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

Comparing jsr166/src/test/tck/StampedLockTest.java (file contents):
Revision 1.5 by dl, Thu Mar 21 16:26:43 2013 UTC vs.
Revision 1.30 by jsr166, Sat Feb 18 00:32:30 2017 UTC

#	Line 5 | Line 5
5		* http://creativecommons.org/publicdomain/zero/1.0/
6		*/
7
8	<	import junit.framework.*;
9	<	import java.util.concurrent.atomic.AtomicBoolean;
8	>	import static java.util.concurrent.TimeUnit.DAYS;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	>	import static java.util.concurrent.TimeUnit.SECONDS;
11	>
12	>	import java.util.ArrayList;
13	>	import java.util.List;
14	>	import java.util.concurrent.CountDownLatch;
15	>	import java.util.concurrent.Future;
16	>	import java.util.concurrent.TimeUnit;
17		import java.util.concurrent.locks.Lock;
18		import java.util.concurrent.locks.StampedLock;
19	<	import java.util.concurrent.CountDownLatch;
20	<	import static java.util.concurrent.TimeUnit.MILLISECONDS;
21	<	import java.util.*;
22	<	import java.util.concurrent.*;
19	>	import java.util.function.BiConsumer;
20	>	import java.util.function.Function;
21	>
22	>	import junit.framework.Test;
23	>	import junit.framework.TestSuite;
24
25		public class StampedLockTest extends JSR166TestCase {
26		public static void main(String[] args) {
27	<	junit.textui.TestRunner.run(suite());
27	>	main(suite(), args);
28		}
29		public static Test suite() {
30		return new TestSuite(StampedLockTest.class);
31		}
32
33		/**
26	–	* A runnable calling writeLockInterruptibly
27	–	*/
28	–	class InterruptibleLockRunnable extends CheckedRunnable {
29	–	final StampedLock lock;
30	–	InterruptibleLockRunnable(StampedLock l) { lock = l; }
31	–	public void realRun() throws InterruptedException {
32	–	lock.writeLockInterruptibly();
33	–	}
34	–	}
35	–
36	–	/**
37	–	* A runnable calling writeLockInterruptibly that expects to be
38	–	* interrupted
39	–	*/
40	–	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
41	–	final StampedLock lock;
42	–	InterruptedLockRunnable(StampedLock l) { lock = l; }
43	–	public void realRun() throws InterruptedException {
44	–	lock.writeLockInterruptibly();
45	–	}
46	–	}
47	–
48	–	/**
34		* Releases write lock, checking isWriteLocked before and after
35		*/
36	<	void releaseWriteLock(StampedLock lock, long s) {
36	>	void releaseWriteLock(StampedLock lock, long stamp) {
37		assertTrue(lock.isWriteLocked());
38	<	lock.unlockWrite(s);
38	>	assertValid(lock, stamp);
39	>	lock.unlockWrite(stamp);
40		assertFalse(lock.isWriteLocked());
41	+	assertFalse(lock.validate(stamp));
42		}
43
44		/**
45	<	* Constructed StampedLock is in unlocked state
45	>	* Releases read lock, checking isReadLocked before and after
46		*/
47	<	public void testConstructor() {
48	<	StampedLock lock;
49	<	lock = new StampedLock();
50	<	assertFalse(lock.isWriteLocked());
47	>	void releaseReadLock(StampedLock lock, long stamp) {
48	>	assertTrue(lock.isReadLocked());
49	>	assertValid(lock, stamp);
50	>	lock.unlockRead(stamp);
51		assertFalse(lock.isReadLocked());
52	<	assertEquals(lock.getReadLockCount(), 0);
52	>	assertTrue(lock.validate(stamp));
53		}
54
55	<	/**
56	<	* write-locking and read-locking an unlocked lock succeed
57	<	*/
71	<	public void testLock() {
72	<	StampedLock lock = new StampedLock();
73	<	assertFalse(lock.isWriteLocked());
74	<	assertFalse(lock.isReadLocked());
75	<	assertEquals(lock.getReadLockCount(), 0);
76	<	long s = lock.writeLock();
77	<	assertTrue(lock.isWriteLocked());
78	<	assertFalse(lock.isReadLocked());
79	<	assertEquals(lock.getReadLockCount(), 0);
80	<	lock.unlockWrite(s);
81	<	assertFalse(lock.isWriteLocked());
82	<	assertFalse(lock.isReadLocked());
83	<	assertEquals(lock.getReadLockCount(), 0);
84	<	long rs = lock.readLock();
85	<	assertFalse(lock.isWriteLocked());
86	<	assertTrue(lock.isReadLocked());
87	<	assertEquals(lock.getReadLockCount(), 1);
88	<	lock.unlockRead(rs);
89	<	assertFalse(lock.isWriteLocked());
90	<	assertFalse(lock.isReadLocked());
91	<	assertEquals(lock.getReadLockCount(), 0);
55	>	long assertNonZero(long v) {
56	>	assertTrue(v != 0L);
57	>	return v;
58		}
59
60	<	/**
61	<	* unlock releases either a read or write lock
62	<	*/
63	<	public void testUnlock() {
98	<	StampedLock lock = new StampedLock();
99	<	assertFalse(lock.isWriteLocked());
100	<	assertFalse(lock.isReadLocked());
101	<	assertEquals(lock.getReadLockCount(), 0);
102	<	long s = lock.writeLock();
103	<	assertTrue(lock.isWriteLocked());
104	<	assertFalse(lock.isReadLocked());
105	<	assertEquals(lock.getReadLockCount(), 0);
106	<	lock.unlock(s);
107	<	assertFalse(lock.isWriteLocked());
108	<	assertFalse(lock.isReadLocked());
109	<	assertEquals(lock.getReadLockCount(), 0);
110	<	long rs = lock.readLock();
111	<	assertFalse(lock.isWriteLocked());
112	<	assertTrue(lock.isReadLocked());
113	<	assertEquals(lock.getReadLockCount(), 1);
114	<	lock.unlock(rs);
115	<	assertFalse(lock.isWriteLocked());
116	<	assertFalse(lock.isReadLocked());
117	<	assertEquals(lock.getReadLockCount(), 0);
60	>	long assertValid(StampedLock lock, long stamp) {
61	>	assertTrue(stamp != 0L);
62	>	assertTrue(lock.validate(stamp));
63	>	return stamp;
64		}
65
66	<	/**
121	<	* tryUnlockRead/Write succeeds if locked in associated mode else
122	<	* returns false
123	<	*/
124	<	public void testTryUnlock() {
125	<	StampedLock lock = new StampedLock();
