1 |
/* |
2 |
* Written by Doug Lea and Martin Buchholz |
3 |
* with assistance from members of JCP JSR-166 Expert Group and |
4 |
* released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
9 |
|
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import java.util.concurrent.CountDownLatch; |
11 |
import java.util.concurrent.locks.Lock; |
12 |
import java.util.concurrent.locks.StampedLock; |
13 |
|
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import junit.framework.Test; |
15 |
import junit.framework.TestSuite; |
16 |
|
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public class StampedLockTest extends JSR166TestCase { |
18 |
public static void main(String[] args) { |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(StampedLockTest.class); |
23 |
} |
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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; |
30 |
InterruptibleLockRunnable(StampedLock l) { lock = l; } |
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public void realRun() throws InterruptedException { |
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lock.writeLockInterruptibly(); |
33 |
} |
34 |
} |
35 |
|
36 |
/** |
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* A runnable calling writeLockInterruptibly that expects to be |
38 |
* interrupted |
39 |
*/ |
40 |
class InterruptedLockRunnable extends CheckedInterruptedRunnable { |
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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 |
} |
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} |
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|
48 |
/** |
49 |
* Releases write lock, checking isWriteLocked before and after |
50 |
*/ |
51 |
void releaseWriteLock(StampedLock lock, long s) { |
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assertTrue(lock.isWriteLocked()); |
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lock.unlockWrite(s); |
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assertFalse(lock.isWriteLocked()); |
55 |
} |
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|
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/** |
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* Constructed StampedLock is in unlocked state |
59 |
*/ |
60 |
public void testConstructor() { |
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StampedLock lock; |
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lock = new StampedLock(); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
66 |
} |
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|
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/** |
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* write-locking and read-locking an unlocked lock succeed |
70 |
*/ |
71 |
public void testLock() { |
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StampedLock lock = new StampedLock(); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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long s = lock.writeLock(); |
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assertTrue(lock.isWriteLocked()); |
78 |
assertFalse(lock.isReadLocked()); |
79 |
assertEquals(lock.getReadLockCount(), 0); |
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lock.unlockWrite(s); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
83 |
assertEquals(lock.getReadLockCount(), 0); |
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long rs = lock.readLock(); |
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assertFalse(lock.isWriteLocked()); |
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assertTrue(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 1); |
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lock.unlockRead(rs); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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} |
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|
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/** |
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* unlock releases either a read or write lock |
96 |
*/ |
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public void testUnlock() { |
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StampedLock lock = new StampedLock(); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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long s = lock.writeLock(); |
