130 lines
4.8 KiB
Java
130 lines
4.8 KiB
Java
/*
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* Copyright (c) 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=timeout
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* @summary Stress test timed-Object.wait
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* @run main/othervm TimedWaitALot 200
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*/
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/*
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* @test id=timeout-notify
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* @summary Test timed-Object.wait where the waiting thread is awakened with Object.notify
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* at around the same time that the timeout expires.
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* @run main/othervm TimedWaitALot 200 true false
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*/
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/*
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* @test id=timeout-interrupt
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* @summary Test timed-Object.wait where the waiting thread is awakened with Thread.interrupt
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* at around the same time that the timeout expires.
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* @run main/othervm TimedWaitALot 200 false true
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*/
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/*
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* @test id=timeout-notify-interrupt
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* @summary Test timed-Object.wait where the waiting thread is awakened with Object.notify
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* and Thread.interrupt at around the same time that the timeout expires.
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* @run main/othervm TimedWaitALot 100 true true
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*/
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import java.time.Instant;
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import java.util.concurrent.Executors;
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import java.util.concurrent.SynchronousQueue;
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import java.util.concurrent.ThreadLocalRandom;
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public class TimedWaitALot {
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public static void main(String[] args) throws Exception {
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int iterations = Integer.parseInt(args[0]);
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boolean notify = args.length >= 2 && "true".equals(args[1]);
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boolean interrupt = args.length >=3 && "true".equals(args[2]);
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// test all timeouts concurrently
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int[] timeouts = { 10, 20, 50, 100 };
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for (int i = 1; i <= iterations; i++) {
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System.out.println(Instant.now() + " => " + i + " of " + iterations);
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test(notify, interrupt, timeouts);
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}
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}
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/**
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* Start a first virtual thread to wait in Object.wait(millis).
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* If {@code notify} is true, start a virtual thread to use Object.notifyAll at around
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* the same time that the timeout expires.
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* If {@code interrupt} is true, start virtual thread to interrupts the first virtual
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* thread at around the same time as the timeout expires.
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*/
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static void test(boolean notify, boolean interrupt, int... timeouts) throws Exception {
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try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
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for (int timeout : timeouts) {
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var queue = new SynchronousQueue<Thread>();
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var lock = new Object();
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// virtual thread waits with Object.wait(timeout)
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executor.submit(() -> {
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queue.put(Thread.currentThread());
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synchronized (lock) {
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lock.wait(timeout);
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}
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return null;
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});
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// wait for thread to start
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Thread thread = queue.take();
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// start thread to Object.notifyAll at around time that the timeout expires
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if (notify) {
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if (ThreadLocalRandom.current().nextBoolean()) {
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synchronized (lock) {
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sleepLessThan(timeout);
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lock.notifyAll();
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}
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} else {
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sleepLessThan(timeout);
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synchronized (lock) {
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lock.notifyAll();
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}
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}
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}
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// start thread to interrupt first thread at around time that the timeout expires
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if (interrupt) {
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executor.submit(() -> {
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sleepLessThan(timeout);
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thread.interrupt();
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return null;
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});
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}
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}
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}
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}
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/**
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* Sleeps for just less than the given timeout, in millis.
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*/
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private static void sleepLessThan(long timeout) throws InterruptedException {
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int delta = ThreadLocalRandom.current().nextInt(10);
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Thread.sleep(timeout - delta);
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}
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}
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