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/*
* Copyright (c) 2020, 2024, 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 id=sq
* @summary Stress test virtual threads with a SynchronousQueue
* @requires vm.debug != true
* @run main PingPong SQ 500000
*/
/*
* @test id=ltq
* @summary Stress test virtual threads with a LinkedTransferQueue
* @requires vm.debug != true
* @run main PingPong LTQ 500000
*/
import java.time.Duration;
import java.time.Instant;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.LinkedTransferQueue;
import java.util.concurrent.atomic.AtomicInteger;
public class PingPong {
public static void main(String[] args) throws Exception {
Exchanger<String> queue;
int iterations;
if (args.length == 0) {
queue = new LTQExchanger<>();
iterations = 10_000_000;
} else {
if (args[0].equals("SQ")) {
queue = new SQExchanger<>();
} else {
queue = new LTQExchanger<>();
}
iterations = Integer.parseInt(args[1]);
}
AtomicInteger count1 = new AtomicInteger();
AtomicInteger count2 = new AtomicInteger();
Thread t1 = Thread.ofVirtual().start(() -> {
try {
while (count1.incrementAndGet() < iterations) {
queue.transfer("hello");
String reply = queue.take();
if (!"ack".equals(reply)) {
throw new RuntimeException("reply=" + reply);
}
}
} catch (Exception e) {
e.printStackTrace();
}
});
Thread t2 = Thread.ofVirtual().start(() -> {
try {
while (count2.incrementAndGet() < iterations) {
String message = queue.take();
if (!"hello".equals(message)) {
throw new RuntimeException("message=" + message);
}
queue.transfer("ack");
}
} catch (Exception e) {
e.printStackTrace();
}
});
boolean terminated;
do {
terminated = t1.join(Duration.ofMillis(500));
if (terminated) {
terminated = t2.join(Duration.ofMillis(500));
}
System.out.format("%s => T1 %d of %d, T2 %d of %d%n",
Instant.now(), count1.get(), iterations, count2.get(), iterations);
} while (!terminated);
}
interface Exchanger<E> {
void transfer (E value) throws InterruptedException;
E take() throws InterruptedException;
}
static class SQExchanger<E> implements Exchanger<E> {
private final SynchronousQueue<E> queue = new SynchronousQueue<>();
@Override
public void transfer(E value) throws InterruptedException {
queue.put(value);
}
@Override
public E take() throws InterruptedException {
return queue.take();
}
}
static class LTQExchanger<E> implements Exchanger<E> {
private final LinkedTransferQueue<E> queue = new LinkedTransferQueue<>();
@Override
public void transfer(E value) throws InterruptedException {
queue.transfer(value);
}
@Override
public E take() throws InterruptedException {
return queue.take();
}
}
}
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