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

Comparing jsr166/src/test/tck/AtomicLongTest.java (file contents):
Revision 1.9 by dl, Sun Jan 11 01:31:34 2004 UTC vs.
Revision 1.34 by dl, Tue Jan 26 13:33:05 2021 UTC

#	Line 1 | Line 1
1		/*
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.
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
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	<	import java.io.*;
9	>	import java.util.concurrent.atomic.AtomicLong;
10	>
11	>	import junit.framework.Test;
12	>	import junit.framework.TestSuite;
13
14		public class AtomicLongTest extends JSR166TestCase {
15	<	public static void main (String[] args) {
16	<	junit.textui.TestRunner.run (suite());
15	>	public static void main(String[] args) {
16	>	main(suite(), args);
17		}
18		public static Test suite() {
19		return new TestSuite(AtomicLongTest.class);
20		}
21
22	+	final long[] VALUES = {
23	+	Long.MIN_VALUE,
24	+	Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE,
25	+	Long.MAX_VALUE,
26	+	};
27	+
28		/**
29		* constructor initializes to given value
30		*/
31	<	public void testConstructor(){
31	>	public void testConstructor() {
32		AtomicLong ai = new AtomicLong(1);
33	<	assertEquals(1,ai.get());
33	>	assertEquals(1, ai.get());
34		}
35
36		/**
37		* default constructed initializes to zero
38		*/
39	<	public void testConstructor2(){
39	>	public void testConstructor2() {
40		AtomicLong ai = new AtomicLong();
41	<	assertEquals(0,ai.get());
41	>	assertEquals(0, ai.get());
42		}
43
44		/**
45		* get returns the last value set
46		*/
47	<	public void testGetSet(){
47	>	public void testGetSet() {
48		AtomicLong ai = new AtomicLong(1);
49	<	assertEquals(1,ai.get());
50	<	ai.set(2);
51	<	assertEquals(2,ai.get());
52	<	ai.set(-3);
53	<	assertEquals(-3,ai.get());
47	<
49	>	assertEquals(1, ai.get());
50	>	ai.set(2);
51	>	assertEquals(2, ai.get());
52	>	ai.set(-3);
53	>	assertEquals(-3, ai.get());
54		}
55	+
56	+	/**
57	+	* get returns the last value lazySet in same thread
58	+	*/
59	+	public void testGetLazySet() {
60	+	AtomicLong ai = new AtomicLong(1);
61	+	assertEquals(1, ai.get());
62	+	ai.lazySet(2);
63	+	assertEquals(2, ai.get());
64	+	ai.lazySet(-3);
65	+	assertEquals(-3, ai.get());
66	+	}
67	+
68		/**
69		* compareAndSet succeeds in changing value if equal to expected else fails
70		*/
71	<	public void testCompareAndSet(){
71	>	public void testCompareAndSet() {
72		AtomicLong ai = new AtomicLong(1);
73	<	assertTrue(ai.compareAndSet(1,2));
74	<	assertTrue(ai.compareAndSet(2,-4));
75	<	assertEquals(-4,ai.get());
76	<	assertFalse(ai.compareAndSet(-5,7));
77	<	assertFalse((7 == ai.get()));
78	<	assertTrue(ai.compareAndSet(-4,7));
79	<	assertEquals(7,ai.get());
73	>	assertTrue(ai.compareAndSet(1, 2));
74	>	assertTrue(ai.compareAndSet(2, -4));
75	>	assertEquals(-4, ai.get());
76	>	assertFalse(ai.compareAndSet(-5, 7));
77	>	assertEquals(-4, ai.get());
78	>	assertTrue(ai.compareAndSet(-4, 7));
79	>	assertEquals(7, ai.get());
80		}
81
82		/**
83		* compareAndSet in one thread enables another waiting for value
84		* to succeed
85		*/
86	<	public void testCompareAndSetInMultipleThreads() {
86	>	public void testCompareAndSetInMultipleThreads() throws Exception {
87		final AtomicLong ai = new AtomicLong(1);
88	<	Thread t = new Thread(new Runnable() {
89	<	public void run() {
90	<	while(!ai.compareAndSet(2, 3)) Thread.yield();
91	<	}});
92	<	try {
93	<	t.start();
94	<	assertTrue(ai.compareAndSet(1, 2));
95	<	t.join(LONG_DELAY_MS);
96	<	assertFalse(t.isAlive());
97	<	assertEquals(ai.get(), 3);
98	<	}
80	<	catch(Exception e) {
81	<	unexpectedException();
82	<	}
88	>	Thread t = new Thread(new CheckedRunnable() {
89	>	public void realRun() {
90	>	while (!ai.compareAndSet(2, 3))
91	>	Thread.yield();
92	>	}});
93	>
94	>	t.start();
95	>	assertTrue(ai.compareAndSet(1, 2));
96	>	t.join(LONG_DELAY_MS);
