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* http://creativecommons.org/publicdomain/zero/1.0/ |
6 |
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*/ |
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|
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import static java.util.concurrent.TimeUnit.DAYS; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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|
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import static java.util.concurrent.locks.StampedLock.isLockStamp; |
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import static java.util.concurrent.locks.StampedLock.isOptimisticReadStamp; |
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import static java.util.concurrent.locks.StampedLock.isReadLockStamp; |
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import static java.util.concurrent.locks.StampedLock.isWriteLockStamp; |
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|
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.concurrent.Callable; |
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import java.util.concurrent.CompletableFuture; |
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import java.util.concurrent.CountDownLatch; |
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import java.util.concurrent.Future; |
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import java.util.concurrent.ThreadLocalRandom; |
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import java.util.concurrent.TimeUnit; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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import java.util.concurrent.locks.Lock; |
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import java.util.concurrent.locks.StampedLock; |
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import java.util.function.BiConsumer; |
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import java.util.function.Consumer; |
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import java.util.function.Function; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class StampedLockTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
36 |
> |
main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(StampedLockTest.class); |
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} |
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|
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/** |
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* A runnable calling writeLockInterruptibly |
27 |
– |
*/ |
28 |
– |
class InterruptibleLockRunnable extends CheckedRunnable { |
29 |
– |
final StampedLock lock; |
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– |
InterruptibleLockRunnable(StampedLock l) { lock = l; } |
31 |
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public void realRun() throws InterruptedException { |
32 |
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lock.writeLockInterruptibly(); |
33 |
– |
} |
34 |
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} |
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|
36 |
– |
/** |
37 |
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* A runnable calling writeLockInterruptibly that expects to be |
38 |
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* interrupted |
39 |
– |
*/ |
40 |
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class InterruptedLockRunnable extends CheckedInterruptedRunnable { |
41 |
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final StampedLock lock; |
42 |
– |
InterruptedLockRunnable(StampedLock l) { lock = l; } |
43 |
– |
public void realRun() throws InterruptedException { |
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lock.writeLockInterruptibly(); |
45 |
– |
} |
46 |
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} |
47 |
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|
48 |
– |
/** |
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* Releases write lock, checking isWriteLocked before and after |
44 |
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*/ |
45 |
< |
void releaseWriteLock(StampedLock lock, long s) { |
45 |
> |
void releaseWriteLock(StampedLock lock, long stamp) { |
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assertTrue(lock.isWriteLocked()); |
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< |
lock.unlockWrite(s); |
47 |
> |
assertValid(lock, stamp); |
48 |
> |
lock.unlockWrite(stamp); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.validate(stamp)); |
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} |
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|
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/** |
54 |
< |
* Constructed StampedLock is in unlocked state |
54 |
> |
* Releases read lock, checking isReadLocked before and after |
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*/ |
56 |
< |
public void testConstructor() { |
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< |
StampedLock lock; |
58 |
< |
lock = new StampedLock(); |
59 |
< |
assertFalse(lock.isWriteLocked()); |
56 |
> |
void releaseReadLock(StampedLock lock, long stamp) { |
57 |
> |
assertTrue(lock.isReadLocked()); |
58 |
> |
assertValid(lock, stamp); |
59 |
> |
lock.unlockRead(stamp); |
60 |
|
assertFalse(lock.isReadLocked()); |
61 |
< |
assertEquals(lock.getReadLockCount(), 0); |
61 |
> |
assertTrue(lock.validate(stamp)); |
62 |
|
} |
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|
64 |
< |
/** |
65 |
< |
* write-locking and read-locking an unlocked lock succeed |
66 |
< |
*/ |
71 |
< |
public void testLock() { |
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< |
StampedLock lock = new StampedLock(); |
73 |
< |
assertFalse(lock.isWriteLocked()); |
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< |
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 |
< |
assertFalse(lock.isReadLocked()); |
83 |
< |
assertEquals(lock.getReadLockCount(), 0); |
84 |
< |
long rs = lock.readLock(); |
85 |
< |
assertFalse(lock.isWriteLocked()); |
86 |
< |
assertTrue(lock.isReadLocked()); |
87 |
< |
assertEquals(lock.getReadLockCount(), 1); |
88 |
< |
lock.unlockRead(rs); |
89 |
< |
assertFalse(lock.isWriteLocked()); |
90 |
< |
assertFalse(lock.isReadLocked()); |
91 |
< |
assertEquals(lock.getReadLockCount(), 0); |
64 |
> |
long assertNonZero(long v) { |
65 |
> |
assertTrue(v != 0L); |
66 |
> |
return v; |
67 |
|
} |
68 |
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|
69 |
< |
/** |
70 |
< |
* unlock releases either a read or write lock |
71 |
< |
*/ |
72 |
< |
public void testUnlock() { |
98 |
< |
StampedLock lock = new StampedLock(); |
99 |
< |
assertFalse(lock.isWriteLocked()); |
100 |
< |
assertFalse(lock.isReadLocked()); |
101 |
< |
assertEquals(lock.getReadLockCount(), 0); |
102 |
< |
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 |
< |
assertEquals(lock.getReadLockCount(), 0); |
69 |
> |
long assertValid(StampedLock lock, long stamp) { |
70 |
> |
assertTrue(stamp != 0L); |
71 |
> |
assertTrue(lock.validate(stamp)); |
72 |
> |
return stamp; |
73 |
|
} |
74 |
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|
75 |
< |
/** |
121 |
< |
* tryUnlockRead/Write succeeds if locked in associated mode else |
122 |
< |
* returns false |
123 |
< |
*/ |
124 |
< |
public void testTryUnlock() { |
125 |
< |
StampedLock lock = new StampedLock(); |
126 |
< |
assertFalse(lock.isWriteLocked()); |
127 |
< |
assertFalse(lock.isReadLocked()); |
128 |
< |
assertEquals(lock.getReadLockCount(), 0); |
129 |
< |
long s = lock.writeLock(); |
130 |
< |
assertTrue(lock.isWriteLocked()); |
75 |
> |
void assertUnlocked(StampedLock lock) { |
76 |
|
assertFalse(lock.isReadLocked()); |
132 |
– |
assertEquals(lock.getReadLockCount(), 0); |
133 |
– |
assertFalse(lock.tryUnlockRead()); |
134 |
– |
assertTrue(lock.tryUnlockWrite()); |
135 |
– |
assertFalse(lock.tryUnlockWrite()); |
136 |
– |
assertFalse(lock.tryUnlockRead()); |
77 |
|
assertFalse(lock.isWriteLocked()); |
78 |
< |
assertFalse(lock.isReadLocked()); |
79 |
< |
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); |
78 |
> |
assertEquals(0, lock.getReadLockCount()); |
79 |
> |
assertValid(lock, lock.tryOptimisticRead()); |
80 |
|
} |
81 |
|
|
82 |
< |
/** |
83 |
< |
* write-unlocking an unlocked lock throws IllegalMonitorStateException |
84 |
< |
*/ |
85 |
< |
public void testWriteUnlock_IMSE() { |
86 |
< |
StampedLock lock = new StampedLock(); |
87 |
< |
try { |
88 |
< |
lock.unlockWrite(0L); |
89 |
< |
shouldThrow(); |
90 |
< |
} catch (IllegalMonitorStateException success) {} |
82 |
> |
List<Action> lockLockers(Lock lock) { |
83 |
> |
return List.of( |
84 |
> |
() -> lock.lock(), |
85 |
> |
() -> lock.lockInterruptibly(), |
86 |
> |
() -> lock.tryLock(), |
87 |
> |
() -> lock.tryLock(Long.MIN_VALUE, DAYS), |
88 |
> |
() -> lock.tryLock(0L, DAYS), |
89 |
> |
() -> lock.tryLock(Long.MAX_VALUE, DAYS)); |
90 |
> |
} |
91 |
> |
|
92 |
> |
List<Function<StampedLock, Long>> readLockers() { |
93 |
> |
return List.of( |
94 |
> |
sl -> sl.readLock(), |
95 |
> |
sl -> sl.tryReadLock(), |
96 |
> |
sl -> readLockInterruptiblyUninterrupted(sl), |
97 |
> |
sl -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS), |
98 |
> |
sl -> tryReadLockUninterrupted(sl, 0L, DAYS), |
99 |
> |
sl -> sl.tryConvertToReadLock(sl.tryOptimisticRead())); |
100 |
> |
} |
101 |
> |
|
102 |
> |
List<BiConsumer<StampedLock, Long>> readUnlockers() { |
103 |
> |
return List.of( |
104 |
> |
(sl, stamp) -> sl.unlockRead(stamp), |
105 |
> |
(sl, stamp) -> assertTrue(sl.tryUnlockRead()), |
106 |
> |
(sl, stamp) -> sl.asReadLock().unlock(), |
107 |
> |
(sl, stamp) -> sl.unlock(stamp), |
108 |
> |
(sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp))); |
109 |
> |
} |
110 |
> |
|
111 |
> |
List<Function<StampedLock, Long>> writeLockers() { |
112 |
> |
return List.of( |
113 |
> |
sl -> sl.writeLock(), |
