76 lines
2.7 KiB
Java
76 lines
2.7 KiB
Java
/*
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* Copyright (c) 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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* @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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* @run main GetStackTraceALotWhenPinned 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/timeout=300 GetStackTraceALotWhenPinned 10000
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*/
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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 GetStackTraceALotWhenPinned {
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public static void main(String[] args) throws Exception {
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var counter = new AtomicInteger(Integer.parseInt(args[0]));
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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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while (counter.decrementAndGet() > 0) {
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Thread.yield();
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synchronized (GetStackTraceALotWhenPinned.class) {
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if (timed) {
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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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while (thread.isAlive()) {
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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 ((currentTime - lastTimestamp) > 500) {
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System.out.println(counter.get() + " remaining ...");
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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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