1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
* 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.
*/
package jsr166;
import java.util.concurrent.atomic.AtomicBoolean;
import junit.framework.Test;
import junit.framework.TestSuite;
public class AtomicBooleanTest extends JSR166TestCase {
// android-note: Removed because the CTS runner does a bad job of
// retrying tests that have suite() declarations.
//
// public static void main(String[] args) {
// main(suite(), args);
// }
// public static Test suite() {
// return new TestSuite(...);
// }
/**
* constructor initializes to given value
*/
public void testConstructor() {
assertTrue(new AtomicBoolean(true).get());
assertFalse(new AtomicBoolean(false).get());
}
/**
* default constructed initializes to false
*/
public void testConstructor2() {
AtomicBoolean ai = new AtomicBoolean();
assertFalse(ai.get());
}
/**
* get returns the last value set
*/
public void testGetSet() {
AtomicBoolean ai = new AtomicBoolean(true);
assertTrue(ai.get());
ai.set(false);
assertFalse(ai.get());
ai.set(true);
assertTrue(ai.get());
}
/**
* get returns the last value lazySet in same thread
*/
public void testGetLazySet() {
AtomicBoolean ai = new AtomicBoolean(true);
assertTrue(ai.get());
ai.lazySet(false);
assertFalse(ai.get());
ai.lazySet(true);
assertTrue(ai.get());
}
/**
* compareAndSet succeeds in changing value if equal to expected else fails
*/
public void testCompareAndSet() {
AtomicBoolean ai = new AtomicBoolean(true);
assertTrue(ai.compareAndSet(true, false));
assertFalse(ai.get());
assertTrue(ai.compareAndSet(false, false));
assertFalse(ai.get());
assertFalse(ai.compareAndSet(true, false));
assertFalse(ai.get());
assertTrue(ai.compareAndSet(false, true));
assertTrue(ai.get());
}
/**
* compareAndSet in one thread enables another waiting for value
* to succeed
*/
public void testCompareAndSetInMultipleThreads() throws Exception {
final AtomicBoolean ai = new AtomicBoolean(true);
Thread t = new Thread(new CheckedRunnable() {
public void realRun() {
while (!ai.compareAndSet(false, true)) Thread.yield();
}});
t.start();
assertTrue(ai.compareAndSet(true, false));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
}
/**
* repeated weakCompareAndSet succeeds in changing value when equal
* to expected
*/
public void testWeakCompareAndSet() {
AtomicBoolean ai = new AtomicBoolean(true);
do {} while (!ai.weakCompareAndSet(true, false));
assertFalse(ai.get());
do {} while (!ai.weakCompareAndSet(false, false));
assertFalse(ai.get());
do {} while (!ai.weakCompareAndSet(false, true));
assertTrue(ai.get());
}
/**
* getAndSet returns previous value and sets to given value
*/
public void testGetAndSet() {
AtomicBoolean ai = new AtomicBoolean(true);
assertEquals(true, ai.getAndSet(false));
assertEquals(false, ai.getAndSet(false));
assertEquals(false, ai.getAndSet(true));
assertTrue(ai.get());
}
/**
* a deserialized serialized atomic holds same value
*/
public void testSerialization() throws Exception {
AtomicBoolean x = new AtomicBoolean();
AtomicBoolean y = serialClone(x);
x.set(true);
AtomicBoolean z = serialClone(x);
assertTrue(x.get());
assertFalse(y.get());
assertTrue(z.get());
}
/**
* toString returns current value.
*/
public void testToString() {
AtomicBoolean ai = new AtomicBoolean();
assertEquals(Boolean.toString(false), ai.toString());
ai.set(true);
assertEquals(Boolean.toString(true), ai.toString());
}
}
|