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assertTrue(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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lock.unlock(s); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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long rs = lock.readLock(); |
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assertFalse(lock.isWriteLocked()); |
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assertTrue(lock.isReadLocked()); |
113 |
assertEquals(lock.getReadLockCount(), 1); |
114 |
lock.unlock(rs); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
118 |
} |
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|
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/** |
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* tryUnlockRead/Write succeeds if locked in associated mode else |
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* returns false |
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*/ |
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public void testTryUnlock() { |
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StampedLock lock = new StampedLock(); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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long s = lock.writeLock(); |
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assertTrue(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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assertFalse(lock.tryUnlockRead()); |
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assertTrue(lock.tryUnlockWrite()); |
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assertFalse(lock.tryUnlockWrite()); |
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assertFalse(lock.tryUnlockRead()); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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long rs = lock.readLock(); |
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assertFalse(lock.isWriteLocked()); |
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assertTrue(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 1); |
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assertFalse(lock.tryUnlockWrite()); |
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assertTrue(lock.tryUnlockRead()); |
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assertFalse(lock.tryUnlockRead()); |
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assertFalse(lock.tryUnlockWrite()); |
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assertFalse(lock.isWriteLocked()); |
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assertFalse(lock.isReadLocked()); |
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assertEquals(lock.getReadLockCount(), 0); |
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} |
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|
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/** |
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* write-unlocking an unlocked lock throws IllegalMonitorStateException |
155 |
*/ |
156 |
public void testWriteUnlock_IMSE() { |
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StampedLock lock = new StampedLock(); |
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try { |
159 |
lock.unlockWrite(0L); |
160 |
shouldThrow(); |
161 |
} catch (IllegalMonitorStateException success) {} |
162 |
} |
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|
164 |
/** |
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* write-unlocking an unlocked lock throws IllegalMonitorStateException |
166 |
*/ |
167 |
public void testWriteUnlock_IMSE2() { |
168 |
StampedLock lock = new StampedLock(); |
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long s = lock.writeLock(); |
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lock.unlockWrite(s); |
171 |
try { |
172 |
lock.unlockWrite(s); |
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shouldThrow(); |
174 |
} catch (IllegalMonitorStateException success) {} |
175 |
} |
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|
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/** |
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* write-unlocking after readlock throws IllegalMonitorStateException |
179 |
*/ |
180 |
public void testWriteUnlock_IMSE3() { |
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StampedLock lock = new StampedLock(); |