126	<	assertFalse(lock.isWriteLocked());
127	<	assertFalse(lock.isReadLocked());
128	<	assertEquals(lock.getReadLockCount(), 0);
129	<	long s = lock.writeLock();
130	<	assertTrue(lock.isWriteLocked());
66	>	void assertUnlocked(StampedLock lock) {
67		assertFalse(lock.isReadLocked());
132	–	assertEquals(lock.getReadLockCount(), 0);
133	–	assertFalse(lock.tryUnlockRead());
134	–	assertTrue(lock.tryUnlockWrite());
135	–	assertFalse(lock.tryUnlockWrite());
136	–	assertFalse(lock.tryUnlockRead());
68		assertFalse(lock.isWriteLocked());
69	<	assertFalse(lock.isReadLocked());
70	<	assertEquals(lock.getReadLockCount(), 0);
140	<	long rs = lock.readLock();
141	<	assertFalse(lock.isWriteLocked());
142	<	assertTrue(lock.isReadLocked());
143	<	assertEquals(lock.getReadLockCount(), 1);
144	<	assertFalse(lock.tryUnlockWrite());
145	<	assertTrue(lock.tryUnlockRead());
146	<	assertFalse(lock.tryUnlockRead());
147	<	assertFalse(lock.tryUnlockWrite());
148	<	assertFalse(lock.isWriteLocked());
149	<	assertFalse(lock.isReadLocked());
150	<	assertEquals(lock.getReadLockCount(), 0);
69	>	assertEquals(0, lock.getReadLockCount());
70	>	assertValid(lock, lock.tryOptimisticRead());
71		}
72
73	<	/**
74	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
75	<	*/
76	<	public void testWriteUnlock_IMSE() {
77	<	StampedLock lock = new StampedLock();
78	<	try {
79	<	lock.unlockWrite(0L);
80	<	shouldThrow();
81	<	} catch (IllegalMonitorStateException success) {}
73	>	List<Action> lockLockers(Lock lock) {
74	>	List<Action> lockers = new ArrayList<>();
75	>	lockers.add(() -> lock.lock());
76	>	lockers.add(() -> lock.lockInterruptibly());
77	>	lockers.add(() -> lock.tryLock());
78	>	lockers.add(() -> lock.tryLock(Long.MIN_VALUE, DAYS));
79	>	lockers.add(() -> lock.tryLock(0L, DAYS));
80	>	lockers.add(() -> lock.tryLock(Long.MAX_VALUE, DAYS));
81	>	return lockers;
82	>	}
83	>
84	>	List<Function<StampedLock, Long>> readLockers() {
85	>	List<Function<StampedLock, Long>> readLockers = new ArrayList<>();
86	>	readLockers.add(sl -> sl.readLock());
87	>	readLockers.add(sl -> sl.tryReadLock());
88	>	readLockers.add(sl -> readLockInterruptiblyUninterrupted(sl));
89	>	readLockers.add(sl -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
90	>	readLockers.add(sl -> tryReadLockUninterrupted(sl, 0L, DAYS));
91	>	readLockers.add(sl -> sl.tryConvertToReadLock(sl.tryOptimisticRead()));
92	>	return readLockers;
93	>	}
94	>
95	>	List<BiConsumer<StampedLock, Long>> readUnlockers() {
96	>	List<BiConsumer<StampedLock, Long>> readUnlockers = new ArrayList<>();
97	>	readUnlockers.add((sl, stamp) -> sl.unlockRead(stamp));
98	>	readUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockRead()));
99	>	readUnlockers.add((sl, stamp) -> sl.asReadLock().unlock());
100	>	readUnlockers.add((sl, stamp) -> sl.unlock(stamp));
101	>	readUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp)));
102	>	return readUnlockers;
103	>	}
104	>
105	>	List<Function<StampedLock, Long>> writeLockers() {
106	>	List<Function<StampedLock, Long>> writeLockers = new ArrayList<>();
107	>	writeLockers.add(sl -> sl.writeLock());
108	>	writeLockers.add(sl -> sl.tryWriteLock());
109	>	writeLockers.add(sl -> writeLockInterruptiblyUninterrupted(sl));
110	>	writeLockers.add(sl -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
111	>	writeLockers.add(sl -> tryWriteLockUninterrupted(sl, 0L, DAYS));
112	>	writeLockers.add(sl -> sl.tryConvertToWriteLock(sl.tryOptimisticRead()));
113	>	return writeLockers;
114	>	}
115	>
116	>	List<BiConsumer<StampedLock, Long>> writeUnlockers() {
117	>	List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>();
118	>	writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp));
119	>	writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite()));
120	>	writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock());
121	>	writeUnlockers.add((sl, stamp) -> sl.unlock(stamp));
122	>	writeUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp)));
123	>	return writeUnlockers;
124		}
125
126		/**
127	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
127	>	* Constructed StampedLock is in unlocked state
128		*/
129	<	public void testWriteUnlock_IMSE2() {
130	<	StampedLock lock = new StampedLock();
169	<	try {
170	<	long s = lock.writeLock();
171	<	lock.unlockWrite(s);
172	<	lock.unlockWrite(s);
173	<	shouldThrow();
174	<	} catch (IllegalMonitorStateException success) {}
129	>	public void testConstructor() {
130	>	assertUnlocked(new StampedLock());
131		}
132
133		/**
134	<	* write-unlocking after readlock throws IllegalMonitorStateException
134	>	* write-locking, then unlocking, an unlocked lock succeed
135		*/
136	<	public void testWriteUnlock_IMSE3() {
136	>	public void testWriteLock_lockUnlock() {
137		StampedLock lock = new StampedLock();
138	<	try {
139	<	long s = lock.readLock();
140	<	lock.unlockWrite(s);
141	<	shouldThrow();
142	<	} catch (IllegalMonitorStateException success) {}
138	>
139	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
140	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
141	>	assertFalse(lock.isWriteLocked());
142	>	assertFalse(lock.isReadLocked());
143	>	assertEquals(0, lock.getReadLockCount());
144	>
145	>	long s = writeLocker.apply(lock);
146	>	assertValid(lock, s);
147	>	assertTrue(lock.isWriteLocked());
148	>	assertFalse(lock.isReadLocked());
