126 lines
4.4 KiB
Java
126 lines
4.4 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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* @bug 8322818
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* @summary Stress test Thread.getStackTrace on a virtual thread that is pinned
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* @requires vm.debug != true
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* @modules jdk.management
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* @library /test/lib
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* @run main/othervm --enable-native-access=ALL-UNNAMED GetStackTraceALotWhenPinned 500000
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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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* @modules jdk.management
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* @library /test/lib
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* @run main/othervm/timeout=300 --enable-native-access=ALL-UNNAMED GetStackTraceALotWhenPinned 200000
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*/
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import java.time.Instant;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.locks.LockSupport;
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import jdk.test.lib.thread.VThreadRunner; // ensureParallelism requires jdk.management
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import jdk.test.lib.thread.VThreadPinner;
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public class GetStackTraceALotWhenPinned {
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public static void main(String[] args) throws Exception {
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// need at least two carrier threads when main thread is a virtual thread
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if (Thread.currentThread().isVirtual()) {
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VThreadRunner.ensureParallelism(2);
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}
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int iterations = Integer.parseInt(args[0]);
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var barrier = new Barrier(2);
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// Start a virtual thread that loops doing Thread.yield and parking while pinned.
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// This loop creates the conditions for the main thread to sample the stack trace
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// as it transitions from being unmounted to parking while pinned.
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var thread = Thread.startVirtualThread(() -> {
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boolean timed = false;
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for (int i = 0; i < iterations; i++) {
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// wait for main thread to arrive
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barrier.await();
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Thread.yield();
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boolean b = timed;
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VThreadPinner.runPinned(() -> {
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if (b) {
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LockSupport.parkNanos(Long.MAX_VALUE);
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} else {
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LockSupport.park();
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}
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});
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timed = !timed;
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}
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});
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long lastTimestamp = System.currentTimeMillis();
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for (int i = 1; i <= iterations; i++) {
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// wait for virtual thread to arrive
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barrier.await();
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thread.getStackTrace();
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LockSupport.unpark(thread);
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long currentTime = System.currentTimeMillis();
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if (i == iterations || ((currentTime - lastTimestamp) > 500)) {
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System.out.format("%s => %d of %d%n", Instant.now(), i, iterations);
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lastTimestamp = currentTime;
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}
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}
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}
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/**
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* Alow threads wait for each other to reach a common barrier point. This class does
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* not park threads that are waiting for the barrier to trip, instead it spins. This
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* makes it suitable for tests that use LockSupport.park or Thread.yield.
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*/
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private static class Barrier {
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private final int parties;
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private final AtomicInteger count;
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private volatile int generation;
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Barrier(int parties) {
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this.parties = parties;
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this.count = new AtomicInteger(parties);
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}
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void await() {
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int g = generation;
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if (count.decrementAndGet() == 0) {
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count.set(parties);
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generation = g + 1;
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} else {
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while (generation == g) {
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Thread.onSpinWait();
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}
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}
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}
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}
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}
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