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Comparing jsr166/src/test/tck/AtomicStampedReferenceTest.java (file contents):
Revision 1.3 by dl, Sat Sep 20 18:20:07 2003 UTC vs.
Revision 1.11 by jsr166, Tue Nov 17 03:12:51 2009 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{
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());
# Line 30 | Line 31 | public class AtomicStampedReferenceTest
31      }
32  
33      /**
34 <     *
34 >     *  get returns the last values of reference and stamp set
35       */
36 <    public void testGetSet(){
36 >    public void testGetSet() {
37          int[] mark = new int[1];
38          AtomicStampedReference ai = new AtomicStampedReference(one, 0);
39          assertEquals(one,ai.getReference());
# Line 52 | Line 53 | public class AtomicStampedReferenceTest
53      }
54  
55      /**
56 <     *
56 >     *  attemptStamp succeeds in single thread
57       */
58 <    public void testAttemptStamp(){
58 >    public void testAttemptStamp() {
59          int[] mark = new int[1];
60          AtomicStampedReference ai = new AtomicStampedReference(one, 0);
61          assertEquals(0, ai.getStamp());
# Line 65 | Line 66 | public class AtomicStampedReferenceTest
66      }
67  
68      /**
69 <     *
69 >     * compareAndSet succeeds in changing values if equal to expected reference
70 >     * and stamp else fails
71       */
72 <    public void testCompareAndSet(){
72 >    public void testCompareAndSet() {
73          int[] mark = new int[1];
74          AtomicStampedReference ai = new AtomicStampedReference(one, 0);
75          assertEquals(one, ai.get(mark));
# Line 88 | Line 90 | public class AtomicStampedReferenceTest
90      }
91  
92      /**
93 <     *
93 >     * compareAndSet in one thread enables another waiting for reference value
94 >     * to succeed
95 >     */
96 >    public void testCompareAndSetInMultipleThreads() throws Exception {
97 >        final AtomicStampedReference ai = new AtomicStampedReference(one, 0);
98 >        Thread t = new Thread(new Runnable() {
99 >                public void run() {
100 >                    while (!ai.compareAndSet(two, three, 0, 0)) 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 >        assertEquals(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 Runnable() {
118 >                public void run() {
119 >                    while (!ai.compareAndSet(one, one, 1, 2)) Thread.yield();
120 >                }});
121 >
122 >        t.start();
123 >        assertTrue(ai.compareAndSet(one, one, 0, 1));
124 >        t.join(LONG_DELAY_MS);
125 >        assertFalse(t.isAlive());
126 >        assertEquals(ai.getReference(), one);
127 >        assertEquals(ai.getStamp(), 2);
128 >    }
129 >
130 >    /**
131 >     * repeated weakCompareAndSet succeeds in changing values when equal
132 >     * to expected
133       */
134 <    public void testWeakCompareAndSet(){
134 >    public void testWeakCompareAndSet() {
135          int[] mark = new int[1];
136          AtomicStampedReference ai = new AtomicStampedReference(one, 0);
137          assertEquals(one, ai.get(mark));
138          assertEquals(0, ai.getStamp ());
139          assertEquals(0, mark[0]);
140  
141 <        while(!ai.weakCompareAndSet(one, two, 0, 0));
141 >        while (!ai.weakCompareAndSet(one, two, 0, 0));
142          assertEquals(two, ai.get(mark));
143          assertEquals(0, mark[0]);
144  
145 <        while(!ai.weakCompareAndSet(two, m3, 0, 1));
145 >        while (!ai.weakCompareAndSet(two, m3, 0, 1));
146          assertEquals(m3, ai.get(mark));
147          assertEquals(1, mark[0]);
148      }

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