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/*
* Copyright (c) 2024, 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
* @library /test/lib
* @bug 8345294
* @run main/othervm --enable-native-access=ALL-UNNAMED Starvation 100000
*/
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;
import jdk.test.lib.thread.VThreadPinner;
public class Starvation {
public static void main(String[] args) throws Exception {
int iterations = Integer.parseInt(args[0]);
for (int i = 0; i < iterations; i++) {
var exRef = new AtomicReference<Exception>();
Thread thread = Thread.startVirtualThread(() -> {
try {
runTest();
} catch (Exception e) {
exRef.set(e);
}
});
while (!thread.join(Duration.ofSeconds(1))) {
System.out.format("%s iteration %d waiting for %s%n", Instant.now(), i, thread);
}
Exception ex = exRef.get();
if (ex != null) {
throw ex;
}
}
}
static void runTest() throws InterruptedException {
int nprocs = Runtime.getRuntime().availableProcessors();
var threads = new ArrayList<Thread>();
Object lock = new Object();
synchronized (lock) {
for (int i = 0; i < nprocs - 1; i++) {
var started = new CountDownLatch(1);
Thread thread = Thread.startVirtualThread(() -> {
started.countDown();
VThreadPinner.runPinned(() -> {
synchronized (lock) {
}
});
});
started.await();
threads.add(thread);
}
}
for (Thread t : threads) {
t.join();
}
}
}
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