114 |
> |
sl -> sl.tryWriteLock(), |
115 |
> |
sl -> writeLockInterruptiblyUninterrupted(sl), |
116 |
> |
sl -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS), |
117 |
> |
sl -> tryWriteLockUninterrupted(sl, 0L, DAYS), |
118 |
> |
sl -> sl.tryConvertToWriteLock(sl.tryOptimisticRead())); |
119 |
> |
} |
120 |
> |
|
121 |
> |
List<BiConsumer<StampedLock, Long>> writeUnlockers() { |
122 |
> |
return List.of( |
123 |
> |
(sl, stamp) -> sl.unlockWrite(stamp), |
124 |
> |
(sl, stamp) -> assertTrue(sl.tryUnlockWrite()), |
125 |
> |
(sl, stamp) -> sl.asWriteLock().unlock(), |
126 |
> |
(sl, stamp) -> sl.unlock(stamp), |
127 |
> |
(sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp))); |
128 |
|
} |
129 |
|
|
130 |
|
/** |
131 |
< |
* write-unlocking an unlocked lock throws IllegalMonitorStateException |
131 |
> |
* Constructed StampedLock is in unlocked state |
132 |
|
*/ |
133 |
< |
public void testWriteUnlock_IMSE2() { |
134 |
< |
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) {} |
133 |
> |
public void testConstructor() { |
134 |
> |
assertUnlocked(new StampedLock()); |
135 |
|
} |
136 |
|
|
137 |
|
/** |
138 |
< |
* write-unlocking after readlock throws IllegalMonitorStateException |
138 |
> |
* write-locking, then unlocking, an unlocked lock succeed |
139 |
|
*/ |
140 |
< |
public void testWriteUnlock_IMSE3() { |
140 |
> |
public void testWriteLock_lockUnlock() { |
141 |
|
StampedLock lock = new StampedLock(); |
142 |
< |
try { |
143 |
< |
long s = lock.readLock(); |
144 |
< |
lock.unlockWrite(s); |
145 |
< |
shouldThrow(); |
146 |
< |
} catch (IllegalMonitorStateException success) {} |
142 |
> |
|
143 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
144 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
145 |
> |
assertFalse(lock.isWriteLocked()); |
146 |
> |
assertFalse(lock.isReadLocked()); |
147 |
> |
assertEquals(0, lock.getReadLockCount()); |
148 |
> |
|
149 |
> |
long s = writeLocker.apply(lock); |
150 |
> |
assertValid(lock, s); |
151 |
> |
assertTrue(lock.isWriteLocked()); |
152 |
> |
assertFalse(lock.isReadLocked()); |
153 |
> |
assertEquals(0, lock.getReadLockCount()); |
154 |
> |
writeUnlocker.accept(lock, s); |
155 |
> |
assertUnlocked(lock); |
156 |
> |
} |
157 |
|
} |
158 |
|
|
159 |
|
/** |
160 |
< |
* read-unlocking an unlocked lock throws IllegalMonitorStateException |
160 |
> |
* read-locking, then unlocking, an unlocked lock succeed |
161 |
|
*/ |
162 |
< |
public void testReadUnlock_IMSE() { |
162 |
> |
public void testReadLock_lockUnlock() { |
163 |
|
StampedLock lock = new StampedLock(); |
164 |
< |
try { |
165 |
< |
long s = lock.readLock(); |
166 |
< |
lock.unlockRead(s); |
167 |
< |
lock.unlockRead(s); |
168 |
< |
shouldThrow(); |
169 |
< |
} catch (IllegalMonitorStateException success) {} |
164 |
> |
|
165 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) |
166 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
167 |
> |
long s = 42; |
168 |
> |
for (int i = 0; i < 2; i++) { |
169 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
170 |
> |
assertFalse(lock.isWriteLocked()); |
171 |
> |
assertTrue(lock.isReadLocked()); |
172 |
> |
assertEquals(i + 1, lock.getReadLockCount()); |
173 |
> |
} |
174 |
> |
for (int i = 0; i < 2; i++) { |
175 |
> |
assertFalse(lock.isWriteLocked()); |
176 |
> |
assertTrue(lock.isReadLocked()); |
177 |
> |
assertEquals(2 - i, lock.getReadLockCount()); |
178 |
> |
readUnlocker.accept(lock, s); |
179 |
> |
} |
180 |
> |
assertUnlocked(lock); |
181 |
> |
} |
182 |
|
} |
183 |
|
|
184 |
|
/** |
185 |
< |
* read-unlocking an unlocked lock throws IllegalMonitorStateException |
185 |
> |
* tryUnlockWrite fails if not write locked |
186 |
|
*/ |
187 |
< |
public void testReadUnlock_IMSE2() { |
187 |
> |
public void testTryUnlockWrite_failure() { |
188 |
|
StampedLock lock = new StampedLock(); |
189 |
< |
try { |
190 |
< |
lock.unlockRead(0L); |
191 |
< |
shouldThrow(); |
192 |
< |
} catch (IllegalMonitorStateException success) {} |
189 |
> |
assertFalse(lock.tryUnlockWrite()); |
190 |
> |
|
191 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) |
192 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
193 |
> |
long s = assertValid(lock, readLocker.apply(lock)); |
194 |
> |
assertFalse(lock.tryUnlockWrite()); |
195 |
> |
assertTrue(lock.isReadLocked()); |
196 |
> |
readUnlocker.accept(lock, s); |
197 |
> |
assertUnlocked(lock); |
198 |
> |
} |
199 |
|
} |
200 |
|
|
201 |
|
/** |
202 |
< |
* read-unlocking after writeLock throws IllegalMonitorStateException |
202 |
> |
* tryUnlockRead fails if not read locked |
203 |
|
*/ |
204 |
< |
public void testReadUnlock_IMSE3() { |
204 |
> |
public void testTryUnlockRead_failure() { |
205 |
|
StampedLock lock = new StampedLock(); |
206 |
< |
try { |
207 |
< |
long s = lock.writeLock(); |
208 |
< |
lock.unlockRead(s); |
209 |
< |
shouldThrow(); |
210 |
< |
} catch (IllegalMonitorStateException success) {} |
206 |
> |
assertFalse(lock.tryUnlockRead()); |
207 |
> |
|
208 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
209 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
210 |
> |
long s = writeLocker.apply(lock); |
211 |
> |
assertFalse(lock.tryUnlockRead()); |
212 |
> |
assertTrue(lock.isWriteLocked()); |
213 |
> |
writeUnlocker.accept(lock, s); |
214 |
> |
assertUnlocked(lock); |
215 |
> |
} |
216 |
|
} |
217 |
|
|
218 |
|
/** |
219 |
< |
* validate(0) fails |
219 |
> |
* validate(0L) fails |
220 |
|
*/ |
221 |
|
public void testValidate0() { |
222 |
|
StampedLock lock = new StampedLock(); |
224 |
|
} |
225 |
|
|
226 |
|
/** |
227 |
< |
* A stamp obtained from a successful lock operation validates |
227 |
> |
* A stamp obtained from a successful lock operation validates while the lock is held |
228 |
|
*/ |
229 |
< |
public void testValidate() { |
230 |
< |
try { |
231 |
< |
StampedLock lock = new StampedLock(); |
232 |
< |
long s = lock.writeLock(); |
233 |
< |
assertTrue(lock.validate(s)); |
234 |
< |
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); |
229 |
> |
public void testValidate() throws InterruptedException { |
230 |
> |
StampedLock lock = new StampedLock(); |
231 |
> |
|
232 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) |
233 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
234 |
> |
long s = assertNonZero(readLocker.apply(lock)); |
235 |
|
assertTrue(lock.validate(s)); |
236 |
< |
lock.unlockWrite(s); |
237 |
< |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
236 |
> |
readUnlocker.accept(lock, s); |
237 |
> |
} |
238 |
> |
|
239 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
240 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
241 |
> |
long s = assertNonZero(writeLocker.apply(lock)); |
242 |
|
assertTrue(lock.validate(s)); |
243 |
< |
lock.unlockRead(s); |
257 |
< |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
258 |
< |
} catch (InterruptedException ie) { |
259 |
< |
threadUnexpectedException(ie); |
243 |
> |
writeUnlocker.accept(lock, s); |
244 |
|
} |
245 |
|
} |
246 |
|
|
247 |
|
/** |
248 |
|
* A stamp obtained from an unsuccessful lock operation does not validate |
249 |
|
*/ |
250 |
< |
public void testValidate2() { |
251 |
< |
try { |
252 |
< |
StampedLock lock = new StampedLock(); |
253 |
< |
long s; |
254 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
255 |
< |
assertTrue(lock.validate(s)); |
256 |
< |
assertFalse(lock.validate(lock.tryWriteLock())); |
257 |
< |
assertFalse(lock.validate(lock.tryWriteLock(10L, MILLISECONDS))); |
258 |
< |
assertFalse(lock.validate(lock.tryReadLock())); |
259 |
< |
assertFalse(lock.validate(lock.tryReadLock(10L, MILLISECONDS))); |
260 |
< |
assertFalse(lock.validate(lock.tryOptimisticRead())); |
261 |
< |
lock.unlockWrite(s); |
262 |
< |
} catch (InterruptedException ie) { |
263 |
< |
threadUnexpectedException(ie); |
250 |
> |
public void testValidate2() throws InterruptedException { |
251 |
> |
StampedLock lock = new StampedLock(); |
252 |
> |
long s = assertNonZero(lock.writeLock()); |
253 |
> |
assertTrue(lock.validate(s)); |
254 |
> |
assertFalse(lock.validate(lock.tryWriteLock())); |
255 |
> |
assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(), |
256 |
> |
randomTimeUnit()))); |
257 |
> |
assertFalse(lock.validate(lock.tryReadLock())); |
258 |
> |
assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(), |
259 |
> |
randomTimeUnit()))); |
260 |
> |
assertFalse(lock.validate(lock.tryOptimisticRead())); |
261 |
> |
lock.unlockWrite(s); |
262 |
> |
} |
263 |
> |
|
264 |
> |
void assertThrowInterruptedExceptionWhenPreInterrupted(Action[] actions) { |
265 |
> |
for (Action action : actions) { |
266 |
> |
Thread.currentThread().interrupt(); |
267 |
> |
try { |
268 |
> |
action.run(); |
269 |
> |
shouldThrow(); |
270 |
> |
} |
271 |
> |
catch (InterruptedException success) {} |
272 |
> |
catch (Throwable fail) { threadUnexpectedException(fail); } |
273 |
> |
assertFalse(Thread.interrupted()); |
274 |
|
} |
275 |
|
} |
276 |
|
|
277 |
|
/** |
278 |
< |
* writeLockInterruptibly is interruptible |
278 |
> |
* interruptible operations throw InterruptedException when pre-interrupted |
279 |
|
*/ |
280 |
< |
public void testWriteLockInterruptibly_Interruptible() { |
287 |
< |
final CountDownLatch running = new CountDownLatch(1); |
280 |
> |
public void testInterruptibleOperationsThrowInterruptedExceptionWhenPreInterrupted() { |
281 |
|
final StampedLock lock = new StampedLock(); |
282 |
< |
long s = lock.writeLock(); |
283 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
284 |
< |
public void realRun() throws InterruptedException { |
285 |
< |
running.countDown(); |
286 |
< |
lock.writeLockInterruptibly(); |
287 |
< |
}}); |
288 |
< |
try { |
289 |
< |
running.await(); |
290 |
< |
waitForThreadToEnterWaitState(t, 100); |
291 |
< |
t.interrupt(); |
292 |
< |
awaitTermination(t); |
293 |
< |
releaseWriteLock(lock, s); |
294 |
< |
} catch (InterruptedException ie) { |
295 |
< |
