97 lines
3.1 KiB
Java
97 lines
3.1 KiB
Java
/*
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* Copyright (c) 2023, 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 virtual threads that are blocking or
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* blocked on monitorenter
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* @requires vm.debug != true
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* @modules java.base/java.lang:+open
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* @library /test/lib
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* @run main/othervm GetStackTraceALotWhenBlocking 500000
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*/
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/*
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* @test
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* @requires vm.debug == true & vm.continuations
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* @modules java.base/java.lang:+open
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* @library /test/lib
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* @run main/othervm/timeout=300 GetStackTraceALotWhenBlocking 50000
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*/
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import java.time.Instant;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.atomic.AtomicBoolean;
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import jdk.test.lib.thread.VThreadRunner;
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public class GetStackTraceALotWhenBlocking {
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public static void main(String[] args) throws Exception {
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// need at least two carriers
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VThreadRunner.ensureParallelism(2);
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int iterations = args.length > 0 ? Integer.parseInt(args[0]) : 100_000;
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var done = new AtomicBoolean();
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var lock = new Object();
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Runnable task = () -> {
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long count = 0L;
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while (!done.get()) {
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synchronized (lock) {
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pause();
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}
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count++;
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}
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System.out.format("%s %s => %d loops%n", Instant.now(), Thread.currentThread(), count);
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};
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var thread1 = Thread.ofVirtual().start(task);
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var thread2 = Thread.ofVirtual().start(task);
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try {
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for (int i = 1; i <= iterations; i++) {
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if ((i % 10_000) == 0) {
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System.out.format("%s => %d of %d%n", Instant.now(), i, iterations);
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}
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thread1.getStackTrace();
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pause();
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thread2.getStackTrace();
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pause();
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}
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} finally {
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done.set(true);
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thread1.join();
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thread2.join();
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}
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}
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private static void pause() {
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if (ThreadLocalRandom.current().nextBoolean()) {
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Thread.onSpinWait();
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} else {
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Thread.yield();
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}
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}
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}
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