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root/jsr166/jsr166/src/test/tck/AtomicStampedReferenceTest.java

Comparing jsr166/src/test/tck/AtomicStampedReferenceTest.java (file contents):
Revision 1.3 by dl, Sat Sep 20 18:20:07 2003 UTC vs.
Revision 1.16 by jsr166, Sat Oct 9 19:30:34 2010 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/licenses/publicdomain
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10		import java.util.concurrent.atomic.*;
11
12	<	public class AtomicStampedReferenceTest extends JSR166TestCase{
13	<	public static void main (String[] args) {
14	<	junit.textui.TestRunner.run (suite());
12	>	public class AtomicStampedReferenceTest extends JSR166TestCase {
13	>	public static void main(String[] args) {
14	>	junit.textui.TestRunner.run(suite());
15		}
16		public static Test suite() {
17		return new TestSuite(AtomicStampedReferenceTest.class);
18		}
19	<
19	>
20		/**
21	<	*
21	>	* constructor initializes to given reference and stamp
22		*/
23	<	public void testConstructor(){
23	>	public void testConstructor() {
24		AtomicStampedReference ai = new AtomicStampedReference(one, 0);
25	<	assertEquals(one,ai.getReference());
26	<	assertEquals(0, ai.getStamp());
25	>	assertSame(one,ai.getReference());
26	>	assertEquals(0, ai.getStamp());
27		AtomicStampedReference a2 = new AtomicStampedReference(null, 1);
28	<	assertNull(a2.getReference());
29	<	assertEquals(1, a2.getStamp());
29	<
28	>	assertNull(a2.getReference());
29	>	assertEquals(1, a2.getStamp());
30		}
31
32		/**
33	<	*
33	>	* get returns the last values of reference and stamp set
34		*/
35	<	public void testGetSet(){
35	>	public void testGetSet() {
36		int[] mark = new int[1];
37		AtomicStampedReference ai = new AtomicStampedReference(one, 0);
38	<	assertEquals(one,ai.getReference());
39	<	assertEquals(0, ai.getStamp());
40	<	assertEquals(one, ai.get(mark));
41	<	assertEquals(0, mark[0]);
42	<	ai.set(two, 0);
43	<	assertEquals(two,ai.getReference());
44	<	assertEquals(0, ai.getStamp());
45	<	assertEquals(two, ai.get(mark));
46	<	assertEquals(0, mark[0]);
47	<	ai.set(one, 1);
48	<	assertEquals(one,ai.getReference());
49	<	assertEquals(1, ai.getStamp());
50	<	assertEquals(one, ai.get(mark));
38	>	assertSame(one,ai.getReference());
39	>	assertEquals(0, ai.getStamp());
40	>	assertSame(one, ai.get(mark));
41	>	assertEquals(0, mark[0]);
42	>	ai.set(two, 0);
43	>	assertSame(two,ai.getReference());
44	>	assertEquals(0, ai.getStamp());
45	>	assertSame(two, ai.get(mark));
46	>	assertEquals(0, mark[0]);
47	>	ai.set(one, 1);
48	>	assertSame(one,ai.getReference());
49	>	assertEquals(1, ai.getStamp());
50	>	assertSame(one, ai.get(mark));
51		assertEquals(1,mark[0]);
52		}
53
54		/**
55	<	*
55	>	* attemptStamp succeeds in single thread
56		*/
57	<	public void testAttemptStamp(){
57	>	public void testAttemptStamp() {
58		int[] mark = new int[1];
59		AtomicStampedReference ai = new AtomicStampedReference(one, 0);
60		assertEquals(0, ai.getStamp());
61		assertTrue(ai.attemptStamp(one, 1));
62	<	assertEquals(1, ai.getStamp());
63	<	assertEquals(one, ai.get(mark));
62	>	assertEquals(1, ai.getStamp());
63	>	assertSame(one, ai.get(mark));
64		assertEquals(1, mark[0]);
65		}
66
67		/**
68	<	*
68	>	* compareAndSet succeeds in changing values if equal to expected reference
69	>	* and stamp else fails
70		*/