97	>	assertFalse(t.isAlive());
98	>	assertEquals(3, ai.get());
99		}
100
101		/**
102		* repeated weakCompareAndSet succeeds in changing value when equal
103	<	* to expected
103	>	* to expected
104		*/
105	<	public void testWeakCompareAndSet(){
105	>	@SuppressWarnings("deprecation")
106	>	public void testWeakCompareAndSet() {
107		AtomicLong ai = new AtomicLong(1);
108	<	while(!ai.weakCompareAndSet(1,2));
109	<	while(!ai.weakCompareAndSet(2,-4));
110	<	assertEquals(-4,ai.get());
111	<	while(!ai.weakCompareAndSet(-4,7));
112	<	assertEquals(7,ai.get());
108	>	do {} while (!ai.weakCompareAndSet(1, 2));
109	>	do {} while (!ai.weakCompareAndSet(2, -4));
110	>	assertEquals(-4, ai.get());
111	>	do {} while (!ai.weakCompareAndSet(-4, 7));
112	>	assertEquals(7, ai.get());
113		}
114
115		/**
116		* getAndSet returns previous value and sets to given value
117		*/
118	<	public void testGetAndSet(){
118	>	public void testGetAndSet() {
119		AtomicLong ai = new AtomicLong(1);
120	<	assertEquals(1,ai.getAndSet(0));
121	<	assertEquals(0,ai.getAndSet(-10));
122	<	assertEquals(-10,ai.getAndSet(1));
120	>	assertEquals(1, ai.getAndSet(0));
121	>	assertEquals(0, ai.getAndSet(-10));
122	>	assertEquals(-10, ai.getAndSet(1));
123		}
124
125		/**
126		* getAndAdd returns previous value and adds given value
127		*/
128	<	public void testGetAndAdd(){
128	>	public void testGetAndAdd() {
129		AtomicLong ai = new AtomicLong(1);
130	<	assertEquals(1,ai.getAndAdd(2));
131	<	assertEquals(3,ai.get());
132	<	assertEquals(3,ai.getAndAdd(-4));
133	<	assertEquals(-1,ai.get());
130	>	assertEquals(1, ai.getAndAdd(2));
131	>	assertEquals(3, ai.get());
132	>	assertEquals(3, ai.getAndAdd(-4));
133	>	assertEquals(-1, ai.get());
134		}
135
136		/**
137		* getAndDecrement returns previous value and decrements
138		*/
139	<	public void testGetAndDecrement(){
139	>	public void testGetAndDecrement() {
140		AtomicLong ai = new AtomicLong(1);
141	<	assertEquals(1,ai.getAndDecrement());
142	<	assertEquals(0,ai.getAndDecrement());
143	<	assertEquals(-1,ai.getAndDecrement());
141	>	assertEquals(1, ai.getAndDecrement());
142	>	assertEquals(0, ai.getAndDecrement());
143	>	assertEquals(-1, ai.getAndDecrement());
144		}
145
146		/**
147		* getAndIncrement returns previous value and increments
148		*/
149	<	public void testGetAndIncrement(){
149	>	public void testGetAndIncrement() {
150		AtomicLong ai = new AtomicLong(1);
151	<	assertEquals(1,ai.getAndIncrement());
152	<	assertEquals(2,ai.get());
153	<	ai.set(-2);
154	<	assertEquals(-2,ai.getAndIncrement());
155	<	assertEquals(-1,ai.getAndIncrement());
156	<	assertEquals(0,ai.getAndIncrement());
157	<	assertEquals(1,ai.get());
151	>	assertEquals(1, ai.getAndIncrement());
152	>	assertEquals(2, ai.get());
153	>	ai.set(-2);
154	>	assertEquals(-2, ai.getAndIncrement());
155	>	assertEquals(-1, ai.getAndIncrement());
156	>	assertEquals(0, ai.getAndIncrement());
157	>	assertEquals(1, ai.get());
158		}
159
160		/**
161		* addAndGet adds given value to current, and returns current value
162		*/
163	<	public void testAddAndGet(){
163	>	public void testAddAndGet() {
164		AtomicLong ai = new AtomicLong(1);
165	<	assertEquals(3,ai.addAndGet(2));
166	<	assertEquals(3,ai.get());
167	<	assertEquals(-1,ai.addAndGet(-4));
168	<	assertEquals(-1,ai.get());
165	>	assertEquals(3, ai.addAndGet(2));
166	>	assertEquals(3, ai.get());
167	>	assertEquals(-1, ai.addAndGet(-4));
168	>	assertEquals(-1, ai.get());
169		}
170
171		/**
172		* decrementAndGet decrements and returns current value
173		*/
174	<	public void testDecrementAndGet(){
174	>	public void testDecrementAndGet() {
175		AtomicLong ai = new AtomicLong(1);
176	<	assertEquals(0,ai.decrementAndGet());
177	<	assertEquals(-1,ai.decrementAndGet());
178	<	assertEquals(-2,ai.decrementAndGet());
179	<	assertEquals(-2,ai.get());
176	>	assertEquals(0, ai.decrementAndGet());
