86 lines
2.9 KiB
Java
86 lines
2.9 KiB
Java
/*
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* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @requires vm.continuations
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* @library /test/lib
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* @bug 8345294
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* @run main/othervm --enable-native-access=ALL-UNNAMED Starvation 100000
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*/
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import java.time.Duration;
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import java.time.Instant;
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import java.util.ArrayList;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.atomic.AtomicReference;
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import jdk.test.lib.thread.VThreadPinner;
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public class Starvation {
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public static void main(String[] args) throws Exception {
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int iterations = Integer.parseInt(args[0]);
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for (int i = 0; i < iterations; i++) {
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var exRef = new AtomicReference<Exception>();
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Thread thread = Thread.startVirtualThread(() -> {
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try {
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runTest();
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} catch (Exception e) {
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exRef.set(e);
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}
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});
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while (!thread.join(Duration.ofSeconds(1))) {
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System.out.format("%s iteration %d waiting for %s%n", Instant.now(), i, thread);
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}
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Exception ex = exRef.get();
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if (ex != null) {
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throw ex;
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}
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}
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}
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static void runTest() throws InterruptedException {
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int nprocs = Runtime.getRuntime().availableProcessors();
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var threads = new ArrayList<Thread>();
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Object lock = new Object();
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synchronized (lock) {
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for (int i = 0; i < nprocs - 1; i++) {
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var started = new CountDownLatch(1);
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Thread thread = Thread.startVirtualThread(() -> {
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started.countDown();
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VThreadPinner.runPinned(() -> {
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synchronized (lock) {
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}
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});
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});
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started.await();
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threads.add(thread);
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}
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}
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for (Thread t : threads) {
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t.join();
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}
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}
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}
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