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long s = lock.readLock(); |
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try { |
184 |
lock.unlockWrite(s); |
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shouldThrow(); |
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} catch (IllegalMonitorStateException success) {} |
187 |
} |
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|
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/** |
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* read-unlocking an unlocked lock throws IllegalMonitorStateException |
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*/ |
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public void testReadUnlock_IMSE() { |
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StampedLock lock = new StampedLock(); |
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long s = lock.readLock(); |
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lock.unlockRead(s); |
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try { |
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lock.unlockRead(s); |
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shouldThrow(); |
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} catch (IllegalMonitorStateException success) {} |
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} |
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|
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/** |
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* read-unlocking an unlocked lock throws IllegalMonitorStateException |
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*/ |
205 |
public void testReadUnlock_IMSE2() { |
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StampedLock lock = new StampedLock(); |
207 |
try { |
208 |
lock.unlockRead(0L); |
209 |
shouldThrow(); |
210 |
} catch (IllegalMonitorStateException success) {} |
211 |
} |
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|
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/** |
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* read-unlocking after writeLock throws IllegalMonitorStateException |
215 |
*/ |
216 |
public void testReadUnlock_IMSE3() { |
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StampedLock lock = new StampedLock(); |
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long s = lock.writeLock(); |
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try { |
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lock.unlockRead(s); |
221 |
shouldThrow(); |
222 |
} catch (IllegalMonitorStateException success) {} |
223 |
} |
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|
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/** |
226 |
* validate(0) fails |
227 |
*/ |
228 |
public void testValidate0() { |
229 |
StampedLock lock = new StampedLock(); |
230 |
assertFalse(lock.validate(0L)); |
231 |
} |
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|
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/** |
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* A stamp obtained from a successful lock operation validates |
235 |
*/ |
236 |
public void testValidate() throws InterruptedException { |
237 |
StampedLock lock = new StampedLock(); |
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long s = lock.writeLock(); |
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assertTrue(lock.validate(s)); |
240 |
lock.unlockWrite(s); |
241 |
s = lock.readLock(); |
242 |
assertTrue(lock.validate(s)); |
243 |
lock.unlockRead(s); |
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assertTrue((s = lock.tryWriteLock()) != 0L); |
245 |
assertTrue(lock.validate(s)); |
246 |
lock.unlockWrite(s); |
247 |
assertTrue((s = lock.tryReadLock()) != 0L); |
248 |
assertTrue(lock.validate(s)); |
249 |
lock.unlockRead(s); |
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assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
251 |
assertTrue(lock.validate(s)); |
252 |
lock.unlockWrite(s); |
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assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
254 |
assertTrue(lock.validate(s)); |
255 |
lock.unlockRead(s); |
256 |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
257 |
} |
258 |
|
259 |
/** |
260 |
* A stamp obtained from an unsuccessful lock operation does not validate |
