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 java.util.concurrent.locks.LockSupport;
28 import org.openjdk.jmh.annotations.*;
29 
30 @BenchmarkMode(Mode.AverageTime)
31 @OutputTimeUnit(TimeUnit.MICROSECONDS)
32 @State(Scope.Benchmark)
33 @Warmup(iterations = 5, time = 1)
34 @Measurement(iterations = 5, time = 1)
35 @Fork(value = 3)
36 public class ThreadGetStackTraceWhenParked {
37     private volatile boolean done;
38     private Thread thread;
39 
40     @Setup
41     public void setup() throws InterruptedException {
42         var started = new CountDownLatch(1);
43         thread = Thread.ofPlatform().start(() -> {
44             started.countDown();
45             while (!done) {
46                 LockSupport.park();
47             }
48         });
49         started.await();
50     }
51 
52     @TearDown
53     public void shutdown() throws InterruptedException {
54         done = true;
55         LockSupport.unpark(thread);
56         thread.join();
57     }
58 
59     @Benchmark
60     public StackTraceElement[] testGetStackTrace() {
61         return thread.getStackTrace();
62     }
63 }