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/*
* Copyright (c) 2022, JetBrains s.r.o.. 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.
*/
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Supplier;
import javax.swing.SwingUtilities;
import sun.java2d.Disposer;
import sun.java2d.DisposerRecord;
/**
* @test
* @bug 8289208
* @summary Verifies Disposer robustness in a multi-threaded environment.
* @run main/othervm -mx128m TestDisposerRace
* @modules java.desktop/sun.java2d
*/
public final class TestDisposerRace {
private static final AtomicInteger recordsCount = new AtomicInteger();
private static volatile boolean disposerDone = false;
private static final String KO_OVERFLOW = "Some records have not been disposed!";
private static final String KO_UNDERFLOW = "Disposed more records than were added!";
public static void main(String[] args) throws Exception {
new TestDisposerRace().run();
checkRecordsCountIsSane();
if (recordsCount.get() > 0) {
System.err.println(KO_OVERFLOW); // In case the next line fails to allocate due to OOME
throw new RuntimeException("Some records (" + recordsCount + ") have not been disposed");
}
}
interface ThrowingRunnable<E extends Exception> {
void run() throws E;
}
TestDisposerRace() {
addRecordsToDisposer(30_000);
}
void run() throws Exception {
generateOOME();
for (int i = 0; i < 1000; ++i) {
retryOnOOME(() -> SwingUtilities.invokeAndWait(Disposer::pollRemove));
// Adding records will race with the diposer trying to remove them
if (i % 10 == 0)
addRecordsToDisposer(1000);
}
retryOnOOME(() -> Disposer.addObjectRecord(new Object(), new FinalDisposerRecord()));
while (!disposerDone) {
generateOOME();
}
}
private static void checkRecordsCountIsSane() {
if (recordsCount.get() < 0) {
throw new RuntimeException(KO_UNDERFLOW);
}
}
private static <T> T retryOnOOME(Supplier<T> allocator) {
for(;;) {
try {
return allocator.get();
} catch (OutOfMemoryError ignored1) {
try {
Thread.sleep(1); // Give GC a little chance to run
} catch (InterruptedException ignored2) {}
}
}
}
private static <E extends Exception> void retryOnOOME(ThrowingRunnable<E> tr) throws E {
for(;;) {
try {
tr.run();
break;
} catch (OutOfMemoryError ignored1) {
try {
Thread.sleep(1); // Give GC a little chance to run
} catch (InterruptedException ignored2) {}
}
}
}
private void addRecordsToDisposer(int count) {
checkRecordsCountIsSane();
MyDisposerRecord disposerRecord = retryOnOOME(MyDisposerRecord::new);
while(count > 0) {
recordsCount.incrementAndGet(); // pre-add to make sure it doesn't go negative
var o = retryOnOOME(Object::new);
retryOnOOME(() -> Disposer.addObjectRecord(o, disposerRecord));
--count;
}
}
class MyDisposerRecord implements DisposerRecord {
public void dispose() {
recordsCount.decrementAndGet();
}
}
class FinalDisposerRecord implements DisposerRecord {
public void dispose() {
disposerDone = true;
}
}
private static void giveGCAChance() {
try {
Thread.sleep(2000);
} catch (InterruptedException ignored) {}
}
private static void generateOOME() throws Exception {
try {
final List<Object> leak = new LinkedList<>();
while (true) {
leak.add(new byte[1024 * 1024]);
}
} catch (OutOfMemoryError ignored) {}
giveGCAChance();
}
}
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