149	>	assertEquals(0, lock.getReadLockCount());
150	>	writeUnlocker.accept(lock, s);
151	>	assertUnlocked(lock);
152	>	}
153		}
154
155		/**
156	<	* read-unlocking an unlocked lock throws IllegalMonitorStateException
156	>	* read-locking, then unlocking, an unlocked lock succeed
157		*/
158	<	public void testReadUnlock_IMSE() {
158	>	public void testReadLock_lockUnlock() {
159		StampedLock lock = new StampedLock();
160	<	try {
161	<	long s = lock.readLock();
162	<	lock.unlockRead(s);
163	<	lock.unlockRead(s);
164	<	shouldThrow();
165	<	} catch (IllegalMonitorStateException success) {}
160	>
161	>	for (Function<StampedLock, Long> readLocker : readLockers())
162	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
163	>	long s = 42;
164	>	for (int i = 0; i < 2; i++) {
165	>	s = assertValid(lock, readLocker.apply(lock));
166	>	assertFalse(lock.isWriteLocked());
167	>	assertTrue(lock.isReadLocked());
168	>	assertEquals(i + 1, lock.getReadLockCount());
169	>	}
170	>	for (int i = 0; i < 2; i++) {
171	>	assertFalse(lock.isWriteLocked());
172	>	assertTrue(lock.isReadLocked());
173	>	assertEquals(2 - i, lock.getReadLockCount());
174	>	readUnlocker.accept(lock, s);
175	>	}
176	>	assertUnlocked(lock);
177	>	}
178		}
179
180		/**
181	<	* read-unlocking an unlocked lock throws IllegalMonitorStateException
181	>	* tryUnlockWrite fails if not write locked
182		*/
183	<	public void testReadUnlock_IMSE2() {
183	>	public void testTryUnlockWrite_failure() {
184		StampedLock lock = new StampedLock();
185	<	try {
186	<	lock.unlockRead(0L);
187	<	shouldThrow();
188	<	} catch (IllegalMonitorStateException success) {}
185	>	assertFalse(lock.tryUnlockWrite());
186	>
187	>	for (Function<StampedLock, Long> readLocker : readLockers())
188	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
189	>	long s = assertValid(lock, readLocker.apply(lock));
190	>	assertFalse(lock.tryUnlockWrite());
191	>	assertTrue(lock.isReadLocked());
192	>	readUnlocker.accept(lock, s);
193	>	assertUnlocked(lock);
194	>	}
195		}
196
197		/**
198	<	* read-unlocking after writeLock throws IllegalMonitorStateException
198	>	* tryUnlockRead fails if not read locked
199		*/
200	<	public void testReadUnlock_IMSE3() {
200	>	public void testTryUnlockRead_failure() {
201		StampedLock lock = new StampedLock();
202	<	try {
203	<	long s = lock.writeLock();
204	<	lock.unlockRead(s);
205	<	shouldThrow();
206	<	} catch (IllegalMonitorStateException success) {}
202	>	assertFalse(lock.tryUnlockRead());
203	>
204	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
205	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
206	>	long s = writeLocker.apply(lock);
207	>	assertFalse(lock.tryUnlockRead());
208	>	assertTrue(lock.isWriteLocked());
209	>	writeUnlocker.accept(lock, s);
210	>	assertUnlocked(lock);
211	>	}
212		}
213
214		/**
215	<	* validate(0) fails
215	>	* validate(0L) fails
216		*/
217		public void testValidate0() {
218		StampedLock lock = new StampedLock();
#	Line 231 | Line 220 | public class StampedLockTest extends JSR
220		}
221
222		/**
223	<	* A stamp obtained from a successful lock operation validates
223	>	* A stamp obtained from a successful lock operation validates while the lock is held
224		*/
225	<	public void testValidate() {
226	<	try {
227	<	StampedLock lock = new StampedLock();
228	<	long s = lock.writeLock();
229	<	assertTrue(lock.validate(s));
230	<	lock.unlockWrite(s);
242	<	s = lock.readLock();
243	<	assertTrue(lock.validate(s));
244	<	lock.unlockRead(s);
245	<	assertTrue((s = lock.tryWriteLock()) != 0L);
246	<	assertTrue(lock.validate(s));
247	<	lock.unlockWrite(s);
248	<	assertTrue((s = lock.tryReadLock()) != 0L);
249	<	assertTrue(lock.validate(s));
250	<	lock.unlockRead(s);
251	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
225	>	public void testValidate() throws InterruptedException {
226	>	StampedLock lock = new StampedLock();
227	>
228	>	for (Function<StampedLock, Long> readLocker : readLockers())
229	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
230	>	long s = assertNonZero(readLocker.apply(lock));
231		assertTrue(lock.validate(s));
232	<	lock.unlockWrite(s);
233	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
232	>	readUnlocker.accept(lock, s);
233	>	}
234	>
235	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
236	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
237	>	long s = assertNonZero(writeLocker.apply(lock));
238		assertTrue(lock.validate(s));
239	<	lock.unlockRead(s);
257	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
258	<	} catch (InterruptedException ie) {
259	<	threadUnexpectedException(ie);
239	>	writeUnlocker.accept(lock, s);
240		}
241		}
242
243		/**
244		* A stamp obtained from an unsuccessful lock operation does not validate
245		*/
246	<	public void testValidate2() {
247	<	try {
248	<	StampedLock lock = new StampedLock();
249	<	long s;
250	<	assertTrue((s = lock.writeLock()) != 0L);
251	<	assertTrue(lock.validate(s));
252	<	assertFalse(lock.validate(lock.tryWriteLock()));
253	<	assertFalse(lock.validate(lock.tryWriteLock(100L, MILLISECONDS)));
254	<	assertFalse(lock.validate(lock.tryReadLock()));
255	<	assertFalse(lock.validate(lock.tryReadLock(100L, MILLISECONDS)));
256	<	assertFalse(lock.validate(lock.tryOptimisticRead()));
257	<	lock.unlockWrite(s);
258	<	} catch (InterruptedException ie) {
259	<	threadUnexpectedException(ie);
