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/*
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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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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Doug Lea with assistance from members of JCP JSR-166
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* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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* Other contributors include Andrew Wright, Jeffrey Hayes,
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* Pat Fisher, Mike Judd.
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*/
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import java.util.concurrent.atomic.AtomicMarkableReference;
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import junit.framework.Test;
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import junit.framework.TestSuite;
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public class AtomicMarkableReferenceTest extends JSR166TestCase {
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public static void main(String[] args) {
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main(suite(), args);
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}
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public static Test suite() {
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return new TestSuite(AtomicMarkableReferenceTest.class);
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}
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/**
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* constructor initializes to given reference and mark
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*/
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public void testConstructor() {
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
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assertSame(one, ai.getReference());
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assertFalse(ai.isMarked());
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AtomicMarkableReference a2 = new AtomicMarkableReference(null, true);
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assertNull(a2.getReference());
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assertTrue(a2.isMarked());
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}
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/**
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* get returns the last values of reference and mark set
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*/
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public void testGetSet() {
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boolean[] mark = new boolean[1];
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
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assertSame(one, ai.getReference());
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assertFalse(ai.isMarked());
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assertSame(one, ai.get(mark));
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assertFalse(mark[0]);
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ai.set(two, false);
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assertSame(two, ai.getReference());
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assertFalse(ai.isMarked());
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assertSame(two, ai.get(mark));
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assertFalse(mark[0]);
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ai.set(one, true);
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assertSame(one, ai.getReference());
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assertTrue(ai.isMarked());
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assertSame(one, ai.get(mark));
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assertTrue(mark[0]);
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}
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/**
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* attemptMark succeeds in single thread
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*/
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public void testAttemptMark() {
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boolean[] mark = new boolean[1];
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
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assertFalse(ai.isMarked());
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assertTrue(ai.attemptMark(one, true));
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assertTrue(ai.isMarked());
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assertSame(one, ai.get(mark));
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assertTrue(mark[0]);
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}
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/**
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* compareAndSet succeeds in changing values if equal to expected reference
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* and mark else fails
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*/
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public void testCompareAndSet() {
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boolean[] mark = new boolean[1];
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
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assertSame(one, ai.get(mark));
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assertFalse(ai.isMarked());
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assertFalse(mark[0]);
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assertTrue(ai.compareAndSet(one, two, false, false));
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assertSame(two, ai.get(mark));
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assertFalse(mark[0]);
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assertTrue(ai.compareAndSet(two, m3, false, true));
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assertSame(m3, ai.get(mark));
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assertTrue(mark[0]);
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assertFalse(ai.compareAndSet(two, m3, true, true));
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assertSame(m3, ai.get(mark));
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assertTrue(mark[0]);
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}
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/**
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* compareAndSet in one thread enables another waiting for reference value
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* to succeed
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*/
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public void testCompareAndSetInMultipleThreads() throws Exception {
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final AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
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Thread t = new Thread(new CheckedRunnable() {
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public void realRun() {
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while (!ai.compareAndSet(two, three, false, false))
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Thread.yield();
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}});
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t.start();
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assertTrue(ai.compareAndSet(one, two, false, false));
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t.join(LONG_DELAY_MS);
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assertFalse(t.isAlive());
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assertSame(three, ai.getReference());
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assertFalse(ai.isMarked());
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}
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/**
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* compareAndSet in one thread enables another waiting for mark value
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* to succeed
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*/
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public void testCompareAndSetInMultipleThreads2() throws Exception {
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final AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
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Thread t = new Thread(new CheckedRunnable() {
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public void realRun() {
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while (!ai.compareAndSet(one, one, true, false))
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Thread.yield();
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}});
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t.start();
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assertTrue(ai.compareAndSet(one, one, false, true));
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t.join(LONG_DELAY_MS);
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assertFalse(t.isAlive());
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assertSame(one, ai.getReference());
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assertFalse(ai.isMarked());
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}
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/**
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* repeated weakCompareAndSet succeeds in changing values when equal
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* to expected
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*/
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public void testWeakCompareAndSet() {
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boolean[] mark = new boolean[1];
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AtomicMarkableReference ai = new AtomicMarkableReference(one, false);
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assertSame(one, ai.get(mark));
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assertFalse(ai.isMarked());
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assertFalse(mark[0]);
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do {} while (!ai.weakCompareAndSet(one, two, false, false));
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assertSame(two, ai.get(mark));
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assertFalse(mark[0]);
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do {} while (!ai.weakCompareAndSet(two, m3, false, true));
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assertSame(m3, ai.get(mark));
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assertTrue(mark[0]);
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}
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}
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