261 |
*/ |
262 |
public void testValidate2() throws InterruptedException { |
263 |
StampedLock lock = new StampedLock(); |
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long s; |
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assertTrue((s = lock.writeLock()) != 0L); |
266 |
assertTrue(lock.validate(s)); |
267 |
assertFalse(lock.validate(lock.tryWriteLock())); |
268 |
assertFalse(lock.validate(lock.tryWriteLock(10L, MILLISECONDS))); |
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assertFalse(lock.validate(lock.tryReadLock())); |
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assertFalse(lock.validate(lock.tryReadLock(10L, MILLISECONDS))); |
271 |
assertFalse(lock.validate(lock.tryOptimisticRead())); |
272 |
lock.unlockWrite(s); |
273 |
} |
274 |
|
275 |
/** |
276 |
* writeLockInterruptibly is interruptible |
277 |
*/ |
278 |
public void testWriteLockInterruptibly_Interruptible() |
279 |
throws InterruptedException { |
280 |
final CountDownLatch running = new CountDownLatch(1); |
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 |
|
289 |
running.await(); |
290 |
waitForThreadToEnterWaitState(t, 100); |
291 |
t.interrupt(); |
292 |
awaitTermination(t); |
293 |
releaseWriteLock(lock, s); |
294 |
} |
295 |
|
296 |
/** |
297 |
* timed tryWriteLock is interruptible |
298 |
*/ |
299 |
public void testWriteTryLock_Interruptible() throws InterruptedException { |
300 |
final CountDownLatch running = new CountDownLatch(1); |
301 |
final StampedLock lock = new StampedLock(); |
302 |
long s = lock.writeLock(); |
303 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
304 |
public void realRun() throws InterruptedException { |
305 |
running.countDown(); |
306 |
lock.tryWriteLock(2 * LONG_DELAY_MS, MILLISECONDS); |
307 |
}}); |
308 |
|
309 |
running.await(); |
310 |
waitForThreadToEnterWaitState(t, 100); |
311 |
t.interrupt(); |
312 |
awaitTermination(t); |
313 |
releaseWriteLock(lock, s); |
314 |
} |
315 |
|
316 |
/** |
317 |
* readLockInterruptibly is interruptible |
318 |
*/ |
319 |
public void testReadLockInterruptibly_Interruptible() |
320 |
throws InterruptedException { |
321 |
final CountDownLatch running = new CountDownLatch(1); |
322 |
final StampedLock lock = new StampedLock(); |
323 |
long s = lock.writeLock(); |
324 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
325 |
public void realRun() throws InterruptedException { |
326 |
running.countDown(); |
327 |
lock.readLockInterruptibly(); |
328 |
}}); |
329 |
|
330 |
running.await(); |
331 |
waitForThreadToEnterWaitState(t, 100); |
332 |
t.interrupt(); |
333 |
awaitTermination(t); |
334 |
releaseWriteLock(lock, s); |
335 |
} |
336 |
|
337 |
/** |
338 |
* timed tryReadLock is interruptible |
339 |
*/ |
340 |
public void testReadTryLock_Interruptible() throws InterruptedException { |
341 |
final CountDownLatch running = new CountDownLatch(1); |
342 |
final StampedLock lock = new StampedLock(); |
343 |
long s = lock.writeLock(); |
344 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
345 |
public void realRun() throws InterruptedException { |
346 |
running.countDown(); |
347 |
lock.tryReadLock(2 * LONG_DELAY_MS, MILLISECONDS); |
348 |
}}); |
349 |
|
350 |
running.await(); |
351 |
waitForThreadToEnterWaitState(t, 100); |
352 |
t.interrupt(); |
353 |
awaitTermination(t); |
354 |
releaseWriteLock(lock, s); |
355 |
} |
356 |
|
357 |
/** |
358 |
* tryWriteLock on an unlocked lock succeeds |
359 |
*/ |
360 |
public void testWriteTryLock() { |
361 |
final StampedLock lock = new StampedLock(); |
362 |
long s = lock.tryWriteLock(); |
363 |
assertTrue(s != 0L); |
364 |
assertTrue(lock.isWriteLocked()); |
365 |
long s2 = lock.tryWriteLock(); |
366 |
assertEquals(s2, 0L); |
367 |
releaseWriteLock(lock, s); |
368 |
} |
369 |
|
370 |
/** |
371 |
* tryWriteLock fails if locked |
372 |
*/ |
373 |
public void testWriteTryLockWhenLocked() { |
374 |
final StampedLock lock = new StampedLock(); |
375 |
long s = lock.writeLock(); |
376 |
Thread t = newStartedThread(new CheckedRunnable() { |
377 |
public void realRun() { |
378 |
long ws = lock.tryWriteLock(); |
379 |
assertTrue(ws == 0L); |
380 |
}}); |
381 |
|
382 |
awaitTermination(t); |
383 |
releaseWriteLock(lock, s); |
384 |
} |
385 |
|
386 |
/** |
387 |
* tryReadLock fails if write-locked |
388 |
*/ |
389 |
public void testReadTryLockWhenLocked() { |
390 |
final StampedLock lock = new StampedLock(); |