246	>	public void testValidate2() throws InterruptedException {
247	>	StampedLock lock = new StampedLock();
248	>	long s = assertNonZero(lock.writeLock());
249	>	assertTrue(lock.validate(s));
250	>	assertFalse(lock.validate(lock.tryWriteLock()));
251	>	assertFalse(lock.validate(lock.tryWriteLock(0L, SECONDS)));
252	>	assertFalse(lock.validate(lock.tryReadLock()));
253	>	assertFalse(lock.validate(lock.tryReadLock(0L, SECONDS)));
254	>	assertFalse(lock.validate(lock.tryOptimisticRead()));
255	>	lock.unlockWrite(s);
256	>	}
257	>
258	>	void assertThrowInterruptedExceptionWhenPreInterrupted(Action[] actions) {
259	>	for (Action action : actions) {
260	>	Thread.currentThread().interrupt();
261	>	try {
262	>	action.run();
263	>	shouldThrow();
264	>	}
265	>	catch (InterruptedException success) {}
266	>	catch (Throwable fail) { threadUnexpectedException(fail); }
267	>	assertFalse(Thread.interrupted());
268		}
269		}
270
271		/**
272	<	* writeLockInterruptibly is interruptible
272	>	* interruptible operations throw InterruptedException when pre-interrupted
273		*/
274	<	public void testWriteLockInterruptibly_Interruptible() {
287	<	final CountDownLatch running = new CountDownLatch(1);
274	>	public void testInterruptibleOperationsThrowInterruptedExceptionWhenPreInterrupted() {
275		final StampedLock lock = new StampedLock();
276	<	long s = lock.writeLock();
277	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
278	<	public void realRun() throws InterruptedException {
279	<	running.countDown();
280	<	lock.writeLockInterruptibly();
281	<	}});
282	<	try {
283	<	running.await(); Thread.sleep(SHORT_DELAY_MS);
284	<	t.interrupt();
285	<	awaitTermination(t);
286	<	releaseWriteLock(lock, s);
287	<	} catch (InterruptedException ie) {
288	<	threadUnexpectedException(ie);
276	>
277	>	Action[] interruptibleLockActions = {
278	>	() -> lock.writeLockInterruptibly(),
279	>	() -> lock.tryWriteLock(Long.MIN_VALUE, DAYS),
280	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
281	>	() -> lock.readLockInterruptibly(),
282	>	() -> lock.tryReadLock(Long.MIN_VALUE, DAYS),
283	>	() -> lock.tryReadLock(Long.MAX_VALUE, DAYS),
284	>	() -> lock.asWriteLock().lockInterruptibly(),
285	>	() -> lock.asWriteLock().tryLock(0L, DAYS),
286	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
287	>	() -> lock.asReadLock().lockInterruptibly(),
288	>	() -> lock.asReadLock().tryLock(0L, DAYS),
289	>	() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS),
290	>	};
291	>	shuffle(interruptibleLockActions);
292	>
293	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
294	>	{
295	>	long s = lock.writeLock();
296	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
297	>	lock.unlockWrite(s);
298	>	}
299	>	{
300	>	long s = lock.readLock();
301	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
302	>	lock.unlockRead(s);
303		}
304		}
305
306	+	void assertThrowInterruptedExceptionWhenInterrupted(Action[] actions) {
307	+	int n = actions.length;
308	+	Future<?>[] futures = new Future<?>[n];
309	+	CountDownLatch threadsStarted = new CountDownLatch(n);
310	+	CountDownLatch done = new CountDownLatch(n);
311	+
312	+	for (int i = 0; i < n; i++) {
313	+	Action action = actions[i];
314	+	futures[i] = cachedThreadPool.submit(new CheckedRunnable() {
315	+	public void realRun() throws Throwable {
316	+	threadsStarted.countDown();
317	+	try {
318	+	action.run();
319	+	shouldThrow();
320	+	}
321	+	catch (InterruptedException success) {}
322	+	catch (Throwable fail) { threadUnexpectedException(fail); }
323	+	assertFalse(Thread.interrupted());
324	+	done.countDown();
325	+	}});
326	+	}
327	+
328	+	await(threadsStarted);
329	+	assertEquals(n, done.getCount());
330	+	for (Future<?> future : futures) // Interrupt all the tasks
331	+	future.cancel(true);
332	+	await(done);
333	+	}
334	+
335		/**
336	<	* timed tryWriteLock is interruptible
336	>	* interruptible operations throw InterruptedException when write locked and interrupted
337		*/
338	<	public void testWriteTryLock_Interruptible() {
309	<	final CountDownLatch running = new CountDownLatch(1);
338	>	public void testInterruptibleOperationsThrowInterruptedExceptionWriteLockedInterrupted() {
339		final StampedLock lock = new StampedLock();
340		long s = lock.writeLock();
341	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
342	<	public void realRun() throws InterruptedException {
343	<	running.countDown();
344	<	lock.tryWriteLock(2 * LONG_DELAY_MS, MILLISECONDS);
345	<	}});
346	<	try {
347	<	running.await(); Thread.sleep(SHORT_DELAY_MS);
348	<	t.interrupt();
349	<	awaitTermination(t);
350	<	releaseWriteLock(lock, s);
351	<	} catch (InterruptedException ie) {
352	<	threadUnexpectedException(ie);
353	<	}
341	>
342	>	Action[] interruptibleLockBlockingActions = {
343	>	() -> lock.writeLockInterruptibly(),
344	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
345	>	() -> lock.readLockInterruptibly(),
346	>	() -> lock.tryReadLock(Long.MAX_VALUE, DAYS),
347	>	() -> lock.asWriteLock().lockInterruptibly(),
348	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
349	>	() -> lock.asReadLock().lockInterruptibly(),
350	>	() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS),
351	>	};
352	>	shuffle(interruptibleLockBlockingActions);
353	>
354	>	assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions);
355		}
356
357		/**
358	<	* readLockInterruptibly is interruptible
