5 |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
6 |
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*/ |
7 |
|
|
8 |
< |
import junit.framework.*; |
9 |
< |
import java.util.concurrent.atomic.AtomicBoolean; |
8 |
> |
import static java.util.concurrent.TimeUnit.DAYS; |
9 |
> |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
10 |
> |
|
11 |
> |
import java.util.ArrayList; |
12 |
> |
import java.util.List; |
13 |
> |
import java.util.concurrent.CountDownLatch; |
14 |
> |
import java.util.concurrent.Future; |
15 |
> |
import java.util.concurrent.TimeUnit; |
16 |
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import java.util.concurrent.locks.Lock; |
17 |
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import java.util.concurrent.locks.StampedLock; |
18 |
< |
import java.util.concurrent.CountDownLatch; |
19 |
< |
import static java.util.concurrent.TimeUnit.MILLISECONDS; |
20 |
< |
import java.util.*; |
21 |
< |
import java.util.concurrent.*; |
18 |
> |
import java.util.function.BiConsumer; |
19 |
> |
import java.util.function.Function; |
20 |
> |
|
21 |
> |
import junit.framework.Test; |
22 |
> |
import junit.framework.TestSuite; |
23 |
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|
24 |
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public class StampedLockTest extends JSR166TestCase { |
25 |
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public static void main(String[] args) { |
26 |
< |
junit.textui.TestRunner.run(suite()); |
26 |
> |
main(suite(), args); |
27 |
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} |
28 |
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public static Test suite() { |
29 |
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return new TestSuite(StampedLockTest.class); |
30 |
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} |
31 |
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|
32 |
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/** |
26 |
– |
* A runnable calling writeLockInterruptibly |
27 |
– |
*/ |
28 |
– |
class InterruptibleLockRunnable extends CheckedRunnable { |
29 |
– |
final StampedLock lock; |
30 |
– |
InterruptibleLockRunnable(StampedLock l) { lock = l; } |
31 |
– |
public void realRun() throws InterruptedException { |
32 |
– |
lock.writeLockInterruptibly(); |
33 |
– |
} |
34 |
– |
} |
35 |
– |
|
36 |
– |
/** |
37 |
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* A runnable calling writeLockInterruptibly that expects to be |
38 |
– |
* interrupted |
39 |
– |
*/ |
40 |
– |
class InterruptedLockRunnable extends CheckedInterruptedRunnable { |
41 |
– |
final StampedLock lock; |
42 |
– |
InterruptedLockRunnable(StampedLock l) { lock = l; } |
43 |
– |
public void realRun() throws InterruptedException { |
44 |
– |
lock.writeLockInterruptibly(); |
45 |
– |
} |
46 |
– |
} |
47 |
– |
|
48 |
– |
/** |
33 |
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* Releases write lock, checking isWriteLocked before and after |
34 |
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*/ |
35 |
< |
void releaseWriteLock(StampedLock lock, long s) { |
35 |
> |
void releaseWriteLock(StampedLock lock, long stamp) { |
36 |
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assertTrue(lock.isWriteLocked()); |
37 |
< |
lock.unlockWrite(s); |
37 |
> |
assertValid(lock, stamp); |
38 |
> |
lock.unlockWrite(stamp); |
39 |
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assertFalse(lock.isWriteLocked()); |
40 |
+ |
assertFalse(lock.validate(stamp)); |
41 |
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} |
42 |
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|
43 |
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/** |
44 |
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* Constructed StampedLock is in unlocked state |
44 |
> |
* Releases read lock, checking isReadLocked before and after |
45 |
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*/ |
46 |
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public void testConstructor() { |
47 |
< |
StampedLock lock; |
48 |
< |
lock = new StampedLock(); |
49 |
< |
assertFalse(lock.isWriteLocked()); |
46 |
> |
void releaseReadLock(StampedLock lock, long stamp) { |
47 |
> |
assertTrue(lock.isReadLocked()); |
48 |
> |
assertValid(lock, stamp); |
49 |
> |
lock.unlockRead(stamp); |
50 |
|
assertFalse(lock.isReadLocked()); |
51 |
< |
assertEquals(lock.getReadLockCount(), 0); |
51 |
> |
assertTrue(lock.validate(stamp)); |
52 |
|
} |
53 |
|
|
54 |
< |
/** |
55 |
< |
* write-locking and read-locking an unlocked lock succeed |
56 |
< |
*/ |
71 |
< |
public void testLock() { |
72 |
< |
StampedLock lock = new StampedLock(); |
73 |
< |
assertFalse(lock.isWriteLocked()); |
74 |
< |
assertFalse(lock.isReadLocked()); |
75 |
< |
assertEquals(lock.getReadLockCount(), 0); |
76 |
< |
long s = lock.writeLock(); |
77 |
< |
assertTrue(lock.isWriteLocked()); |
78 |
< |
assertFalse(lock.isReadLocked()); |
79 |
< |
assertEquals(lock.getReadLockCount(), 0); |
80 |
< |
lock.unlockWrite(s); |
81 |
< |
assertFalse(lock.isWriteLocked()); |
82 |
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assertFalse(lock.isReadLocked()); |
83 |
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assertEquals(lock.getReadLockCount(), 0); |
84 |
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long rs = lock.readLock(); |
85 |
< |
assertFalse(lock.isWriteLocked()); |
86 |
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assertTrue(lock.isReadLocked()); |
87 |
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assertEquals(lock.getReadLockCount(), 1); |
88 |
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lock.unlockRead(rs); |
89 |
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assertFalse(lock.isWriteLocked()); |
90 |
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assertFalse(lock.isReadLocked()); |
91 |
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assertEquals(lock.getReadLockCount(), 0); |
54 |
> |
long assertNonZero(long v) { |
55 |
> |
assertTrue(v != 0L); |
56 |
> |
return v; |
57 |
|
} |
58 |
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|
59 |
< |
/** |
60 |
< |
* unlock releases either a read or write lock |
61 |
< |
*/ |
62 |
< |
public void testUnlock() { |
98 |
< |
StampedLock lock = new StampedLock(); |
99 |
< |
assertFalse(lock.isWriteLocked()); |
100 |
< |
assertFalse(lock.isReadLocked()); |
101 |
< |
assertEquals(lock.getReadLockCount(), 0); |
102 |
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long s = lock.writeLock(); |
103 |
< |
assertTrue(lock.isWriteLocked()); |
104 |
< |
assertFalse(lock.isReadLocked()); |
105 |
< |
assertEquals(lock.getReadLockCount(), 0); |
106 |
< |
lock.unlock(s); |
107 |
< |
assertFalse(lock.isWriteLocked()); |
108 |
< |
assertFalse(lock.isReadLocked()); |
109 |
< |
assertEquals(lock.getReadLockCount(), 0); |
110 |
< |
long rs = lock.readLock(); |
111 |
< |
assertFalse(lock.isWriteLocked()); |
112 |
< |
assertTrue(lock.isReadLocked()); |
113 |
< |
assertEquals(lock.getReadLockCount(), 1); |
114 |
< |
lock.unlock(rs); |
115 |
< |
assertFalse(lock.isWriteLocked()); |
116 |
< |
assertFalse(lock.isReadLocked()); |
117 |
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assertEquals(lock.getReadLockCount(), 0); |
59 |
> |
long assertValid(StampedLock lock, long stamp) { |
60 |
> |
assertTrue(stamp != 0L); |
61 |
> |
assertTrue(lock.validate(stamp)); |
62 |
> |
return stamp; |
63 |
|
} |
64 |
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|
65 |
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/** |
121 |
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* tryUnlockRead/Write succeeds if locked in associated mode else |
122 |
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* returns false |
123 |
< |
*/ |
124 |
< |
public void testTryUnlock() { |
125 |
< |
StampedLock lock = new StampedLock(); |
126 |
< |
assertFalse(lock.isWriteLocked()); |
65 |
> |
void assertUnlocked(StampedLock lock) { |
66 |
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assertFalse(lock.isReadLocked()); |
128 |
– |
assertEquals(lock.getReadLockCount(), 0); |
129 |
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long s = lock.writeLock(); |
130 |
– |
assertTrue(lock.isWriteLocked()); |
131 |
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assertFalse(lock.isReadLocked()); |
132 |
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assertEquals(lock.getReadLockCount(), 0); |
133 |
– |
assertFalse(lock.tryUnlockRead()); |
134 |
– |
assertTrue(lock.tryUnlockWrite()); |
135 |
– |
assertFalse(lock.tryUnlockWrite()); |
136 |
– |
assertFalse(lock.tryUnlockRead()); |
67 |
|
assertFalse(lock.isWriteLocked()); |
68 |
< |
assertFalse(lock.isReadLocked()); |
69 |
< |
assertEquals(lock.getReadLockCount(), 0); |
140 |
< |
long rs = lock.readLock(); |
141 |
< |
assertFalse(lock.isWriteLocked()); |
142 |
< |
assertTrue(lock.isReadLocked()); |
143 |
< |
assertEquals(lock.getReadLockCount(), 1); |
144 |
< |
assertFalse(lock.tryUnlockWrite()); |
145 |
< |
assertTrue(lock.tryUnlockRead()); |
146 |
< |
assertFalse(lock.tryUnlockRead()); |
147 |
< |
assertFalse(lock.tryUnlockWrite()); |
148 |
< |
assertFalse(lock.isWriteLocked()); |
149 |
< |
assertFalse(lock.isReadLocked()); |
150 |
< |
assertEquals(lock.getReadLockCount(), 0); |
68 |
> |
assertEquals(0, lock.getReadLockCount()); |
69 |
> |
assertValid(lock, lock.tryOptimisticRead()); |