391 |
long s = lock.writeLock(); |
392 |
Thread t = newStartedThread(new CheckedRunnable() { |
393 |
public void realRun() { |
394 |
long rs = lock.tryReadLock(); |
395 |
assertEquals(rs, 0L); |
396 |
}}); |
397 |
|
398 |
awaitTermination(t); |
399 |
releaseWriteLock(lock, s); |
400 |
} |
401 |
|
402 |
/** |
403 |
* Multiple threads can hold a read lock when not write-locked |
404 |
*/ |
405 |
public void testMultipleReadLocks() { |
406 |
final StampedLock lock = new StampedLock(); |
407 |
final long s = lock.readLock(); |
408 |
Thread t = newStartedThread(new CheckedRunnable() { |
409 |
public void realRun() throws InterruptedException { |
410 |
long s2 = lock.tryReadLock(); |
411 |
assertTrue(s2 != 0L); |
412 |
lock.unlockRead(s2); |
413 |
long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS); |
414 |
assertTrue(s3 != 0L); |
415 |
lock.unlockRead(s3); |
416 |
long s4 = lock.readLock(); |
417 |
lock.unlockRead(s4); |
418 |
}}); |
419 |
|
420 |
awaitTermination(t); |
421 |
lock.unlockRead(s); |
422 |
} |
423 |
|
424 |
/** |
425 |
* A writelock succeeds only after a reading thread unlocks |
426 |
*/ |
427 |
public void testWriteAfterReadLock() throws InterruptedException { |
428 |
final CountDownLatch running = new CountDownLatch(1); |
429 |
final StampedLock lock = new StampedLock(); |
430 |
long rs = lock.readLock(); |
431 |
Thread t = newStartedThread(new CheckedRunnable() { |
432 |
public void realRun() { |
433 |
running.countDown(); |
434 |
long s = lock.writeLock(); |
435 |
lock.unlockWrite(s); |
436 |
}}); |
437 |
|
438 |
running.await(); |
439 |
waitForThreadToEnterWaitState(t, 100); |
440 |
assertFalse(lock.isWriteLocked()); |
441 |
lock.unlockRead(rs); |
442 |
awaitTermination(t); |
443 |
assertFalse(lock.isWriteLocked()); |
444 |
} |
445 |
|
446 |
/** |
447 |
* A writelock succeeds only after reading threads unlock |
448 |
*/ |
449 |
public void testWriteAfterMultipleReadLocks() { |
450 |
final StampedLock lock = new StampedLock(); |
451 |
long s = lock.readLock(); |
452 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
453 |
public void realRun() { |
454 |
long rs = lock.readLock(); |
455 |
lock.unlockRead(rs); |
456 |
}}); |
457 |
|
458 |
awaitTermination(t1); |
459 |
|
460 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
461 |
public void realRun() { |
462 |
long ws = lock.writeLock(); |
463 |
lock.unlockWrite(ws); |
464 |
}}); |
465 |
|
466 |
assertFalse(lock.isWriteLocked()); |
467 |
lock.unlockRead(s); |
468 |
awaitTermination(t2); |
469 |
assertFalse(lock.isWriteLocked()); |
470 |
} |
471 |
|
472 |
/** |
473 |
* Readlocks succeed only after a writing thread unlocks |
474 |
*/ |
475 |
public void testReadAfterWriteLock() { |
476 |
final StampedLock lock = new StampedLock(); |
477 |
final long s = lock.writeLock(); |
478 |
Thread t1 = newStartedThread(new CheckedRunnable() { |
479 |
public void realRun() { |
480 |
long rs = lock.readLock(); |
481 |
lock.unlockRead(rs); |
482 |
}}); |
483 |
Thread t2 = newStartedThread(new CheckedRunnable() { |
484 |
public void realRun() { |
485 |
long rs = lock.readLock(); |
486 |
lock.unlockRead(rs); |
487 |
}}); |
488 |
|
489 |
releaseWriteLock(lock, s); |
490 |
awaitTermination(t1); |
491 |
awaitTermination(t2); |
492 |
} |
493 |
|
494 |
/** |
495 |
* tryReadLock succeeds if readlocked but not writelocked |
496 |
*/ |
497 |
public void testTryLockWhenReadLocked() { |
498 |
final StampedLock lock = new StampedLock(); |
499 |
long s = lock.readLock(); |
500 |
Thread t = newStartedThread(new CheckedRunnable() { |
501 |
public void realRun() { |
502 |
long rs = lock.tryReadLock(); |
503 |
threadAssertTrue(rs != 0L); |
504 |
lock.unlockRead(rs); |
505 |
}}); |
506 |
|
507 |
awaitTermination(t); |
508 |
lock.unlockRead(s); |
509 |
} |
510 |
|
511 |
/** |
512 |
* tryWriteLock fails when readlocked |
513 |
*/ |
514 |
public void testWriteTryLockWhenReadLocked() { |
515 |
final StampedLock lock = new StampedLock(); |
516 |
long s = lock.readLock(); |
517 |
Thread t = newStartedThread(new CheckedRunnable() { |
518 |
public void realRun() { |
519 |
long ws = lock.tryWriteLock(); |
520 |
threadAssertEquals(ws, 0L); |
521 |
}}); |
522 |
|
523 |
awaitTermination(t); |
524 |
lock.unlockRead(s); |
525 |
} |
526 |
|
527 |
/** |
528 |
* timed tryWriteLock times out if locked |
529 |
*/ |
530 |
public void testWriteTryLock_Timeout() { |
