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. |
5 |
> |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
> |
* Pat Fisher, Mike Judd. |
7 |
|
*/ |
8 |
|
|
9 |
|
import java.util.concurrent.atomic.*; |
15 |
|
int z; |
16 |
|
long w; |
17 |
|
|
18 |
< |
public static void main(String[] args){ |
18 |
> |
public static void main(String[] args) { |
19 |
|
junit.textui.TestRunner.run(suite()); |
20 |
|
} |
21 |
|
public static Test suite() { |
25 |
|
/** |
26 |
|
* Construction with non-existent field throws RuntimeException |
27 |
|
*/ |
28 |
< |
public void testConstructor(){ |
29 |
< |
try{ |
30 |
< |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
28 |
> |
public void testConstructor() { |
29 |
> |
try { |
30 |
> |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
31 |
|
a = AtomicLongFieldUpdater.newUpdater |
32 |
|
(AtomicLongFieldUpdaterTest.class, "y"); |
33 |
|
shouldThrow(); |
38 |
|
/** |
39 |
|
* construction with field not of given type throws RuntimeException |
40 |
|
*/ |
41 |
< |
public void testConstructor2(){ |
42 |
< |
try{ |
43 |
< |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
41 |
> |
public void testConstructor2() { |
42 |
> |
try { |
43 |
> |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
44 |
|
a = AtomicLongFieldUpdater.newUpdater |
45 |
|
(AtomicLongFieldUpdaterTest.class, "z"); |
46 |
|
shouldThrow(); |
51 |
|
/** |
52 |
|
* construction with non-volatile field throws RuntimeException |
53 |
|
*/ |
54 |
< |
public void testConstructor3(){ |
55 |
< |
try{ |
56 |
< |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
54 |
> |
public void testConstructor3() { |
55 |
> |
try { |
56 |
> |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> |
57 |
|
a = AtomicLongFieldUpdater.newUpdater |
58 |
|
(AtomicLongFieldUpdaterTest.class, "w"); |
59 |
|
shouldThrow(); |
65 |
|
/** |
66 |
|
* get returns the last value set or assigned |
67 |
|
*/ |
68 |
< |
public void testGetSet(){ |
68 |
> |
public void testGetSet() { |
69 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
70 |
|
try { |
71 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
73 |
|
return; |
74 |
|
} |
75 |
|
x = 1; |
76 |
< |
assertEquals(1,a.get(this)); |
77 |
< |
a.set(this,2); |
78 |
< |
assertEquals(2,a.get(this)); |
79 |
< |
a.set(this,-3); |
80 |
< |
assertEquals(-3,a.get(this)); |
76 |
> |
assertEquals(1,a.get(this)); |
77 |
> |
a.set(this,2); |
78 |
> |
assertEquals(2,a.get(this)); |
79 |
> |
a.set(this,-3); |
80 |
> |
assertEquals(-3,a.get(this)); |
81 |
|
} |
82 |
|
|
83 |
|
/** |
84 |
|
* get returns the last value lazySet by same thread |
85 |
|
*/ |
86 |
< |
public void testGetLazySet(){ |
86 |
> |
public void testGetLazySet() { |
87 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
88 |
|
try { |
89 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
91 |
|
return; |
92 |
|
} |
93 |
|
x = 1; |
94 |
< |
assertEquals(1,a.get(this)); |
95 |
< |
a.lazySet(this,2); |
96 |
< |
assertEquals(2,a.get(this)); |
97 |
< |
a.lazySet(this,-3); |
98 |
< |
assertEquals(-3,a.get(this)); |
94 |
> |
assertEquals(1,a.get(this)); |