70 |
|
} |
71 |
|
|
72 |
< |
/** |
73 |
< |
* write-unlocking an unlocked lock throws IllegalMonitorStateException |
74 |
< |
*/ |
75 |
< |
public void testWriteUnlock_IMSE() { |
76 |
< |
StampedLock lock = new StampedLock(); |
77 |
< |
try { |
78 |
< |
lock.unlockWrite(0L); |
79 |
< |
shouldThrow(); |
80 |
< |
} catch (IllegalMonitorStateException success) {} |
72 |
> |
List<Action> lockLockers(Lock lock) { |
73 |
> |
List<Action> lockers = new ArrayList<>(); |
74 |
> |
lockers.add(() -> lock.lock()); |
75 |
> |
lockers.add(() -> lock.lockInterruptibly()); |
76 |
> |
lockers.add(() -> lock.tryLock()); |
77 |
> |
lockers.add(() -> lock.tryLock(Long.MIN_VALUE, DAYS)); |
78 |
> |
lockers.add(() -> lock.tryLock(0L, DAYS)); |
79 |
> |
lockers.add(() -> lock.tryLock(Long.MAX_VALUE, DAYS)); |
80 |
> |
return lockers; |
81 |
> |
} |
82 |
> |
|
83 |
> |
List<Function<StampedLock, Long>> readLockers() { |
84 |
> |
List<Function<StampedLock, Long>> readLockers = new ArrayList<>(); |
85 |
> |
readLockers.add(sl -> sl.readLock()); |
86 |
> |
readLockers.add(sl -> sl.tryReadLock()); |
87 |
> |
readLockers.add(sl -> readLockInterruptiblyUninterrupted(sl)); |
88 |
> |
readLockers.add(sl -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS)); |
89 |
> |
readLockers.add(sl -> tryReadLockUninterrupted(sl, 0L, DAYS)); |
90 |
> |
readLockers.add(sl -> sl.tryConvertToReadLock(sl.tryOptimisticRead())); |
91 |
> |
return readLockers; |
92 |
> |
} |
93 |
> |
|
94 |
> |
List<BiConsumer<StampedLock, Long>> readUnlockers() { |
95 |
> |
List<BiConsumer<StampedLock, Long>> readUnlockers = new ArrayList<>(); |
96 |
> |
readUnlockers.add((sl, stamp) -> sl.unlockRead(stamp)); |
97 |
> |
readUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockRead())); |
98 |
> |
readUnlockers.add((sl, stamp) -> sl.asReadLock().unlock()); |
99 |
> |
readUnlockers.add((sl, stamp) -> sl.unlock(stamp)); |
100 |
> |
readUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp))); |
101 |
> |
return readUnlockers; |
102 |
> |
} |
103 |
> |
|
104 |
> |
List<Function<StampedLock, Long>> writeLockers() { |
105 |
> |
List<Function<StampedLock, Long>> writeLockers = new ArrayList<>(); |
106 |
> |
writeLockers.add(sl -> sl.writeLock()); |
107 |
> |
writeLockers.add(sl -> sl.tryWriteLock()); |
108 |
> |
writeLockers.add(sl -> writeLockInterruptiblyUninterrupted(sl)); |
109 |
> |
writeLockers.add(sl -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS)); |
110 |
> |
writeLockers.add(sl -> tryWriteLockUninterrupted(sl, 0L, DAYS)); |
111 |
> |
writeLockers.add(sl -> sl.tryConvertToWriteLock(sl.tryOptimisticRead())); |
112 |
> |
return writeLockers; |
113 |
> |
} |
114 |
> |
|
115 |
> |
List<BiConsumer<StampedLock, Long>> writeUnlockers() { |
116 |
> |
List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>(); |
117 |
> |
writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp)); |
118 |
> |
writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite())); |
119 |
> |
writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock()); |
120 |
> |
writeUnlockers.add((sl, stamp) -> sl.unlock(stamp)); |
121 |
> |
writeUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp))); |
122 |
> |
return writeUnlockers; |
123 |
|
} |
124 |
|
|
125 |
|
/** |
126 |
< |
* write-unlocking an unlocked lock throws IllegalMonitorStateException |
126 |
> |
* Constructed StampedLock is in unlocked state |
127 |
|
*/ |
128 |
< |
public void testWriteUnlock_IMSE2() { |
129 |
< |
StampedLock lock = new StampedLock(); |
169 |
< |
try { |
170 |
< |
long s = lock.writeLock(); |
171 |
< |
lock.unlockWrite(s); |
172 |
< |
lock.unlockWrite(s); |
173 |
< |
shouldThrow(); |
174 |
< |
} catch (IllegalMonitorStateException success) {} |
128 |
> |
public void testConstructor() { |
129 |
> |
assertUnlocked(new StampedLock()); |
130 |
|
} |
131 |
|
|
132 |
|
/** |
133 |
< |
* write-unlocking after readlock throws IllegalMonitorStateException |
133 |
> |
* write-locking, then unlocking, an unlocked lock succeed |
134 |
|
*/ |
135 |
< |
public void testWriteUnlock_IMSE3() { |
135 |
> |
public void testWriteLock_lockUnlock() { |
136 |
|
StampedLock lock = new StampedLock(); |
137 |
< |
try { |
138 |
< |
long s = lock.readLock(); |
139 |
< |
lock.unlockWrite(s); |
140 |
< |
shouldThrow(); |
141 |
< |
} catch (IllegalMonitorStateException success) {} |
137 |
> |
|
138 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
139 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
140 |
> |
assertFalse(lock.isWriteLocked()); |
141 |
> |
assertFalse(lock.isReadLocked()); |
142 |
> |
assertEquals(0, lock.getReadLockCount()); |
143 |
> |
|
144 |
> |
long s = writeLocker.apply(lock); |
145 |
> |
assertValid(lock, s); |
146 |
> |
assertTrue(lock.isWriteLocked()); |
147 |
> |
assertFalse(lock.isReadLocked()); |
148 |
> |
assertEquals(0, lock.getReadLockCount()); |
149 |
> |
writeUnlocker.accept(lock, s); |
150 |
> |
assertUnlocked(lock); |
151 |
> |
} |
152 |
|
} |
153 |
|
|
154 |
|
/** |
155 |
< |
* read-unlocking an unlocked lock throws IllegalMonitorStateException |
155 |
> |
* read-locking, then unlocking, an unlocked lock succeed |
156 |
|
*/ |
157 |
< |
public void testReadUnlock_IMSE() { |
157 |
> |
public void testReadLock_lockUnlock() { |
158 |
|
StampedLock lock = new StampedLock(); |
159 |
< |
try { |
160 |
< |
long s = lock.readLock(); |
161 |
< |
lock.unlockRead(s); |
162 |
< |
lock.unlockRead(s); |
163 |
< |
shouldThrow(); |
164 |
< |
} catch (IllegalMonitorStateException success) {} |
159 |
> |
|
160 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) |
161 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
162 |
> |
long s = 42; |
163 |
> |
for (int i = 0; i < 2; i++) { |
164 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
165 |
> |
assertFalse(lock.isWriteLocked()); |
166 |
> |
assertTrue(lock.isReadLocked()); |
167 |
> |
assertEquals(i + 1, lock.getReadLockCount()); |
168 |
> |
} |
169 |
> |
for (int i = 0; i < 2; i++) { |
170 |
> |
assertFalse(lock.isWriteLocked()); |
171 |
> |
assertTrue(lock.isReadLocked()); |
172 |
> |
assertEquals(2 - i, lock.getReadLockCount()); |
173 |
> |
readUnlocker.accept(lock, s); |
174 |
> |
} |
175 |
> |
assertUnlocked(lock); |
176 |
> |
} |
177 |
|
} |
178 |
|
|
179 |
|
/** |
180 |
< |
* read-unlocking an unlocked lock throws IllegalMonitorStateException |
180 |
> |
* tryUnlockWrite fails if not write locked |
181 |
|
*/ |
182 |
< |
public void testReadUnlock_IMSE2() { |
182 |
> |
public void testTryUnlockWrite_failure() { |
183 |
|
StampedLock lock = new StampedLock(); |
184 |
< |
try { |
185 |
< |
lock.unlockRead(0L); |
186 |
< |
shouldThrow(); |
187 |
< |
} catch (IllegalMonitorStateException success) {} |
184 |
> |
assertFalse(lock.tryUnlockWrite()); |
185 |
> |
|
186 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) |
187 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
188 |
> |
long s = assertValid(lock, readLocker.apply(lock)); |
189 |
> |
assertFalse(lock.tryUnlockWrite()); |
190 |
> |
assertTrue(lock.isReadLocked()); |
191 |
> |
readUnlocker.accept(lock, s); |
192 |
> |
assertUnlocked(lock); |
193 |
> |
} |
194 |
|
} |
195 |
|
|
196 |
|
/** |
197 |
< |
* read-unlocking after writeLock throws IllegalMonitorStateException |
197 |
> |
* tryUnlockRead fails if not read locked |
198 |
|
*/ |
199 |
< |
public void testReadUnlock_IMSE3() { |
199 |
> |
public void testTryUnlockRead_failure() { |
200 |
|
StampedLock lock = new StampedLock(); |
201 |
< |
try { |
202 |
< |
long s = lock.writeLock(); |
203 |
< |
lock.unlockRead(s); |
204 |
< |
shouldThrow(); |
205 |
< |
} catch (IllegalMonitorStateException success) {} |
201 |
> |
assertFalse(lock.tryUnlockRead()); |
202 |
> |
|
203 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
204 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
205 |
> |
long s = writeLocker.apply(lock); |
206 |
> |
assertFalse(lock.tryUnlockRead()); |
207 |
> |
assertTrue(lock.isWriteLocked()); |
208 |
> |
writeUnlocker.accept(lock, s); |
209 |
> |
assertUnlocked(lock); |
210 |
> |
} |
211 |
|
} |
212 |
|
|
213 |
|
/** |
214 |
< |
* validate(0) fails |
214 |
> |
* validate(0L) fails |
215 |
|
*/ |
216 |
|
public void testValidate0() { |
217 |
|
StampedLock lock = new StampedLock(); |
219 |
|
} |
220 |
|
|
221 |
|
/** |
222 |
< |
* A stamp obtained from a successful lock operation validates |
222 |
> |
* A stamp obtained from a successful lock operation validates while the lock is held |
223 |
|
*/ |
224 |
< |
public void testValidate() { |
225 |
< |
try { |
226 |
< |
StampedLock lock = new StampedLock(); |
227 |
< |
long s = lock.writeLock(); |
228 |
< |
assertTrue(lock.validate(s)); |
229 |
< |
lock.unlockWrite(s); |
242 |
< |
s = lock.readLock(); |
243 |
< |
assertTrue(lock.validate(s)); |
244 |
< |
lock.unlockRead(s); |
245 |
< |
assertTrue((s = lock.tryWriteLock()) != 0L); |
246 |
< |
assertTrue(lock.validate(s)); |
247 |
< |
lock.unlockWrite(s); |
248 |
< |
assertTrue((s = lock.tryReadLock()) != 0L); |
249 |
< |
assertTrue(lock.validate(s)); |
250 |
< |
lock.unlockRead(s); |
251 |
< |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
224 |
> |
public void testValidate() throws InterruptedException { |
225 |
> |
StampedLock lock = new StampedLock(); |
226 |
> |
|
227 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) |
228 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
229 |
> |
long s = assertNonZero(readLocker.apply(lock)); |