177	>	assertEquals(-1, ai.decrementAndGet());
178	>	assertEquals(-2, ai.decrementAndGet());
179	>	assertEquals(-2, ai.get());
180		}
181
182		/**
183		* incrementAndGet increments and returns current value
184		*/
185	<	public void testIncrementAndGet(){
185	>	public void testIncrementAndGet() {
186		AtomicLong ai = new AtomicLong(1);
187	<	assertEquals(2,ai.incrementAndGet());
188	<	assertEquals(2,ai.get());
189	<	ai.set(-2);
190	<	assertEquals(-1,ai.incrementAndGet());
191	<	assertEquals(0,ai.incrementAndGet());
192	<	assertEquals(1,ai.incrementAndGet());
193	<	assertEquals(1,ai.get());
187	>	assertEquals(2, ai.incrementAndGet());
188	>	assertEquals(2, ai.get());
189	>	ai.set(-2);
190	>	assertEquals(-1, ai.incrementAndGet());
191	>	assertEquals(0, ai.incrementAndGet());
192	>	assertEquals(1, ai.incrementAndGet());
193	>	assertEquals(1, ai.get());
194		}
195
196		/**
197	<	* a deserialized serialized atomic holds same value
198	<	*/
199	<	public void testSerialization() {
200	<	AtomicLong l = new AtomicLong();
201	<
202	<	try {
203	<	l.set(-22);
204	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
205	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
206	<	out.writeObject(l);
207	<	out.close();
208	<
192	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
193	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
194	<	AtomicLong r = (AtomicLong) in.readObject();
195	<	assertEquals(l.get(), r.get());
196	<	} catch(Exception e){
197	<	unexpectedException();
198	<	}
197	>	* a deserialized/reserialized atomic holds same value
198	>	*/
199	>	public void testSerialization() throws Exception {
200	>	AtomicLong x = new AtomicLong();
201	>	AtomicLong y = serialClone(x);
202	>	assertNotSame(x, y);
203	>	x.set(-22);
204	>	AtomicLong z = serialClone(x);
205	>	assertNotSame(y, z);
206	>	assertEquals(-22, x.get());
207	>	assertEquals(0, y.get());
208	>	assertEquals(-22, z.get());
209		}
210
211		/**
212		* toString returns current value.
213	<	*/
213	>	*/
214		public void testToString() {
215		AtomicLong ai = new AtomicLong();
216	<	for (long i = -12; i < 6; ++i) {
217	<	ai.set(i);
218	<	assertEquals(ai.toString(), Long.toString(i));
216	>	assertEquals("0", ai.toString());
217	>	for (long x : VALUES) {
218	>	ai.set(x);
219	>	assertEquals(Long.toString(x), ai.toString());
220	>	}
221	>	}
222	>
223	>	/**
224	>	* intValue returns current value.
225	>	*/
226	>	public void testIntValue() {
227	>	AtomicLong ai = new AtomicLong();
228	>	assertEquals(0, ai.intValue());
229	>	for (long x : VALUES) {
230	>	ai.set(x);
231	>	assertEquals((int)x, ai.intValue());
232		}
233		}
234
235		/**
236		* longValue returns current value.
237	<	*/
237	>	*/
238		public void testLongValue() {
239		AtomicLong ai = new AtomicLong();
240	<	for (int i = -12; i < 6; ++i) {
241	<	ai.set(i);
242	<	assertEquals((long)i, ai.longValue());
240	>	assertEquals(0L, ai.longValue());
241	>	for (long x : VALUES) {
242	>	ai.set(x);
243	>	assertEquals(x, ai.longValue());
244		}
245		}
246
247		/**
248		* floatValue returns current value.
249	<	*/
249	>	*/
250		public void testFloatValue() {
251		AtomicLong ai = new AtomicLong();
252	<	for (int i = -12; i < 6; ++i) {
253	<	ai.set(i);
254	<	assertEquals((float)i, ai.floatValue());
252	>	assertEquals(0.0f, ai.floatValue());
253	>	for (long x : VALUES) {
254	>	ai.set(x);
255	>	assertEquals((float)x, ai.floatValue());
256		}
257		}
258
259		/**
260		* doubleValue returns current value.
261	<	*/
261	>	*/
262		public void testDoubleValue() {
263		AtomicLong ai = new AtomicLong();
264	<	for (int i = -12; i < 6; ++i) {
265	<	ai.set(i);
266	<	assertEquals((double)i, ai.doubleValue());
264	>	assertEquals(0.0d, ai.doubleValue());
265	>	for (long x : VALUES) {
266	>	ai.set(x);
267	>	assertEquals((double)x, ai.doubleValue());
268		}
269		}
270
245	–
271		}

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