124 lines
4.3 KiB
Java
124 lines
4.3 KiB
Java
/*
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* Copyright (c) 2020, 2023, 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 asynchronous Thread.getStackTrace
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* @requires vm.debug != true & vm.continuations
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* @modules java.base/java.lang:+open
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* @compile GetStackTraceALot.java ../ThreadBuilders.java
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* @run main GetStackTraceALot
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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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* @compile GetStackTraceALot.java ../ThreadBuilders.java
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* @run main/timeout=300 GetStackTraceALot 1000
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*/
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import java.time.Duration;
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import java.util.concurrent.Executor;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.ThreadFactory;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.locks.LockSupport;
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public class GetStackTraceALot {
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static class RoundRobinExecutor implements Executor, AutoCloseable {
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private final ExecutorService[] executors;
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private int next;
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RoundRobinExecutor() {
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var factory = Thread.ofPlatform().name("worker-", 1).daemon(true).factory();
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var executors = new ExecutorService[2];
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for (int i = 0; i < executors.length; i++) {
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executors[i] = Executors.newSingleThreadExecutor(factory);
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}
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this.executors = executors;
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}
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@Override
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public void execute(Runnable task) {
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executors[next].execute(task);
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next = (next + 1) % executors.length;
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}
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@Override
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public void close() {
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for (int i = 0; i < executors.length; i++) {
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executors[i].shutdown();
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}
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}
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}
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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]) : 10_000;
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final int ITERATIONS = iterations;
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final int SPIN_NANOS = 5000;
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AtomicInteger count = new AtomicInteger();
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try (RoundRobinExecutor executor = new RoundRobinExecutor()) {
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Thread thread = ThreadBuilders.virtualThreadBuilder(executor).start(() -> {
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while (count.incrementAndGet() < ITERATIONS) {
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long start = System.nanoTime();
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while ((System.nanoTime() - start) < SPIN_NANOS) {
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Thread.onSpinWait();
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}
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LockSupport.parkNanos(500_000);
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}
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});
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long start = System.nanoTime();
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while (thread.isAlive()) {
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StackTraceElement[] stackTrace = thread.getStackTrace();
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// printStackTrace(stackTrace);
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Thread.sleep(5);
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if ((System.nanoTime() - start) > 500_000_000) {
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System.out.println(count.get());
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start = System.nanoTime();
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}
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}
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int countValue = count.get();
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if (countValue != ITERATIONS) {
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throw new RuntimeException("count = " + countValue);
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}
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}
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}
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static void printStackTrace(StackTraceElement[] stackTrace) {
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if (stackTrace == null) {
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System.out.println("NULL");
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} else {
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for (var e : stackTrace) {
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System.out.println("\t" + e);
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}
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}
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}
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}
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