564 lines
18 KiB
Java
564 lines
18 KiB
Java
/*
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* Copyright (c) 2019, 2024, 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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* @summary Test virtual threads using Object.wait/notifyAll
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* @modules java.base/java.lang:+open jdk.management
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* @library /test/lib
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* @run junit/othervm --enable-native-access=ALL-UNNAMED MonitorWaitNotify
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*/
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.ThreadFactory;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicInteger;
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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.IntStream;
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import java.util.stream.Stream;
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import java.util.stream.Collectors;
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import jdk.test.lib.thread.VThreadScheduler;
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import jdk.test.lib.thread.VThreadRunner; // ensureParallelism requires jdk.management
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import jdk.test.lib.thread.VThreadPinner;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.BeforeAll;
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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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class MonitorWaitNotify {
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@BeforeAll
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static void setup() {
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// need >=2 carriers for testing pinning
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VThreadRunner.ensureParallelism(2);
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}
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/**
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* Test virtual thread waits, notified by platform thread.
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*/
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@ParameterizedTest
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@ValueSource(booleans = { true, false })
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void testWaitNotify1(boolean pinned) throws Exception {
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var lock = new Object();
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var ready = new AtomicBoolean();
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var thread = Thread.ofVirtual().start(() -> {
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synchronized (lock) {
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try {
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if (pinned) {
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VThreadPinner.runPinned(() -> {
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ready.set(true);
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lock.wait();
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});
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} else {
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ready.set(true);
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lock.wait();
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}
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} catch (InterruptedException e) { }
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}
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});
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awaitTrue(ready);
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// notify, thread should block waiting to reenter
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synchronized (lock) {
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lock.notifyAll();
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await(thread, Thread.State.BLOCKED);
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}
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thread.join();
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}
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/**
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* Test platform thread waits, notified by virtual thread.
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*/
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@Test
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void testWaitNotify2() throws Exception {
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var lock = new Object();
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var thread = Thread.ofVirtual().unstarted(() -> {
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synchronized (lock) {
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lock.notifyAll();
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}
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});
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synchronized (lock) {
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thread.start();
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lock.wait();
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}
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thread.join();
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}
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/**
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* Test virtual thread waits, notified by another virtual thread.
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*/
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@ParameterizedTest
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@ValueSource(booleans = { true, false })
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void testWaitNotify3(boolean pinned) throws Exception {
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var lock = new Object();
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var ready = new AtomicBoolean();
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var thread1 = Thread.ofVirtual().start(() -> {
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synchronized (lock) {
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try {
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if (pinned) {
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VThreadPinner.runPinned(() -> {
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ready.set(true);
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lock.wait();
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});
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} else {
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ready.set(true);
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lock.wait();
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}
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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});
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var thread2 = Thread.ofVirtual().start(() -> {
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try {
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awaitTrue(ready);
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// notify, thread should block waiting to reenter
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synchronized (lock) {
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lock.notifyAll();
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await(thread1, Thread.State.BLOCKED);
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}
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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});
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thread1.join();
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thread2.join();
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}
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/**
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* Test notifyAll when there are no threads waiting.
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*/
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@ParameterizedTest
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@ValueSource(ints = { 0, 30000, Integer.MAX_VALUE })
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void testNotifyBeforeWait(int timeout) throws Exception {
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var lock = new Object();
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// no threads waiting
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synchronized (lock) {
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lock.notifyAll();
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}
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var ready = new AtomicBoolean();
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var thread = Thread.ofVirtual().start(() -> {
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try {
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synchronized (lock) {
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ready.set(true);
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// thread should wait
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if (timeout > 0) {
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lock.wait(timeout);
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} else {
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lock.wait();
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}
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}
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} catch (InterruptedException e) { }
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});
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try {
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// wait for thread to start and wait
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awaitTrue(ready);
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Thread.State expectedState = timeout > 0
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? Thread.State.TIMED_WAITING
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: Thread.State.WAITING;
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await(thread, expectedState);
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// poll thread state again, it should still be waiting
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Thread.sleep(10);
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assertEquals(thread.getState(), expectedState);
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} finally {
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synchronized (lock) {
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lock.notifyAll();
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}
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thread.join();
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}
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}
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/**
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* Test duration of timed Object.wait.
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*/
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@Test
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void testTimedWaitDuration1() throws Exception {
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var lock = new Object();
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var durationRef = new AtomicReference<Long>();
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var thread = Thread.ofVirtual().start(() -> {
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try {
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synchronized (lock) {
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long start = millisTime();
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lock.wait(2000);
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durationRef.set(millisTime() - start);
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}
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} catch (InterruptedException e) { }
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});
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thread.join();
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long duration = durationRef.get();
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checkDuration(duration, 1900, 20_000);
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}
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/**
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* Test duration of timed Object.wait. This test invokes wait twice, first with a short
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* timeout, the second with a longer timeout. The test scenario ensures that the
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* timeout from the first wait doesn't interfere with the second wait.