threadUnexpectedException(ie); |
282 |
> |
|
283 |
> |
Action[] interruptibleLockActions = { |
284 |
> |
() -> lock.writeLockInterruptibly(), |
285 |
> |
() -> lock.tryWriteLock(Long.MIN_VALUE, DAYS), |
286 |
> |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
287 |
> |
() -> lock.readLockInterruptibly(), |
288 |
> |
() -> lock.tryReadLock(Long.MIN_VALUE, DAYS), |
289 |
> |
() -> lock.tryReadLock(Long.MAX_VALUE, DAYS), |
290 |
> |
() -> lock.asWriteLock().lockInterruptibly(), |
291 |
> |
() -> lock.asWriteLock().tryLock(0L, DAYS), |
292 |
> |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
293 |
> |
() -> lock.asReadLock().lockInterruptibly(), |
294 |
> |
() -> lock.asReadLock().tryLock(0L, DAYS), |
295 |
> |
() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS), |
296 |
> |
}; |
297 |
> |
shuffle(interruptibleLockActions); |
298 |
> |
|
299 |
> |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
300 |
> |
{ |
301 |
> |
long s = lock.writeLock(); |
302 |
> |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
303 |
> |
lock.unlockWrite(s); |
304 |
|
} |
305 |
+ |
{ |
306 |
+ |
long s = lock.readLock(); |
307 |
+ |
assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions); |
308 |
+ |
lock.unlockRead(s); |
309 |
+ |
} |
310 |
+ |
} |
311 |
+ |
|
312 |
+ |
void assertThrowInterruptedExceptionWhenInterrupted(Action[] actions) { |
313 |
+ |
int n = actions.length; |
314 |
+ |
Future<?>[] futures = new Future<?>[n]; |
315 |
+ |
CountDownLatch threadsStarted = new CountDownLatch(n); |
316 |
+ |
CountDownLatch done = new CountDownLatch(n); |
317 |
+ |
|
318 |
+ |
for (int i = 0; i < n; i++) { |
319 |
+ |
Action action = actions[i]; |
320 |
+ |
futures[i] = cachedThreadPool.submit(new CheckedRunnable() { |
321 |
+ |
public void realRun() throws Throwable { |
322 |
+ |
threadsStarted.countDown(); |
323 |
+ |
try { |
324 |
+ |
action.run(); |
325 |
+ |
shouldThrow(); |
326 |
+ |
} |
327 |
+ |
catch (InterruptedException success) {} |
328 |
+ |
catch (Throwable fail) { threadUnexpectedException(fail); } |
329 |
+ |
assertFalse(Thread.interrupted()); |
330 |
+ |
done.countDown(); |
331 |
+ |
}}); |
332 |
+ |
} |
333 |
+ |
|
334 |
+ |
await(threadsStarted); |
335 |
+ |
assertEquals(n, done.getCount()); |
336 |
+ |
for (Future<?> future : futures) // Interrupt all the tasks |
337 |
+ |
future.cancel(true); |
338 |
+ |
await(done); |
339 |
|
} |
340 |
|
|
341 |
|
/** |
342 |
< |
* timed tryWriteLock is interruptible |
342 |
> |
* interruptible operations throw InterruptedException when write locked and interrupted |
343 |
|
*/ |
344 |
< |
public void testWriteTryLock_Interruptible() { |
310 |
< |
final CountDownLatch running = new CountDownLatch(1); |
344 |
> |
public void testInterruptibleOperationsThrowInterruptedExceptionWriteLockedInterrupted() { |
345 |
|
final StampedLock lock = new StampedLock(); |
346 |
< |
long s = lock.writeLock(); |
347 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
348 |
< |
public void realRun() throws InterruptedException { |
349 |
< |
running.countDown(); |
350 |
< |
lock.tryWriteLock(2 * LONG_DELAY_MS, MILLISECONDS); |
351 |
< |
}}); |
352 |
< |
try { |
353 |
< |
running.await(); |
354 |
< |
waitForThreadToEnterWaitState(t, 100); |
355 |
< |
t.interrupt(); |
356 |
< |
awaitTermination(t); |
357 |
< |
releaseWriteLock(lock, s); |
358 |
< |
} catch (InterruptedException ie) { |
359 |
< |
threadUnexpectedException(ie); |
360 |
< |
} |
346 |
> |
long stamp = lock.writeLock(); |
347 |
> |
|
348 |
> |
Action[] interruptibleLockBlockingActions = { |
349 |
> |
() -> lock.writeLockInterruptibly(), |
350 |
> |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
351 |
> |
() -> lock.readLockInterruptibly(), |
352 |
> |
() -> lock.tryReadLock(Long.MAX_VALUE, DAYS), |
353 |
> |
() -> lock.asWriteLock().lockInterruptibly(), |
354 |
> |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
355 |
> |
() -> lock.asReadLock().lockInterruptibly(), |
356 |
> |
() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS), |
357 |
> |
}; |
358 |
> |
shuffle(interruptibleLockBlockingActions); |
359 |
> |
|
360 |
> |
assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions); |
361 |
> |
|
362 |
> |
releaseWriteLock(lock, stamp); |
363 |
|
} |
364 |
|
|
365 |
|
/** |
366 |
< |
* readLockInterruptibly is interruptible |
366 |
> |
* interruptible operations throw InterruptedException when read locked and interrupted |
367 |
|
*/ |
368 |
< |
public void testReadLockInterruptibly_Interruptible() { |
333 |
< |
final CountDownLatch running = new CountDownLatch(1); |
368 |
> |
public void testInterruptibleOperationsThrowInterruptedExceptionReadLockedInterrupted() { |
369 |
|
final StampedLock lock = new StampedLock(); |
370 |
< |
long s = lock.writeLock(); |
371 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
372 |
< |
public void realRun() throws InterruptedException { |
373 |
< |
running.countDown(); |
374 |
< |
lock.readLockInterruptibly(); |
375 |
< |
}}); |
376 |
< |
try { |
377 |
< |
running.await(); |
378 |
< |
waitForThreadToEnterWaitState(t, 100); |
379 |
< |
t.interrupt(); |
380 |
< |
awaitTermination(t); |
381 |
< |
releaseWriteLock(lock, s); |
382 |
< |
} catch (InterruptedException ie) { |
348 |
< |
threadUnexpectedException(ie); |
349 |
< |
} |
370 |
> |
long stamp = lock.readLock(); |
371 |
> |
|
372 |
> |
Action[] interruptibleLockBlockingActions = { |
373 |
> |
() -> lock.writeLockInterruptibly(), |
374 |
> |
() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS), |
375 |
> |
() -> lock.asWriteLock().lockInterruptibly(), |
376 |
> |
() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS), |
377 |
> |
}; |
378 |
> |
shuffle(interruptibleLockBlockingActions); |
379 |
> |
|
380 |
> |
assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions); |
381 |
> |
|
382 |
> |
releaseReadLock(lock, stamp); |
383 |
|
} |
384 |
|
|
385 |
|
/** |
386 |
< |
* timed tryReadLock is interruptible |
386 |
> |
* Non-interruptible operations ignore and preserve interrupt status |
387 |
|
*/ |
388 |
< |
public void testReadTryLock_Interruptible() { |
356 |
< |
final CountDownLatch running = new CountDownLatch(1); |
388 |
> |
public void testNonInterruptibleOperationsIgnoreInterrupts() { |
389 |
|
final StampedLock lock = new StampedLock(); |
390 |
< |
long s = lock.writeLock(); |
391 |
< |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
392 |
< |
public void realRun() throws InterruptedException { |
393 |
< |
running.countDown(); |
394 |
< |
lock.tryReadLock(2 * LONG_DELAY_MS, MILLISECONDS); |
395 |
< |
}}); |
396 |
< |
try { |
365 |
< |
running.await(); |
366 |
< |
waitForThreadToEnterWaitState(t, 100); |
367 |
< |
t.interrupt(); |
368 |
< |
awaitTermination(t); |
369 |
< |
releaseWriteLock(lock, s); |
370 |
< |
} catch (InterruptedException ie) { |
371 |
< |
threadUnexpectedException(ie); |
390 |
> |
Thread.currentThread().interrupt(); |
391 |
> |
|
392 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
393 |
> |
long s = assertValid(lock, lock.readLock()); |
394 |
> |
readUnlocker.accept(lock, s); |
395 |
> |
s = assertValid(lock, lock.tryReadLock()); |
396 |
> |
readUnlocker.accept(lock, s); |
397 |
|
} |
398 |
+ |
|
399 |
+ |
lock.asReadLock().lock(); |
400 |
+ |
lock.asReadLock().unlock(); |
401 |
+ |
|
402 |
+ |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
403 |
+ |
long s = assertValid(lock, lock.writeLock()); |
404 |
+ |
writeUnlocker.accept(lock, s); |
405 |
+ |
s = assertValid(lock, lock.tryWriteLock()); |
406 |
+ |
writeUnlocker.accept(lock, s); |
407 |
+ |
} |
408 |
+ |
|
409 |
+ |
lock.asWriteLock().lock(); |
410 |
+ |
lock.asWriteLock().unlock(); |
411 |
+ |
|
412 |
+ |
assertTrue(Thread.interrupted()); |
413 |
|
} |
414 |
|
|
415 |
|
/** |
416 |
|
* tryWriteLock on an unlocked lock succeeds |
417 |
|
*/ |
418 |
< |
public void testWriteTryLock() { |
418 |
> |
public void testTryWriteLock() { |
419 |
|
final StampedLock lock = new StampedLock(); |
420 |
|
long s = lock.tryWriteLock(); |
421 |
|
assertTrue(s != 0L); |
422 |
|
assertTrue(lock.isWriteLocked()); |
423 |
< |
long s2 = lock.tryWriteLock(); |
384 |
< |
assertEquals(s2, 0L); |
423 |
> |
assertEquals(0L, lock.tryWriteLock()); |
424 |
|
releaseWriteLock(lock, s); |
425 |
|
} |
426 |
|
|
427 |
|
/** |
428 |
|
* tryWriteLock fails if locked |
429 |
|
*/ |
430 |
< |
public void testWriteTryLockWhenLocked() { |
430 |
> |
public void testTryWriteLockWhenLocked() { |
431 |
|
final StampedLock lock = new StampedLock(); |
432 |
|
long s = lock.writeLock(); |
433 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
434 |
|
public void realRun() { |
435 |
< |
long ws = lock.tryWriteLock(); |
397 |
< |
assertTrue(ws == 0L); |
435 |
> |
assertEquals(0L, lock.tryWriteLock()); |
436 |
|
}}); |
437 |
|
|
438 |
+ |
assertEquals(0L, lock.tryWriteLock()); |
439 |
|
awaitTermination(t); |
440 |
|
releaseWriteLock(lock, s); |
441 |
|
} |
443 |
|
/** |
444 |
|
* tryReadLock fails if write-locked |
445 |
|
*/ |
446 |
< |
public void testReadTryLockWhenLocked() { |
446 |
> |
public void testTryReadLockWhenLocked() { |
447 |
|
final StampedLock lock = new StampedLock(); |
448 |
|
long s = lock.writeLock(); |
449 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
450 |
|
public void realRun() { |
451 |
< |
long rs = lock.tryReadLock(); |
413 |
< |
assertEquals(rs, 0L); |
451 |
> |
assertEquals(0L, lock.tryReadLock()); |
452 |
|
}}); |
453 |
|
|
454 |
+ |
assertEquals(0L, lock.tryReadLock()); |
455 |
|
awaitTermination(t); |
456 |
|
releaseWriteLock(lock, s); |
457 |
|
} |
465 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
466 |
|
public void realRun() throws InterruptedException { |
467 |
|
long s2 = lock.tryReadLock(); |
468 |
< |
assertTrue(s2 != 0L); |
468 |
> |
assertValid(lock, s2); |
469 |
|
lock.unlockRead(s2); |
470 |
|
long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS); |
471 |
< |
assertTrue(s3 != 0L); |
