBean().getAllThreadIds();
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// if current thread is a platform thread then it should be included
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boolean expected = !Thread.currentThread().isVirtual();
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long currentTid = Thread.currentThread().threadId();
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assertEquals(expected, Arrays.stream(tids).anyMatch(tid -> tid == currentTid));
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// virtual thread should not be included
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long vtid = vthread.threadId();
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assertFalse(Arrays.stream(tids).anyMatch(tid -> tid == vtid));
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} finally {
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LockSupport.unpark(vthread);
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}
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}
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/**
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* Test that ThreadMXBean.getThreadInfo(long, maxDepth) returns null for a virtual
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* thread.
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*/
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@ParameterizedTest
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@ValueSource(ints = {0, Integer.MAX_VALUE})
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void testGetThreadInfo1(int maxDepth) {
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Thread vthread = Thread.startVirtualThread(LockSupport::park);
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try {
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long tid = vthread.threadId();
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ThreadInfo info = ManagementFactory.getThreadMXBean().getThreadInfo(tid, maxDepth);
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assertNull(info);
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} finally {
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LockSupport.unpark(vthread);
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}
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}
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/**
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* Test that ThreadMXBean.getThreadInfo(long, maxDepth) returns null when invoked
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* by a virtual thread with its own thread id.
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*/
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@ParameterizedTest
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@ValueSource(ints = {0, Integer.MAX_VALUE})
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void testGetThreadInfo2(int maxDepth) throws Exception {
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VThreadRunner.run(() -> {
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long tid = Thread.currentThread().threadId();
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ThreadInfo info = ManagementFactory.getThreadMXBean().getThreadInfo(tid, maxDepth);
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assertNull(info);
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});
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}
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/**
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* Test that ThreadMXBean.getThreadInfo(long[], maxDepth) returns a null ThreadInfo
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* for elements that correspond to a virtual thread.
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*/
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@ParameterizedTest
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@ValueSource(ints = {0, Integer.MAX_VALUE})
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void testGetThreadInfo3(int maxDepth) {
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Thread vthread = Thread.startVirtualThread(LockSupport::park);
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try {
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long tid0 = Thread.currentThread().threadId();
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long tid1 = vthread.threadId();
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long[] tids = new long[] { tid0, tid1 };
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ThreadInfo[] infos = ManagementFactory.getThreadMXBean().getThreadInfo(tids, maxDepth);
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if (Thread.currentThread().isVirtual()) {
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assertNull(infos[0]);
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} else {
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assertEquals(tid0, infos[0].getThreadId());
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}
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assertNull(infos[1]);
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} finally {
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LockSupport.unpark(vthread);
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}
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}
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/**
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* Test that ThreadMXBean.getThreadInfo(long[], boolean, boolean, maxDepth) returns
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* a null ThreadInfo for elements that correspond to a virtual thread.
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*/
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@ParameterizedTest
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@ValueSource(ints = {0, Integer.MAX_VALUE})
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void testGetThreadInfo4(int maxDepth) {
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Thread vthread = Thread.startVirtualThread(LockSupport::park);
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try {
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long tid0 = Thread.currentThread().threadId();
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long tid1 = vthread.threadId();
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long[] tids = new long[] { tid0, tid1 };
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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ThreadInfo[] infos = bean.getThreadInfo(tids, false, false, maxDepth);
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if (Thread.currentThread().isVirtual()) {
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assertNull(infos[0]);
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} else {
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assertEquals(tid0, infos[0].getThreadId());
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}
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assertNull(infos[1]);
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} finally {
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LockSupport.unpark(vthread);
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}
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}
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/**
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* Test ThreadMXBean.getThreadInfo(long) with the thread id of a carrier thread.
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* The stack frames of the virtual thread should not be returned.
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*/
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@Test
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void testGetThreadInfoCarrierThread() throws Exception {
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assumeTrue(supportsCustomScheduler(), "No support for custom schedulers");
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try (ExecutorService pool = Executors.newFixedThreadPool(1)) {
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var carrierRef = new AtomicReference<Thread>();
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Executor scheduler = (task) -> {
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pool.execute(() -> {
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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 virtual thread so carrier Thread can be captured
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virtualThreadBuilder(scheduler).start(() -> { }).join();
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Thread carrier = carrierRef.get();
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assertTrue(carrier != null && !carrier.isVirtual());
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try (Selector sel = Selector.open()) {
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// start virtual thread that blocks in a native method
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virtualThreadBuilder(scheduler).start(() -> {
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try {
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sel.select();
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} catch (Exception e) { }
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});
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// invoke getThreadInfo get and check the stack trace
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long tid = carrier.getId();
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ThreadInfo info = ManagementFactory.getThreadMXBean().getThreadInfo(tid, 100);
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// should only see carrier frames
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StackTraceElement[] stack = info.getStackTrace();
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assertTrue(contains(stack, "java.util.concurrent.ThreadPoolExecutor"));
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assertFalse(contains(stack, "java.nio.channels.Selector"));
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// carrier should not be holding any monitors
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assertEquals(0, info.getLockedMonitors().length);
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}
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}
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}
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/**
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* Test that ThreadMXBean.getThreadCpuTime(long) returns -1 for a virtual thread.