230 |
|
assertTrue(lock.validate(s)); |
231 |
< |
lock.unlockWrite(s); |
232 |
< |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
231 |
> |
readUnlocker.accept(lock, s); |
232 |
> |
} |
233 |
> |
|
234 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
235 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
236 |
> |
long s = assertNonZero(writeLocker.apply(lock)); |
237 |
|
assertTrue(lock.validate(s)); |
238 |
< |
lock.unlockRead(s); |
257 |
< |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
258 |
< |
} catch (InterruptedException ie) { |
259 |
< |
threadUnexpectedException(ie); |
238 |
> |
writeUnlocker.accept(lock, s); |
239 |
|
} |
240 |
|
} |
241 |
|
|
242 |
|
/** |
243 |
|
* A stamp obtained from an unsuccessful lock operation does not validate |
244 |
|
*/ |
245 |
< |
public void testValidate2() { |
246 |
< |
try { |
247 |
< |
StampedLock lock = new StampedLock(); |
248 |
< |
long s; |
249 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
250 |
< |
assertTrue(lock.validate(s)); |
251 |
< |
assertFalse(lock.validate(lock.tryWriteLock())); |
252 |
< |
assertFalse(lock.validate(lock.tryWriteLock(10L, MILLISECONDS))); |
253 |
< |
assertFalse(lock.validate(lock.tryReadLock())); |
254 |
< |
assertFalse(lock.validate(lock.tryReadLock(10L, MILLISECONDS))); |
255 |
< |
assertFalse(lock.validate(lock.tryOptimisticRead())); |
256 |
< |
lock.unlockWrite(s); |
257 |
< |
} catch (InterruptedException ie) { |
258 |
< |
threadUnexpectedException(ie); |
245 |
> |
public void testValidate2() throws InterruptedException { |
246 |
> |
StampedLock lock = new StampedLock(); |
247 |
> |
long s = assertNonZero(lock.writeLock()); |
248 |
> |
assertTrue(lock.validate(s)); |
249 |
> |
assertFalse(lock.validate(lock.tryWriteLock())); |
250 |
> |
assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(), |
251 |
> |
randomTimeUnit()))); |
252 |
> |
assertFalse(lock.validate(lock.tryReadLock())); |
253 |
> |
assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(), |
254 |
> |
randomTimeUnit()))); |
255 |
> |
assertFalse(lock.validate(lock.tryOptimisticRead())); |
256 |
> |
lock.unlockWrite(s); |
257 |
> |
} |
258 |
> |
|
259 |
> |
void assertThrowInterruptedExceptionWhenPreInterrupted(Action[] actions) { |
260 |
> |
for (Action action : actions) { |
261 |
> |
Thread.currentThread().interrupt(); |
262 |
> |
try { |
263 |
> |
action.run(); |
264 |
> |
shouldThrow(); |
265 |
> |
} |
266 |
> |
catch (InterruptedException success) {} |
267 |
> |
catch (Throwable fail) { threadUnexpectedException(fail); } |
268 |
> |
assertFalse(Thread.interrupted()); |
269 |
|
} |
270 |
|
} |
271 |
|
|
272 |
|
/** |
273 |
< |
* writeLockInterruptibly is interruptible |
273 |
> |
* interruptible operations throw InterruptedException when pre-interrupted |
274 |
|
*/ |
275 |
< |
public void testWriteLockInterruptibly_Interruptible() { |
287 |
< |
final CountDownLatch running = new CountDownLatch(1); |
275 |
> |
public void testInterruptibleOperationsThrowInterruptedExceptionWhenPreInterrupted() { |
276 |
|
final StampedLock lock = new StampedLock(); |
277 |
< |
long s = lock.writeLock(); |
278 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
279 |
< |
public void realRun() throws InterruptedException { |
280 |
< |
running.countDown(); |
281 |
< |
lock.writeLockInterruptibly(); |
282 |
< |
}}); |
283 |
< |
try { |
284 |
< |
running.await(); |
285 |
< |
waitForThreadToEnterWaitState(t, 100); |
286 |
< |
t.interrupt(); |
287 |
< |
awaitTermination(t); |
288 |
< |
releaseWriteLock(lock, s); |
289 |
< |
} catch (InterruptedException ie) { |
290 |
< |
threadUnexpectedException(ie); |
277 |
> |
|
278 |
> |
Action[] interruptibleLockActions = { |
279 |
> |
() -> lock.writeLockInterruptibly(), |
280 |
> |
() -> lock.tryWriteLock(Long.MIN_VALUE, DAYS), |
281 |
> |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
282 |
> |
() -> lock.readLockInterruptibly(), |
283 |
> |
() -> lock.tryReadLock(Long.MIN_VALUE, DAYS), |
284 |
> |
() -> lock.tryReadLock(Long.MAX_VALUE, DAYS), |
285 |
> |
() -> lock.asWriteLock().lockInterruptibly(), |
286 |
> |
() -> lock.asWriteLock().tryLock(0L, DAYS), |
287 |
> |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
288 |
> |
() -> lock.asReadLock().lockInterruptibly(), |
289 |
> |
() -> lock.asReadLock().tryLock(0L, DAYS), |
290 |
> |
() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS), |
291 |
> |
}; |
292 |
> |
shuffle(interruptibleLockActions); |
293 |
> |
|
294 |
> |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
295 |
> |
{ |
296 |
> |
long s = lock.writeLock(); |
297 |
> |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
298 |
> |
lock.unlockWrite(s); |
299 |
> |
} |
300 |
> |
{ |
301 |
> |
long s = lock.readLock(); |
302 |
> |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
303 |
> |
lock.unlockRead(s); |
304 |
> |
} |
305 |
> |
} |
306 |
> |
|
307 |
> |
void assertThrowInterruptedExceptionWhenInterrupted(Action[] actions) { |
308 |
> |
int n = actions.length; |
309 |
> |
Future<?>[] futures = new Future<?>[n]; |
310 |
> |
CountDownLatch threadsStarted = new CountDownLatch(n); |
311 |
> |
CountDownLatch done = new CountDownLatch(n); |
312 |
> |
|
313 |
> |
for (int i = 0; i < n; i++) { |
314 |
> |
Action action = actions[i]; |
315 |
> |
futures[i] = cachedThreadPool.submit(new CheckedRunnable() { |
316 |
> |
public void realRun() throws Throwable { |
317 |
> |
threadsStarted.countDown(); |
318 |
> |
try { |
319 |
> |
action.run(); |
320 |
> |
shouldThrow(); |
321 |
> |
} |
322 |
> |
catch (InterruptedException success) {} |
323 |
> |
catch (Throwable fail) { threadUnexpectedException(fail); } |
324 |
> |
assertFalse(Thread.interrupted()); |
325 |
> |
done.countDown(); |
326 |
> |
}}); |
327 |
|
} |
328 |
+ |
|
329 |
+ |
await(threadsStarted); |
330 |
+ |
assertEquals(n, done.getCount()); |
331 |
+ |
for (Future<?> future : futures) // Interrupt all the tasks |
332 |
+ |
future.cancel(true); |
333 |
+ |
await(done); |
334 |
|
} |
335 |
|
|
336 |
|
/** |
337 |
< |
* timed tryWriteLock is interruptible |
337 |
> |
* interruptible operations throw InterruptedException when write locked and interrupted |
338 |
|
*/ |
339 |
< |
public void testWriteTryLock_Interruptible() { |
310 |
< |
final CountDownLatch running = new CountDownLatch(1); |
339 |
> |
public void testInterruptibleOperationsThrowInterruptedExceptionWriteLockedInterrupted() { |
340 |
|
final StampedLock lock = new StampedLock(); |
341 |
|
long s = lock.writeLock(); |
342 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
343 |
< |
public void realRun() throws InterruptedException { |
344 |
< |
running.countDown(); |
345 |
< |
lock.tryWriteLock(2 * LONG_DELAY_MS, MILLISECONDS); |
346 |
< |
}}); |
347 |
< |
try { |
348 |
< |
running.await(); |
349 |
< |
waitForThreadToEnterWaitState(t, 100); |
350 |
< |
t.interrupt(); |
351 |
< |
awaitTermination(t); |
352 |
< |
releaseWriteLock(lock, s); |
353 |
< |
} catch (InterruptedException ie) { |
354 |
< |
threadUnexpectedException(ie); |
355 |
< |
} |
342 |
> |
|
343 |
> |
Action[] interruptibleLockBlockingActions = { |
344 |
> |
() -> lock.writeLockInterruptibly(), |
345 |
> |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
346 |
> |
() -> lock.readLockInterruptibly(), |
347 |
> |
() -> lock.tryReadLock(Long.MAX_VALUE, DAYS), |
348 |
> |
() -> lock.asWriteLock().lockInterruptibly(), |
349 |
> |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
350 |
> |
() -> lock.asReadLock().lockInterruptibly(), |
351 |
> |
() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS), |
352 |
> |
}; |
353 |
> |
shuffle(interruptibleLockBlockingActions); |
354 |
> |
|
355 |
> |
assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions); |
356 |
|
} |
357 |
|
|
358 |
|
/** |
359 |
< |
* readLockInterruptibly is interruptible |
359 |
> |
* interruptible operations throw InterruptedException when read locked and interrupted |
360 |
|
*/ |
361 |
< |
public void testReadLockInterruptibly_Interruptible() { |
333 |
< |
final CountDownLatch running = new CountDownLatch(1); |
361 |
> |
public void testInterruptibleOperationsThrowInterruptedExceptionReadLockedInterrupted() { |
362 |
|
final StampedLock lock = new StampedLock(); |
363 |
< |
long s = lock.writeLock(); |
364 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
365 |
< |
public void realRun() throws InterruptedException { |
366 |
< |
running.countDown(); |
367 |
< |
lock.readLockInterruptibly(); |
368 |
< |
}}); |
369 |
< |
try { |
370 |
< |
running.await(); |
371 |
< |
waitForThreadToEnterWaitState(t, 100); |
372 |
< |
t.interrupt(); |
373 |
< |
awaitTermination(t); |
346 |
< |
releaseWriteLock(lock, s); |
347 |
< |
} catch (InterruptedException ie) { |
348 |
< |
threadUnexpectedException(ie); |
349 |
< |
} |
363 |
> |
long s = lock.readLock(); |
364 |
> |
|
365 |
> |
Action[] interruptibleLockBlockingActions = { |
366 |
> |
() -> lock.writeLockInterruptibly(), |
367 |
> |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
368 |
> |
() -> lock.asWriteLock().lockInterruptibly(), |
369 |
> |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
370 |
> |
}; |
371 |
> |
shuffle(interruptibleLockBlockingActions); |
372 |
> |
|
373 |
> |
assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions); |
374 |
|
} |
375 |
|
|
376 |
|
/** |
377 |
< |
* timed tryReadLock is interruptible |
377 |
> |
* Non-interruptible operations ignore and preserve interrupt status |
