92 lines
3.3 KiB
Java
92 lines
3.3 KiB
Java
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/*
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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
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* @summary Stress test Thread.getStackTrace on a virtual thread in timed-Object.wait
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* @requires vm.debug != true
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* @run main/othervm GetStackTraceALotWithTimedWait 100000
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*/
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/*
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* @test
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* @requires vm.debug == true
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* @run main/othervm GetStackTraceALotWithTimedWait 50000
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*/
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import java.time.Instant;
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import java.util.ArrayList;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicReference;
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public class GetStackTraceALotWithTimedWait {
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public static void main(String[] args) throws Exception {
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int iterations = args.length > 0 ? Integer.parseInt(args[0]) : 100_000;
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try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
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var done = new AtomicBoolean();
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var threads = new ArrayList<Thread>();
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// start threads that invoke Object.wait with a short timeout
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int nthreads = Runtime.getRuntime().availableProcessors();
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for (int i = 0; i < nthreads; i++) {
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var ref = new AtomicReference<Thread>();
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var lock = new Object();
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executor.submit(() -> {
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ref.set(Thread.currentThread());
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while (!done.get()) {
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synchronized (lock) {
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int delay = 1 + ThreadLocalRandom.current().nextInt(20);
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lock.wait(delay);
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}
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}
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return null;
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});
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Thread thread;
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while ((thread = ref.get()) == null) {
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Thread.sleep(20);
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}
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threads.add(thread);
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}
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// hammer on Thread.getStackTrace
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try {
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for (int i = 1; i <= iterations; i++) {
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if ((i % 1000) == 0) {
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System.out.println(Instant.now() + " => " + i + " of " + iterations);
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}
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for (Thread thread : threads) {
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thread.getStackTrace();
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}
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}
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} finally {
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done.set(true);
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}
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}
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}
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}
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