83 lines
3.1 KiB
Java
83 lines
3.1 KiB
Java
/*
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* Copyright (c) 2021, 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 Test Thread::getStackTrace on a virtual thread that is runnable-unmounted
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* @requires vm.continuations
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* @run main/othervm -Djdk.virtualThreadScheduler.maxPoolSize=1 GetStackTraceWhenRunnable
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*/
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import java.io.IOException;
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import java.nio.channels.ClosedSelectorException;
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import java.nio.channels.Selector;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.locks.LockSupport;
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public class GetStackTraceWhenRunnable {
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public static void main(String[] args) throws Exception {
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try (Selector sel = Selector.open()) {
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// start thread1 and wait for it to park
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Thread thread1 = Thread.startVirtualThread(LockSupport::park);
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while (thread1.getState() != Thread.State.WAITING) {
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Thread.sleep(20);
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}
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// start thread2 to pin the carrier thread
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CountDownLatch latch = new CountDownLatch(1);
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Thread thread2 = Thread.startVirtualThread(() -> {
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latch.countDown();
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try {
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sel.select();
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} catch (ClosedSelectorException e) {
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// expected
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} catch (IOException ioe) {
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ioe.printStackTrace();
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}
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});
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latch.await(); // wait for thread2 to run
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// unpark thread1 and check that it is "stuck" in the runnable state
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// (the carrier thread is pinned, no other virtual thread can run)
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LockSupport.unpark(thread1);
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for (int i = 0; i < 5; i++) {
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assertTrue(thread1.getState() == Thread.State.RUNNABLE);
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Thread.sleep(100);
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}
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// print thread1's stack trace
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StackTraceElement[] stack = thread1.getStackTrace();
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assertTrue(stack.length > 0);
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for (StackTraceElement e : stack) {
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System.out.println(e);
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}
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}
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}
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static void assertTrue(boolean e) {
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if (!e) throw new RuntimeException();
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}
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}
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