71	<	public void testCompareAndSet(){
71	>	public void testCompareAndSet() {
72		int[] mark = new int[1];
73		AtomicStampedReference ai = new AtomicStampedReference(one, 0);
74	<	assertEquals(one, ai.get(mark));
74	>	assertSame(one, ai.get(mark));
75		assertEquals(0, ai.getStamp());
76	<	assertEquals(0, mark[0]);
76	>	assertEquals(0, mark[0]);
77
78		assertTrue(ai.compareAndSet(one, two, 0, 0));
79	<	assertEquals(two, ai.get(mark));
80	<	assertEquals(0, mark[0]);
79	>	assertSame(two, ai.get(mark));
80	>	assertEquals(0, mark[0]);
81
82		assertTrue(ai.compareAndSet(two, m3, 0, 1));
83	<	assertEquals(m3, ai.get(mark));
84	<	assertEquals(1, mark[0]);
83	>	assertSame(m3, ai.get(mark));
84	>	assertEquals(1, mark[0]);
85
86		assertFalse(ai.compareAndSet(two, m3, 1, 1));
87	<	assertEquals(m3, ai.get(mark));
88	<	assertEquals(1, mark[0]);
87	>	assertSame(m3, ai.get(mark));
88	>	assertEquals(1, mark[0]);
89		}
90
91		/**
92	<	*
92	>	* compareAndSet in one thread enables another waiting for reference value
93	>	* to succeed
94		*/
95	<	public void testWeakCompareAndSet(){
95	>	public void testCompareAndSetInMultipleThreads() throws Exception {
96	>	final AtomicStampedReference ai = new AtomicStampedReference(one, 0);
97	>	Thread t = new Thread(new CheckedRunnable() {
98	>	public void realRun() {
99	>	while (!ai.compareAndSet(two, three, 0, 0))
100	>	Thread.yield();
101	>	}});
102	>
103	>	t.start();
104	>	assertTrue(ai.compareAndSet(one, two, 0, 0));
105	>	t.join(LONG_DELAY_MS);
106	>	assertFalse(t.isAlive());
107	>	assertSame(ai.getReference(), three);
108	>	assertEquals(ai.getStamp(), 0);
109	>	}
110	>
111	>	/**
112	>	* compareAndSet in one thread enables another waiting for stamp value
113	>	* to succeed
114	>	*/
115	>	public void testCompareAndSetInMultipleThreads2() throws Exception {
116	>	final AtomicStampedReference ai = new AtomicStampedReference(one, 0);
117	>	Thread t = new Thread(new CheckedRunnable() {
118	>	public void realRun() {
119	>	while (!ai.compareAndSet(one, one, 1, 2))
120	>	Thread.yield();
121	>	}});
122	>
123	>	t.start();
124	>	assertTrue(ai.compareAndSet(one, one, 0, 1));
125	>	t.join(LONG_DELAY_MS);
126	>	assertFalse(t.isAlive());
127	>	assertSame(ai.getReference(), one);
128	>	assertEquals(ai.getStamp(), 2);
129	>	}
130	>
131	>	/**
132	>	* repeated weakCompareAndSet succeeds in changing values when equal
133	>	* to expected
134	>	*/
135	>	public void testWeakCompareAndSet() {
136		int[] mark = new int[1];
137		AtomicStampedReference ai = new AtomicStampedReference(one, 0);
138	<	assertEquals(one, ai.get(mark));
139	<	assertEquals(0, ai.getStamp ());
140	<	assertEquals(0, mark[0]);
141	<
142	<	while(!ai.weakCompareAndSet(one, two, 0, 0));
143	<	assertEquals(two, ai.get(mark));
144	<	assertEquals(0, mark[0]);
145	<
146	<	while(!ai.weakCompareAndSet(two, m3, 0, 1));
147	<	assertEquals(m3, ai.get(mark));
148	<	assertEquals(1, mark[0]);
138	>	assertSame(one, ai.get(mark));
139	>	assertEquals(0, ai.getStamp());
140	>	assertEquals(0, mark[0]);
141	>
142	>	while (!ai.weakCompareAndSet(one, two, 0, 0));
143	>	assertSame(two, ai.get(mark));
144	>	assertEquals(0, mark[0]);
145	>
146	>	while (!ai.weakCompareAndSet(two, m3, 0, 1));
147	>	assertSame(m3, ai.get(mark));
148	>	assertEquals(1, mark[0]);
149		}
150
151		}

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