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*/
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@Test
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void testGetThreadCpuTime1() {
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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assumeTrue(bean.isThreadCpuTimeSupported(), "Thread CPU time measurement not supported");
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Thread vthread = Thread.startVirtualThread(LockSupport::park);
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try {
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long tid = vthread.threadId();
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long cpuTime = bean.getThreadCpuTime(tid);
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assertEquals(-1L, cpuTime);
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} finally {
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LockSupport.unpark(vthread);
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}
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}
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/**
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* Test that ThreadMXBean.getThreadCpuTime(long) returns -1 when invoked by a
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* virtual thread with its own thread id.
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*/
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@Test
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void testGetThreadCpuTime2() throws Exception {
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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assumeTrue(bean.isThreadCpuTimeSupported(), "Thread CPU time measurement not supported");
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VThreadRunner.run(() -> {
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long tid = Thread.currentThread().threadId();
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long cpuTime = bean.getThreadCpuTime(tid);
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assertEquals(-1L, cpuTime);
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});
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}
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/**
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* Test that ThreadMXBean.getThreadUserTime(long) returns -1 for a virtual thread.
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*/
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@Test
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void testGetThreadUserTime1() {
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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assumeTrue(bean.isThreadCpuTimeSupported(), "Thread CPU time measurement not supported");
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Thread vthread = Thread.startVirtualThread(LockSupport::park);
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try {
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long tid = vthread.threadId();
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long userTime = ManagementFactory.getThreadMXBean().getThreadUserTime(tid);
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assertEquals(-1L, userTime);
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} finally {
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LockSupport.unpark(vthread);
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}
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}
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/**
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* Test that ThreadMXBean.getThreadUserTime(long) returns -1 when invoked by a
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* virtual thread with its own thread id.
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*/
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@Test
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void testGetThreadUserTime2() throws Exception {
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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assumeTrue(bean.isThreadCpuTimeSupported(), "Thread CPU time measurement not supported");
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VThreadRunner.run(() -> {
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long tid = Thread.currentThread().threadId();
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long userTime = ManagementFactory.getThreadMXBean().getThreadUserTime(tid);
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assertEquals(-1L, userTime);
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});
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}
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/**
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* Test that ThreadMXBean::isCurrentThreadCpuTimeSupported returns true when
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* CPU time measurement for the current thread is supported.
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*/
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@Test
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void testIsCurrentThreadCpuTimeSupported() throws Exception {
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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assumeTrue(bean.isCurrentThreadCpuTimeSupported(),
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"Thread CPU time measurement for the current thread not supported");
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VThreadRunner.run(() -> {
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assertTrue(bean.isCurrentThreadCpuTimeSupported());
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});
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}
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/**
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* Test that ThreadMXBean::getCurrentThreadCpuTime returns -1 when invoked
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* from a virtual thread.
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*/
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@Test
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void testGetCurrentThreadCpuTime() throws Exception {
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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assumeTrue(bean.isCurrentThreadCpuTimeSupported(),
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"Thread CPU time measurement for the current thread not supported");
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VThreadRunner.run(() -> {
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assertEquals(-1L, bean.getCurrentThreadCpuTime());
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});
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}
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/**
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* Test that ThreadMXBean::getCurrentThreadUserTime returns -1 when invoked
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* from a virtual thread.
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*/
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@Test
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void testGetCurrentThreadUserTime() throws Exception {
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ThreadMXBean bean = ManagementFactory.getThreadMXBean();
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assumeTrue(bean.isCurrentThreadCpuTimeSupported(),
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"Thread CPU time measurement for the current thread not supported");
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VThreadRunner.run(() -> {
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assertEquals(-1L, bean.getCurrentThreadUserTime());
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});
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}
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private static boolean contains(StackTraceElement[] stack, String className) {
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return Arrays.stream(stack)
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.map(StackTraceElement::getClassName)
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.anyMatch(className::equals);
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}
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/**
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* Returns a builder to create virtual threads that use the given scheduler.
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* @throws UnsupportedOperationException if there is no support for custom schedulers
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*/
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private static Thread.Builder.OfVirtual virtualThreadBuilder(Executor scheduler) {
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Thread.Builder.OfVirtual builder = Thread.ofVirtual();
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try {
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Class<?> clazz = Class.forName("java.lang.ThreadBuilders$VirtualThreadBuilder");
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Constructor<?> ctor = clazz.getDeclaredConstructor(Executor.class);
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ctor.setAccessible(true);
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return (Thread.Builder.OfVirtual) ctor.newInstance(scheduler);
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} catch (InvocationTargetException e) {
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Throwable cause = e.getCause();
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if (cause instanceof RuntimeException re) {
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throw re;
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}
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throw new RuntimeException(e);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* Return true if custom schedulers are supported.
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*/
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private static boolean supportsCustomScheduler() {
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try (var pool = Executors.newCachedThreadPool()) {
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try {
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virtualThreadBuilder(pool);
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return true;
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} catch (UnsupportedOperationException e) {
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return false;
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}
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}
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}
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}
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