471 |
> |
assertValid(lock, s3); |
472 |
|
lock.unlockRead(s3); |
473 |
|
long s4 = lock.readLock(); |
474 |
+ |
assertValid(lock, s4); |
475 |
|
lock.unlockRead(s4); |
476 |
+ |
lock.asReadLock().lock(); |
477 |
+ |
lock.asReadLock().unlock(); |
478 |
+ |
lock.asReadLock().lockInterruptibly(); |
479 |
+ |
lock.asReadLock().unlock(); |
480 |
+ |
lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS); |
481 |
+ |
lock.asReadLock().unlock(); |
482 |
|
}}); |
483 |
|
|
484 |
|
awaitTermination(t); |
486 |
|
} |
487 |
|
|
488 |
|
/** |
489 |
< |
* A writelock succeeds only after a reading thread unlocks |
489 |
> |
* writeLock() succeeds only after a reading thread unlocks |
490 |
|
*/ |
491 |
< |
public void testWriteAfterReadLock() { |
492 |
< |
final CountDownLatch running = new CountDownLatch(1); |
491 |
> |
public void testWriteAfterReadLock() throws InterruptedException { |
492 |
> |
final CountDownLatch aboutToLock = new CountDownLatch(1); |
493 |
|
final StampedLock lock = new StampedLock(); |
494 |
|
long rs = lock.readLock(); |
495 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
496 |
|
public void realRun() { |
497 |
< |
running.countDown(); |
497 |
> |
aboutToLock.countDown(); |
498 |
|
long s = lock.writeLock(); |
499 |
+ |
assertTrue(lock.isWriteLocked()); |
500 |
+ |
assertFalse(lock.isReadLocked()); |
501 |
|
lock.unlockWrite(s); |
502 |
|
}}); |
503 |
< |
try { |
504 |
< |
running.await(); |
505 |
< |
waitForThreadToEnterWaitState(t, 100); |
506 |
< |
assertFalse(lock.isWriteLocked()); |
507 |
< |
lock.unlockRead(rs); |
508 |
< |
awaitTermination(t); |
509 |
< |
assertFalse(lock.isWriteLocked()); |
510 |
< |
} catch (InterruptedException ie) { |
463 |
< |
threadUnexpectedException(ie); |
464 |
< |
} |
503 |
> |
|
504 |
> |
await(aboutToLock); |
505 |
> |
assertThreadBlocks(t, Thread.State.WAITING); |
506 |
> |
assertFalse(lock.isWriteLocked()); |
507 |
> |
assertTrue(lock.isReadLocked()); |
508 |
> |
lock.unlockRead(rs); |
509 |
> |
awaitTermination(t); |
510 |
> |
assertUnlocked(lock); |
511 |
|
} |
512 |
|
|
513 |
|
/** |
514 |
< |
* A writelock succeeds only after reading threads unlock |
514 |
> |
* writeLock() succeeds only after reading threads unlock |
515 |
|
*/ |
516 |
|
public void testWriteAfterMultipleReadLocks() { |
517 |
|
final StampedLock lock = new StampedLock(); |
521 |
|
long rs = lock.readLock(); |
522 |
|
lock.unlockRead(rs); |
523 |
|
}}); |
524 |
+ |
|
525 |
|
awaitTermination(t1); |
526 |
|
|
527 |
|
Thread t2 = newStartedThread(new CheckedRunnable() { |
529 |
|
long ws = lock.writeLock(); |
530 |
|
lock.unlockWrite(ws); |
531 |
|
}}); |
532 |
+ |
|
533 |
+ |
assertTrue(lock.isReadLocked()); |
534 |
|
assertFalse(lock.isWriteLocked()); |
535 |
|
lock.unlockRead(s); |
536 |
|
awaitTermination(t2); |
537 |
< |
assertFalse(lock.isWriteLocked()); |
537 |
> |
assertUnlocked(lock); |
538 |
|
} |
539 |
|
|
540 |
|
/** |
541 |
< |
* Readlocks succeed only after a writing thread unlocks |
541 |
> |
* readLock() succeed only after a writing thread unlocks |
542 |
|
*/ |
543 |
|
public void testReadAfterWriteLock() { |
544 |
|
final StampedLock lock = new StampedLock(); |
545 |
+ |
final CountDownLatch threadsStarted = new CountDownLatch(2); |
546 |
|
final long s = lock.writeLock(); |
547 |
< |
Thread t1 = newStartedThread(new CheckedRunnable() { |
547 |
> |
final Runnable acquireReleaseReadLock = new CheckedRunnable() { |
548 |
|
public void realRun() { |
549 |
+ |
threadsStarted.countDown(); |
550 |
|
long rs = lock.readLock(); |
551 |
+ |
assertTrue(lock.isReadLocked()); |
552 |
+ |
assertFalse(lock.isWriteLocked()); |
553 |
|
lock.unlockRead(rs); |
554 |
< |
}}); |
555 |
< |
Thread t2 = newStartedThread(new CheckedRunnable() { |
556 |
< |
public void realRun() { |
557 |
< |
long rs = lock.readLock(); |
558 |
< |
lock.unlockRead(rs); |
559 |
< |
}}); |
560 |
< |
|
554 |
> |
}}; |
555 |
> |
Thread t1 = newStartedThread(acquireReleaseReadLock); |
556 |
> |
Thread t2 = newStartedThread(acquireReleaseReadLock); |
557 |
> |
|
558 |
> |
await(threadsStarted); |
559 |
> |
assertThreadBlocks(t1, Thread.State.WAITING); |
560 |
> |
assertThreadBlocks(t2, Thread.State.WAITING); |
561 |
> |
assertTrue(lock.isWriteLocked()); |
562 |
> |
assertFalse(lock.isReadLocked()); |
563 |
|
releaseWriteLock(lock, s); |
564 |
|
awaitTermination(t1); |
565 |
|
awaitTermination(t2); |
566 |
+ |
assertUnlocked(lock); |
567 |
|
} |
568 |
|
|
569 |
|
/** |
570 |
< |
* tryReadLock succeeds if readlocked but not writelocked |
570 |
> |
* tryReadLock succeeds if read locked but not write locked |
571 |
|
*/ |
572 |
|
public void testTryLockWhenReadLocked() { |
573 |
|
final StampedLock lock = new StampedLock(); |
575 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
576 |
|
public void realRun() { |
577 |
|
long rs = lock.tryReadLock(); |
578 |
< |
threadAssertTrue(rs != 0L); |
578 |
> |
assertValid(lock, rs); |
579 |
|
lock.unlockRead(rs); |
580 |
|
}}); |
581 |
|
|
584 |
|
} |
585 |
|
|
586 |
|
/** |
587 |
< |
* tryWriteLock fails when readlocked |
587 |
> |
* tryWriteLock fails when read locked |
588 |
|
*/ |
589 |
< |
public void testWriteTryLockWhenReadLocked() { |
589 |
> |
public void testTryWriteLockWhenReadLocked() { |
590 |
|
final StampedLock lock = new StampedLock(); |
591 |
|
long s = lock.readLock(); |
592 |
|
Thread t = newStartedThread(new CheckedRunnable() { |
593 |
|
public void realRun() { |
594 |
< |
long ws = lock.tryWriteLock(); |
539 |
< |
threadAssertEquals(ws, 0L); |
594 |
> |
assertEquals(0L, lock.tryWriteLock()); |
595 |
|
}}); |
596 |
|
|
597 |
|
awaitTermination(t); |
599 |
|
} |
600 |
|
|
601 |
|
/** |
602 |
< |
* timed tryWriteLock times out if locked |
602 |
> |
* timed lock operations time out if lock not available |
603 |
|
*/ |
604 |
< |
public void testWriteTryLock_Timeout() { |
604 |
> |
public void testTimedLock_Timeout() throws Exception { |
605 |
> |
ArrayList<Future<?>> futures = new ArrayList<>(); |
606 |
> |
|
607 |
> |
// Write locked |
608 |
|
final StampedLock lock = new StampedLock(); |
609 |
< |
long s = lock.writeLock(); |
610 |
< |
Thread t = newStartedThread(new CheckedRunnable() { |
609 |
> |
long stamp = lock.writeLock(); |
610 |
> |
assertEquals(0L, lock.tryReadLock(0L, DAYS)); |
611 |
> |
assertEquals(0L, lock.tryReadLock(Long.MIN_VALUE, DAYS)); |
612 |
> |
assertFalse(lock.asReadLock().tryLock(0L, DAYS)); |
613 |
> |
assertFalse(lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS)); |
614 |
> |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
615 |
> |
assertEquals(0L, lock.tryWriteLock(Long.MIN_VALUE, DAYS)); |
616 |
> |
assertFalse(lock.asWriteLock().tryLock(0L, DAYS)); |
617 |
> |
assertFalse(lock.asWriteLock().tryLock(Long.MIN_VALUE, DAYS)); |
618 |
> |
|
619 |
> |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
620 |
|
public void realRun() throws InterruptedException { |
621 |
|
long startTime = System.nanoTime(); |
622 |
< |
long timeoutMillis = 10; |
623 |
< |
long ws = lock.tryWriteLock(timeoutMillis, MILLISECONDS); |
624 |
< |
assertEquals(ws, 0L); |
558 |
< |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
559 |
< |
}}); |
622 |
> |
assertEquals(0L, lock.tryWriteLock(timeoutMillis(), MILLISECONDS)); |
623 |
> |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
624 |
> |
}})); |
625 |
|
|
626 |
< |
awaitTermination(t); |
627 |
< |
releaseWriteLock(lock, s); |
628 |
< |
} |
626 |
> |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
627 |
> |
public void realRun() throws InterruptedException { |
628 |
> |
long startTime = System.nanoTime(); |
629 |
> |
assertEquals(0L, lock.tryReadLock(timeoutMillis(), MILLISECONDS)); |
630 |
> |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
631 |
> |
}})); |
632 |
> |
|
633 |
> |
// Read locked |
634 |
> |
final StampedLock lock2 = new StampedLock(); |
635 |
> |
long stamp2 = lock2.readLock(); |
636 |
> |
assertEquals(0L, lock2.tryWriteLock(0L, DAYS)); |
637 |
> |
assertEquals(0L, lock2.tryWriteLock(Long.MIN_VALUE, DAYS)); |
638 |
> |
assertFalse(lock2.asWriteLock().tryLock(0L, DAYS)); |
639 |
> |
assertFalse(lock2.asWriteLock().tryLock(Long.MIN_VALUE, DAYS)); |
640 |
|
|
641 |
< |
/** |
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() { |
641 |
> |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
642 |
|
public void realRun() throws InterruptedException { |
643 |
|
long startTime = System.nanoTime(); |
644 |
< |
long timeoutMillis = 10; |
645 |
< |
long rs = lock.tryReadLock(timeoutMillis, MILLISECONDS); |
646 |
< |
assertEquals(rs, 0L); |
577 |
< |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
578 |
< |
}}); |
644 |
> |
assertEquals(0L, lock2.tryWriteLock(timeoutMillis(), MILLISECONDS)); |
645 |
> |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
646 |
> |
}})); |
647 |
|
|
648 |
< |
awaitTermination(t); |
649 |
< |
assertTrue(lock.isWriteLocked()); |
650 |
< |
lock.unlockWrite(s); |
648 |
> |
for (Future<?> future : futures) |
649 |
> |
assertNull(future.get()); |
650 |
> |
|
651 |
> |
releaseWriteLock(lock, stamp); |
652 |
> |
releaseReadLock(lock2, stamp2); |
653 |
|
} |
654 |
|
|
655 |
|
/** |
656 |
< |
* writeLockInterruptibly succeeds if unlocked, else is interruptible |
656 |
> |
* writeLockInterruptibly succeeds if unlocked |
657 |
|
*/ |
658 |
< |
public void testWriteLockInterruptibly() { |
589 |
< |
final CountDownLatch running = new CountDownLatch(1); |
658 |
> |
public void testWriteLockInterruptibly() throws InterruptedException { |
659 |
|
final StampedLock lock = new StampedLock(); |
660 |
< |
long s = 0L; |
661 |
< |
try { |
662 |
< |
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 |
< |
|
660 |
> |
long s = lock.writeLockInterruptibly(); |
661 |
> |
assertTrue(lock.isWriteLocked()); |
662 |
> |
releaseWriteLock(lock, s); |
663 |
|
} |
664 |
|
|
665 |
|
/** |
666 |
< |
* readLockInterruptibly succeeds if lock free else is interruptible |
