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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/jdk/java/util/concurrent/tck/AtomicReferenceTest.java Normal file
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/*
* 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.
*/
/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
* Other contributors include Andrew Wright, Jeffrey Hayes,
* Pat Fisher, Mike Judd.
*/
import java.util.concurrent.atomic.AtomicReference;
import junit.framework.Test;
import junit.framework.TestSuite;
public class AtomicReferenceTest extends JSR166TestCase {
public static void main(String[] args) {
main(suite(), args);
}
public static Test suite() {
return new TestSuite(AtomicReferenceTest.class);
}
/**
* constructor initializes to given value
*/
public void testConstructor() {
AtomicReference<Item> ai = new AtomicReference<>(one);
assertSame(one, ai.get());
}
/**
* default constructed initializes to null
*/
public void testConstructor2() {
AtomicReference<Item> ai = new AtomicReference<>();
assertNull(ai.get());
}
/**
* get returns the last value set
*/
public void testGetSet() {
AtomicReference<Item> ai = new AtomicReference<>(one);
assertSame(one, ai.get());
ai.set(two);
assertSame(two, ai.get());
ai.set(minusThree);
assertSame(minusThree, ai.get());
}
/**
* get returns the last value lazySet in same thread
*/
public void testGetLazySet() {
AtomicReference<Item> ai = new AtomicReference<>(one);
assertSame(one, ai.get());
ai.lazySet(two);
assertSame(two, ai.get());
ai.lazySet(minusThree);
assertSame(minusThree, ai.get());
}
/**
* compareAndSet succeeds in changing value if equal to expected else fails
*/
public void testCompareAndSet() {
AtomicReference<Item> ai = new AtomicReference<>(one);
assertTrue(ai.compareAndSet(one, two));
assertTrue(ai.compareAndSet(two, minusFour));
assertSame(minusFour, ai.get());
assertFalse(ai.compareAndSet(minusFive, seven));
assertSame(minusFour, ai.get());
assertTrue(ai.compareAndSet(minusFour, seven));
assertSame(seven, ai.get());
}
/**
* compareAndSet in one thread enables another waiting for value
* to succeed
*/
public void testCompareAndSetInMultipleThreads() throws Exception {
final AtomicReference<Item> ai = new AtomicReference<>(one);
Thread t = new Thread(new CheckedRunnable() {
public void realRun() {
while (!ai.compareAndSet(two, three))
Thread.yield();
}});
t.start();
assertTrue(ai.compareAndSet(one, two));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
assertSame(three, ai.get());
}
/**
* repeated weakCompareAndSet succeeds in changing value when equal
* to expected
*/
@SuppressWarnings("deprecation")
public void testWeakCompareAndSet() {
AtomicReference<Item> ai = new AtomicReference<>(one);
do {} while (!ai.weakCompareAndSet(one, two));
do {} while (!ai.weakCompareAndSet(two, minusFour));
assertSame(minusFour, ai.get());
do {} while (!ai.weakCompareAndSet(minusFour, seven));
assertSame(seven, ai.get());
}
/**
* getAndSet returns previous value and sets to given value
*/
public void testGetAndSet() {
AtomicReference<Item> ai = new AtomicReference<>(one);
assertSame(one, ai.getAndSet(zero));
assertSame(zero, ai.getAndSet(minusTen));
assertSame(minusTen, ai.getAndSet(one));
}
/**
* a deserialized/reserialized atomic holds same value
*/
public void testSerialization() throws Exception {
AtomicReference<Item> x = new AtomicReference<>();
AtomicReference<Item> y = serialClone(x);
assertNotSame(x, y);
x.set(one);
AtomicReference<Item> z = serialClone(x);
assertNotSame(y, z);
assertEquals(one, x.get());
assertNull(y.get());
assertEquals(one, z.get());
}
/**
* toString returns current value.
*/
public void testToString() {
AtomicReference<Item> ai = new AtomicReference<>(one);
assertEquals(one.toString(), ai.toString());
ai.set(two);
assertEquals(two.toString(), ai.toString());
}
}