378 |
|
*/ |
379 |
< |
public void testReadTryLock_Interruptible() { |
356 |
< |
final CountDownLatch running = new CountDownLatch(1); |
379 |
> |
public void testNonInterruptibleOperationsIgnoreInterrupts() { |
380 |
|
final StampedLock lock = new StampedLock(); |
381 |
< |
long s = lock.writeLock(); |
382 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
383 |
< |
public void realRun() throws InterruptedException { |
384 |
< |
running.countDown(); |
385 |
< |
lock.tryReadLock(2 * LONG_DELAY_MS, MILLISECONDS); |
386 |
< |
}}); |
387 |
< |
try { |
388 |
< |
running.await(); |
389 |
< |
waitForThreadToEnterWaitState(t, 100); |
390 |
< |
t.interrupt(); |
391 |
< |
awaitTermination(t); |
392 |
< |
releaseWriteLock(lock, s); |
393 |
< |
} catch (InterruptedException ie) { |
394 |
< |
threadUnexpectedException(ie); |
381 |
> |
Thread.currentThread().interrupt(); |
382 |
> |
|
383 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
384 |
> |
long s = assertValid(lock, lock.readLock()); |
385 |
> |
readUnlocker.accept(lock, s); |
386 |
> |
s = assertValid(lock, lock.tryReadLock()); |
387 |
> |
readUnlocker.accept(lock, s); |
388 |
> |
} |
389 |
> |
|
390 |
> |
lock.asReadLock().lock(); |
391 |
> |
lock.asReadLock().unlock(); |
392 |
> |
|
393 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
394 |
> |
long s = assertValid(lock, lock.writeLock()); |
395 |
> |
writeUnlocker.accept(lock, s); |
396 |
> |
s = assertValid(lock, lock.tryWriteLock()); |
397 |
> |
writeUnlocker.accept(lock, s); |
398 |
|
} |
399 |
+ |
|
400 |
+ |
lock.asWriteLock().lock(); |
401 |
+ |
lock.asWriteLock().unlock(); |
402 |
+ |
|
403 |
+ |
assertTrue(Thread.interrupted()); |
404 |
|
} |
405 |
|
|
406 |
|
/** |
407 |
|
* tryWriteLock on an unlocked lock succeeds |
408 |
|
*/ |
409 |
< |
public void testWriteTryLock() { |
409 |
> |
public void testTryWriteLock() { |
410 |
|
final StampedLock lock = new StampedLock(); |
411 |
|
long s = lock.tryWriteLock(); |
412 |
|
assertTrue(s != 0L); |
413 |
|
assertTrue(lock.isWriteLocked()); |
414 |
< |
long s2 = lock.tryWriteLock(); |
384 |
< |
assertEquals(s2, 0L); |
414 |
> |
assertEquals(0L, lock.tryWriteLock()); |
415 |
|
releaseWriteLock(lock, s); |
416 |
|
} |
417 |
|
|
418 |
|
/** |
419 |
|
* tryWriteLock fails if locked |
420 |
|
*/ |
421 |
< |
public void testWriteTryLockWhenLocked() { |
421 |
> |
public void testTryWriteLockWhenLocked() { |
422 |
|
final StampedLock lock = new StampedLock(); |
423 |
|
long s = lock.writeLock(); |
424 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
425 |
|
public void realRun() { |
426 |
< |
long ws = lock.tryWriteLock(); |
397 |
< |
assertTrue(ws == 0L); |
426 |
> |
assertEquals(0L, lock.tryWriteLock()); |
427 |
|
}}); |
428 |
|
|
429 |
+ |
assertEquals(0L, lock.tryWriteLock()); |
430 |
|
awaitTermination(t); |
431 |
|
releaseWriteLock(lock, s); |
432 |
|
} |
434 |
|
/** |
435 |
|
* tryReadLock fails if write-locked |
436 |
|
*/ |
437 |
< |
public void testReadTryLockWhenLocked() { |
437 |
> |
public void testTryReadLockWhenLocked() { |
438 |
|
final StampedLock lock = new StampedLock(); |
439 |
|
long s = lock.writeLock(); |
440 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
441 |
|
public void realRun() { |
442 |
< |
long rs = lock.tryReadLock(); |
413 |
< |
assertEquals(rs, 0L); |
442 |
> |
assertEquals(0L, lock.tryReadLock()); |
443 |
|
}}); |
444 |
|
|
445 |
+ |
assertEquals(0L, lock.tryReadLock()); |
446 |
|
awaitTermination(t); |
447 |
|
releaseWriteLock(lock, s); |
448 |
|
} |
456 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
457 |
|
public void realRun() throws InterruptedException { |
458 |
|
long s2 = lock.tryReadLock(); |
459 |
< |
assertTrue(s2 != 0L); |
459 |
> |
assertValid(lock, s2); |
460 |
|
lock.unlockRead(s2); |
461 |
|
long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS); |
462 |
< |
assertTrue(s3 != 0L); |
462 |
> |
assertValid(lock, s3); |
463 |
|
lock.unlockRead(s3); |
464 |
|
long s4 = lock.readLock(); |
465 |
+ |
assertValid(lock, s4); |
466 |
|
lock.unlockRead(s4); |
467 |
+ |
lock.asReadLock().lock(); |
468 |
+ |
lock.asReadLock().unlock(); |
469 |
+ |
lock.asReadLock().lockInterruptibly(); |
470 |
+ |
lock.asReadLock().unlock(); |
471 |
+ |
lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS); |
472 |
+ |
lock.asReadLock().unlock(); |
473 |
|
}}); |
474 |
|
|
475 |
|
awaitTermination(t); |
477 |
|
} |
478 |
|
|
479 |
|
/** |
480 |
< |
* A writelock succeeds only after a reading thread unlocks |
480 |
> |
* writeLock() succeeds only after a reading thread unlocks |
481 |
|
*/ |
482 |
< |
public void testWriteAfterReadLock() { |
483 |
< |
final CountDownLatch running = new CountDownLatch(1); |
482 |
> |
public void testWriteAfterReadLock() throws InterruptedException { |
483 |
> |
final CountDownLatch aboutToLock = new CountDownLatch(1); |
484 |
|
final StampedLock lock = new StampedLock(); |
485 |
|
long rs = lock.readLock(); |
486 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
487 |
|
public void realRun() { |
488 |
< |
running.countDown(); |
488 |
> |
aboutToLock.countDown(); |
489 |
|
long s = lock.writeLock(); |
490 |
+ |
assertTrue(lock.isWriteLocked()); |
491 |
+ |
assertFalse(lock.isReadLocked()); |
492 |
|
lock.unlockWrite(s); |
493 |
|
}}); |
494 |
< |
try { |
495 |
< |
running.await(); |
496 |
< |
waitForThreadToEnterWaitState(t, 100); |
497 |
< |
assertFalse(lock.isWriteLocked()); |
498 |
< |
lock.unlockRead(rs); |
499 |
< |
awaitTermination(t); |
500 |
< |
assertFalse(lock.isWriteLocked()); |
501 |
< |
} catch (InterruptedException ie) { |
463 |
< |
threadUnexpectedException(ie); |
464 |
< |
} |
494 |
> |
|
495 |
> |
await(aboutToLock); |
496 |
> |
assertThreadBlocks(t, Thread.State.WAITING); |
497 |
> |
assertFalse(lock.isWriteLocked()); |
498 |
> |
assertTrue(lock.isReadLocked()); |
499 |
> |
lock.unlockRead(rs); |
500 |
> |
awaitTermination(t); |
501 |
> |
assertUnlocked(lock); |
502 |
|
} |
503 |
|
|
504 |
|
/** |
505 |
< |
* A writelock succeeds only after reading threads unlock |
505 |
> |
* writeLock() succeeds only after reading threads unlock |
506 |
|
*/ |
507 |
|
public void testWriteAfterMultipleReadLocks() { |
508 |
|
final StampedLock lock = new StampedLock(); |
512 |
|
long rs = lock.readLock(); |
513 |
|
lock.unlockRead(rs); |
514 |
|
}}); |
515 |
+ |
|
516 |
|
awaitTermination(t1); |
517 |
|
|
518 |
|
Thread t2 = newStartedThread(new CheckedRunnable() { |
520 |
|
long ws = lock.writeLock(); |
521 |
|
lock.unlockWrite(ws); |
522 |
|
}}); |
523 |
+ |
|
524 |
+ |
assertTrue(lock.isReadLocked()); |
525 |
|
assertFalse(lock.isWriteLocked()); |
526 |
|
lock.unlockRead(s); |
527 |
|
awaitTermination(t2); |
528 |
< |
assertFalse(lock.isWriteLocked()); |
528 |
> |
assertUnlocked(lock); |
529 |
|
} |
530 |
|
|
531 |
|
/** |
532 |
< |
* Readlocks succeed only after a writing thread unlocks |
532 |
> |
* readLock() succeed only after a writing thread unlocks |
533 |
|
*/ |
534 |
|
public void testReadAfterWriteLock() { |
535 |
|
final StampedLock lock = new StampedLock(); |
536 |
+ |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
537 |
|
final long s = lock.writeLock(); |
538 |
< |
Thread t1 = newStartedThread(new CheckedRunnable() { |
498 |
< |
public void realRun() { |
499 |
< |
long rs = lock.readLock(); |
500 |
< |
lock.unlockRead(rs); |
501 |
< |
}}); |
502 |
< |
Thread t2 = newStartedThread(new CheckedRunnable() { |
538 |
> |
final Runnable acquireReleaseReadLock = new CheckedRunnable() { |
539 |
|
public void realRun() { |
540 |
+ |
threadsStarted.countDown(); |
541 |
|
long rs = lock.readLock(); |
542 |
+ |
assertTrue(lock.isReadLocked()); |
543 |
+ |
assertFalse(lock.isWriteLocked()); |
544 |
|
lock.unlockRead(rs); |
545 |
< |
}}); |
546 |
< |
|
545 |
> |
}}; |
546 |
> |
Thread t1 = newStartedThread(acquireReleaseReadLock); |
547 |
> |
Thread t2 = newStartedThread(acquireReleaseReadLock); |
548 |
> |
|
549 |
> |
await(threadsStarted); |
550 |
> |
assertThreadBlocks(t1, Thread.State.WAITING); |
551 |
> |
assertThreadBlocks(t2, Thread.State.WAITING); |
552 |
> |
assertTrue(lock.isWriteLocked()); |
553 |
> |
assertFalse(lock.isReadLocked()); |
554 |
|
releaseWriteLock(lock, s); |
555 |
|
awaitTermination(t1); |
556 |
|
awaitTermination(t2); |
557 |
+ |
assertUnlocked(lock); |
558 |
|
} |
559 |
|
|
560 |
|
/** |
561 |
< |
* tryReadLock succeeds if readlocked but not writelocked |
561 |
> |
* tryReadLock succeeds if read locked but not write locked |
562 |
|
*/ |
563 |
|
public void testTryLockWhenReadLocked() { |
564 |
|
final StampedLock lock = new StampedLock(); |
566 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
567 |
|
public void realRun() { |
568 |
|
long rs = lock.tryReadLock(); |
569 |
< |
threadAssertTrue(rs != 0L); |
569 |
> |
assertValid(lock, rs); |
570 |
|
lock.unlockRead(rs); |
571 |
|
}}); |
572 |
|
|
575 |
|
} |
576 |
|
|
577 |
|
/** |
578 |
< |
* tryWriteLock fails when readlocked |
578 |
> |
* tryWriteLock fails when read locked |
579 |
|
*/ |
580 |
< |
public void testWriteTryLockWhenReadLocked() { |
580 |
> |
public void testTryWriteLockWhenReadLocked() { |
581 |
|
final StampedLock lock = new StampedLock(); |
582 |
|
long s = lock.readLock(); |
583 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
584 |
|
public void realRun() { |
585 |
< |
long ws = lock.tryWriteLock(); |
539 |
< |
threadAssertEquals(ws, 0L); |
585 |
> |
threadAssertEquals(0L, lock.tryWriteLock()); |