666 |
> |
* readLockInterruptibly succeeds if lock free |
667 |
|
*/ |
668 |
< |
public void testReadLockInterruptibly() { |
620 |
< |
final CountDownLatch running = new CountDownLatch(1); |
668 |
> |
public void testReadLockInterruptibly() throws InterruptedException { |
669 |
|
final StampedLock lock = new StampedLock(); |
670 |
< |
long s = 0L; |
671 |
< |
try { |
672 |
< |
s = lock.readLockInterruptibly(); |
673 |
< |
lock.unlockRead(s); |
674 |
< |
s = lock.writeLockInterruptibly(); |
675 |
< |
} catch (InterruptedException ie) { |
676 |
< |
threadUnexpectedException(ie); |
677 |
< |
} |
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 |
< |
} |
670 |
> |
|
671 |
> |
long s = assertValid(lock, lock.readLockInterruptibly()); |
672 |
> |
assertTrue(lock.isReadLocked()); |
673 |
> |
lock.unlockRead(s); |
674 |
> |
|
675 |
> |
lock.asReadLock().lockInterruptibly(); |
676 |
> |
assertTrue(lock.isReadLocked()); |
677 |
> |
lock.asReadLock().unlock(); |
678 |
|
} |
679 |
|
|
680 |
|
/** |
703 |
|
lock.unlockWrite(s); |
704 |
|
s = lock.readLock(); |
705 |
|
assertTrue(lock.toString().contains("Read-locks")); |
706 |
+ |
releaseReadLock(lock, s); |
707 |
|
} |
708 |
|
|
709 |
|
/** |
710 |
< |
* tryOptimisticRead succeeds and validates if unlocked, fails if locked |
710 |
> |
* tryOptimisticRead succeeds and validates if unlocked, fails if |
711 |
> |
* exclusively locked |
712 |
|
*/ |
713 |
< |
public void testValidateOptimistic() { |
714 |
< |
try { |
715 |
< |
StampedLock lock = new StampedLock(); |
716 |
< |
long s, p; |
717 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
718 |
< |
assertTrue(lock.validate(p)); |
719 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
720 |
< |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
721 |
< |
assertTrue(lock.validate(s)); |
722 |
< |
lock.unlockWrite(s); |
723 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
724 |
< |
assertTrue(lock.validate(p)); |
725 |
< |
assertTrue((s = lock.readLock()) != 0L); |
726 |
< |
assertTrue(lock.validate(s)); |
727 |
< |
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); |
713 |
> |
public void testValidateOptimistic() throws InterruptedException { |
714 |
> |
StampedLock lock = new StampedLock(); |
715 |
> |
|
716 |
> |
assertValid(lock, lock.tryOptimisticRead()); |
717 |
> |
|
718 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
719 |
> |
long s = assertValid(lock, writeLocker.apply(lock)); |
720 |
> |
assertEquals(0L, lock.tryOptimisticRead()); |
721 |
> |
releaseWriteLock(lock, s); |
722 |
> |
} |
723 |
> |
|
724 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
725 |
> |
long s = assertValid(lock, readLocker.apply(lock)); |
726 |
> |
long p = assertValid(lock, lock.tryOptimisticRead()); |
727 |
> |
releaseReadLock(lock, s); |
728 |
|
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); |
729 |
|
} |
730 |
+ |
|
731 |
+ |
assertValid(lock, lock.tryOptimisticRead()); |
732 |
|
} |
733 |
|
|
734 |
|
/** |
735 |
|
* tryOptimisticRead stamp does not validate if a write lock intervenes |
736 |
|
*/ |
737 |
|
public void testValidateOptimisticWriteLocked() { |
738 |
< |
StampedLock lock = new StampedLock(); |
739 |
< |
long s, p; |
740 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
724 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
738 |
> |
final StampedLock lock = new StampedLock(); |
739 |
> |
final long p = assertValid(lock, lock.tryOptimisticRead()); |
740 |
> |
final long s = assertValid(lock, lock.writeLock()); |
741 |
|
assertFalse(lock.validate(p)); |
742 |
< |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
742 |
> |
assertEquals(0L, lock.tryOptimisticRead()); |
743 |
|
assertTrue(lock.validate(s)); |
744 |
|
lock.unlockWrite(s); |
745 |
|
} |
748 |
|
* tryOptimisticRead stamp does not validate if a write lock |
749 |
|
* intervenes in another thread |
750 |
|
*/ |
751 |
< |
public void testValidateOptimisticWriteLocked2() { |
752 |
< |
final CountDownLatch running = new CountDownLatch(1); |
751 |
> |
public void testValidateOptimisticWriteLocked2() |
752 |
> |
throws InterruptedException { |
753 |
> |
final CountDownLatch locked = new CountDownLatch(1); |
754 |
|
final StampedLock lock = new StampedLock(); |
755 |
< |
long s, p; |
756 |
< |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
755 |
> |
final long p = assertValid(lock, lock.tryOptimisticRead()); |
756 |
> |
|
757 |
|
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
758 |
< |
public void realRun() throws InterruptedException { |
759 |
< |
lock.writeLockInterruptibly(); |
760 |
< |
running.countDown(); |
761 |
< |
lock.writeLockInterruptibly(); |
762 |
< |
}}); |
763 |
< |
try { |
764 |
< |
running.await(); |
765 |
< |
assertFalse(lock.validate(p)); |
766 |
< |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
767 |
< |
t.interrupt(); |
768 |
< |
awaitTermination(t); |
769 |
< |
} catch (InterruptedException ie) { |
770 |
< |
threadUnexpectedException(ie); |
754 |
< |
} |
758 |
> |
public void realRun() throws InterruptedException { |
759 |
> |
lock.writeLockInterruptibly(); |
760 |
> |
locked.countDown(); |
761 |
> |
lock.writeLockInterruptibly(); |
762 |
> |
}}); |
763 |
> |
|
764 |
> |
await(locked); |
765 |
> |
assertFalse(lock.validate(p)); |
766 |
> |
assertEquals(0L, lock.tryOptimisticRead()); |
767 |
> |
assertThreadBlocks(t, Thread.State.WAITING); |
768 |
> |
t.interrupt(); |
769 |
> |
awaitTermination(t); |
770 |
> |
assertTrue(lock.isWriteLocked()); |
771 |
|
} |
772 |
|
|
773 |
|
/** |
774 |
< |
* tryConvertToOptimisticRead succeeds and validates if successfully locked, |
774 |
> |
* tryConvertToOptimisticRead succeeds and validates if successfully locked |
775 |
|
*/ |
776 |
< |
public void testTryConvertToOptimisticRead() { |
777 |
< |
try { |
778 |
< |
StampedLock lock = new StampedLock(); |
779 |
< |
long s, p; |
780 |
< |
s = 0L; |
781 |
< |
assertFalse((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
782 |
< |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
783 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
784 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
785 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
786 |
< |
assertTrue(lock.validate(p)); |
787 |
< |
assertTrue((s = lock.readLock()) != 0L); |
788 |
< |
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); |
776 |
> |
public void testTryConvertToOptimisticRead() throws InterruptedException { |
777 |
> |
StampedLock lock = new StampedLock(); |
778 |
> |
long s, p, q; |
779 |
> |
assertEquals(0L, lock.tryConvertToOptimisticRead(0L)); |
780 |
> |
|
781 |
> |
s = assertValid(lock, lock.tryOptimisticRead()); |
782 |
> |
assertEquals(s, lock.tryConvertToOptimisticRead(s)); |
783 |
> |
assertTrue(lock.validate(s)); |
784 |
> |
|
785 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
786 |
> |
s = assertValid(lock, writeLocker.apply(lock)); |
787 |
> |
p = assertValid(lock, lock.tryConvertToOptimisticRead(s)); |
788 |
> |
assertFalse(lock.validate(s)); |
789 |
|
assertTrue(lock.validate(p)); |
790 |
< |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
791 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
790 |
> |
assertUnlocked(lock); |
791 |
> |
} |
792 |
> |
|
793 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
794 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
795 |
> |
q = assertValid(lock, lock.tryOptimisticRead()); |
796 |
> |
assertEquals(q, lock.tryConvertToOptimisticRead(q)); |
797 |
> |
assertTrue(lock.validate(q)); |
798 |
> |
assertTrue(lock.isReadLocked()); |
799 |
> |
p = assertValid(lock, lock.tryConvertToOptimisticRead(s)); |
800 |
|
assertTrue(lock.validate(p)); |
786 |
– |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
801 |
|
assertTrue(lock.validate(s)); |
802 |
< |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
803 |
< |
assertTrue(lock.validate(p)); |
804 |
< |
} catch (InterruptedException ie) { |
791 |
< |
threadUnexpectedException(ie); |
802 |
> |
assertUnlocked(lock); |
803 |
> |
assertEquals(q, lock.tryConvertToOptimisticRead(q)); |
804 |
> |
assertTrue(lock.validate(q)); |
805 |
|
} |
806 |
|
} |
807 |
|
|
808 |
|
/** |
809 |
< |
* tryConvertToReadLock succeeds and validates if successfully locked |
797 |
< |
* or lock free; |
809 |
> |
* tryConvertToReadLock succeeds for valid stamps |
810 |
|
*/ |
811 |
< |
public void testTryConvertToReadLock() { |
812 |
< |
try { |
813 |
< |
StampedLock lock = new StampedLock(); |
814 |
< |
long s, p; |
815 |
< |
s = 0L; |
816 |
< |
assertFalse((p = lock.tryConvertToReadLock(s)) != 0L); |
817 |
< |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
818 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
819 |
< |
lock.unlockRead(p); |
820 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
821 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
822 |
< |
assertTrue(lock.validate(p)); |
823 |
< |
lock.unlockRead(p); |
824 |
< |
assertTrue((s = lock.readLock()) != 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()) != 0L); |
830 |
< |
assertTrue(lock.validate(s)); |
831 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
832 |
< |
assertTrue(lock.validate(p)); |
833 |
< |
lock.unlockRead(p); |
834 |
< |
assertTrue((s = lock.tryReadLock()) != 0L); |
835 |
< |
assertTrue(lock.validate(s)); |
836 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
837 |
< |
assertTrue(lock.validate(p)); |
838 |
< |
lock.unlockRead(p); |
839 |
< |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
840 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
841 |
< |
assertTrue(lock.validate(p)); |
842 |
< |
lock.unlockRead(p); |
843 |
< |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
844 |
< |
assertTrue(lock.validate(s)); |
845 |
< |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
846 |
< |
assertTrue(lock.validate(p)); |
847 |
< |
lock.unlockRead(p); |
848 |
< |
} catch (InterruptedException ie) { |