358	>	* interruptible operations throw InterruptedException when read locked and interrupted
359		*/
360	<	public void testReadLockInterruptibly_Interruptible() {
331	<	final CountDownLatch running = new CountDownLatch(1);
360	>	public void testInterruptibleOperationsThrowInterruptedExceptionReadLockedInterrupted() {
361		final StampedLock lock = new StampedLock();
362	<	long s = lock.writeLock();
363	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
364	<	public void realRun() throws InterruptedException {
365	<	running.countDown();
366	<	lock.readLockInterruptibly();
367	<	}});
368	<	try {
369	<	running.await(); Thread.sleep(SHORT_DELAY_MS);
370	<	t.interrupt();
371	<	awaitTermination(t);
372	<	releaseWriteLock(lock, s);
344	<	} catch (InterruptedException ie) {
345	<	threadUnexpectedException(ie);
346	<	}
362	>	long s = lock.readLock();
363	>
364	>	Action[] interruptibleLockBlockingActions = {
365	>	() -> lock.writeLockInterruptibly(),
366	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
367	>	() -> lock.asWriteLock().lockInterruptibly(),
368	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
369	>	};
370	>	shuffle(interruptibleLockBlockingActions);
371	>
372	>	assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions);
373		}
374
375		/**
376	<	* timed tryReadLock is interruptible
376	>	* Non-interruptible operations ignore and preserve interrupt status
377		*/
378	<	public void testReadTryLock_Interruptible() {
353	<	final CountDownLatch running = new CountDownLatch(1);
378	>	public void testNonInterruptibleOperationsIgnoreInterrupts() {
379		final StampedLock lock = new StampedLock();
380	<	long s = lock.writeLock();
381	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
382	<	public void realRun() throws InterruptedException {
383	<	running.countDown();
384	<	lock.tryReadLock(2 * LONG_DELAY_MS, MILLISECONDS);
385	<	}});
386	<	try {
387	<	running.await(); Thread.sleep(SHORT_DELAY_MS);
388	<	t.interrupt();
389	<	awaitTermination(t);
390	<	releaseWriteLock(lock, s);
391	<	} catch (InterruptedException ie) {
392	<	threadUnexpectedException(ie);
380	>	Thread.currentThread().interrupt();
381	>
382	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
383	>	long s = assertValid(lock, lock.readLock());
384	>	readUnlocker.accept(lock, s);
385	>	s = assertValid(lock, lock.tryReadLock());
386	>	readUnlocker.accept(lock, s);
387	>	}
388	>
389	>	lock.asReadLock().lock();
390	>	lock.asReadLock().unlock();
391	>
392	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
393	>	long s = assertValid(lock, lock.writeLock());
394	>	writeUnlocker.accept(lock, s);
395	>	s = assertValid(lock, lock.tryWriteLock());
396	>	writeUnlocker.accept(lock, s);
397		}
398	+
399	+	lock.asWriteLock().lock();
400	+	lock.asWriteLock().unlock();
401	+
402	+	assertTrue(Thread.interrupted());
403		}
404
405		/**
406		* tryWriteLock on an unlocked lock succeeds
407		*/
408	<	public void testWriteTryLock() {
408	>	public void testTryWriteLock() {
409		final StampedLock lock = new StampedLock();
410		long s = lock.tryWriteLock();
411		assertTrue(s != 0L);
412		assertTrue(lock.isWriteLocked());
413	<	long s2 = lock.tryWriteLock();
380	<	assertEquals(s2, 0L);
413	>	assertEquals(0L, lock.tryWriteLock());
414		releaseWriteLock(lock, s);
415		}
416
417		/**
418		* tryWriteLock fails if locked
419		*/
420	<	public void testWriteTryLockWhenLocked() {
420	>	public void testTryWriteLockWhenLocked() {
421		final StampedLock lock = new StampedLock();
422		long s = lock.writeLock();
423		Thread t = newStartedThread(new CheckedRunnable() {
424		public void realRun() {
425	<	long ws = lock.tryWriteLock();
393	<	assertTrue(ws == 0L);
425	>	assertEquals(0L, lock.tryWriteLock());
426		}});
427
428	+	assertEquals(0L, lock.tryWriteLock());
429		awaitTermination(t);
430		releaseWriteLock(lock, s);
431		}
#	Line 400 | Line 433 | public class StampedLockTest extends JSR
433		/**
434		* tryReadLock fails if write-locked
435		*/
436	<	public void testReadTryLockWhenLocked() {
436	>	public void testTryReadLockWhenLocked() {
437		final StampedLock lock = new StampedLock();
438		long s = lock.writeLock();
439		Thread t = newStartedThread(new CheckedRunnable() {
440		public void realRun() {
441	<	long rs = lock.tryReadLock();
409	<	assertEquals(rs, 0L);
441	>	assertEquals(0L, lock.tryReadLock());
442		}});
443
444	+	assertEquals(0L, lock.tryReadLock());
445		awaitTermination(t);
446		releaseWriteLock(lock, s);
447		}
#	Line 422 | Line 455 | public class StampedLockTest extends JSR
455		Thread t = newStartedThread(new CheckedRunnable() {
456		public void realRun() throws InterruptedException {
457		long s2 = lock.tryReadLock();
458	<	assertTrue(s2 != 0L);
458	>	assertValid(lock, s2);
459		lock.unlockRead(s2);
460		long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS);
461	<	assertTrue(s3 != 0L);
461	>	assertValid(lock, s3);
462		lock.unlockRead(s3);
463		long s4 = lock.readLock();
464	+	assertValid(lock, s4);
465		lock.unlockRead(s4);
466	+	lock.asReadLock().lock();
467	+	lock.asReadLock().unlock();
468	+	lock.asReadLock().lockInterruptibly();
469	+	lock.asReadLock().unlock();
470	+	lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS);
471	+	lock.asReadLock().unlock();
472		}});
473
474		awaitTermination(t);
#	Line 438 | Line 478 | public class StampedLockTest extends JSR
478		/**
