16 |
|
return new TestSuite(AtomicMarkableReferenceTest.class); |
17 |
|
} |
18 |
|
|
19 |
< |
static final Integer zero = new Integer(0); |
20 |
< |
static final Integer one = new Integer(1); |
21 |
< |
static final Integer two = new Integer(2); |
22 |
< |
static final Integer m3 = new Integer(-3); |
23 |
< |
|
19 |
> |
/** |
20 |
> |
* constructeor initializes to given reference and mark |
21 |
> |
*/ |
22 |
|
public void testConstructor(){ |
23 |
|
AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
24 |
|
assertEquals(one,ai.getReference()); |
29 |
|
|
30 |
|
} |
31 |
|
|
32 |
+ |
/** |
33 |
+ |
* get returns the last values of reference and mark set |
34 |
+ |
*/ |
35 |
|
public void testGetSet(){ |
36 |
|
boolean[] mark = new boolean[1]; |
37 |
|
AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
51 |
|
assertTrue(mark[0]); |
52 |
|
} |
53 |
|
|
54 |
+ |
/** |
55 |
+ |
* attemptMark succeeds in single thread |
56 |
+ |
*/ |
57 |
|
public void testAttemptMark(){ |
58 |
|
boolean[] mark = new boolean[1]; |
59 |
|
AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
64 |
|
assertTrue(mark[0]); |
65 |
|
} |
66 |
|
|
67 |
+ |
/** |
68 |
+ |
* compareAndSet succeeds in changing values if equal to expected reference |
69 |
+ |
* and mark else fails |
70 |
+ |
*/ |
71 |
|
public void testCompareAndSet(){ |
72 |
|
boolean[] mark = new boolean[1]; |
73 |
|
AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
88 |
|
assertTrue(mark[0]); |
89 |
|
} |
90 |
|
|
91 |
+ |
/** |
92 |
+ |
* compareAndSet in one thread enables another waiting for reference value |
93 |
+ |
* to succeed |
94 |
+ |
*/ |
95 |
+ |
public void testCompareAndSetInMultipleThreads() { |
96 |
+ |
final AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
97 |
+ |
Thread t = new Thread(new Runnable() { |
98 |
+ |
public void run() { |
99 |
+ |
while(!ai.compareAndSet(two, three, false, false)) Thread.yield(); |
100 |
+ |
}}); |
101 |
+ |
try { |
102 |
+ |
t.start(); |
103 |
+ |
assertTrue(ai.compareAndSet(one, two, false, false)); |
104 |
+ |
t.join(LONG_DELAY_MS); |
105 |
+ |
assertFalse(t.isAlive()); |
106 |
+ |
assertEquals(ai.getReference(), three); |
107 |
+ |
assertFalse(ai.isMarked()); |
108 |
+ |
} |
109 |
+ |
catch(Exception e) { |
110 |
+ |
unexpectedException(); |
111 |
+ |
} |
112 |
+ |
} |
113 |
+ |
|
114 |
+ |
/** |
115 |
+ |
* compareAndSet in one thread enables another waiting for mark value |
116 |
+ |
* to succeed |
117 |
+ |
*/ |
118 |
+ |
public void testCompareAndSetInMultipleThreads2() { |
119 |
+ |
final AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |
120 |
+ |
Thread t = new Thread(new Runnable() { |
121 |
+ |
public void run() { |
122 |
+ |
while(!ai.compareAndSet(one, one, true, false)) Thread.yield(); |
123 |
+ |
}}); |
124 |
+ |
try { |
125 |
+ |
t.start(); |
126 |
+ |
assertTrue(ai.compareAndSet(one, one, false, true)); |
127 |
+ |
t.join(LONG_DELAY_MS); |
128 |
+ |
assertFalse(t.isAlive()); |
129 |
+ |
assertEquals(ai.getReference(), one); |
130 |
+ |
assertFalse(ai.isMarked()); |
131 |
+ |
} |
132 |
+ |
catch(Exception e) { |
133 |
+ |
unexpectedException(); |
134 |
+ |
} |
135 |
+ |
} |
136 |
+ |
|
137 |
+ |
/** |
138 |
+ |
* repeated weakCompareAndSet succeeds in changing values when equal |
139 |
+ |
* to expected |
140 |
+ |
*/ |
141 |
|
public void testWeakCompareAndSet(){ |
142 |
|
boolean[] mark = new boolean[1]; |
143 |
|
AtomicMarkableReference ai = new AtomicMarkableReference(one, false); |