1 /*
 2  * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 package org.openjdk.bench.java.lang;
24 
25 import java.util.concurrent.CountDownLatch;
26 import java.util.concurrent.TimeUnit;
27 import org.openjdk.jmh.annotations.*;
28 
29 @BenchmarkMode(Mode.AverageTime)
30 @OutputTimeUnit(TimeUnit.MICROSECONDS)
31 @State(Scope.Benchmark)
32 @Warmup(iterations = 5, time = 1)
33 @Measurement(iterations = 5, time = 1)
34 @Fork(value = 3)
35 public class VirtualThreadGetStackTraceWhenYielding {
36     private volatile boolean done;
37     private Thread thread;
38 
39     @Setup
40     public void setup() throws InterruptedException {
41         var started = new CountDownLatch(1);
42         thread = Thread.startVirtualThread(() -> {
43             started.countDown();
44             while (!done) {
45                 Thread.yield();
46             }
47         });
48         started.await();
49     }
50 
51     @TearDown
52     public void shutdown() throws InterruptedException {
53         done = true;
54         thread.join();
55     }
56 
57     @Benchmark
58     public StackTraceElement[] testGetStackTrace() {
59         return thread.getStackTrace();
60     }
61 }