479		* A writelock succeeds only after a reading thread unlocks
480		*/
481	<	public void testWriteAfterReadLock() {
481	>	public void testWriteAfterReadLock() throws InterruptedException {
482		final CountDownLatch running = new CountDownLatch(1);
483		final StampedLock lock = new StampedLock();
484		long rs = lock.readLock();
#	Line 448 | Line 488 | public class StampedLockTest extends JSR
488		long s = lock.writeLock();
489		lock.unlockWrite(s);
490		}});
491	<	try {
492	<	running.await(); Thread.sleep(SHORT_DELAY_MS);
493	<	assertFalse(lock.isWriteLocked());
494	<	lock.unlockRead(rs);
495	<	awaitTermination(t);
496	<	assertFalse(lock.isWriteLocked());
497	<	} catch (InterruptedException ie) {
458	<	threadUnexpectedException(ie);
459	<	}
491	>
492	>	running.await();
493	>	waitForThreadToEnterWaitState(t, MEDIUM_DELAY_MS);
494	>	assertFalse(lock.isWriteLocked());
495	>	lock.unlockRead(rs);
496	>	awaitTermination(t);
497	>	assertFalse(lock.isWriteLocked());
498		}
499
500		/**
#	Line 470 | Line 508 | public class StampedLockTest extends JSR
508		long rs = lock.readLock();
509		lock.unlockRead(rs);
510		}});
511	+
512		awaitTermination(t1);
513
514		Thread t2 = newStartedThread(new CheckedRunnable() {
#	Line 477 | Line 516 | public class StampedLockTest extends JSR
516		long ws = lock.writeLock();
517		lock.unlockWrite(ws);
518		}});
519	+
520	+	assertTrue(lock.isReadLocked());
521		assertFalse(lock.isWriteLocked());
522		lock.unlockRead(s);
523		awaitTermination(t2);
#	Line 488 | Line 529 | public class StampedLockTest extends JSR
529		*/
530		public void testReadAfterWriteLock() {
531		final StampedLock lock = new StampedLock();
532	+	final CountDownLatch threadsStarted = new CountDownLatch(2);
533		final long s = lock.writeLock();
534		Thread t1 = newStartedThread(new CheckedRunnable() {
535		public void realRun() {
536	+	threadsStarted.countDown();
537		long rs = lock.readLock();
538		lock.unlockRead(rs);
539		}});
540		Thread t2 = newStartedThread(new CheckedRunnable() {
541		public void realRun() {
542	+	threadsStarted.countDown();
543		long rs = lock.readLock();
544		lock.unlockRead(rs);
545		}});
546
547	+	await(threadsStarted);
548	+	waitForThreadToEnterWaitState(t1, MEDIUM_DELAY_MS);
549	+	waitForThreadToEnterWaitState(t2, MEDIUM_DELAY_MS);
550		releaseWriteLock(lock, s);
551		awaitTermination(t1);
552		awaitTermination(t2);
553		}
554
555		/**
556	<	* tryReadLock succeeds if readlocked but not writelocked
556	>	* tryReadLock succeeds if read locked but not write locked
557		*/
558		public void testTryLockWhenReadLocked() {
559		final StampedLock lock = new StampedLock();
#	Line 514 | Line 561 | public class StampedLockTest extends JSR
561		Thread t = newStartedThread(new CheckedRunnable() {
562		public void realRun() {
563		long rs = lock.tryReadLock();
564	<	threadAssertTrue(rs != 0L);
564	>	assertValid(lock, rs);
565		lock.unlockRead(rs);
566		}});
567
#	Line 523 | Line 570 | public class StampedLockTest extends JSR
570		}
571
572		/**
573	<	* tryWriteLock fails when readlocked
573	>	* tryWriteLock fails when read locked
574		*/
575	<	public void testWriteTryLockWhenReadLocked() {
575	>	public void testTryWriteLockWhenReadLocked() {
576		final StampedLock lock = new StampedLock();
577		long s = lock.readLock();
578		Thread t = newStartedThread(new CheckedRunnable() {
579		public void realRun() {
580	<	long ws = lock.tryWriteLock();
534	<	threadAssertEquals(ws, 0L);
580	>	threadAssertEquals(0L, lock.tryWriteLock());
581		}});
582
583		awaitTermination(t);
#	Line 539 | Line 585 | public class StampedLockTest extends JSR
585		}
586
587		/**
588	<	* timed tryWriteLock times out if locked
588	>	* timed lock operations time out if lock not available
589		*/
590	<	public void testWriteTryLock_Timeout() {
590	>	public void testTimedLock_Timeout() throws Exception {
591	>	ArrayList<Future<?>> futures = new ArrayList<>();
592	>
593	>	// Write locked
594		final StampedLock lock = new StampedLock();
595	<	long s = lock.writeLock();
596	<	Thread t = newStartedThread(new CheckedRunnable() {
595	>	long stamp = lock.writeLock();
596	>	assertEquals(0L, lock.tryReadLock(0L, DAYS));
597	>	assertEquals(0L, lock.tryReadLock(Long.MIN_VALUE, DAYS));
598	>	assertFalse(lock.asReadLock().tryLock(0L, DAYS));
599	>	assertFalse(lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS));
600	>	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
601	>	assertEquals(0L, lock.tryWriteLock(Long.MIN_VALUE, DAYS));
602	>	assertFalse(lock.asWriteLock().tryLock(0L, DAYS));
603	>	assertFalse(lock.asWriteLock().tryLock(Long.MIN_VALUE, DAYS));
604	>
605	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
606		public void realRun() throws InterruptedException {
607		long startTime = System.nanoTime();
608	<	long timeoutMillis = 10;
609	<	long ws = lock.tryWriteLock(timeoutMillis, MILLISECONDS);
610	<	assertEquals(ws, 0L);
553	<	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
554	<	}});
608	>	assertEquals(0L, lock.tryWriteLock(timeoutMillis(), MILLISECONDS));
609	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
610	>	}}));
611
612	<	awaitTermination(t);
613	<	releaseWriteLock(lock, s);
614	<	}
612	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
613	>	public void realRun() throws InterruptedException {
614	>	long startTime = System.nanoTime();