531 |
final StampedLock lock = new StampedLock(); |
532 |
long s = lock.writeLock(); |
533 |
Thread t = newStartedThread(new CheckedRunnable() { |
534 |
public void realRun() throws InterruptedException { |
535 |
long startTime = System.nanoTime(); |
536 |
long timeoutMillis = 10; |
537 |
long ws = lock.tryWriteLock(timeoutMillis, MILLISECONDS); |
538 |
assertEquals(ws, 0L); |
539 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
540 |
}}); |
541 |
|
542 |
awaitTermination(t); |
543 |
releaseWriteLock(lock, s); |
544 |
} |
545 |
|
546 |
/** |
547 |
* timed tryReadLock times out if write-locked |
548 |
*/ |
549 |
public void testReadTryLock_Timeout() { |
550 |
final StampedLock lock = new StampedLock(); |
551 |
long s = lock.writeLock(); |
552 |
Thread t = newStartedThread(new CheckedRunnable() { |
553 |
public void realRun() throws InterruptedException { |
554 |
long startTime = System.nanoTime(); |
555 |
long timeoutMillis = 10; |
556 |
long rs = lock.tryReadLock(timeoutMillis, MILLISECONDS); |
557 |
assertEquals(rs, 0L); |
558 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
559 |
}}); |
560 |
|
561 |
awaitTermination(t); |
562 |
assertTrue(lock.isWriteLocked()); |
563 |
lock.unlockWrite(s); |
564 |
} |
565 |
|
566 |
/** |
567 |
* writeLockInterruptibly succeeds if unlocked, else is interruptible |
568 |
*/ |
569 |
public void testWriteLockInterruptibly() throws InterruptedException { |
570 |
final CountDownLatch running = new CountDownLatch(1); |
571 |
final StampedLock lock = new StampedLock(); |
572 |
long s = lock.writeLockInterruptibly(); |
573 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
574 |
public void realRun() throws InterruptedException { |
575 |
running.countDown(); |
576 |
lock.writeLockInterruptibly(); |
577 |
}}); |
578 |
|
579 |
running.await(); |
580 |
waitForThreadToEnterWaitState(t, 100); |
581 |
t.interrupt(); |
582 |
assertTrue(lock.isWriteLocked()); |
583 |
awaitTermination(t); |
584 |
releaseWriteLock(lock, s); |
585 |
} |
586 |
|
587 |
/** |
588 |
* readLockInterruptibly succeeds if lock free else is interruptible |
589 |
*/ |
590 |
public void testReadLockInterruptibly() throws InterruptedException { |
591 |
final CountDownLatch running = new CountDownLatch(1); |
592 |
final StampedLock lock = new StampedLock(); |
593 |
long s; |
594 |
s = lock.readLockInterruptibly(); |
595 |
lock.unlockRead(s); |
596 |
s = lock.writeLockInterruptibly(); |
597 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
598 |
public void realRun() throws InterruptedException { |
599 |
running.countDown(); |
600 |
lock.readLockInterruptibly(); |
601 |
}}); |
602 |
|
603 |
running.await(); |
604 |
waitForThreadToEnterWaitState(t, 100); |
605 |
t.interrupt(); |
606 |
awaitTermination(t); |
607 |
releaseWriteLock(lock, s); |
608 |
} |
609 |
|
610 |
/** |
611 |
* A serialized lock deserializes as unlocked |
612 |
*/ |
613 |
public void testSerialization() { |
614 |
StampedLock lock = new StampedLock(); |
615 |
lock.writeLock(); |
616 |
StampedLock clone = serialClone(lock); |
617 |
assertTrue(lock.isWriteLocked()); |
618 |
assertFalse(clone.isWriteLocked()); |
619 |
long s = clone.writeLock(); |
620 |
assertTrue(clone.isWriteLocked()); |
621 |
clone.unlockWrite(s); |
622 |
assertFalse(clone.isWriteLocked()); |
623 |
} |
624 |
|
625 |
/** |
626 |
* toString indicates current lock state |
627 |
*/ |
628 |
public void testToString() { |
629 |
StampedLock lock = new StampedLock(); |
630 |
assertTrue(lock.toString().contains("Unlocked")); |
631 |
long s = lock.writeLock(); |
632 |
assertTrue(lock.toString().contains("Write-locked")); |
633 |
lock.unlockWrite(s); |
634 |
s = lock.readLock(); |
635 |
assertTrue(lock.toString().contains("Read-locks")); |
636 |
} |
637 |
|
638 |
/** |
639 |
* tryOptimisticRead succeeds and validates if unlocked, fails if locked |
640 |
*/ |
641 |
public void testValidateOptimistic() throws InterruptedException { |
642 |
StampedLock lock = new StampedLock(); |
643 |
long s, p; |
644 |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
645 |
assertTrue(lock.validate(p)); |
646 |
assertTrue((s = lock.writeLock()) != 0L); |
647 |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
648 |
assertTrue(lock.validate(s)); |
649 |
lock.unlockWrite(s); |
650 |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
651 |
assertTrue(lock.validate(p)); |
652 |