849 |
< |
threadUnexpectedException(ie); |
811 |
> |
public void testTryConvertToReadLock() throws InterruptedException { |
812 |
> |
StampedLock lock = new StampedLock(); |
813 |
> |
long s, p; |
814 |
> |
|
815 |
> |
assertEquals(0L, lock.tryConvertToReadLock(0L)); |
816 |
> |
|
817 |
> |
s = assertValid(lock, lock.tryOptimisticRead()); |
818 |
> |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
819 |
> |
assertTrue(lock.isReadLocked()); |
820 |
> |
assertEquals(1, lock.getReadLockCount()); |
821 |
> |
assertTrue(lock.validate(s)); |
822 |
> |
lock.unlockRead(p); |
823 |
> |
|
824 |
> |
s = assertValid(lock, lock.tryOptimisticRead()); |
825 |
> |
lock.readLock(); |
826 |
> |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
827 |
> |
assertTrue(lock.isReadLocked()); |
828 |
> |
assertEquals(2, lock.getReadLockCount()); |
829 |
> |
lock.unlockRead(p); |
830 |
> |
lock.unlockRead(p); |
831 |
> |
assertUnlocked(lock); |
832 |
> |
|
833 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
834 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
835 |
> |
s = assertValid(lock, writeLocker.apply(lock)); |
836 |
> |
p = assertValid(lock, lock.tryConvertToReadLock(s)); |
837 |
> |
assertFalse(lock.validate(s)); |
838 |
> |
assertTrue(lock.isReadLocked()); |
839 |
> |
assertEquals(1, lock.getReadLockCount()); |
840 |
> |
readUnlocker.accept(lock, p); |
841 |
> |
} |
842 |
> |
|
843 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
844 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
845 |
> |
assertEquals(s, lock.tryConvertToReadLock(s)); |
846 |
> |
assertTrue(lock.validate(s)); |
847 |
> |
assertTrue(lock.isReadLocked()); |
848 |
> |
assertEquals(1, lock.getReadLockCount()); |
849 |
> |
readUnlocker.accept(lock, s); |
850 |
> |
} |
851 |
|
} |
852 |
|
} |
853 |
|
|
854 |
|
/** |
855 |
< |
* tryConvertToWriteLock succeeds and validates if successfully locked |
843 |
< |
* or lock free; |
855 |
> |
* tryConvertToWriteLock succeeds if lock available; fails if multiply read locked |
856 |
|
*/ |
857 |
< |
public void testTryConvertToWriteLock() { |
858 |
< |
try { |
859 |
< |
StampedLock lock = new StampedLock(); |
860 |
< |
long s, p; |
861 |
< |
s = 0L; |
862 |
< |
assertFalse((p = lock.tryConvertToWriteLock(s)) != 0L); |
863 |
< |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
864 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
865 |
< |
lock.unlockWrite(p); |
866 |
< |
assertTrue((s = lock.writeLock()) != 0L); |
867 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
868 |
< |
assertTrue(lock.validate(p)); |
869 |
< |
lock.unlockWrite(p); |
870 |
< |
assertTrue((s = lock.readLock()) != 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()) != 0L); |
876 |
< |
assertTrue(lock.validate(s)); |
877 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
878 |
< |
assertTrue(lock.validate(p)); |
879 |
< |
lock.unlockWrite(p); |
880 |
< |
assertTrue((s = lock.tryReadLock()) != 0L); |
881 |
< |
assertTrue(lock.validate(s)); |
882 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
883 |
< |
assertTrue(lock.validate(p)); |
884 |
< |
lock.unlockWrite(p); |
885 |
< |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
886 |
< |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
887 |
< |
assertTrue(lock.validate(p)); |
888 |
< |
lock.unlockWrite(p); |
889 |
< |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
857 |
> |
public void testTryConvertToWriteLock() throws InterruptedException { |
858 |
> |
StampedLock lock = new StampedLock(); |
859 |
> |
long s, p; |
860 |
> |
|
861 |
> |
assertEquals(0L, lock.tryConvertToWriteLock(0L)); |
862 |
> |
|
863 |
> |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
864 |
> |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
865 |
> |
assertTrue(lock.isWriteLocked()); |
866 |
> |
lock.unlockWrite(p); |
867 |
> |
|
868 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
869 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) { |
870 |
> |
s = assertValid(lock, writeLocker.apply(lock)); |
871 |
> |
assertEquals(s, lock.tryConvertToWriteLock(s)); |
872 |
> |
assertTrue(lock.validate(s)); |
873 |
> |
assertTrue(lock.isWriteLocked()); |
874 |
> |
writeUnlocker.accept(lock, s); |
875 |
> |
} |
876 |
> |
|
877 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
878 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
879 |
> |
p = assertValid(lock, lock.tryConvertToWriteLock(s)); |
880 |
> |
assertFalse(lock.validate(s)); |
881 |
> |
assertTrue(lock.validate(p)); |
882 |
> |
assertTrue(lock.isWriteLocked()); |
883 |
> |
writeUnlocker.accept(lock, p); |
884 |
> |
} |
885 |
> |
} |
886 |
> |
|
887 |
> |
// failure if multiply read locked |
888 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) { |
889 |
> |
s = assertValid(lock, readLocker.apply(lock)); |
890 |
> |
p = assertValid(lock, readLocker.apply(lock)); |
891 |
> |
assertEquals(0L, lock.tryConvertToWriteLock(s)); |
892 |
|
assertTrue(lock.validate(s)); |
879 |
– |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
893 |
|
assertTrue(lock.validate(p)); |
894 |
< |
lock.unlockWrite(p); |
895 |
< |
} catch (InterruptedException ie) { |
896 |
< |
threadUnexpectedException(ie); |
894 |
> |
assertEquals(2, lock.getReadLockCount()); |
895 |
> |
lock.unlock(p); |
896 |
> |
lock.unlock(s); |
897 |
> |
assertUnlocked(lock); |
898 |
|
} |
899 |
|
} |
900 |
|
|
901 |
|
/** |
902 |
|
* asWriteLock can be locked and unlocked |
903 |
|
*/ |
904 |
< |
public void testAsWriteLock() { |
904 |
> |
public void testAsWriteLock() throws Throwable { |
905 |
|
StampedLock sl = new StampedLock(); |
906 |
|
Lock lock = sl.asWriteLock(); |
907 |
< |
lock.lock(); |
908 |
< |
assertFalse(lock.tryLock()); |
909 |
< |
lock.unlock(); |
910 |
< |
assertTrue(lock.tryLock()); |
907 |
> |
for (Action locker : lockLockers(lock)) { |
908 |
> |
locker.run(); |
909 |
> |
assertTrue(sl.isWriteLocked()); |
910 |
> |
assertFalse(sl.isReadLocked()); |
911 |
> |
assertFalse(lock.tryLock()); |
912 |
> |
lock.unlock(); |
913 |
> |
assertUnlocked(sl); |
914 |
> |
} |
915 |
|
} |
916 |
|
|
917 |
|
/** |
918 |
|
* asReadLock can be locked and unlocked |
919 |
|
*/ |
920 |
< |
public void testAsReadLock() { |
920 |
> |
public void testAsReadLock() throws Throwable { |
921 |
|
StampedLock sl = new StampedLock(); |
922 |
|
Lock lock = sl.asReadLock(); |
923 |
< |
lock.lock(); |
924 |
< |
lock.unlock(); |
925 |
< |
assertTrue(lock.tryLock()); |
923 |
> |
for (Action locker : lockLockers(lock)) { |
924 |
> |
locker.run(); |
925 |
> |
assertTrue(sl.isReadLocked()); |
926 |
> |
assertFalse(sl.isWriteLocked()); |
927 |
> |
assertEquals(1, sl.getReadLockCount()); |
928 |
> |
locker.run(); |
929 |
> |
assertTrue(sl.isReadLocked()); |
930 |
> |
assertEquals(2, sl.getReadLockCount()); |
931 |
> |
lock.unlock(); |
932 |
> |
lock.unlock(); |
933 |
> |
assertUnlocked(sl); |
934 |
> |
} |
935 |
|
} |
936 |
|
|
937 |
|
/** |
938 |
|
* asReadWriteLock.writeLock can be locked and unlocked |
939 |
|
*/ |
940 |
< |
public void testAsReadWriteLockWriteLock() { |
940 |
> |
public void testAsReadWriteLockWriteLock() throws Throwable { |
941 |
|
StampedLock sl = new StampedLock(); |
942 |
|
Lock lock = sl.asReadWriteLock().writeLock(); |
943 |
< |
lock.lock(); |
944 |
< |
assertFalse(lock.tryLock()); |
945 |
< |
lock.unlock(); |
946 |
< |
assertTrue(lock.tryLock()); |
943 |
> |
for (Action locker : lockLockers(lock)) { |
944 |
> |
locker.run(); |
945 |
> |
assertTrue(sl.isWriteLocked()); |
946 |
> |
assertFalse(sl.isReadLocked()); |
947 |
> |
assertFalse(lock.tryLock()); |
948 |
> |
lock.unlock(); |
949 |
> |
assertUnlocked(sl); |
950 |
> |
} |
951 |
|
} |
952 |
|
|
953 |
|
/** |
954 |
|
* asReadWriteLock.readLock can be locked and unlocked |
955 |
|
*/ |
956 |
< |
public void testAsReadWriteLockReadLock() { |
956 |
> |
public void testAsReadWriteLockReadLock() throws Throwable { |
957 |
|
StampedLock sl = new StampedLock(); |
958 |
|
Lock lock = sl.asReadWriteLock().readLock(); |
959 |
< |
lock.lock(); |
960 |
< |
lock.unlock(); |
961 |
< |
assertTrue(lock.tryLock()); |
959 |
> |
for (Action locker : lockLockers(lock)) { |
960 |
> |
locker.run(); |
961 |
> |
assertTrue(sl.isReadLocked()); |
962 |
> |
assertFalse(sl.isWriteLocked()); |
963 |
> |
assertEquals(1, sl.getReadLockCount()); |
964 |
> |
locker.run(); |
965 |
> |
assertTrue(sl.isReadLocked()); |
966 |
> |
assertEquals(2, sl.getReadLockCount()); |
967 |
> |
lock.unlock(); |
968 |
> |
lock.unlock(); |
969 |
> |
assertUnlocked(sl); |
970 |
> |
} |
971 |
> |
} |
972 |
> |
|
973 |
> |
/** |
974 |
> |
* Lock.newCondition throws UnsupportedOperationException |
975 |
> |
*/ |
976 |
> |
public void testLockViewsDoNotSupportConditions() { |
977 |
> |
StampedLock sl = new StampedLock(); |
978 |
> |
assertThrows(UnsupportedOperationException.class, |
979 |
> |
() -> sl.asWriteLock().newCondition(), |
980 |
> |
() -> sl.asReadLock().newCondition(), |
981 |
> |
() -> sl.asReadWriteLock().writeLock().newCondition(), |
982 |
> |
() -> sl.asReadWriteLock().readLock().newCondition()); |
983 |
> |
} |
984 |
> |
|
985 |
> |
/** |
986 |
> |
* Passing optimistic read stamps to unlock operations result in |
987 |
> |
* IllegalMonitorStateException |
988 |
> |
*/ |
989 |
> |
public void testCannotUnlockOptimisticReadStamps() { |
990 |
> |
{ |
991 |
> |
StampedLock sl = new StampedLock(); |
992 |
> |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
993 |
> |
assertThrows(IllegalMonitorStateException.class, |
994 |
> |
() -> sl.unlockRead(stamp)); |
995 |
> |
} |
996 |
> |
{ |
997 |
> |
StampedLock sl = new StampedLock(); |
998 |
> |
long stamp = sl.tryOptimisticRead(); |
999 |
> |
assertThrows(IllegalMonitorStateException.class, |
1000 |
> |
() -> sl.unlock(stamp)); |
1001 |
> |
} |
1002 |
> |
|
1003 |
> |
{ |
1004 |
> |
StampedLock sl = new StampedLock(); |
1005 |
> |
long stamp = sl.tryOptimisticRead(); |
1006 |
> |
