1 /*
 2  * Copyright (c) 2020, 2024, 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 
24 /*
25  * @test
26  * @summary Stress test timed park when pinned
27  * @requires vm.debug != true
28  * @library /test/lib
29  * @run main/othervm --enable-native-access=ALL-UNNAMED PinALot 500000
30  */
31 
32 /*
33  * @test
34  * @requires vm.debug == true
35  * @library /test/lib
36  * @run main/othervm/timeout=300 --enable-native-access=ALL-UNNAMED PinALot 200000
37  */
38 
39 import java.time.Duration;
40 import java.time.Instant;
41 import java.util.concurrent.atomic.AtomicInteger;
42 import java.util.concurrent.locks.LockSupport;
43 
44 import jdk.test.lib.thread.VThreadPinner;
45 
46 public class PinALot {
47 
48     public static void main(String[] args) throws Exception {
49         int iterations;
50         if (args.length > 0) {
51             iterations = Integer.parseInt(args[0]);
52         } else {
53             iterations = 1_000_000;
54         }
55 
56         AtomicInteger count = new AtomicInteger();
57         Thread thread = Thread.ofVirtual().start(() -> {
58             VThreadPinner.runPinned(() -> {
59                 while (count.incrementAndGet() < iterations) {
60                     LockSupport.parkNanos(1);
61                 }
62             });
63         });
64 
65         boolean terminated;
66         do {
67             terminated = thread.join(Duration.ofSeconds(1));
68             System.out.println(Instant.now() + " => " + count.get() + " of " + iterations);
69         } while (!terminated);
70 
71         int countValue = count.get();
72         if (countValue != iterations) {
73             throw new RuntimeException("Thread terminated, count=" + countValue);
74         }
75     }
76 }