586 |
|
}}); |
587 |
|
|
588 |
|
awaitTermination(t); |
590 |
|
} |
591 |
|
|
592 |
|
/** |
593 |
< |
* timed tryWriteLock times out if locked |
593 |
> |
* timed lock operations time out if lock not available |
594 |
|
*/ |
595 |
< |
public void testWriteTryLock_Timeout() { |
595 |
> |
public void testTimedLock_Timeout() throws Exception { |
596 |
> |
ArrayList<Future<?>> futures = new ArrayList<>(); |
597 |
> |
|
598 |
> |
// Write locked |
599 |
|
final StampedLock lock = new StampedLock(); |
600 |
< |
long s = lock.writeLock(); |
601 |
< |
Thread t = newStartedThread(new CheckedRunnable() { |
600 |
> |
long stamp = lock.writeLock(); |
601 |
> |
assertEquals(0L, lock.tryReadLock(0L, DAYS)); |
602 |
> |
assertEquals(0L, lock.tryReadLock(Long.MIN_VALUE, DAYS)); |
603 |
> |
assertFalse(lock.asReadLock().tryLock(0L, DAYS)); |
604 |
> |
assertFalse(lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS)); |
605 |
> |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
606 |
> |
assertEquals(0L, lock.tryWriteLock(Long.MIN_VALUE, DAYS)); |
607 |
> |
assertFalse(lock.asWriteLock().tryLock(0L, DAYS)); |
608 |
> |
assertFalse(lock.asWriteLock().tryLock(Long.MIN_VALUE, DAYS)); |
609 |
> |
|
610 |
> |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
611 |
|
public void realRun() throws InterruptedException { |
612 |
|
long startTime = System.nanoTime(); |
613 |
< |
long timeoutMillis = 10; |
614 |
< |
long ws = lock.tryWriteLock(timeoutMillis, MILLISECONDS); |
615 |
< |
assertEquals(ws, 0L); |
558 |
< |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
559 |
< |
}}); |
613 |
> |
assertEquals(0L, lock.tryWriteLock(timeoutMillis(), MILLISECONDS)); |
614 |
> |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
615 |
> |
}})); |
616 |
|
|
617 |
< |
awaitTermination(t); |
618 |
< |
releaseWriteLock(lock, s); |
619 |
< |
} |
617 |
> |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
618 |
> |
public void realRun() throws InterruptedException { |
619 |
> |
long startTime = System.nanoTime(); |
620 |
> |
assertEquals(0L, lock.tryReadLock(timeoutMillis(), MILLISECONDS)); |
621 |
> |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
622 |
> |
}})); |
623 |
> |
|
624 |
> |
// Read locked |
625 |
> |
final StampedLock lock2 = new StampedLock(); |
626 |
> |
long stamp2 = lock2.readLock(); |
627 |
> |
assertEquals(0L, lock2.tryWriteLock(0L, DAYS)); |
628 |
> |
assertEquals(0L, lock2.tryWriteLock(Long.MIN_VALUE, DAYS)); |
629 |
> |
assertFalse(lock2.asWriteLock().tryLock(0L, DAYS)); |
630 |
> |
assertFalse(lock2.asWriteLock().tryLock(Long.MIN_VALUE, DAYS)); |
631 |
|
|
632 |
< |
/** |
566 |
< |
* timed tryReadLock times out if write-locked |
567 |
< |
*/ |
568 |
< |
public void testReadTryLock_Timeout() { |
569 |
< |
final StampedLock lock = new StampedLock(); |
570 |
< |
long s = lock.writeLock(); |
571 |
< |
Thread t = newStartedThread(new CheckedRunnable() { |
632 |
> |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
633 |
|
public void realRun() throws InterruptedException { |
634 |
|
long startTime = System.nanoTime(); |
635 |
< |
long timeoutMillis = 10; |
636 |
< |
long rs = lock.tryReadLock(timeoutMillis, MILLISECONDS); |
637 |
< |
assertEquals(rs, 0L); |
577 |
< |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
578 |
< |
}}); |
635 |
> |
assertEquals(0L, lock2.tryWriteLock(timeoutMillis(), MILLISECONDS)); |
636 |
> |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
637 |
> |
}})); |
638 |
|
|
639 |
< |
awaitTermination(t); |
640 |
< |
assertTrue(lock.isWriteLocked()); |
641 |
< |
lock.unlockWrite(s); |
639 |
> |
for (Future<?> future : futures) |
640 |
> |
assertNull(future.get()); |
641 |
> |
|
642 |
> |
releaseWriteLock(lock, stamp); |
643 |
> |
releaseReadLock(lock2, stamp2); |
644 |
|
} |
645 |
|
|
646 |
|
/** |
647 |
< |
* writeLockInterruptibly succeeds if unlocked, else is interruptible |
647 |
> |
* writeLockInterruptibly succeeds if unlocked |
648 |
|
*/ |
649 |
< |
public void testWriteLockInterruptibly() { |
589 |
< |
final CountDownLatch running = new CountDownLatch(1); |
649 |
> |
public void testWriteLockInterruptibly() throws InterruptedException { |
650 |
|
final StampedLock lock = new StampedLock(); |
651 |
< |
long s = 0L; |
652 |
< |
try { |
653 |
< |
s = lock.writeLockInterruptibly(); |
594 |
< |
} catch (InterruptedException ie) { |
595 |
< |
threadUnexpectedException(ie); |
596 |
< |
} |
597 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
598 |
< |
public void realRun() throws InterruptedException { |
599 |
< |
running.countDown(); |
600 |
< |
lock.writeLockInterruptibly(); |
601 |
< |
}}); |
602 |
< |
|
603 |
< |
try { |
604 |
< |
running.await(); |
605 |
< |
waitForThreadToEnterWaitState(t, 100); |
606 |
< |
t.interrupt(); |
607 |
< |
assertTrue(lock.isWriteLocked()); |
608 |
< |
awaitTermination(t); |
609 |
< |
releaseWriteLock(lock, s); |
610 |
< |
} catch (InterruptedException ie) { |
611 |
< |
threadUnexpectedException(ie); |
612 |
< |
} |
613 |
< |
|
651 |
> |
long s = lock.writeLockInterruptibly(); |
652 |
> |
assertTrue(lock.isWriteLocked()); |
653 |
> |
releaseWriteLock(lock, s); |
654 |
|
} |
655 |
|
|
656 |
|
/** |
657 |
< |
* readLockInterruptibly succeeds if lock free else is interruptible |
657 |
> |
* readLockInterruptibly succeeds if lock free |
658 |
|
*/ |
659 |
< |
public void testReadLockInterruptibly() { |
620 |
< |
final CountDownLatch running = new CountDownLatch(1); |
659 |
> |
public void testReadLockInterruptibly() throws InterruptedException { |
660 |
|
final StampedLock lock = new StampedLock(); |
661 |
< |
long s = 0L; |
662 |
< |
try { |
663 |
< |
s = lock.readLockInterruptibly(); |
664 |
< |
lock.unlockRead(s); |
665 |
< |
s = lock.writeLockInterruptibly(); |
666 |
< |
} catch (InterruptedException ie) { |
667 |
< |
threadUnexpectedException(ie); |
668 |
< |
} |
630 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
631 |
< |
public void realRun() throws InterruptedException { |
632 |
< |
running.countDown(); |
633 |
< |
lock.readLockInterruptibly(); |
634 |
< |
}}); |
635 |
< |
try { |
636 |
< |
running.await(); |
637 |
< |
waitForThreadToEnterWaitState(t, 100); |
638 |
< |
t.interrupt(); |
639 |
< |
awaitTermination(t); |
640 |
< |
releaseWriteLock(lock, s); |
641 |
< |
} catch (InterruptedException ie) { |
642 |
< |
threadUnexpectedException(ie); |
643 |
< |
} |
661 |
> |
|
662 |
> |
long s = assertValid(lock, lock.readLockInterruptibly()); |
663 |
> |
assertTrue(lock.isReadLocked()); |
664 |
> |
lock.unlockRead(s); |
665 |
> |
|
666 |
> |
lock.asReadLock().lockInterruptibly(); |
667 |
> |
assertTrue(lock.isReadLocked()); |
668 |
> |
lock.asReadLock().unlock(); |
669 |
|
} |
670 |
|
|
671 |
|
/** |
697 |
|
} |
698 |
|
|
699 |
|
/** |
700 |
< |
* tryOptimisticRead succeeds and validates if unlocked, fails if locked |
700 |
> |
* tryOptimisticRead succeeds and validates if unlocked, fails if |
701 |
> |
* exclusively locked |
702 |
|
*/ |
703 |
< |
public void testValidateOptimistic() { |
704 |
< |
try { |
705 |
< |
StampedLock lock = new StampedLock(); |
706 |
< |
long s, p; |
707 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
708 |
< |
assertTrue(lock.validate(p)); |
709 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
710 |
< |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
711 |
< |
assertTrue(lock.validate(s)); |
712 |
< |
lock.unlockWrite(s); |
713 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
714 |
< |
assertTrue(lock.validate(p)); |
715 |
< |
assertTrue((s = lock.readLock()) != 0L); |
716 |
< |
assertTrue(lock.validate(s)); |
717 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
692 |
< |
assertTrue(lock.validate(p)); |
693 |
< |
lock.unlockRead(s); |
694 |
< |
assertTrue((s = lock.tryWriteLock()) != 0L); |
695 |
< |
assertTrue(lock.validate(s)); |
696 |
< |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
697 |
< |
lock.unlockWrite(s); |
698 |
< |
assertTrue((s = lock.tryReadLock()) != 0L); |
699 |
< |
assertTrue(lock.validate(s)); |
700 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
701 |
< |
lock.unlockRead(s); |
703 |
> |
public void testValidateOptimistic() throws InterruptedException { |
704 |
> |
StampedLock lock = new StampedLock(); |
705 |
> |
|
706 |
> |
assertValid(lock, lock.tryOptimisticRead()); |
707 |
> |
|
708 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
709 |
> |
long s = assertValid(lock, writeLocker.apply(lock)); |
710 |
> |
assertEquals(0L, lock.tryOptimisticRead()); |
711 |
> |
releaseWriteLock(lock, s); |
712 |
> |
} |
713 |
> |
|
714 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
715 |
> |
long s = assertValid(lock, readLocker.apply(lock)); |
716 |
> |
long p = assertValid(lock, lock.tryOptimisticRead()); |
717 |
> |
releaseReadLock(lock, s); |
718 |
|
assertTrue(lock.validate(p)); |
703 |
– |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
704 |
– |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
705 |
– |
assertTrue(lock.validate(s)); |
706 |
– |
lock.unlockWrite(s); |
707 |
– |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
708 |
– |
assertTrue(lock.validate(s)); |
709 |
– |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
710 |
– |
lock.unlockRead(s); |
711 |
– |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
712 |
– |
} catch (InterruptedException ie) { |
713 |
– |
threadUnexpectedException(ie); |
719 |
|
} |
720 |
+ |
|
721 |
+ |
