361 lines
10 KiB
Java
361 lines
10 KiB
Java
/*
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* Copyright (c) 2019, 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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* @summary Test virtual threads using park/unpark
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* @library /test/lib
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* @run junit Parking
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*/
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import java.time.Duration;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.locks.LockSupport;
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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 static org.junit.jupiter.api.Assertions.*;
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class Parking {
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private static final Object lock = new Object();
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/**
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* Park, unparked by platform thread.
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*/
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@Test
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void testPark1() throws Exception {
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var thread = Thread.ofVirtual().start(LockSupport::park);
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Thread.sleep(1000); // give time for virtual thread to park
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LockSupport.unpark(thread);
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thread.join();
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}
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/**
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* Park, unparked by virtual thread.
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*/
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@Test
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void testPark2() throws Exception {
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var thread1 = Thread.ofVirtual().start(LockSupport::park);
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Thread.sleep(1000); // give time for virtual thread to park
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var thread2 = Thread.ofVirtual().start(() -> LockSupport.unpark(thread1));
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thread1.join();
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thread2.join();
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}
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/**
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* Park while holding monitor, unparked by platform thread.
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*/
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@Test
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void testPark3() throws Exception {
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var thread = Thread.ofVirtual().start(() -> {
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synchronized (lock) {
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LockSupport.park();
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}
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});
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Thread.sleep(1000); // give time for virtual thread to park
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LockSupport.unpark(thread);
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thread.join();
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}
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/**
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* Park with native frame on stack.
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*/
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@Test
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void testPark4() throws Exception {
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// not implemented
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}
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/**
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* Unpark before park.
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*/
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@Test
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void testPark5() throws Exception {
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var thread = Thread.ofVirtual().start(() -> {
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LockSupport.unpark(Thread.currentThread());
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LockSupport.park();
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});
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thread.join();
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}
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/**
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* 2 x unpark before park.
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*/
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@Test
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void testPark6() throws Exception {
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var thread = Thread.ofVirtual().start(() -> {
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Thread me = Thread.currentThread();
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LockSupport.unpark(me);
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LockSupport.unpark(me);
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LockSupport.park();
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LockSupport.park(); // should park
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});
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Thread.sleep(1000); // give time for thread to park
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LockSupport.unpark(thread);
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thread.join();
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}
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/**
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* 2 x park and unpark by platform thread.
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*/
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@Test
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void testPark7() throws Exception {
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var thread = Thread.ofVirtual().start(() -> {
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LockSupport.park();
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LockSupport.park();
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});
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Thread.sleep(1000); // give time for thread to park
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// unpark, virtual thread should park again
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LockSupport.unpark(thread);
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Thread.sleep(1000);
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assertTrue(thread.isAlive());
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// let it terminate
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LockSupport.unpark(thread);
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thread.join();
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}
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/**
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* Park with interrupt status set.
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*/
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@Test
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void testPark8() throws Exception {
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VThreadRunner.run(() -> {
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Thread t = Thread.currentThread();
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t.interrupt();
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LockSupport.park();
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assertTrue(t.isInterrupted());
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});
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}
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/**
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* Thread interrupt when parked.
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*/
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@Test
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void testPark9() throws Exception {
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VThreadRunner.run(() -> {
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Thread t = Thread.currentThread();
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scheduleInterrupt(t, 1000);
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while (!Thread.currentThread().isInterrupted()) {
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LockSupport.park();
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}
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});
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}
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/**
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* Park while holding monitor and with interrupt status set.
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*/
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@Test
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void testPark10() throws Exception {
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VThreadRunner.run(() -> {
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Thread t = Thread.currentThread();
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t.interrupt();
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synchronized (lock) {
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LockSupport.park();
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}
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assertTrue(t.isInterrupted());
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});
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}
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/**
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* Thread interrupt when parked while holding monitor
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*/
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@Test
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void testPark11() throws Exception {
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VThreadRunner.run(() -> {
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Thread t = Thread.currentThread();
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scheduleInterrupt(t, 1000);
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while (!Thread.currentThread().isInterrupted()) {
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synchronized (lock) {
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LockSupport.park();
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}
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}
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});
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}
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/**
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* parkNanos(-1) completes immediately
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*/
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@Test
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void testParkNanos1() throws Exception {
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VThreadRunner.run(() -> LockSupport.parkNanos(-1));
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}
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/**
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* parkNanos(0) completes immediately
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*/
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@Test
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void testParkNanos2() throws Exception {
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VThreadRunner.run(() -> LockSupport.parkNanos(0));
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}
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/**
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* parkNanos(1000ms) parks thread.