95 |
> |
a.lazySet(this,2); |
96 |
> |
assertEquals(2,a.get(this)); |
97 |
> |
a.lazySet(this,-3); |
98 |
> |
assertEquals(-3,a.get(this)); |
99 |
|
} |
100 |
|
|
101 |
|
|
102 |
|
/** |
103 |
|
* compareAndSet succeeds in changing value if equal to expected else fails |
104 |
|
*/ |
105 |
< |
public void testCompareAndSet(){ |
105 |
> |
public void testCompareAndSet() { |
106 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
107 |
|
try { |
108 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
110 |
|
return; |
111 |
|
} |
112 |
|
x = 1; |
113 |
< |
assertTrue(a.compareAndSet(this,1,2)); |
114 |
< |
assertTrue(a.compareAndSet(this,2,-4)); |
115 |
< |
assertEquals(-4,a.get(this)); |
116 |
< |
assertFalse(a.compareAndSet(this,-5,7)); |
117 |
< |
assertFalse((7 == a.get(this))); |
118 |
< |
assertTrue(a.compareAndSet(this,-4,7)); |
119 |
< |
assertEquals(7,a.get(this)); |
113 |
> |
assertTrue(a.compareAndSet(this,1,2)); |
114 |
> |
assertTrue(a.compareAndSet(this,2,-4)); |
115 |
> |
assertEquals(-4,a.get(this)); |
116 |
> |
assertFalse(a.compareAndSet(this,-5,7)); |
117 |
> |
assertFalse((7 == a.get(this))); |
118 |
> |
assertTrue(a.compareAndSet(this,-4,7)); |
119 |
> |
assertEquals(7,a.get(this)); |
120 |
|
} |
121 |
|
|
122 |
|
|
124 |
|
* compareAndSet in one thread enables another waiting for value |
125 |
|
* to succeed |
126 |
|
*/ |
127 |
< |
public void testCompareAndSetInMultipleThreads() { |
127 |
> |
public void testCompareAndSetInMultipleThreads() throws Exception { |
128 |
|
x = 1; |
129 |
|
final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a; |
130 |
|
try { |
133 |
|
return; |
134 |
|
} |
135 |
|
|
136 |
< |
Thread t = new Thread(new Runnable() { |
137 |
< |
public void run() { |
138 |
< |
while(!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) Thread.yield(); |
139 |
< |
}}); |
140 |
< |
try { |
141 |
< |
t.start(); |
142 |
< |
assertTrue(a.compareAndSet(this, 1, 2)); |
143 |
< |
t.join(LONG_DELAY_MS); |
144 |
< |
assertFalse(t.isAlive()); |
145 |
< |
assertEquals(a.get(this), 3); |
146 |
< |
} |
147 |
< |
catch(Exception e) { |
148 |
< |
unexpectedException(); |
149 |
< |
} |
136 |
> |
Thread t = new Thread(new CheckedRunnable() { |
137 |
> |
public void realRun() { |
138 |
> |
while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) |
139 |
> |
Thread.yield(); |
140 |
> |
}}); |
141 |
> |
|
142 |
> |
t.start(); |
143 |
> |
assertTrue(a.compareAndSet(this, 1, 2)); |
144 |
> |
t.join(LONG_DELAY_MS); |
145 |
> |
assertFalse(t.isAlive()); |
146 |
> |
assertEquals(a.get(this), 3); |
147 |
|
} |
148 |
|
|
149 |
|
/** |
150 |
|
* repeated weakCompareAndSet succeeds in changing value when equal |
151 |
< |
* to expected |
151 |
> |
* to expected |
152 |
|
*/ |
153 |
< |
public void testWeakCompareAndSet(){ |
153 |
> |
public void testWeakCompareAndSet() { |
154 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
155 |
|
try { |
156 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
158 |
|
return; |
159 |
|
} |
160 |
|
x = 1; |
161 |
< |
while(!a.weakCompareAndSet(this,1,2)); |
162 |
< |