sl.writeLock(); |
1007 |
> |
assertThrows(IllegalMonitorStateException.class, |
1008 |
> |
() -> sl.unlock(stamp)); |
1009 |
> |
} |
1010 |
> |
{ |
1011 |
> |
StampedLock sl = new StampedLock(); |
1012 |
> |
sl.readLock(); |
1013 |
> |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
1014 |
> |
assertThrows(IllegalMonitorStateException.class, |
1015 |
> |
() -> sl.unlockRead(stamp)); |
1016 |
> |
} |
1017 |
> |
{ |
1018 |
> |
StampedLock sl = new StampedLock(); |
1019 |
> |
sl.readLock(); |
1020 |
> |
long stamp = assertValid(sl, sl.tryOptimisticRead()); |
1021 |
> |
assertThrows(IllegalMonitorStateException.class, |
1022 |
> |
() -> sl.unlock(stamp)); |
1023 |
> |
} |
1024 |
> |
|
1025 |
> |
{ |
1026 |
> |
StampedLock sl = new StampedLock(); |
1027 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1028 |
> |
assertValid(sl, stamp); |
1029 |
> |
sl.writeLock(); |
1030 |
> |
assertThrows(IllegalMonitorStateException.class, |
1031 |
> |
() -> sl.unlockWrite(stamp)); |
1032 |
> |
} |
1033 |
> |
{ |
1034 |
> |
StampedLock sl = new StampedLock(); |
1035 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1036 |
> |
sl.writeLock(); |
1037 |
> |
assertThrows(IllegalMonitorStateException.class, |
1038 |
> |
() -> sl.unlock(stamp)); |
1039 |
> |
} |
1040 |
> |
{ |
1041 |
> |
StampedLock sl = new StampedLock(); |
1042 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1043 |
> |
sl.readLock(); |
1044 |
> |
assertThrows(IllegalMonitorStateException.class, |
1045 |
> |
() -> sl.unlockRead(stamp)); |
1046 |
> |
} |
1047 |
> |
{ |
1048 |
> |
StampedLock sl = new StampedLock(); |
1049 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.writeLock()); |
1050 |
> |
sl.readLock(); |
1051 |
> |
assertThrows(IllegalMonitorStateException.class, |
1052 |
> |
() -> sl.unlock(stamp)); |
1053 |
> |
} |
1054 |
> |
|
1055 |
> |
{ |
1056 |
> |
StampedLock sl = new StampedLock(); |
1057 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1058 |
> |
assertValid(sl, stamp); |
1059 |
> |
sl.writeLock(); |
1060 |
> |
assertThrows(IllegalMonitorStateException.class, |
1061 |
> |
() -> sl.unlockWrite(stamp)); |
1062 |
> |
} |
1063 |
> |
{ |
1064 |
> |
StampedLock sl = new StampedLock(); |
1065 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1066 |
> |
sl.writeLock(); |
1067 |
> |
assertThrows(IllegalMonitorStateException.class, |
1068 |
> |
() -> sl.unlock(stamp)); |
1069 |
> |
} |
1070 |
> |
{ |
1071 |
> |
StampedLock sl = new StampedLock(); |
1072 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1073 |
> |
sl.readLock(); |
1074 |
> |
assertThrows(IllegalMonitorStateException.class, |
1075 |
> |
() -> sl.unlockRead(stamp)); |
1076 |
> |
} |
1077 |
> |
{ |
1078 |
> |
StampedLock sl = new StampedLock(); |
1079 |
> |
sl.readLock(); |
1080 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1081 |
> |
assertValid(sl, stamp); |
1082 |
> |
sl.readLock(); |
1083 |
> |
assertThrows(IllegalMonitorStateException.class, |
1084 |
> |
() -> sl.unlockRead(stamp)); |
1085 |
> |
} |
1086 |
> |
{ |
1087 |
> |
StampedLock sl = new StampedLock(); |
1088 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1089 |
> |
sl.readLock(); |
1090 |
> |
assertThrows(IllegalMonitorStateException.class, |
1091 |
> |
() -> sl.unlock(stamp)); |
1092 |
> |
} |
1093 |
> |
{ |
1094 |
> |
StampedLock sl = new StampedLock(); |
1095 |
> |
sl.readLock(); |
1096 |
> |
long stamp = sl.tryConvertToOptimisticRead(sl.readLock()); |
1097 |
> |
sl.readLock(); |
1098 |
> |
assertThrows(IllegalMonitorStateException.class, |
1099 |
> |
() -> sl.unlock(stamp)); |
1100 |
> |
} |
1101 |
> |
} |
1102 |
> |
|
1103 |
> |
static long writeLockInterruptiblyUninterrupted(StampedLock sl) { |
1104 |
> |
try { return sl.writeLockInterruptibly(); } |
1105 |
> |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1106 |
> |
} |
1107 |
> |
|
1108 |
> |
static long tryWriteLockUninterrupted(StampedLock sl, long time, TimeUnit unit) { |
1109 |
> |
try { return sl.tryWriteLock(time, unit); } |
1110 |
> |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1111 |
> |
} |
1112 |
> |
|
1113 |
> |
static long readLockInterruptiblyUninterrupted(StampedLock sl) { |
1114 |
> |
try { return sl.readLockInterruptibly(); } |
1115 |
> |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1116 |
> |
} |
1117 |
> |
|
1118 |
> |
static long tryReadLockUninterrupted(StampedLock sl, long time, TimeUnit unit) { |
1119 |
> |
try { return sl.tryReadLock(time, unit); } |
1120 |
> |
catch (InterruptedException ex) { throw new AssertionError(ex); } |
1121 |
> |
} |
1122 |
> |
|
1123 |
> |
/** |
1124 |
> |
* Invalid stamps result in IllegalMonitorStateException |
1125 |
> |
*/ |
1126 |
> |
public void testInvalidStampsThrowIllegalMonitorStateException() { |
1127 |
> |
final StampedLock sl = new StampedLock(); |
1128 |
> |
|
1129 |
> |
assertThrows(IllegalMonitorStateException.class, |
1130 |
> |
() -> sl.unlockWrite(0L), |
1131 |
> |
() -> sl.unlockRead(0L), |
1132 |
> |
() -> sl.unlock(0L)); |
1133 |
> |
|
1134 |
> |
final long optimisticStamp = sl.tryOptimisticRead(); |
1135 |
> |
final long readStamp = sl.readLock(); |
1136 |
> |
sl.unlockRead(readStamp); |
1137 |
> |
final long writeStamp = sl.writeLock(); |
1138 |
> |
sl.unlockWrite(writeStamp); |
1139 |
> |
assertTrue(optimisticStamp != 0L && readStamp != 0L && writeStamp != 0L); |
1140 |
> |
final long[] noLongerValidStamps = { optimisticStamp, readStamp, writeStamp }; |
1141 |
> |
final Runnable assertNoLongerValidStampsThrow = () -> { |
1142 |
> |
for (long noLongerValidStamp : noLongerValidStamps) |
1143 |
> |
assertThrows(IllegalMonitorStateException.class, |
1144 |
> |
() -> sl.unlockWrite(noLongerValidStamp), |
1145 |
> |
() -> sl.unlockRead(noLongerValidStamp), |
1146 |
> |
() -> sl.unlock(noLongerValidStamp)); |
1147 |
> |
}; |
1148 |
> |
assertNoLongerValidStampsThrow.run(); |
1149 |
> |
|
1150 |
> |
for (Function<StampedLock, Long> readLocker : readLockers()) |
1151 |
> |
for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) { |
1152 |
> |
final long stamp = readLocker.apply(sl); |
1153 |
> |
assertValid(sl, stamp); |
1154 |
> |
assertNoLongerValidStampsThrow.run(); |
1155 |
> |
assertThrows(IllegalMonitorStateException.class, |
1156 |
> |
() -> sl.unlockWrite(stamp), |
1157 |
> |
() -> sl.unlockRead(sl.tryOptimisticRead()), |
1158 |
> |
() -> sl.unlockRead(0L)); |
1159 |
> |
readUnlocker.accept(sl, stamp); |
1160 |
> |
assertUnlocked(sl); |
1161 |
> |
assertNoLongerValidStampsThrow.run(); |
1162 |
> |
} |
1163 |
> |
|
1164 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
1165 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
1166 |
> |
final long stamp = writeLocker.apply(sl); |
1167 |
> |
assertValid(sl, stamp); |
1168 |
> |
assertNoLongerValidStampsThrow.run(); |
1169 |
> |
assertThrows(IllegalMonitorStateException.class, |
1170 |
> |
() -> sl.unlockRead(stamp), |
1171 |
> |
() -> sl.unlockWrite(0L)); |
1172 |
> |
writeUnlocker.accept(sl, stamp); |
1173 |
> |
assertUnlocked(sl); |
1174 |
> |
assertNoLongerValidStampsThrow.run(); |
1175 |
> |
} |
1176 |
> |
} |
1177 |
> |
|
1178 |
> |
/** |
1179 |
> |
* Read locks can be very deeply nested |
1180 |
> |
*/ |
1181 |
> |
public void testDeeplyNestedReadLocks() { |
1182 |
> |
final StampedLock lock = new StampedLock(); |
1183 |
> |
final int depth = 300; |
1184 |
> |
final long[] stamps = new long[depth]; |
1185 |
> |
final List<Function<StampedLock, Long>> readLockers = readLockers(); |
1186 |
> |
final List<BiConsumer<StampedLock, Long>> readUnlockers = readUnlockers(); |
1187 |
> |
for (int i = 0; i < depth; i++) { |
1188 |
> |
Function<StampedLock, Long> readLocker |
1189 |
> |
= readLockers.get(i % readLockers.size()); |
1190 |
> |
long stamp = readLocker.apply(lock); |
1191 |
> |
assertEquals(i + 1, lock.getReadLockCount()); |
1192 |
> |
assertTrue(lock.isReadLocked()); |
1193 |
> |
stamps[i] = stamp; |
1194 |
> |
} |
1195 |
> |
for (int i = 0; i < depth; i++) { |
1196 |
> |
BiConsumer<StampedLock, Long> readUnlocker |
1197 |
> |
= readUnlockers.get(i % readUnlockers.size()); |
1198 |
> |
assertEquals(depth - i, lock.getReadLockCount()); |
1199 |
> |
assertTrue(lock.isReadLocked()); |
1200 |
> |
readUnlocker.accept(lock, stamps[depth - 1 - i]); |
1201 |
> |
} |
1202 |
> |
assertUnlocked(lock); |
1203 |
> |
} |
1204 |
> |
|
1205 |
> |
/** |
1206 |
> |
* Stamped locks are not reentrant. |
1207 |
> |
*/ |
1208 |
> |
public void testNonReentrant() throws InterruptedException { |
1209 |
> |
final StampedLock lock = new StampedLock(); |
1210 |
> |
long stamp; |
1211 |
> |
|
1212 |
> |
stamp = lock.writeLock(); |
1213 |
> |
assertValid(lock, stamp); |
1214 |
> |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
1215 |
> |
assertEquals(0L, lock.tryReadLock(0L, DAYS)); |
1216 |
> |
assertValid(lock, stamp); |
1217 |
> |
lock.unlockWrite(stamp); |
1218 |
> |
|
1219 |
> |
stamp = lock.tryWriteLock(1L, DAYS); |
1220 |
> |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
1221 |
> |
assertValid(lock, stamp); |
1222 |
> |
lock.unlockWrite(stamp); |
1223 |
> |
|
1224 |
> |
stamp = lock.readLock(); |
1225 |
> |
assertEquals(0L, lock.tryWriteLock(0L, DAYS)); |
1226 |
> |
assertValid(lock, stamp); |
1227 |
> |
lock.unlockRead(stamp); |
1228 |
> |
} |
1229 |
> |
|
1230 |
> |
/** |
1231 |
> |
* """StampedLocks have no notion of ownership. Locks acquired in |
1232 |
> |
* one thread can be released or converted in another.""" |
1233 |
> |
*/ |
1234 |
> |
public void testNoOwnership() throws Throwable { |
1235 |
> |
ArrayList<Future<?>> futures = new ArrayList<>(); |
1236 |
> |
for (Function<StampedLock, Long> writeLocker : writeLockers()) |
1237 |
> |
for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) { |
1238 |
> |
StampedLock lock = new StampedLock(); |
1239 |
> |
long stamp = writeLocker.apply(lock); |
1240 |
> |
futures.add(cachedThreadPool.submit(new CheckedRunnable() { |
1241 |
> |
public void realRun() { |