615	>	assertEquals(0L, lock.tryReadLock(timeoutMillis(), MILLISECONDS));
616	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
617	>	}}));
618	>
619	>	// Read locked
620	>	final StampedLock lock2 = new StampedLock();
621	>	long stamp2 = lock2.readLock();
622	>	assertEquals(0L, lock2.tryWriteLock(0L, DAYS));
623	>	assertEquals(0L, lock2.tryWriteLock(Long.MIN_VALUE, DAYS));
624	>	assertFalse(lock2.asWriteLock().tryLock(0L, DAYS));
625	>	assertFalse(lock2.asWriteLock().tryLock(Long.MIN_VALUE, DAYS));
626
627	<	/**
561	<	* timed tryReadLock times out if write-locked
562	<	*/
563	<	public void testReadTryLock_Timeout() {
564	<	final StampedLock lock = new StampedLock();
565	<	long s = lock.writeLock();
566	<	Thread t = newStartedThread(new CheckedRunnable() {
627	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
628		public void realRun() throws InterruptedException {
629		long startTime = System.nanoTime();
630	<	long timeoutMillis = 10;
631	<	long rs = lock.tryReadLock(timeoutMillis, MILLISECONDS);
632	<	assertEquals(rs, 0L);
633	<	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
634	<	}});
635	<
636	<	awaitTermination(t);
637	<	assertTrue(lock.isWriteLocked());
638	<	lock.unlockWrite(s);
630	>	assertEquals(0L, lock2.tryWriteLock(timeoutMillis(), MILLISECONDS));
631	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
632	>	}}));
633	>
634	>	for (Future<?> future : futures)
635	>	assertNull(future.get());
636	>
637	>	releaseWriteLock(lock, stamp);
638	>	releaseReadLock(lock2, stamp2);
639		}
640
641		/**
642	<	* writeLockInterruptibly succeeds if unlocked, else is interruptible
642	>	* writeLockInterruptibly succeeds if unlocked
643		*/
644	<	public void testWriteLockInterruptibly() {
584	<	final CountDownLatch running = new CountDownLatch(1);
644	>	public void testWriteLockInterruptibly() throws InterruptedException {
645		final StampedLock lock = new StampedLock();
646	<	long s = 0L;
647	<	try {
648	<	s = lock.writeLockInterruptibly();
589	<	} catch (InterruptedException ie) {
590	<	threadUnexpectedException(ie);
591	<	}
592	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
593	<	public void realRun() throws InterruptedException {
594	<	running.countDown();
595	<	lock.writeLockInterruptibly();
596	<	}});
597	<
598	<	try {
599	<	running.await(); Thread.sleep(SHORT_DELAY_MS);
600	<	t.interrupt();
601	<	assertTrue(lock.isWriteLocked());
602	<	awaitTermination(t);
603	<	releaseWriteLock(lock, s);
604	<	} catch (InterruptedException ie) {
605	<	threadUnexpectedException(ie);
606	<	}
607	<
646	>	long s = lock.writeLockInterruptibly();
647	>	assertTrue(lock.isWriteLocked());
648	>	releaseWriteLock(lock, s);
649		}
650
651		/**
652	<	* readLockInterruptibly succeeds if lock free else is interruptible
652	>	* readLockInterruptibly succeeds if lock free
653		*/
654	<	public void testReadLockInterruptibly() {
614	<	final CountDownLatch running = new CountDownLatch(1);
654	>	public void testReadLockInterruptibly() throws InterruptedException {
655		final StampedLock lock = new StampedLock();
656	<	long s = 0L;
657	<	try {
658	<	s = lock.readLockInterruptibly();
659	<	lock.unlockRead(s);
660	<	s = lock.writeLockInterruptibly();
661	<	} catch (InterruptedException ie) {
662	<	threadUnexpectedException(ie);
663	<	}
624	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
625	<	public void realRun() throws InterruptedException {
626	<	running.countDown();
627	<	lock.readLockInterruptibly();
628	<	}});
629	<	try {
630	<	running.await(); Thread.sleep(SHORT_DELAY_MS);
631	<	t.interrupt();
632	<	awaitTermination(t);
633	<	releaseWriteLock(lock, s);
634	<	} catch (InterruptedException ie) {
635	<	threadUnexpectedException(ie);
636	<	}
656	>
657	>	long s = assertValid(lock, lock.readLockInterruptibly());
658	>	assertTrue(lock.isReadLocked());
659	>	lock.unlockRead(s);
660	>
661	>	lock.asReadLock().lockInterruptibly();
662	>	assertTrue(lock.isReadLocked());
663	>	lock.asReadLock().unlock();
664		}
665
666		/**
#	Line 665 | Line 692 | public class StampedLockTest extends JSR
692		}
693
694		/**
695	<	* tryOptimisticRead succeeds and validates if unlocked, fails if locked
695	>	* tryOptimisticRead succeeds and validates if unlocked, fails if
696	>	* exclusively locked
697		*/
698	<	public void testValidateOptimistic() {
699	<	try {
700	<	StampedLock lock = new StampedLock();
701	<	long s, p;
702	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
703	<	assertTrue(lock.validate(p));
704	<	assertTrue((s = lock.writeLock()) != 0L);
705	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
706	<	assertTrue(lock.validate(s));
707	<	lock.unlockWrite(s);
708	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
709	<	assertTrue(lock.validate(p));
710	<	assertTrue((s = lock.readLock()) != 0L);
711	<	assertTrue(lock.validate(s));
712	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
685	<	assertTrue(lock.validate(p));
686	<	lock.unlockRead(s);
687	<	assertTrue((s = lock.tryWriteLock()) != 0L);
688	<	assertTrue(lock.validate(s));
689	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
690	<	lock.unlockWrite(s);
691	<	assertTrue((s = lock.tryReadLock()) != 0L);
692	<	assertTrue(lock.validate(s));
693	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
694	<	lock.unlockRead(s);
698	>	public void testValidateOptimistic() throws InterruptedException {