assertTrue((s = lock.readLock()) != 0L); |
653 |
assertTrue(lock.validate(s)); |
654 |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
655 |
assertTrue(lock.validate(p)); |
656 |
lock.unlockRead(s); |
657 |
assertTrue((s = lock.tryWriteLock()) != 0L); |
658 |
assertTrue(lock.validate(s)); |
659 |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
660 |
lock.unlockWrite(s); |
661 |
assertTrue((s = lock.tryReadLock()) != 0L); |
662 |
assertTrue(lock.validate(s)); |
663 |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
664 |
lock.unlockRead(s); |
665 |
assertTrue(lock.validate(p)); |
666 |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
667 |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
668 |
assertTrue(lock.validate(s)); |
669 |
lock.unlockWrite(s); |
670 |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
671 |
assertTrue(lock.validate(s)); |
672 |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
673 |
lock.unlockRead(s); |
674 |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
675 |
} |
676 |
|
677 |
/** |
678 |
* tryOptimisticRead stamp does not validate if a write lock intervenes |
679 |
*/ |
680 |
public void testValidateOptimisticWriteLocked() { |
681 |
StampedLock lock = new StampedLock(); |
682 |
long s, p; |
683 |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
684 |
assertTrue((s = lock.writeLock()) != 0L); |
685 |
assertFalse(lock.validate(p)); |
686 |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
687 |
assertTrue(lock.validate(s)); |
688 |
lock.unlockWrite(s); |
689 |
} |
690 |
|
691 |
/** |
692 |
* tryOptimisticRead stamp does not validate if a write lock |
693 |
* intervenes in another thread |
694 |
*/ |
695 |
public void testValidateOptimisticWriteLocked2() |
696 |
throws InterruptedException { |
697 |
final CountDownLatch running = new CountDownLatch(1); |
698 |
final StampedLock lock = new StampedLock(); |
699 |
long s, p; |
700 |
assertTrue((p = lock.tryOptimisticRead()) != 0L); |
701 |
Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
702 |
public void realRun() throws InterruptedException { |
703 |
lock.writeLockInterruptibly(); |
704 |
running.countDown(); |
705 |
lock.writeLockInterruptibly(); |
706 |
}}); |
707 |
|
708 |
running.await(); |
709 |
assertFalse(lock.validate(p)); |
710 |
assertFalse((p = lock.tryOptimisticRead()) != 0L); |
711 |
t.interrupt(); |
712 |
awaitTermination(t); |
713 |
} |
714 |
|
715 |
/** |
716 |
* tryConvertToOptimisticRead succeeds and validates if successfully locked, |
717 |
*/ |
718 |
public void testTryConvertToOptimisticRead() throws InterruptedException { |
719 |
StampedLock lock = new StampedLock(); |
720 |
long s, p; |
721 |
s = 0L; |
722 |
assertFalse((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
723 |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
724 |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
725 |
assertTrue((s = lock.writeLock()) != 0L); |
726 |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
727 |
assertTrue(lock.validate(p)); |
728 |
assertTrue((s = lock.readLock()) != 0L); |
729 |
assertTrue(lock.validate(s)); |
730 |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
731 |
assertTrue(lock.validate(p)); |
732 |
assertTrue((s = lock.tryWriteLock()) != 0L); |
733 |
assertTrue(lock.validate(s)); |
734 |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
735 |
assertTrue(lock.validate(p)); |
736 |
assertTrue((s = lock.tryReadLock()) != 0L); |
737 |
assertTrue(lock.validate(s)); |
738 |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
739 |
assertTrue(lock.validate(p)); |
740 |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
741 |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
742 |
assertTrue(lock.validate(p)); |
743 |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
744 |
assertTrue(lock.validate(s)); |
745 |
assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L); |
746 |
assertTrue(lock.validate(p)); |
747 |
} |
748 |
|
749 |
/** |
750 |
* tryConvertToReadLock succeeds and validates if successfully locked |
751 |
* or lock free; |
752 |
*/ |
753 |
public void testTryConvertToReadLock() throws InterruptedException { |
754 |
StampedLock lock = new StampedLock(); |
755 |
long s, p; |
756 |
s = 0L; |
757 |
assertFalse((p = lock.tryConvertToReadLock(s)) != 0L); |
758 |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
759 |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