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*/
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@Test
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void testParkNanos3() throws Exception {
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VThreadRunner.run(() -> {
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// park for 1000ms
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long nanos = TimeUnit.NANOSECONDS.convert(1000, TimeUnit.MILLISECONDS);
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long start = System.nanoTime();
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LockSupport.parkNanos(nanos);
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// check that virtual thread parked for >= 900ms
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long elapsed = TimeUnit.MILLISECONDS.convert(System.nanoTime() - start,
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TimeUnit.NANOSECONDS);
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assertTrue(elapsed >= 900);
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});
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}
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/**
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* Park with parkNanos, unparked by platform thread.
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*/
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@Test
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void testParkNanos4() throws Exception {
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var thread = Thread.ofVirtual().start(() -> {
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long nanos = TimeUnit.NANOSECONDS.convert(1, TimeUnit.DAYS);
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LockSupport.parkNanos(nanos);
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});
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Thread.sleep(100); // give time for virtual thread to park
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LockSupport.unpark(thread);
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thread.join();
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}
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/**
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* Park with parkNanos, unparked by virtual thread.
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*/
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@Test
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void testParkNanos5() throws Exception {
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var thread1 = Thread.ofVirtual().start(() -> {
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long nanos = TimeUnit.NANOSECONDS.convert(1, TimeUnit.DAYS);
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LockSupport.parkNanos(nanos);
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});
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Thread.sleep(100); // give time for virtual thread to park
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var thread2 = Thread.ofVirtual().start(() -> LockSupport.unpark(thread1));
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thread1.join();
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thread2.join();
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}
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/**
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* Unpark before parkNanos.
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*/
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@Test
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void testParkNanos6() throws Exception {
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VThreadRunner.run(() -> {
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LockSupport.unpark(Thread.currentThread());
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long nanos = TimeUnit.NANOSECONDS.convert(1, TimeUnit.DAYS);
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LockSupport.parkNanos(nanos);
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});
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}
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/**
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* Unpark before parkNanos(0), should consume parking permit.
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*/
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@Test
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void testParkNanos7() throws Exception {
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var thread = Thread.ofVirtual().start(() -> {
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LockSupport.unpark(Thread.currentThread());
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LockSupport.parkNanos(0); // should consume parking permit
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LockSupport.park(); // should block
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});
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boolean isAlive = thread.join(Duration.ofSeconds(2));
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assertTrue(isAlive);
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LockSupport.unpark(thread);
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thread.join();
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}
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/**
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* Park with parkNanos and interrupt status set.
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*/
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@Test
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void testParkNanos8() throws Exception {
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VThreadRunner.run(() -> {
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Thread t = Thread.currentThread();
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t.interrupt();
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LockSupport.parkNanos(Duration.ofDays(1).toNanos());
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assertTrue(t.isInterrupted());
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});
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}
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/**
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* Thread interrupt when parked in parkNanos.
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*/
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@Test
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void testParkNanos9() throws Exception {
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VThreadRunner.run(() -> {
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Thread t = Thread.currentThread();
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scheduleInterrupt(t, 1000);
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while (!Thread.currentThread().isInterrupted()) {
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LockSupport.parkNanos(Duration.ofDays(1).toNanos());
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}
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});
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}
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/**
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* Park with parkNanos while holding monitor and with interrupt status set.
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*/
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@Test
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void testParkNanos10() throws Exception {
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VThreadRunner.run(() -> {
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Thread t = Thread.currentThread();
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t.interrupt();
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synchronized (lock) {
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LockSupport.parkNanos(Duration.ofDays(1).toNanos());
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}
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assertTrue(t.isInterrupted());
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});
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}
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/**
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* Thread interrupt when parked in parkNanos and while holding monitor.
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*/
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@Test
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void testParkNanos11() throws Exception {
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VThreadRunner.run(() -> {
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Thread t = Thread.currentThread();
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scheduleInterrupt(t, 1000);
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while (!Thread.currentThread().isInterrupted()) {
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synchronized (lock) {
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LockSupport.parkNanos(Duration.ofDays(1).toNanos());
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}
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}
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});
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}
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/**
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* Schedule a thread to be interrupted after a delay.
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*/
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private static void scheduleInterrupt(Thread thread, long delay) {
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Runnable interruptTask = () -> {
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try {
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Thread.sleep(delay);
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thread.interrupt();
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} catch (Exception e) {
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e.printStackTrace();
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}
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};
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new Thread(interruptTask).start();
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}
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}
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