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
24 /*
25 * @test
26 * @modules java.base/jdk.internal.foreign
27 * @build NativeTestHelper TestBufferStackStress
28 * @run junit TestBufferStackStress
29 */
30
31 import jdk.internal.foreign.BufferStack;
32 import org.junit.jupiter.api.Test;
33
34 import java.lang.foreign.Arena;
35 import java.lang.foreign.MemorySegment;
36 import java.time.Duration;
37 import java.util.Arrays;
38 import java.util.stream.IntStream;
39
40 import static java.lang.foreign.ValueLayout.*;
41 import static java.time.temporal.ChronoUnit.SECONDS;
42 import static org.junit.jupiter.api.Assertions.*;
43
44 public class TestBufferStackStress {
45
46 @Test
47 public void stress() throws InterruptedException {
48 BufferStack stack = BufferStack.of(256, 1);
49 Thread[] vThreads = IntStream.range(0, 1024).mapToObj(_ ->
50 Thread.ofVirtual().start(() -> {
51 long threadId = Thread.currentThread().threadId();
52 while (!Thread.interrupted()) {
53 for (int i = 0; i < 1_000_000; i++) {
54 try (Arena arena = stack.pushFrame(JAVA_LONG.byteSize(), JAVA_LONG.byteAlignment())) {
55 // Try to assert no two vThreads get allocated the same stack space.
56 MemorySegment segment = arena.allocate(JAVA_LONG);
57 JAVA_LONG.varHandle().setVolatile(segment, 0L, threadId);
58 assertEquals(threadId, (long) JAVA_LONG.varHandle().getVolatile(segment, 0L));
59 }
60 }
61 Thread.yield(); // make sure the driver thread gets a chance.
62 }
63 })).toArray(Thread[]::new);
64 Thread.sleep(Duration.of(10, SECONDS));
65 Arrays.stream(vThreads).forEach(
66 thread -> {
67 assertTrue(thread.isAlive());
68 thread.interrupt();
69 });
70 }
71
72 }