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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 id=monitorenter
* @bug 8345266
* @summary Test OOM while trying to unmount vthread on monitorenter
* @requires vm.continuations & vm.gc.G1 & vm.opt.DisableExplicitGC != "true"
* @library /test/lib
* @run main/othervm -XX:+UseG1GC -Xmx48M MonitorEnterWaitOOME false
*/
/*
* @test id=timedwait
* @summary Test OOM while trying to unmount vthread on Object.wait
* @requires vm.continuations & vm.gc.G1 & vm.opt.DisableExplicitGC != "true"
* @library /test/lib
* @run main/othervm -XX:+UseG1GC -Xmx48M MonitorEnterWaitOOME true 5
*/
/*
* @test id=untimedwait
* @summary Test OOM while trying to unmount vthread on Object.wait
* @requires vm.continuations & vm.gc.G1 & vm.opt.DisableExplicitGC != "true"
* @library /test/lib
* @run main/othervm -XX:+UseG1GC -Xmx48M MonitorEnterWaitOOME true 0
*/
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import jdk.test.lib.thread.VThreadRunner;
public class MonitorEnterWaitOOME {
static volatile Object data;
static Thread.State dummyState = Thread.State.RUNNABLE; // load java.lang.Thread$State
public static void main(String[] args) throws Throwable {
final boolean testWait = args.length >= 1 ? Boolean.parseBoolean(args[0]) : false;
final long timeout = testWait && args.length == 2 ? Long.parseLong(args[1]) : 0L;
VThreadRunner.ensureParallelism(2);
Thread vthread;
var lock = new Object();
var canFillHeap = new AtomicBoolean();
var heapFilled = new AtomicBoolean();
var heapCollected = new AtomicBoolean();
var exRef = new AtomicReference<Throwable>();
synchronized (lock) {
vthread = Thread.ofVirtual().start(() -> {
try {
awaitTrue(canFillHeap);
data = fillHeap();
heapFilled.set(true);
synchronized (lock) {
if (testWait) {
lock.wait(timeout);
}
}
data = null;
System.gc();
heapCollected.set(true);
} catch (Throwable e) {
data = null;
System.gc(); // avoid nested OOME
exRef.set(e);
}
});
canFillHeap.set(true);
awaitTrue(heapFilled);
awaitState(vthread, Thread.State.BLOCKED);
}
if (testWait && timeout == 0) {
awaitState(vthread, Thread.State.WAITING);
synchronized (lock) {
lock.notify();
}
}
joinVThread(vthread, heapCollected, exRef);
assert exRef.get() == null;
}
private static Object[] fillHeap() {
Object[] first = null, last = null;
int size = 1 << 20;
while (size > 0) {
try {
Object[] array = new Object[size];
if (first == null) {
first = array;
} else {
last[0] = array;
}
last = array;
} catch (OutOfMemoryError oome) {
size = size >>> 1;
}
}
return first;
}
private static void awaitTrue(AtomicBoolean ready) {
// Don't call anything that might allocate from the Java heap.
while (!ready.get()) {
Thread.onSpinWait();
}
}
private static void awaitState(Thread thread, Thread.State expectedState) {
// Don't call anything that might allocate from the Java heap.
while (thread.getState() != expectedState) {
Thread.onSpinWait();
}
}
private static void joinVThread(Thread vthread, AtomicBoolean ready, AtomicReference<Throwable> exRef) throws Throwable {
// Don't call anything that might allocate from the Java heap until ready is set.
while (!ready.get()) {
Throwable ex = exRef.get();
if (ex != null) {
throw ex;
}
Thread.onSpinWait();
}
vthread.join();
}
}
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