760 |
lock.unlockRead(p); |
761 |
assertTrue((s = lock.writeLock()) != 0L); |
762 |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
763 |
assertTrue(lock.validate(p)); |
764 |
lock.unlockRead(p); |
765 |
assertTrue((s = lock.readLock()) != 0L); |
766 |
assertTrue(lock.validate(s)); |
767 |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
768 |
assertTrue(lock.validate(p)); |
769 |
lock.unlockRead(p); |
770 |
assertTrue((s = lock.tryWriteLock()) != 0L); |
771 |
assertTrue(lock.validate(s)); |
772 |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
773 |
assertTrue(lock.validate(p)); |
774 |
lock.unlockRead(p); |
775 |
assertTrue((s = lock.tryReadLock()) != 0L); |
776 |
assertTrue(lock.validate(s)); |
777 |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
778 |
assertTrue(lock.validate(p)); |
779 |
lock.unlockRead(p); |
780 |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
781 |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
782 |
assertTrue(lock.validate(p)); |
783 |
lock.unlockRead(p); |
784 |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
785 |
assertTrue(lock.validate(s)); |
786 |
assertTrue((p = lock.tryConvertToReadLock(s)) != 0L); |
787 |
assertTrue(lock.validate(p)); |
788 |
lock.unlockRead(p); |
789 |
} |
790 |
|
791 |
/** |
792 |
* tryConvertToWriteLock succeeds and validates if successfully locked |
793 |
* or lock free; |
794 |
*/ |
795 |
public void testTryConvertToWriteLock() throws InterruptedException { |
796 |
StampedLock lock = new StampedLock(); |
797 |
long s, p; |
798 |
s = 0L; |
799 |
assertFalse((p = lock.tryConvertToWriteLock(s)) != 0L); |
800 |
assertTrue((s = lock.tryOptimisticRead()) != 0L); |
801 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
802 |
lock.unlockWrite(p); |
803 |
assertTrue((s = lock.writeLock()) != 0L); |
804 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
805 |
assertTrue(lock.validate(p)); |
806 |
lock.unlockWrite(p); |
807 |
assertTrue((s = lock.readLock()) != 0L); |
808 |
assertTrue(lock.validate(s)); |
809 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
810 |
assertTrue(lock.validate(p)); |
811 |
lock.unlockWrite(p); |
812 |
assertTrue((s = lock.tryWriteLock()) != 0L); |
813 |
assertTrue(lock.validate(s)); |
814 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
815 |
assertTrue(lock.validate(p)); |
816 |
lock.unlockWrite(p); |
817 |
assertTrue((s = lock.tryReadLock()) != 0L); |
818 |
assertTrue(lock.validate(s)); |
819 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
820 |
assertTrue(lock.validate(p)); |
821 |
lock.unlockWrite(p); |
822 |
assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L); |
823 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
824 |
assertTrue(lock.validate(p)); |
825 |
lock.unlockWrite(p); |
826 |
assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L); |
827 |
assertTrue(lock.validate(s)); |
828 |
assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L); |
829 |
assertTrue(lock.validate(p)); |
830 |
lock.unlockWrite(p); |
831 |
} |
832 |
|
833 |
/** |
834 |
* asWriteLock can be locked and unlocked |
835 |
*/ |
836 |
public void testAsWriteLock() { |
837 |
StampedLock sl = new StampedLock(); |
838 |
Lock lock = sl.asWriteLock(); |
839 |
lock.lock(); |
840 |
assertFalse(lock.tryLock()); |
841 |
lock.unlock(); |
842 |
assertTrue(lock.tryLock()); |
843 |
} |
844 |
|
845 |
/** |
846 |
* asReadLock can be locked and unlocked |
847 |
*/ |
848 |
public void testAsReadLock() { |
849 |
StampedLock sl = new StampedLock(); |
850 |
Lock lock = sl.asReadLock(); |
851 |
lock.lock(); |
852 |
lock.unlock(); |
853 |
assertTrue(lock.tryLock()); |
854 |
} |
855 |
|
856 |
/** |
857 |
* asReadWriteLock.writeLock can be locked and unlocked |
858 |
*/ |
859 |
public void testAsReadWriteLockWriteLock() { |
860 |
StampedLock sl = new StampedLock(); |
861 |
Lock lock = sl.asReadWriteLock().writeLock(); |
862 |
lock.lock(); |
863 |
assertFalse(lock.tryLock()); |
864 |
lock.unlock(); |
865 |
assertTrue(lock.tryLock()); |
866 |
} |
867 |
|
868 |
/** |
869 |
* asReadWriteLock.readLock can be locked and unlocked |
870 |
*/ |
871 |
public void testAsReadWriteLockReadLock() { |
872 |
StampedLock sl = new StampedLock(); |
873 |
Lock lock = sl.asReadWriteLock().readLock(); |
874 |
lock.lock(); |
875 |
lock.unlock(); |
876 |
assertTrue(lock.tryLock()); |
877 |
} |
878 |
|
879 |
} |