assertValid(lock, lock.tryOptimisticRead()); |
722 |
|
} |
723 |
|
|
724 |
|
/** |
725 |
|
* tryOptimisticRead stamp does not validate if a write lock intervenes |
726 |
|
*/ |
727 |
|
public void testValidateOptimisticWriteLocked() { |
728 |
< |
StampedLock lock = new StampedLock(); |
729 |
< |
long s, p; |
730 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
724 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
728 |
> |
final StampedLock lock = new StampedLock(); |
729 |
> |
final long p = assertValid(lock, lock.tryOptimisticRead()); |
730 |
> |
final long s = assertValid(lock, lock.writeLock()); |
731 |
|
assertFalse(lock.validate(p)); |
732 |
< |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
732 |
> |
assertEquals(0L, lock.tryOptimisticRead()); |
733 |
|
assertTrue(lock.validate(s)); |
734 |
|
lock.unlockWrite(s); |
735 |
|
} |
738 |
|
* tryOptimisticRead stamp does not validate if a write lock |
739 |
|
* intervenes in another thread |
740 |
|
*/ |
741 |
< |
public void testValidateOptimisticWriteLocked2() { |
742 |
< |
final CountDownLatch running = new CountDownLatch(1); |
741 |
> |
public void testValidateOptimisticWriteLocked2() |
742 |
> |
throws InterruptedException { |
743 |
> |
final CountDownLatch locked = new CountDownLatch(1); |
744 |
|
final StampedLock lock = new StampedLock(); |
745 |
< |
long s, p; |
746 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
745 |
> |
final long p = assertValid(lock, lock.tryOptimisticRead()); |
746 |
> |
|
747 |
|
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
748 |
< |
public void realRun() throws InterruptedException { |
749 |
< |
lock.writeLockInterruptibly(); |
750 |
< |
running.countDown(); |
751 |
< |
lock.writeLockInterruptibly(); |
752 |
< |
}}); |
753 |
< |
try { |
754 |
< |
running.await(); |
755 |
< |
assertFalse(lock.validate(p)); |
756 |
< |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
757 |
< |
t.interrupt(); |
758 |
< |
awaitTermination(t); |
759 |
< |
} catch (InterruptedException ie) { |
760 |
< |
threadUnexpectedException(ie); |
754 |
< |
} |
748 |
> |
public void realRun() throws InterruptedException { |
749 |
> |
lock.writeLockInterruptibly(); |
750 |
> |
locked.countDown(); |
751 |
> |
lock.writeLockInterruptibly(); |
752 |
> |
}}); |
753 |
> |
|
754 |
> |
await(locked); |
755 |
> |
assertFalse(lock.validate(p)); |
756 |
> |
assertEquals(0L, lock.tryOptimisticRead()); |
757 |
> |
assertThreadBlocks(t, Thread.State.WAITING); |
758 |
> |
t.interrupt(); |
759 |
> |
awaitTermination(t); |
760 |
> |
assertTrue(lock.isWriteLocked()); |
761 |
|
} |
762 |
|
|
763 |
|
/** |
764 |
< |
* tryConvertToOptimisticRead succeeds and validates if successfully locked, |
764 |
> |
* tryConvertToOptimisticRead succeeds and validates if successfully locked |
765 |
|
*/ |
766 |
< |
public void testTryConvertToOptimisticRead() { |
767 |
< |
try { |
768 |
< |
StampedLock lock = new StampedLock(); |
769 |
< |
long s, p; |
770 |
< |
s = 0L; |
771 |
< |
assertFalse((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
772 |
< |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
773 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
774 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
775 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
776 |
< |
assertTrue(lock.validate(p)); |
777 |
< |
assertTrue((s = lock.readLock()) != 0L); |
778 |
< |
assertTrue(lock.validate(s)); |
773 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
774 |
< |
assertTrue(lock.validate(p)); |
775 |
< |
assertTrue((s = lock.tryWriteLock()) != 0L); |
776 |
< |
assertTrue(lock.validate(s)); |
777 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
778 |
< |
assertTrue(lock.validate(p)); |
779 |
< |
assertTrue((s = lock.tryReadLock()) != 0L); |
780 |
< |
assertTrue(lock.validate(s)); |
781 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
766 |
> |
public void testTryConvertToOptimisticRead() throws InterruptedException { |
767 |
> |
StampedLock lock = new StampedLock(); |
768 |
> |
long s, p, q; |
769 |
> |
assertEquals(0L, lock.tryConvertToOptimisticRead(0L)); |
770 |
> |
|
771 |
> |
s = assertValid(lock, lock.tryOptimisticRead()); |
772 |
> |
assertEquals(s, lock.tryConvertToOptimisticRead(s)); |
773 |
> |
assertTrue(lock.validate(s)); |
774 |
> |
|
775 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
776 |
> |
s = assertValid(lock, writeLocker.apply(lock)); |
777 |
> |
p = assertValid(lock, lock.tryConvertToOptimisticRead(s)); |
778 |
> |
assertFalse(lock.validate(s)); |
779 |
|
assertTrue(lock.validate(p)); |
780 |
< |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
781 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
780 |
> |
assertUnlocked(lock); |
781 |
> |
} |
782 |
> |
|
783 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
784 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
785 |
> |
q = assertValid(lock, lock.tryOptimisticRead()); |
786 |
> |
assertEquals(q, lock.tryConvertToOptimisticRead(q)); |
787 |
> |
assertTrue(lock.validate(q)); |
788 |
> |
assertTrue(lock.isReadLocked()); |
789 |
> |
p = assertValid(lock, lock.tryConvertToOptimisticRead(s)); |
790 |
|
assertTrue(lock.validate(p)); |
786 |
– |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
791 |
|
assertTrue(lock.validate(s)); |
792 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
793 |
< |
assertTrue(lock.validate(p)); |
794 |
< |
} catch (InterruptedException ie) { |
791 |
< |
threadUnexpectedException(ie); |
792 |
> |
assertUnlocked(lock); |
793 |
> |
assertEquals(q, lock.tryConvertToOptimisticRead(q)); |
794 |
> |
assertTrue(lock.validate(q)); |
795 |
|
} |
796 |
|
} |
797 |
|
|
798 |
|
/** |
799 |
< |
* tryConvertToReadLock succeeds and validates if successfully locked |
797 |
< |
* or lock free; |
799 |
> |
* tryConvertToReadLock succeeds for valid stamps |
800 |
|
*/ |
801 |
< |
public void testTryConvertToReadLock() { |
802 |
< |
try { |
803 |
< |
StampedLock lock = new StampedLock(); |
804 |
< |
long s, p; |
805 |
< |
s = 0L; |
806 |
< |
assertFalse((p = lock.tryConvertToReadLock(s)) != 0L); |
807 |
< |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
808 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
809 |
< |
lock.unlockRead(p); |
810 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
811 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
812 |
< |
assertTrue(lock.validate(p)); |
813 |
< |
lock.unlockRead(p); |
814 |
< |
assertTrue((s = lock.readLock()) != 0L); |
815 |
< |
assertTrue(lock.validate(s)); |
816 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
817 |
< |
assertTrue(lock.validate(p)); |
818 |
< |
lock.unlockRead(p); |
819 |
< |
assertTrue((s = lock.tryWriteLock()) != 0L); |
820 |
< |
assertTrue(lock.validate(s)); |
821 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
822 |
< |
assertTrue(lock.validate(p)); |
823 |
< |
lock.unlockRead(p); |
824 |
< |
assertTrue((s = lock.tryReadLock()) != 0L); |
825 |
< |
assertTrue(lock.validate(s)); |
826 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
827 |
< |
assertTrue(lock.validate(p)); |
828 |
< |
lock.unlockRead(p); |
829 |
< |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
830 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
831 |
< |
assertTrue(lock.validate(p)); |
832 |
< |
lock.unlockRead(p); |
833 |
< |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
834 |
< |
assertTrue(lock.validate(s)); |
835 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
836 |
< |
assertTrue(lock.validate(p)); |
837 |
< |
lock.unlockRead(p); |
838 |
< |
} catch (InterruptedException ie) { |
839 |
< |
threadUnexpectedException(ie); |
801 |
> |
public void testTryConvertToReadLock() throws InterruptedException { |
802 |
> |
StampedLock lock = new StampedLock(); |
803 |
> |
long s, p; |
804 |
> |
|
805 |
> |
assertEquals(0L, lock.tryConvertToReadLock(0L)); |
806 |
> |
|
807 |
> |
s = assertValid(lock, lock.tryOptimisticRead()); |
808 |
> |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
809 |
> |
assertTrue(lock.isReadLocked()); |
810 |
> |
assertEquals(1, lock.getReadLockCount()); |
811 |
> |
assertTrue(lock.validate(s)); |
812 |
> |
lock.unlockRead(p); |
813 |
> |
|
814 |
> |
s = assertValid(lock, lock.tryOptimisticRead()); |
815 |
> |
lock.readLock(); |
816 |
> |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
817 |
> |
assertTrue(lock.isReadLocked()); |
818 |
> |
assertEquals(2, lock.getReadLockCount()); |
819 |
> |
lock.unlockRead(p); |
820 |
> |
lock.unlockRead(p); |
821 |
> |
assertUnlocked(lock); |
822 |
> |
|
823 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
824 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
825 |
> |
s = assertValid(lock, writeLocker.apply(lock)); |
826 |
> |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
827 |
> |
assertFalse(lock.validate(s)); |
828 |
> |
assertTrue(lock.isReadLocked()); |
829 |
> |
assertEquals(1, lock.getReadLockCount()); |
830 |
> |
readUnlocker.accept(lock, p); |
831 |
> |
} |
832 |
> |
|
833 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
834 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
835 |
> |
assertEquals(s, lock.tryConvertToReadLock(s)); |
836 |
> |
assertTrue(lock.validate(s)); |
837 |
> |
assertTrue(lock.isReadLocked()); |
838 |
> |
assertEquals(1, lock.getReadLockCount()); |
839 |
> |
readUnlocker.accept(lock, s); |
840 |
> |
} |
841 |
|
} |
842 |
|
} |
843 |
|
|
844 |
|
/** |