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*/
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@Test
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void testTimedWaitDuration2() throws Exception {
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var lock = new Object();
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var ready = new AtomicBoolean();
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var waited = new AtomicBoolean();
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var durationRef = new AtomicReference<Long>();
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var thread = Thread.ofVirtual().start(() -> {
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try {
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synchronized (lock) {
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ready.set(true);
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lock.wait(200);
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waited.set(true);
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long start = millisTime();
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lock.wait(2000);
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durationRef.set(millisTime() - start);
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}
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} catch (InterruptedException e) { }
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});
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awaitTrue(ready);
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synchronized (lock) {
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// wake thread if waiting in first wait
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if (!waited.get()) {
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lock.notifyAll();
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}
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}
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thread.join();
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long duration = durationRef.get();
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checkDuration(duration, 1900, 20_000);
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}
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/**
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* Testing invoking Object.wait with interrupt status set.
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*/
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@ParameterizedTest
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@ValueSource(ints = { 0, 30000, Integer.MAX_VALUE })
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void testWaitWithInterruptSet(int timeout) throws Exception {
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VThreadRunner.run(() -> {
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Object lock = new Object();
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synchronized (lock) {
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Thread.currentThread().interrupt();
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if (timeout > 0) {
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assertThrows(InterruptedException.class, () -> lock.wait(timeout));
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} else {
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assertThrows(InterruptedException.class, lock::wait);
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}
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assertFalse(Thread.currentThread().isInterrupted());
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}
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});
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}
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/**
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* Test interrupting a virtual thread waiting in Object.wait.
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*/
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@ParameterizedTest
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@ValueSource(ints = { 0, 30000, Integer.MAX_VALUE })
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void testInterruptWait(int timeout) throws Exception {
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var lock = new Object();
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var ready = new AtomicBoolean();
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var interruptedException = new AtomicBoolean();
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var vthread = Thread.ofVirtual().start(() -> {
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synchronized (lock) {
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try {
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ready.set(true);
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if (timeout > 0) {
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lock.wait(timeout);
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} else {
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lock.wait();
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}
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} catch (InterruptedException e) {
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// check stack trace has the expected frames
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Set<String> expected = Set.of("wait0", "wait", "run");
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Set<String> methods = Stream.of(e.getStackTrace())
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.map(StackTraceElement::getMethodName)
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.collect(Collectors.toSet());
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assertTrue(methods.containsAll(expected));
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interruptedException.set(true);
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}
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}
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});
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// wait for thread to start and wait
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awaitTrue(ready);
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await(vthread, timeout > 0 ? Thread.State.TIMED_WAITING : Thread.State.WAITING);
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// interrupt thread, should block, then throw InterruptedException
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synchronized (lock) {
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vthread.interrupt();
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await(vthread, Thread.State.BLOCKED);
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}
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vthread.join();
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assertTrue(interruptedException.get());
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}
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/**
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* Test interrupting a virtual thread blocked waiting to reenter after waiting.
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*/
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@ParameterizedTest
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@ValueSource(ints = { 0, 30000, Integer.MAX_VALUE })
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void testInterruptReenterAfterWait(int timeout) throws Exception {
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var lock = new Object();
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var ready = new AtomicBoolean();
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var interruptedException = new AtomicBoolean();
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var vthread = Thread.ofVirtual().start(() -> {
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synchronized (lock) {
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try {
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ready.set(true);
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if (timeout > 0) {
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lock.wait(timeout);
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} else {
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lock.wait();
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}
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} catch (InterruptedException e) {
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interruptedException.set(true);
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}
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}
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});
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// wait for thread to start and wait
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awaitTrue(ready);
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await(vthread, timeout > 0 ? Thread.State.TIMED_WAITING : Thread.State.WAITING);
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// notify, thread should block waiting to reenter
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synchronized (lock) {
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lock.notifyAll();
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await(vthread, Thread.State.BLOCKED);
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// interrupt when blocked
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vthread.interrupt();
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}
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vthread.join();
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assertFalse(interruptedException.get());
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assertTrue(vthread.isInterrupted());
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}
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/**
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* Test Object.wait when the monitor entry count > 1.
