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/*
* Copyright (c) 2025, 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
* @modules java.base/jdk.internal.foreign
* @build NativeTestHelper TestBufferStackStress
* @run junit TestBufferStackStress
*/
import jdk.internal.foreign.BufferStack;
import org.junit.jupiter.api.Test;
import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import java.time.Duration;
import java.util.Arrays;
import java.util.stream.IntStream;
import static java.lang.foreign.ValueLayout.*;
import static java.time.temporal.ChronoUnit.SECONDS;
import static org.junit.jupiter.api.Assertions.*;
public class TestBufferStackStress {
@Test
public void stress() throws InterruptedException {
BufferStack stack = BufferStack.of(256, 1);
Thread[] vThreads = IntStream.range(0, 1024).mapToObj(_ ->
Thread.ofVirtual().start(() -> {
long threadId = Thread.currentThread().threadId();
while (!Thread.interrupted()) {
for (int i = 0; i < 1_000_000; i++) {
try (Arena arena = stack.pushFrame(JAVA_LONG.byteSize(), JAVA_LONG.byteAlignment())) {
// Try to assert no two vThreads get allocated the same stack space.
MemorySegment segment = arena.allocate(JAVA_LONG);
JAVA_LONG.varHandle().setVolatile(segment, 0L, threadId);
assertEquals(threadId, (long) JAVA_LONG.varHandle().getVolatile(segment, 0L));
}
}
Thread.yield(); // make sure the driver thread gets a chance.
}
})).toArray(Thread[]::new);
Thread.sleep(Duration.of(10, SECONDS));
Arrays.stream(vThreads).forEach(
thread -> {
assertTrue(thread.isAlive());
thread.interrupt();
});
}
}
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