845 |
< |
* tryConvertToWriteLock succeeds and validates if successfully locked |
843 |
< |
* or lock free; |
845 |
> |
* tryConvertToWriteLock succeeds if lock available; fails if multiply read locked |
846 |
|
*/ |
847 |
< |
public void testTryConvertToWriteLock() { |
848 |
< |
try { |
849 |
< |
StampedLock lock = new StampedLock(); |
850 |
< |
long s, p; |
851 |
< |
s = 0L; |
852 |
< |
assertFalse((p = lock.tryConvertToWriteLock(s)) != 0L); |
853 |
< |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
854 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
855 |
< |
lock.unlockWrite(p); |
856 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
857 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
858 |
< |
assertTrue(lock.validate(p)); |
859 |
< |
lock.unlockWrite(p); |
860 |
< |
assertTrue((s = lock.readLock()) != 0L); |
861 |
< |
assertTrue(lock.validate(s)); |
862 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
863 |
< |
assertTrue(lock.validate(p)); |
864 |
< |
lock.unlockWrite(p); |
865 |
< |
assertTrue((s = lock.tryWriteLock()) != 0L); |
866 |
< |
assertTrue(lock.validate(s)); |
867 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
868 |
< |
assertTrue(lock.validate(p)); |
869 |
< |
lock.unlockWrite(p); |
870 |
< |
assertTrue((s = lock.tryReadLock()) != 0L); |
871 |
< |
assertTrue(lock.validate(s)); |
872 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
873 |
< |
assertTrue(lock.validate(p)); |
874 |
< |
lock.unlockWrite(p); |
875 |
< |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
876 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
877 |
< |
assertTrue(lock.validate(p)); |
878 |
< |
lock.unlockWrite(p); |
879 |
< |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
847 |
> |
public void testTryConvertToWriteLock() throws InterruptedException { |
848 |
> |
StampedLock lock = new StampedLock(); |
849 |
> |
long s, p; |
850 |
> |
|
851 |
> |
assertEquals(0L, lock.tryConvertToWriteLock(0L)); |
852 |
> |
|
853 |
> |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
854 |
> |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
855 |
> |
assertTrue(lock.isWriteLocked()); |
856 |
> |
lock.unlockWrite(p); |
857 |
> |
|
858 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
859 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
860 |
> |
s = assertValid(lock, writeLocker.apply(lock)); |
861 |
> |
assertEquals(s, lock.tryConvertToWriteLock(s)); |
862 |
> |
assertTrue(lock.validate(s)); |
863 |
> |
assertTrue(lock.isWriteLocked()); |
864 |
> |
writeUnlocker.accept(lock, s); |
865 |
> |
} |
866 |
> |
|
867 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
868 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
869 |
> |
p = assertValid(lock, lock.tryConvertToWriteLock(s)); |
870 |
> |
assertFalse(lock.validate(s)); |
871 |
> |
assertTrue(lock.validate(p)); |
872 |
> |
assertTrue(lock.isWriteLocked()); |
873 |
> |
writeUnlocker.accept(lock, p); |
874 |
> |
} |
875 |
> |
} |
876 |
> |
|
877 |
> |
// failure if multiply read locked |
878 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
879 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
880 |
> |
p = assertValid(lock, readLocker.apply(lock)); |
881 |
> |
assertEquals(0L, lock.tryConvertToWriteLock(s)); |
882 |
|
assertTrue(lock.validate(s)); |
879 |
– |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
883 |
|
assertTrue(lock.validate(p)); |
884 |
< |
lock.unlockWrite(p); |
885 |
< |
} catch (InterruptedException ie) { |
886 |
< |
threadUnexpectedException(ie); |
884 |
> |
assertEquals(2, lock.getReadLockCount()); |
885 |
> |
lock.unlock(p); |
886 |
> |
lock.unlock(s); |
887 |
> |
assertUnlocked(lock); |
888 |
|
} |
889 |
|
} |
890 |
|
|
891 |
|
/** |
892 |
|
* asWriteLock can be locked and unlocked |
893 |
|
*/ |
894 |
< |
public void testAsWriteLock() { |
894 |
> |
public void testAsWriteLock() throws Throwable { |
895 |
|
StampedLock sl = new StampedLock(); |
896 |
|
Lock lock = sl.asWriteLock(); |
897 |
< |
lock.lock(); |
898 |
< |
assertFalse(lock.tryLock()); |
899 |
< |
lock.unlock(); |
900 |
< |
assertTrue(lock.tryLock()); |
897 |
> |
for (Action locker : lockLockers(lock)) { |
898 |
> |
locker.run(); |
899 |
> |
assertTrue(sl.isWriteLocked()); |
900 |
> |
assertFalse(sl.isReadLocked()); |
901 |
> |
assertFalse(lock.tryLock()); |
902 |
> |
lock.unlock(); |
903 |
> |
assertUnlocked(sl); |
904 |
> |
} |
905 |
|
} |
906 |
|
|
907 |
|
/** |
908 |
|
* asReadLock can be locked and unlocked |
909 |
|
*/ |
910 |
< |
public void testAsReadLock() { |
910 |
> |
public void testAsReadLock() throws Throwable { |
911 |
|
StampedLock sl = new StampedLock(); |
912 |
|
Lock lock = sl.asReadLock(); |
913 |
< |
lock.lock(); |
914 |
< |
lock.unlock(); |
915 |
< |
assertTrue(lock.tryLock()); |
913 |
> |
for (Action locker : lockLockers(lock)) { |
914 |
> |
locker.run(); |
915 |
> |
assertTrue(sl.isReadLocked()); |
916 |
> |
assertFalse(sl.isWriteLocked()); |
917 |
> |
assertEquals(1, sl.getReadLockCount()); |
918 |
> |
locker.run(); |
919 |
> |
assertTrue(sl.isReadLocked()); |
920 |
> |
assertEquals(2, sl.getReadLockCount()); |
921 |
> |
lock.unlock(); |
922 |
> |
lock.unlock(); |
923 |
> |
assertUnlocked(sl); |
924 |
> |
} |
925 |
|
} |
926 |
|
|
927 |
|
/** |
928 |
|
* asReadWriteLock.writeLock can be locked and unlocked |
929 |
|
*/ |
930 |
< |
public void testAsReadWriteLockWriteLock() { |
930 |
> |
public void testAsReadWriteLockWriteLock() throws Throwable { |
931 |
|
StampedLock sl = new StampedLock(); |
932 |
|
Lock lock = sl.asReadWriteLock().writeLock(); |
933 |
< |
lock.lock(); |
934 |
< |
assertFalse(lock.tryLock()); |
935 |
< |
lock.unlock(); |
936 |
< |
assertTrue(lock.tryLock()); |
933 |
> |
for (Action locker : lockLockers(lock)) { |
934 |
> |
locker.run(); |
935 |
> |
assertTrue(sl.isWriteLocked()); |
936 |
> |
assertFalse(sl.isReadLocked()); |
937 |
> |
assertFalse(lock.tryLock()); |
938 |
> |
lock.unlock(); |
939 |
> |
assertUnlocked(sl); |
940 |
> |
} |
941 |
|
} |
942 |
|
|
943 |
|
/** |
944 |
|
* asReadWriteLock.readLock can be locked and unlocked |
945 |
|
*/ |
946 |
< |
public void testAsReadWriteLockReadLock() { |
946 |
> |
public void testAsReadWriteLockReadLock() throws Throwable { |
947 |
|
StampedLock sl = new StampedLock(); |
948 |
|
Lock lock = sl.asReadWriteLock().readLock(); |
949 |
< |
lock.lock(); |
950 |
< |
lock.unlock(); |
951 |
< |
assertTrue(lock.tryLock()); |
949 |
> |
for (Action locker : lockLockers(lock)) { |
950 |
> |
locker.run(); |
951 |
> |
assertTrue(sl.isReadLocked()); |
952 |
> |
assertFalse(sl.isWriteLocked()); |
953 |
> |
assertEquals(1, sl.getReadLockCount()); |
954 |
> |
locker.run(); |
955 |
> |
assertTrue(sl.isReadLocked()); |
956 |
> |
assertEquals(2, sl.getReadLockCount()); |
957 |
> |
lock.unlock(); |
958 |
> |
lock.unlock(); |
959 |
> |
assertUnlocked(sl); |
960 |
> |
} |
961 |
> |
} |
962 |
> |
|
963 |
> |
/** |
964 |
> |
* Lock.newCondition throws UnsupportedOperationException |
965 |
> |
*/ |
966 |
> |
public void testLockViewsDoNotSupportConditions() { |
967 |
> |
StampedLock sl = new StampedLock(); |
968 |
> |
assertThrows(UnsupportedOperationException.class, |
969 |
> |
() -> sl.asWriteLock().newCondition(), |
970 |
> |
() -> sl.asReadLock().newCondition(), |
971 |
> |
() -> sl.asReadWriteLock().writeLock().newCondition(), |
972 |
> |
() -> sl.asReadWriteLock().readLock().newCondition()); |
973 |
> |
} |
974 |
> |
|
975 |
> |
/** |
976 |
> |
* Passing optimistic read stamps to unlock operations result in |
977 |
> |
* IllegalMonitorStateException |
978 |
> |
*/ |
979 |
> |
public void testCannotUnlockOptimisticReadStamps() { |
980 |
> |
Runnable[] actions = { |
981 |
> |
() -> { |
982 |
> |
StampedLock sl = new StampedLock(); |
983 |
> |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
984 |
> |
sl.unlockRead(stamp); |
985 |
> |
}, |
986 |
> |
() -> { |
987 |
> |
StampedLock sl = new StampedLock(); |
988 |
> |
long stamp = sl.tryOptimisticRead(); |
989 |
> |
sl.unlock(stamp); |
990 |
> |
}, |
991 |
> |
|
992 |
> |
() -> { |
993 |
> |
StampedLock sl = new StampedLock(); |
994 |
> |
long stamp = sl.tryOptimisticRead(); |
995 |
> |
sl.writeLock(); |
996 |
> |
sl.unlock(stamp); |
997 |
> |
}, |
998 |
> |
() -> { |
999 |
> |
StampedLock sl = new StampedLock(); |
1000 |
> |
sl.readLock(); |
1001 |
> |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
1002 |
> |
sl.unlockRead(stamp); |
1003 |
> |
}, |
1004 |
> |
() -> { |
1005 |
> |
StampedLock sl = new StampedLock(); |
1006 |
> |
sl.readLock(); |
1007 |
> |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
1008 |
> |
sl.unlock(stamp); |
1009 |
> |
}, |
1010 |
> |
|
1011 |
> |
() -> { |
1012 |
> |
StampedLock sl = new StampedLock(); |
1013 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1014 |
> |
assertValid(sl, stamp); |
1015 |
> |
sl.writeLock(); |
1016 |
> |
sl.unlockWrite(stamp); |
1017 |
> |
}, |
1018 |
> |
() -> { |
1019 |
> |
StampedLock sl = new StampedLock(); |
1020 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1021 |
> |
sl.writeLock(); |
1022 |
> |
sl.unlock(stamp); |
1023 |
> |
}, |
1024 |
> |
() -> { |
1025 |
> |
StampedLock sl = new StampedLock(); |
1026 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1027 |
> |
sl.readLock(); |
1028 |
> |
sl.unlockRead(stamp); |
1029 |
> |
}, |
1030 |
> |
() -> { |
1031 |
> |
StampedLock sl = new StampedLock(); |
1032 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1033 |