1242 |
> |
writeUnlocker.accept(lock, stamp); |
1243 |
> |
assertUnlocked(lock); |
1244 |
> |
assertFalse(lock.validate(stamp)); |
1245 |
> |
}})); |
1246 |
> |
} |
1247 |
> |
for (Future<?> future : futures) |
1248 |
> |
assertNull(future.get()); |
1249 |
> |
} |
1250 |
> |
|
1251 |
> |
/** Tries out sample usage code from StampedLock javadoc. */ |
1252 |
> |
public void testSampleUsage() throws Throwable { |
1253 |
> |
class Point { |
1254 |
> |
private double x, y; |
1255 |
> |
private final StampedLock sl = new StampedLock(); |
1256 |
> |
|
1257 |
> |
void move(double deltaX, double deltaY) { // an exclusively locked method |
1258 |
> |
long stamp = sl.writeLock(); |
1259 |
> |
try { |
1260 |
> |
x += deltaX; |
1261 |
> |
y += deltaY; |
1262 |
> |
} finally { |
1263 |
> |
sl.unlockWrite(stamp); |
1264 |
> |
} |
1265 |
> |
} |
1266 |
> |
|
1267 |
> |
double distanceFromOrigin() { // A read-only method |
1268 |
> |
double currentX, currentY; |
1269 |
> |
long stamp = sl.tryOptimisticRead(); |
1270 |
> |
do { |
1271 |
> |
if (stamp == 0L) |
1272 |
> |
stamp = sl.readLock(); |
1273 |
> |
try { |
1274 |
> |
// possibly racy reads |
1275 |
> |
currentX = x; |
1276 |
> |
currentY = y; |
1277 |
> |
} finally { |
1278 |
> |
stamp = sl.tryConvertToOptimisticRead(stamp); |
1279 |
> |
} |
1280 |
> |
} while (stamp == 0); |
1281 |
> |
return Math.hypot(currentX, currentY); |
1282 |
> |
} |
1283 |
> |
|
1284 |
> |
double distanceFromOrigin2() { |
1285 |
> |
long stamp = sl.tryOptimisticRead(); |
1286 |
> |
try { |
1287 |
> |
retryHoldingLock: |
1288 |
> |
for (;; stamp = sl.readLock()) { |
1289 |
> |
if (stamp == 0L) |
1290 |
> |
continue retryHoldingLock; |
1291 |
> |
// possibly racy reads |
1292 |
> |
double currentX = x; |
1293 |
> |
double currentY = y; |
1294 |
> |
if (!sl.validate(stamp)) |
1295 |
> |
continue retryHoldingLock; |
1296 |
> |
return Math.hypot(currentX, currentY); |
1297 |
> |
} |
1298 |
> |
} finally { |
1299 |
> |
if (StampedLock.isReadLockStamp(stamp)) |
1300 |
> |
sl.unlockRead(stamp); |
1301 |
> |
} |
1302 |
> |
} |
1303 |
> |
|
1304 |
> |
void moveIfAtOrigin(double newX, double newY) { |
1305 |
> |
long stamp = sl.readLock(); |
1306 |
> |
try { |
1307 |
> |
while (x == 0.0 && y == 0.0) { |
1308 |
> |
long ws = sl.tryConvertToWriteLock(stamp); |
1309 |
> |
if (ws != 0L) { |
1310 |
> |
stamp = ws; |
1311 |
> |
x = newX; |
1312 |
> |
y = newY; |
1313 |
> |
return; |
1314 |
> |
} |
1315 |
> |
else { |
1316 |
> |
sl.unlockRead(stamp); |
1317 |
> |
stamp = sl.writeLock(); |
1318 |
> |
} |
1319 |
> |
} |
1320 |
> |
} finally { |
1321 |
> |
sl.unlock(stamp); |
1322 |
> |
} |
1323 |
> |
} |
1324 |
> |
} |
1325 |
> |
|
1326 |
> |
Point p = new Point(); |
1327 |
> |
p.move(3.0, 4.0); |
1328 |
> |
assertEquals(5.0, p.distanceFromOrigin()); |
1329 |
> |
p.moveIfAtOrigin(5.0, 12.0); |
1330 |
> |
assertEquals(5.0, p.distanceFromOrigin2()); |
1331 |
> |
} |
1332 |
> |
|
1333 |
> |
/** |
1334 |
> |
* Stamp inspection methods work as expected, and do not inspect |
1335 |
> |
* the state of the lock itself. |
1336 |
> |
*/ |
1337 |
> |
public void testStampStateInspectionMethods() { |
1338 |
> |
StampedLock lock = new StampedLock(); |
1339 |
> |
|
1340 |
> |
assertFalse(isWriteLockStamp(0L)); |
1341 |
> |
assertFalse(isReadLockStamp(0L)); |
1342 |
> |
assertFalse(isLockStamp(0L)); |
1343 |
> |
assertFalse(isOptimisticReadStamp(0L)); |
1344 |
> |
|
1345 |
> |
{ |
1346 |
> |
long stamp = lock.writeLock(); |
1347 |
> |
for (int i = 0; i < 2; i++) { |
1348 |
> |
assertTrue(isWriteLockStamp(stamp)); |
1349 |
> |
assertFalse(isReadLockStamp(stamp)); |
1350 |
> |
assertTrue(isLockStamp(stamp)); |
1351 |
> |
assertFalse(isOptimisticReadStamp(stamp)); |
1352 |
> |
if (i == 0) |
1353 |
> |
lock.unlockWrite(stamp); |
1354 |
> |
} |
1355 |
> |
} |
1356 |
> |
|
1357 |
> |
{ |
1358 |
> |
long stamp = lock.readLock(); |
1359 |
> |
for (int i = 0; i < 2; i++) { |
1360 |
> |
assertFalse(isWriteLockStamp(stamp)); |
1361 |
> |
assertTrue(isReadLockStamp(stamp)); |
1362 |
> |
assertTrue(isLockStamp(stamp)); |
1363 |
> |
assertFalse(isOptimisticReadStamp(stamp)); |
1364 |
> |
if (i == 0) |
1365 |
> |
lock.unlockRead(stamp); |
1366 |
> |
} |
1367 |
> |
} |
1368 |
> |
|
1369 |
> |
{ |
1370 |
> |
long optimisticStamp = lock.tryOptimisticRead(); |
1371 |
> |
long readStamp = lock.tryConvertToReadLock(optimisticStamp); |
1372 |
> |
long writeStamp = lock.tryConvertToWriteLock(readStamp); |
1373 |
> |
for (int i = 0; i < 2; i++) { |
1374 |
> |
assertFalse(isWriteLockStamp(optimisticStamp)); |
1375 |
> |
assertFalse(isReadLockStamp(optimisticStamp)); |
1376 |
> |
assertFalse(isLockStamp(optimisticStamp)); |
1377 |
> |
assertTrue(isOptimisticReadStamp(optimisticStamp)); |
1378 |
> |
|
1379 |
> |
assertFalse(isWriteLockStamp(readStamp)); |
1380 |
> |
assertTrue(isReadLockStamp(readStamp)); |
1381 |
> |
assertTrue(isLockStamp(readStamp)); |
1382 |
> |
assertFalse(isOptimisticReadStamp(readStamp)); |
1383 |
> |
|
1384 |
> |
assertTrue(isWriteLockStamp(writeStamp)); |
1385 |
> |
assertFalse(isReadLockStamp(writeStamp)); |
1386 |
> |
assertTrue(isLockStamp(writeStamp)); |
1387 |
> |
assertFalse(isOptimisticReadStamp(writeStamp)); |
1388 |
> |
if (i == 0) |
1389 |
> |
lock.unlockWrite(writeStamp); |
1390 |
> |
} |
1391 |
> |
} |
1392 |
> |
} |
1393 |
> |
|
1394 |
> |
/** |
1395 |
> |
* Multiple threads repeatedly contend for the same lock. |
1396 |
> |
*/ |
1397 |
> |
public void testConcurrentAccess() throws Exception { |
1398 |
> |
final StampedLock sl = new StampedLock(); |
1399 |
> |
final Lock wl = sl.asWriteLock(); |
1400 |
> |
final Lock rl = sl.asReadLock(); |
1401 |
> |
final long testDurationMillis = expensiveTests ? 1000 : 2; |
1402 |
> |
final int nTasks = ThreadLocalRandom.current().nextInt(1, 10); |
1403 |
> |
final AtomicBoolean done = new AtomicBoolean(false); |
1404 |
> |
final List<CompletableFuture> futures = new ArrayList<>(); |
1405 |
> |
final List<Callable<Long>> stampedWriteLockers = List.of( |
1406 |
> |
() -> sl.writeLock(), |
1407 |
> |
() -> writeLockInterruptiblyUninterrupted(sl), |
1408 |
> |
() -> tryWriteLockUninterrupted(sl, LONG_DELAY_MS, MILLISECONDS), |
1409 |
> |
() -> { |
1410 |
> |
long stamp; |
1411 |
> |
do { stamp = sl.tryConvertToWriteLock(sl.tryOptimisticRead()); } |
1412 |
> |
while (stamp == 0L); |
1413 |
> |
return stamp; |
1414 |
> |
}, |
1415 |
> |
() -> { |
1416 |
> |
long stamp; |
1417 |
> |
do { stamp = sl.tryWriteLock(); } while (stamp == 0L); |
1418 |
> |
return stamp; |
1419 |
> |
}, |
1420 |
> |
() -> { |
1421 |
> |
long stamp; |
1422 |
> |
do { stamp = sl.tryWriteLock(0L, DAYS); } while (stamp == 0L); |
1423 |
> |
return stamp; |
1424 |
> |
}); |
1425 |
> |
final List<Callable<Long>> stampedReadLockers = List.of( |
1426 |
> |
() -> sl.readLock(), |
1427 |
> |
() -> readLockInterruptiblyUninterrupted(sl), |
1428 |
> |
() -> tryReadLockUninterrupted(sl, LONG_DELAY_MS, MILLISECONDS), |
1429 |
> |
() -> { |
1430 |
> |
long stamp; |
1431 |
> |
do { stamp = sl.tryConvertToReadLock(sl.tryOptimisticRead()); } |
1432 |
> |
while (stamp == 0L); |
1433 |
> |
return stamp; |
1434 |
> |
}, |
1435 |
> |
() -> { |
1436 |
> |
long stamp; |
1437 |
> |
do { stamp = sl.tryReadLock(); } while (stamp == 0L); |
1438 |
> |
return stamp; |
1439 |
> |
}, |
1440 |
> |
() -> { |
1441 |
> |
long stamp; |
1442 |
> |
do { stamp = sl.tryReadLock(0L, DAYS); } while (stamp == 0L); |
1443 |
> |
return stamp; |
1444 |
> |
}); |
1445 |
> |
final List<Consumer<Long>> stampedWriteUnlockers = List.of( |
1446 |
> |
stamp -> sl.unlockWrite(stamp), |
1447 |
> |
stamp -> sl.unlock(stamp), |
1448 |
> |
stamp -> assertTrue(sl.tryUnlockWrite()), |
1449 |
> |
stamp -> wl.unlock(), |
1450 |
> |
stamp -> sl.tryConvertToOptimisticRead(stamp)); |
1451 |
> |
final List<Consumer<Long>> stampedReadUnlockers = List.of( |
1452 |
> |
stamp -> sl.unlockRead(stamp), |
1453 |
> |
stamp -> sl.unlock(stamp), |
1454 |
> |
stamp -> assertTrue(sl.tryUnlockRead()), |
1455 |
> |
stamp -> rl.unlock(), |
1456 |
> |
stamp -> sl.tryConvertToOptimisticRead(stamp)); |
1457 |
> |
final Action writer = () -> { |
1458 |
> |
// repeatedly acquires write lock |
1459 |
> |
var locker = chooseRandomly(stampedWriteLockers); |
1460 |
> |
var unlocker = chooseRandomly(stampedWriteUnlockers); |
1461 |
> |
while (!done.getAcquire()) { |
1462 |
> |
long stamp = locker.call(); |
1463 |
> |
try { |
1464 |
> |
assertTrue(isWriteLockStamp(stamp)); |
1465 |
> |
assertTrue(sl.isWriteLocked()); |
1466 |
> |
assertFalse(isReadLockStamp(stamp)); |
1467 |
> |
assertFalse(sl.isReadLocked()); |
1468 |
> |
assertEquals(0, sl.getReadLockCount()); |
1469 |
> |
assertTrue(sl.validate(stamp)); |
1470 |
> |
} finally { |
1471 |
> |
unlocker.accept(stamp); |
1472 |
> |
} |
1473 |
> |
} |
1474 |
> |
}; |
1475 |
> |
final Action reader = () -> { |
1476 |
> |
// repeatedly acquires read lock |
1477 |
> |
var locker = chooseRandomly(stampedReadLockers); |
1478 |
> |
var unlocker = chooseRandomly(stampedReadUnlockers); |
1479 |
> |
while (!done.getAcquire()) { |
1480 |
> |
long stamp = locker.call(); |
1481 |
> |
try { |
1482 |
> |
assertFalse(isWriteLockStamp(stamp)); |
1483 |
> |
assertFalse(sl.isWriteLocked()); |
1484 |
> |
assertTrue(isReadLockStamp(stamp)); |
1485 |
> |
assertTrue(sl.isReadLocked()); |
1486 |
> |
assertTrue(sl.getReadLockCount() > 0); |
1487 |
> |
assertTrue(sl.validate(stamp)); |
1488 |
> |
} finally { |
1489 |
> |
unlocker.accept(stamp); |
1490 |
> |
} |
1491 |
> |
} |
1492 |
> |
}; |
1493 |
> |
for (int i = nTasks; i--> 0; ) { |
1494 |
> |
Action task = chooseRandomly(writer, reader); |
1495 |
> |
futures.add(CompletableFuture.runAsync(checkedRunnable(task))); |
1496 |
> |
} |
1497 |
> |
Thread.sleep(testDurationMillis); |
1498 |
> |
done.setRelease(true); |
1499 |
> |
for (var future : futures) |
1500 |
> |
checkTimedGet(future, null); |
1501 |
|
} |
1502 |
|
|
1503 |
|
} |