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/*
* Copyright (c) 2019, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @summary Test virtual threads using Object.wait/notifyAll
* @modules java.base/java.lang:+open
* @library /test/lib
* @run junit MonitorWaitNotify
*/
import java.util.concurrent.Semaphore;
import jdk.test.lib.thread.VThreadRunner;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
class MonitorWaitNotify {
/**
* Test virtual thread waits, notified by platform thread.
*/
@Test
void testWaitNotify1() throws Exception {
var lock = new Object();
var ready = new Semaphore(0);
var thread = Thread.ofVirtual().start(() -> {
synchronized (lock) {
ready.release();
try {
lock.wait();
} catch (InterruptedException e) { }
}
});
// thread invokes notify
ready.acquire();
synchronized (lock) {
lock.notifyAll();
}
thread.join();
}
/**
* Test platform thread waits, notified by virtual thread.
*/
@Test
void testWaitNotify2() throws Exception {
var lock = new Object();
var ready = new Semaphore(0);
var thread = Thread.ofVirtual().start(() -> {
ready.acquireUninterruptibly();
synchronized (lock) {
lock.notifyAll();
}
});
synchronized (lock) {
ready.release();
lock.wait();
}
thread.join();
}
/**
* Test virtual thread waits, notified by another virtual thread.
*/
@Test
void testWaitNotify3() throws Exception {
// need at least two carrier threads due to pinning
int previousParallelism = VThreadRunner.ensureParallelism(2);
try {
var lock = new Object();
var ready = new Semaphore(0);
var thread1 = Thread.ofVirtual().start(() -> {
synchronized (lock) {
ready.release();
try {
lock.wait();
} catch (InterruptedException e) { }
}
});
var thread2 = Thread.ofVirtual().start(() -> {
ready.acquireUninterruptibly();
synchronized (lock) {
lock.notifyAll();
}
});
thread1.join();
thread2.join();
} finally {
// restore
VThreadRunner.setParallelism(previousParallelism);
}
}
/**
* Test interrupt status set when calling Object.wait.
*/
@Test
void testWaitNotify4() throws Exception {
VThreadRunner.run(() -> {
Thread t = Thread.currentThread();
t.interrupt();
Object lock = new Object();
synchronized (lock) {
try {
lock.wait();
fail();
} catch (InterruptedException e) {
// interrupt status should be cleared
assertFalse(t.isInterrupted());
}
}
});
}
/**
* Test interrupt when blocked in Object.wait.
*/
@Test
void testWaitNotify5() throws Exception {
VThreadRunner.run(() -> {
Thread t = Thread.currentThread();
scheduleInterrupt(t, 1000);
Object lock = new Object();
synchronized (lock) {
try {
lock.wait();
fail();
} catch (InterruptedException e) {
// interrupt status should be cleared
assertFalse(t.isInterrupted());
}
}
});
}
/**
* Schedule a thread to be interrupted after a delay.
*/
private static void scheduleInterrupt(Thread thread, long delay) {
Runnable interruptTask = () -> {
try {
Thread.sleep(delay);
thread.interrupt();
} catch (Exception e) {
e.printStackTrace();
}
};
new Thread(interruptTask).start();
}
}
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