while(!a.weakCompareAndSet(this,2,-4)); |
163 |
< |
assertEquals(-4,a.get(this)); |
164 |
< |
while(!a.weakCompareAndSet(this,-4,7)); |
165 |
< |
assertEquals(7,a.get(this)); |
161 |
> |
while (!a.weakCompareAndSet(this,1,2)); |
162 |
> |
while (!a.weakCompareAndSet(this,2,-4)); |
163 |
> |
assertEquals(-4,a.get(this)); |
164 |
> |
while (!a.weakCompareAndSet(this,-4,7)); |
165 |
> |
assertEquals(7,a.get(this)); |
166 |
|
} |
167 |
|
|
168 |
|
/** |
169 |
|
* getAndSet returns previous value and sets to given value |
170 |
|
*/ |
171 |
< |
public void testGetAndSet(){ |
171 |
> |
public void testGetAndSet() { |
172 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
173 |
|
try { |
174 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
176 |
|
return; |
177 |
|
} |
178 |
|
x = 1; |
179 |
< |
assertEquals(1,a.getAndSet(this, 0)); |
180 |
< |
assertEquals(0,a.getAndSet(this,-10)); |
181 |
< |
assertEquals(-10,a.getAndSet(this,1)); |
179 |
> |
assertEquals(1,a.getAndSet(this, 0)); |
180 |
> |
assertEquals(0,a.getAndSet(this,-10)); |
181 |
> |
assertEquals(-10,a.getAndSet(this,1)); |
182 |
|
} |
183 |
|
|
184 |
|
/** |
185 |
|
* getAndAdd returns previous value and adds given value |
186 |
|
*/ |
187 |
< |
public void testGetAndAdd(){ |
187 |
> |
public void testGetAndAdd() { |
188 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
189 |
|
try { |
190 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
192 |
|
return; |
193 |
|
} |
194 |
|
x = 1; |
195 |
< |
assertEquals(1,a.getAndAdd(this,2)); |
196 |
< |
assertEquals(3,a.get(this)); |
197 |
< |
assertEquals(3,a.getAndAdd(this,-4)); |
198 |
< |
assertEquals(-1,a.get(this)); |
195 |
> |
assertEquals(1,a.getAndAdd(this,2)); |
196 |
> |
assertEquals(3,a.get(this)); |
197 |
> |
assertEquals(3,a.getAndAdd(this,-4)); |
198 |
> |
assertEquals(-1,a.get(this)); |
199 |
|
} |
200 |
|
|
201 |
|
/** |
202 |
|
* getAndDecrement returns previous value and decrements |
203 |
|
*/ |
204 |
< |
public void testGetAndDecrement(){ |
204 |
> |
public void testGetAndDecrement() { |
205 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
206 |
|
try { |
207 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
209 |
|
return; |
210 |
|
} |
211 |
|
x = 1; |
212 |
< |
assertEquals(1,a.getAndDecrement(this)); |
213 |
< |
assertEquals(0,a.getAndDecrement(this)); |
214 |
< |
assertEquals(-1,a.getAndDecrement(this)); |
212 |
> |
assertEquals(1,a.getAndDecrement(this)); |
213 |
> |
assertEquals(0,a.getAndDecrement(this)); |
214 |
> |
assertEquals(-1,a.getAndDecrement(this)); |
215 |
|
} |
216 |
|
|
217 |
|
/** |
218 |
|
* getAndIncrement returns previous value and increments |
219 |
|
*/ |
220 |
< |
public void testGetAndIncrement(){ |
220 |
> |
public void testGetAndIncrement() { |
221 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
222 |
|
try { |
223 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
225 |
|
return; |
226 |
|
} |
227 |
|
x = 1; |
228 |
< |
assertEquals(1,a.getAndIncrement(this)); |
229 |
< |
assertEquals(2,a.get(this)); |
230 |
< |
a.set(this,-2); |
231 |
< |
assertEquals(-2,a.getAndIncrement(this)); |
