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

Comparing jsr166/src/test/tck/StampedLockTest.java (file contents):
Revision 1.26 by jsr166, Sun Jul 17 03:06:50 2016 UTC vs.
Revision 1.40 by jsr166, Tue Sep 26 01:38:55 2017 UTC

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

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