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*/
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@ParameterizedTest
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@ValueSource(ints = { 0, 30000, Integer.MAX_VALUE })
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void testWaitWhenEnteredManyTimes(int timeout) throws Exception {
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var lock = new Object();
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var ready = new AtomicBoolean();
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var vthread = Thread.ofVirtual().start(() -> {
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synchronized (lock) {
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synchronized (lock) {
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synchronized (lock) {
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try {
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ready.set(true);
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if (timeout > 0) {
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lock.wait(timeout);
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} else {
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lock.wait();
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}
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} catch (InterruptedException e) { }
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}
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}
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}
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});
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// wait for thread to start and wait
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awaitTrue(ready);
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await(vthread, timeout > 0 ? Thread.State.TIMED_WAITING : Thread.State.WAITING);
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// notify, thread should block waiting to reenter
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synchronized (lock) {
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lock.notifyAll();
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await(vthread, Thread.State.BLOCKED);
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}
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vthread.join();
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}
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/**
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* Test that Object.wait does not consume the thread's parking permit.
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*/
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@Test
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void testParkingPermitNotConsumed() throws Exception {
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var lock = new Object();
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var started = new CountDownLatch(1);
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var completed = new AtomicBoolean();
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var vthread = Thread.ofVirtual().start(() -> {
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started.countDown();
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LockSupport.unpark(Thread.currentThread());
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synchronized (lock) {
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try {
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lock.wait();
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} catch (InterruptedException e) {
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fail("wait interrupted");
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}
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}
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LockSupport.park(); // should not park
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completed.set(true);
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});
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// wait for thread to start and wait
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started.await();
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await(vthread, Thread.State.WAITING);
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// wakeup thread
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synchronized (lock) {
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lock.notifyAll();
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}
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// thread should terminate
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vthread.join();
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assertTrue(completed.get());
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}
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/**
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* Test that Object.wait does not make available the thread's parking permit.
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*/
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@Test
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void testParkingPermitNotOffered() throws Exception {
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var lock = new Object();
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var started = new CountDownLatch(1);
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var readyToPark = new CountDownLatch(1);
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var completed = new AtomicBoolean();
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var vthread = Thread.ofVirtual().start(() -> {
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started.countDown();
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synchronized (lock) {
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try {
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lock.wait();
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} catch (InterruptedException e) {
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fail("wait interrupted");
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}
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}
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readyToPark.countDown();
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LockSupport.park(); // should park
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completed.set(true);
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});
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// wait for thread to start and wait
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started.await();
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await(vthread, Thread.State.WAITING);
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// wakeup thread
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synchronized (lock) {
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lock.notifyAll();
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}
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// thread should park
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readyToPark.await();
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await(vthread, Thread.State.WAITING);
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LockSupport.unpark(vthread);
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// thread should terminate
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vthread.join();
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assertTrue(completed.get());
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}
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/**
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* Test that wait(long) throws IAE when timeout is negative.
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*/
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@Test
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void testIllegalArgumentException() throws Exception {
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VThreadRunner.run(() -> {
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Object obj = new Object();
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synchronized (obj) {
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assertThrows(IllegalArgumentException.class, () -> obj.wait(-1L));
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assertThrows(IllegalArgumentException.class, () -> obj.wait(-1000L));
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assertThrows(IllegalArgumentException.class, () -> obj.wait(Long.MIN_VALUE));
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}
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});
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}
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/**
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* Test that wait throws IMSE when not owner.
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*/
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@Test
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void testIllegalMonitorStateException() throws Exception {
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VThreadRunner.run(() -> {
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Object obj = new Object();
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assertThrows(IllegalMonitorStateException.class, () -> obj.wait());
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assertThrows(IllegalMonitorStateException.class, () -> obj.wait(0));
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assertThrows(IllegalMonitorStateException.class, () -> obj.wait(1000));
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assertThrows(IllegalMonitorStateException.class, () -> obj.wait(Long.MAX_VALUE));
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});
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}
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/**
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* Waits for the boolean value to become true.
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*/
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private static void awaitTrue(AtomicBoolean ref) throws InterruptedException {
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while (!ref.get()) {
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Thread.sleep(20);
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}
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}
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/**
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* Waits for the given thread to reach a given state.
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*/
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private void await(Thread thread, Thread.State expectedState) throws InterruptedException {
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Thread.State state = thread.getState();
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while (state != expectedState) {
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assertTrue(state != Thread.State.TERMINATED, "Thread has terminated");
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Thread.sleep(10);
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state = thread.getState();
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}
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}
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/**
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* Returns the current time in milliseconds.
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*/
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private static long millisTime() {
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long now = System.nanoTime();
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return TimeUnit.MILLISECONDS.convert(now, TimeUnit.NANOSECONDS);
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}
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/**
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* Check a duration is within expected bounds.
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* @param duration, in milliseconds
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* @param min minimum expected duration, in milliseconds
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* @param max maximum expected duration, in milliseconds
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* @return the duration (now - start), in milliseconds
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*/
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private static void checkDuration(long duration, long min, long max) {
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assertTrue(duration >= min,
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"Duration " + duration + "ms, expected >= " + min + "ms");
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assertTrue(duration <= max,
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"Duration " + duration + "ms, expected <= " + max + "ms");
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}
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}
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