232 |
< |
assertEquals(-1,a.getAndIncrement(this)); |
233 |
< |
assertEquals(0,a.getAndIncrement(this)); |
234 |
< |
assertEquals(1,a.get(this)); |
228 |
> |
assertEquals(1,a.getAndIncrement(this)); |
229 |
> |
assertEquals(2,a.get(this)); |
230 |
> |
a.set(this,-2); |
231 |
> |
assertEquals(-2,a.getAndIncrement(this)); |
232 |
> |
assertEquals(-1,a.getAndIncrement(this)); |
233 |
> |
assertEquals(0,a.getAndIncrement(this)); |
234 |
> |
assertEquals(1,a.get(this)); |
235 |
|
} |
236 |
|
|
237 |
|
/** |
238 |
|
* addAndGet adds given value to current, and returns current value |
239 |
|
*/ |
240 |
< |
public void testAddAndGet(){ |
240 |
> |
public void testAddAndGet() { |
241 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
242 |
|
try { |
243 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
245 |
|
return; |
246 |
|
} |
247 |
|
x = 1; |
248 |
< |
assertEquals(3,a.addAndGet(this,2)); |
249 |
< |
assertEquals(3,a.get(this)); |
250 |
< |
assertEquals(-1,a.addAndGet(this,-4)); |
251 |
< |
assertEquals(-1,a.get(this)); |
248 |
> |
assertEquals(3,a.addAndGet(this,2)); |
249 |
> |
assertEquals(3,a.get(this)); |
250 |
> |
assertEquals(-1,a.addAndGet(this,-4)); |
251 |
> |
assertEquals(-1,a.get(this)); |
252 |
|
} |
253 |
|
|
254 |
|
/** |
255 |
|
* decrementAndGet decrements and returns current value |
256 |
|
*/ |
257 |
< |
public void testDecrementAndGet(){ |
257 |
> |
public void testDecrementAndGet() { |
258 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
259 |
|
try { |
260 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
262 |
|
return; |
263 |
|
} |
264 |
|
x = 1; |
265 |
< |
assertEquals(0,a.decrementAndGet(this)); |
266 |
< |
assertEquals(-1,a.decrementAndGet(this)); |
267 |
< |
assertEquals(-2,a.decrementAndGet(this)); |
268 |
< |
assertEquals(-2,a.get(this)); |
265 |
> |
assertEquals(0,a.decrementAndGet(this)); |
266 |
> |
assertEquals(-1,a.decrementAndGet(this)); |
267 |
> |
assertEquals(-2,a.decrementAndGet(this)); |
268 |
> |
assertEquals(-2,a.get(this)); |
269 |
|
} |
270 |
|
|
271 |
|
/** |
272 |
|
* incrementAndGet increments and returns current value |
273 |
|
*/ |
274 |
< |
public void testIncrementAndGet(){ |
274 |
> |
public void testIncrementAndGet() { |
275 |
|
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
276 |
|
try { |
277 |
|
a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x"); |
279 |
|
return; |
280 |
|
} |
281 |
|
x = 1; |
282 |
< |
assertEquals(2,a.incrementAndGet(this)); |
283 |
< |
assertEquals(2,a.get(this)); |
284 |
< |
a.set(this,-2); |
285 |
< |
assertEquals(-1,a.incrementAndGet(this)); |
286 |
< |
assertEquals(0,a.incrementAndGet(this)); |
287 |
< |
assertEquals(1,a.incrementAndGet(this)); |
288 |
< |
assertEquals(1,a.get(this)); |
282 |
> |
assertEquals(2,a.incrementAndGet(this)); |
283 |
> |
assertEquals(2,a.get(this)); |
284 |
> |
a.set(this,-2); |
285 |
> |
assertEquals(-1,a.incrementAndGet(this)); |
286 |
> |
assertEquals(0,a.incrementAndGet(this)); |
287 |
> |
assertEquals(1,a.incrementAndGet(this)); |
288 |
> |
assertEquals(1,a.get(this)); |
289 |
|
} |
290 |
|
|
291 |
|
} |