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/*
* Copyright (c) 2021, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @summary Test Thread::getStackTrace on a virtual thread that is runnable-unmounted
* @requires vm.continuations
* @run main/othervm -Djdk.virtualThreadScheduler.maxPoolSize=1 GetStackTraceWhenRunnable
*/
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.LockSupport;
public class GetStackTraceWhenRunnable {
public static void main(String[] args) throws Exception {
// start thread1 and wait for it to park
Thread thread1 = Thread.startVirtualThread(LockSupport::park);
while (thread1.getState() != Thread.State.WAITING) {
Thread.sleep(20);
}
// start thread2 to pin the carrier thread
var started = new AtomicBoolean();
var done = new AtomicBoolean();
Thread thread2 = Thread.startVirtualThread(() -> {
started.set(true);
while (!done.get()) {
Thread.onSpinWait();
}
});
try {
// wait for thread2 to start
while (!started.get()) {
Thread.sleep(10);
}
// unpark thread1 and check that it is "stuck" in the runnable state
// (the carrier thread is pinned, no other virtual thread can run)
LockSupport.unpark(thread1);
for (int i = 0; i < 5; i++) {
assertTrue(thread1.getState() == Thread.State.RUNNABLE);
Thread.sleep(100);
}
// print thread1's stack trace
StackTraceElement[] stack = thread1.getStackTrace();
assertTrue(stack.length > 0);
for (StackTraceElement e : stack) {
System.out.println(e);
}
} finally {
done.set(true);
thread2.join();
thread1.join();
}
}
static void assertTrue(boolean e) {
if (!e) throw new RuntimeException();
}
}
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