> |
sl.readLock(); |
1034 |
> |
sl.unlock(stamp); |
1035 |
> |
}, |
1036 |
> |
|
1037 |
> |
() -> { |
1038 |
> |
StampedLock sl = new StampedLock(); |
1039 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1040 |
> |
assertValid(sl, stamp); |
1041 |
> |
sl.writeLock(); |
1042 |
> |
sl.unlockWrite(stamp); |
1043 |
> |
}, |
1044 |
> |
() -> { |
1045 |
> |
StampedLock sl = new StampedLock(); |
1046 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1047 |
> |
sl.writeLock(); |
1048 |
> |
sl.unlock(stamp); |
1049 |
> |
}, |
1050 |
> |
() -> { |
1051 |
> |
StampedLock sl = new StampedLock(); |
1052 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1053 |
> |
sl.readLock(); |
1054 |
> |
sl.unlockRead(stamp); |
1055 |
> |
}, |
1056 |
> |
() -> { |
1057 |
> |
StampedLock sl = new StampedLock(); |
1058 |
> |
sl.readLock(); |
1059 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1060 |
> |
assertValid(sl, stamp); |
1061 |
> |
sl.readLock(); |
1062 |
> |
sl.unlockRead(stamp); |
1063 |
> |
}, |
1064 |
> |
() -> { |
1065 |
> |
StampedLock sl = new StampedLock(); |
1066 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1067 |
> |
sl.readLock(); |
1068 |
> |
sl.unlock(stamp); |
1069 |
> |
}, |
1070 |
> |
() -> { |
1071 |
> |
StampedLock sl = new StampedLock(); |
1072 |
> |
sl.readLock(); |
1073 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1074 |
> |
sl.readLock(); |
1075 |
> |
sl.unlock(stamp); |
1076 |
> |
}, |
1077 |
> |
}; |
1078 |
> |
|
1079 |
> |
assertThrows(IllegalMonitorStateException.class, actions); |
1080 |
> |
} |
1081 |
> |
|
1082 |
> |
static long writeLockInterruptiblyUninterrupted(StampedLock sl) { |
1083 |
> |
try { return sl.writeLockInterruptibly(); } |
1084 |
> |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1085 |
> |
} |
1086 |
> |
|
1087 |
> |
static long tryWriteLockUninterrupted(StampedLock sl, long time, TimeUnit unit) { |
1088 |
> |
try { return sl.tryWriteLock(time, unit); } |
1089 |
> |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1090 |
> |
} |
1091 |
> |
|
1092 |
> |
static long readLockInterruptiblyUninterrupted(StampedLock sl) { |
1093 |
> |
try { return sl.readLockInterruptibly(); } |
1094 |
> |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1095 |
> |
} |
1096 |
> |
|
1097 |
> |
static long tryReadLockUninterrupted(StampedLock sl, long time, TimeUnit unit) { |
1098 |
> |
try { return sl.tryReadLock(time, unit); } |
1099 |
> |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1100 |
> |
} |
1101 |
> |
|
1102 |
> |
/** |
1103 |
> |
* Invalid stamps result in IllegalMonitorStateException |
1104 |
> |
*/ |
1105 |
> |
public void testInvalidStampsThrowIllegalMonitorStateException() { |
1106 |
> |
final StampedLock sl = new StampedLock(); |
1107 |
> |
|
1108 |
> |
assertThrows(IllegalMonitorStateException.class, |
1109 |
> |
() -> sl.unlockWrite(0L), |
1110 |
> |
() -> sl.unlockRead(0L), |
1111 |
> |
() -> sl.unlock(0L)); |
1112 |
> |
|
1113 |
> |
final long optimisticStamp = sl.tryOptimisticRead(); |
1114 |
> |
final long readStamp = sl.readLock(); |
1115 |
> |
sl.unlockRead(readStamp); |
1116 |
> |
final long writeStamp = sl.writeLock(); |
1117 |
> |
sl.unlockWrite(writeStamp); |
1118 |
> |
assertTrue(optimisticStamp != 0L && readStamp != 0L && writeStamp != 0L); |
1119 |
> |
final long[] noLongerValidStamps = { optimisticStamp, readStamp, writeStamp }; |
1120 |
> |
final Runnable assertNoLongerValidStampsThrow = () -> { |
1121 |
> |
for (long noLongerValidStamp : noLongerValidStamps) |
1122 |
> |
assertThrows(IllegalMonitorStateException.class, |
1123 |
> |
() -> sl.unlockWrite(noLongerValidStamp), |
1124 |
> |
() -> sl.unlockRead(noLongerValidStamp), |
1125 |
> |
() -> sl.unlock(noLongerValidStamp)); |
1126 |
> |
}; |
1127 |
> |
assertNoLongerValidStampsThrow.run(); |
1128 |
> |
|
1129 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) |
1130 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
1131 |
> |
final long stamp = readLocker.apply(sl); |
1132 |
> |
assertValid(sl, stamp); |
1133 |
> |
assertNoLongerValidStampsThrow.run(); |
1134 |
> |
assertThrows(IllegalMonitorStateException.class, |
1135 |
> |
() -> sl.unlockWrite(stamp), |
1136 |
> |
() -> sl.unlockRead(sl.tryOptimisticRead()), |
1137 |
> |
() -> sl.unlockRead(0L)); |
1138 |
> |
readUnlocker.accept(sl, stamp); |
1139 |
> |
assertUnlocked(sl); |
1140 |
> |
assertNoLongerValidStampsThrow.run(); |
1141 |
> |
} |
1142 |
> |
|
1143 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
1144 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
1145 |
> |
final long stamp = writeLocker.apply(sl); |
1146 |
> |
assertValid(sl, stamp); |
1147 |
> |
assertNoLongerValidStampsThrow.run(); |
1148 |
> |
assertThrows(IllegalMonitorStateException.class, |
1149 |
> |
() -> sl.unlockRead(stamp), |
1150 |
> |
() -> sl.unlockWrite(0L)); |
1151 |
> |
writeUnlocker.accept(sl, stamp); |
1152 |
> |
assertUnlocked(sl); |
1153 |
> |
assertNoLongerValidStampsThrow.run(); |
1154 |
> |
} |
1155 |
> |
} |
1156 |
> |
|
1157 |
> |
/** |
1158 |
> |
* Read locks can be very deeply nested |
1159 |
> |
*/ |
1160 |
> |
public void testDeeplyNestedReadLocks() { |
1161 |
> |
final StampedLock lock = new StampedLock(); |
1162 |
> |
final int depth = 300; |
1163 |
> |
final long[] stamps = new long[depth]; |
1164 |
> |
final List<Function<StampedLock, Long>> readLockers = readLockers(); |
1165 |
> |
final List<BiConsumer<StampedLock, Long>> readUnlockers = readUnlockers(); |
1166 |
> |
for (int i = 0; i < depth; i++) { |
1167 |
> |
Function<StampedLock, Long> readLocker |
1168 |
> |
= readLockers.get(i % readLockers.size()); |
1169 |
> |
long stamp = readLocker.apply(lock); |
1170 |
> |
assertEquals(i + 1, lock.getReadLockCount()); |
1171 |
> |
assertTrue(lock.isReadLocked()); |
1172 |
> |
stamps[i] = stamp; |
1173 |
> |
} |
1174 |
> |
for (int i = 0; i < depth; i++) { |
1175 |
> |
BiConsumer<StampedLock, Long> readUnlocker |
1176 |
> |
= readUnlockers.get(i % readUnlockers.size()); |
1177 |
> |
assertEquals(depth - i, lock.getReadLockCount()); |
1178 |
> |
assertTrue(lock.isReadLocked()); |
1179 |
> |
readUnlocker.accept(lock, stamps[depth - 1 - i]); |
1180 |
> |
} |
1181 |
> |
assertUnlocked(lock); |
1182 |
> |
} |
1183 |
> |
|
1184 |
> |
/** |
1185 |
> |
* Stamped locks are not reentrant. |
1186 |
> |
*/ |
1187 |
> |
public void testNonReentrant() throws InterruptedException { |
1188 |
> |
final StampedLock lock = new StampedLock(); |
1189 |
> |
long stamp; |
1190 |
> |
|
1191 |
> |
stamp = lock.writeLock(); |
1192 |
> |
assertValid(lock, stamp); |
1193 |
> |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
1194 |
> |
assertEquals(0L, lock.tryReadLock(0L, DAYS)); |
1195 |
> |
assertValid(lock, stamp); |
1196 |
> |
lock.unlockWrite(stamp); |
1197 |
> |
|
1198 |
> |
stamp = lock.tryWriteLock(1L, DAYS); |
1199 |
> |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
1200 |
> |
assertValid(lock, stamp); |
1201 |
> |
lock.unlockWrite(stamp); |
1202 |
> |
|
1203 |
> |
stamp = lock.readLock(); |
1204 |
> |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
1205 |
> |
assertValid(lock, stamp); |
1206 |
> |
lock.unlockRead(stamp); |
1207 |
> |
} |
1208 |
> |
|
1209 |
> |
/** |
1210 |
> |
* """StampedLocks have no notion of ownership. Locks acquired in |
1211 |
> |
* one thread can be released or converted in another.""" |
1212 |
> |
*/ |
1213 |
> |
public void testNoOwnership() throws Throwable { |
1214 |
> |
ArrayList<Future<?>> futures = new ArrayList<>(); |
1215 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
1216 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
1217 |
> |
StampedLock lock = new StampedLock(); |
1218 |
> |
long stamp = writeLocker.apply(lock); |
1219 |
> |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
1220 |
> |
public void realRun() { |
1221 |
> |
writeUnlocker.accept(lock, stamp); |
1222 |
> |
assertUnlocked(lock); |
1223 |
> |
assertFalse(lock.validate(stamp)); |
1224 |
> |
}})); |
1225 |
> |
} |
1226 |
> |
for (Future<?> future : futures) |
1227 |
> |
assertNull(future.get()); |
1228 |
> |
} |
1229 |
> |
|
1230 |
> |
/** Tries out sample usage code from StampedLock javadoc. */ |
1231 |
> |
public void testSampleUsage() throws Throwable { |
1232 |
> |
class Point { |
1233 |
> |
private double x, y; |
1234 |
> |
private final StampedLock sl = new StampedLock(); |
1235 |
> |
|
1236 |
> |
void move(double deltaX, double deltaY) { // an exclusively locked method |
1237 |
> |
long stamp = sl.writeLock(); |
1238 |
> |
try { |
1239 |
> |
x += deltaX; |
1240 |
> |
y += deltaY; |
1241 |
> |
} finally { |
1242 |
> |
sl.unlockWrite(stamp); |
1243 |
> |
} |
1244 |
> |
} |
1245 |
> |
|
1246 |
> |
double distanceFromOrigin() { // A read-only method |
1247 |
> |
double currentX, currentY; |
1248 |
> |
long stamp = sl.tryOptimisticRead(); |
1249 |
> |
do { |
1250 |
> |
if (stamp == 0L) |
1251 |
> |
stamp = sl.readLock(); |
1252 |
> |
try { |
1253 |
> |
// possibly racy reads |
1254 |
> |
currentX = x; |
1255 |
> |
currentY = y; |
1256 |
> |
} finally { |
1257 |
> |
stamp = sl.tryConvertToOptimisticRead(stamp); |
1258 |
> |
} |
1259 |
> |
} while (stamp == 0); |
1260 |
> |
return Math.hypot(currentX, currentY); |
1261 |
> |
} |
1262 |
> |
} |
1263 |
> |
|
1264 |
> |
Point p = new Point(); |
1265 |
> |
p.move(3.0, 4.0); |
1266 |
> |
assertEquals(5.0, p.distanceFromOrigin()); |
1267 |
|
} |
1268 |
|
|
1269 |
|
} |