699	>	StampedLock lock = new StampedLock();
700	>
701	>	assertValid(lock, lock.tryOptimisticRead());
702	>
703	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
704	>	long s = assertValid(lock, writeLocker.apply(lock));
705	>	assertEquals(0L, lock.tryOptimisticRead());
706	>	releaseWriteLock(lock, s);
707	>	}
708	>
709	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
710	>	long s = assertValid(lock, readLocker.apply(lock));
711	>	long p = assertValid(lock, lock.tryOptimisticRead());
712	>	releaseReadLock(lock, s);
713		assertTrue(lock.validate(p));
696	–	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
697	–	assertFalse((p = lock.tryOptimisticRead()) != 0L);
698	–	assertTrue(lock.validate(s));
699	–	lock.unlockWrite(s);
700	–	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
701	–	assertTrue(lock.validate(s));
702	–	assertTrue((p = lock.tryOptimisticRead()) != 0L);
703	–	lock.unlockRead(s);
704	–	assertTrue((p = lock.tryOptimisticRead()) != 0L);
705	–	} catch (InterruptedException ie) {
706	–	threadUnexpectedException(ie);
714		}
715	+
716	+	assertValid(lock, lock.tryOptimisticRead());
717		}
718
719		/**
720		* tryOptimisticRead stamp does not validate if a write lock intervenes
721		*/
722		public void testValidateOptimisticWriteLocked() {
723	<	StampedLock lock = new StampedLock();
724	<	long s, p;
725	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
717	<	assertTrue((s = lock.writeLock()) != 0L);
723	>	final StampedLock lock = new StampedLock();
724	>	final long p = assertValid(lock, lock.tryOptimisticRead());
725	>	final long s = assertValid(lock, lock.writeLock());
726		assertFalse(lock.validate(p));
727	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
727	>	assertEquals(0L, lock.tryOptimisticRead());
728		assertTrue(lock.validate(s));
729		lock.unlockWrite(s);
730		}
#	Line 725 | Line 733 | public class StampedLockTest extends JSR
733		* tryOptimisticRead stamp does not validate if a write lock
734		* intervenes in another thread
735		*/
736	<	public void testValidateOptimisticWriteLocked2() {
736	>	public void testValidateOptimisticWriteLocked2()
737	>	throws InterruptedException {
738		final CountDownLatch running = new CountDownLatch(1);
739		final StampedLock lock = new StampedLock();
740	<	long s, p;
741	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
740	>	final long p = assertValid(lock, lock.tryOptimisticRead());
741	>
742		Thread t = newStartedThread(new CheckedInterruptedRunnable() {
743	<	public void realRun() throws InterruptedException {
744	<	lock.writeLockInterruptibly();
745	<	running.countDown();
746	<	lock.writeLockInterruptibly();
747	<	}});
748	<	try {
749	<	running.await();
750	<	assertFalse(lock.validate(p));
751	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
752	<	t.interrupt();
753	<	awaitTermination(t);
745	<	} catch (InterruptedException ie) {
746	<	threadUnexpectedException(ie);
747	<	}
743	>	public void realRun() throws InterruptedException {
744	>	lock.writeLockInterruptibly();
745	>	running.countDown();
746	>	lock.writeLockInterruptibly();
747	>	}});
748	>
749	>	running.await();
750	>	assertFalse(lock.validate(p));
751	>	assertEquals(0L, lock.tryOptimisticRead());
752	>	t.interrupt();
753	>	awaitTermination(t);
754		}
755
756		/**
757	<	* tryConvertToOptimisticRead succeeds and validates if successfully locked,
758	<	*/
759	<	public void testTryConvertToOptimisticRead() {
760	<	try {
761	<	StampedLock lock = new StampedLock();
762	<	long s, p;
763	<	s = 0L;
764	<	assertFalse((p = lock.tryConvertToOptimisticRead(s)) != 0L);
765	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
766	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
767	<	assertTrue((s = lock.writeLock()) != 0L);
768	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
769	<	assertTrue(lock.validate(p));
770	<	assertTrue((s = lock.readLock()) != 0L);
771	<	assertTrue(lock.validate(s));
766	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
767	<	assertTrue(lock.validate(p));
768	<	assertTrue((s = lock.tryWriteLock()) != 0L);
769	<	assertTrue(lock.validate(s));
770	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
771	<	assertTrue(lock.validate(p));
772	<	assertTrue((s = lock.tryReadLock()) != 0L);
773	<	assertTrue(lock.validate(s));
774	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
757	>	* tryConvertToOptimisticRead succeeds and validates if successfully locked
758	>	*/
759	>	public void testTryConvertToOptimisticRead() throws InterruptedException {
760	>	StampedLock lock = new StampedLock();
761	>	long s, p, q;
762	>	assertEquals(0L, lock.tryConvertToOptimisticRead(0L));
763	>
764	>	s = assertValid(lock, lock.tryOptimisticRead());
765	>	assertEquals(s, lock.tryConvertToOptimisticRead(s));
766	>	assertTrue(lock.validate(s));
767	>
768	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
769	>	s = assertValid(lock, writeLocker.apply(lock));
770	>	p = assertValid(lock, lock.tryConvertToOptimisticRead(s));
771	>	assertFalse(lock.validate(s));
772		assertTrue(lock.validate(p));
773	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
774	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
773	>	assertUnlocked(lock);
774	>	}
775	>
776	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
777	>	s = assertValid(lock, readLocker.apply(lock));
778	>	q = assertValid(lock, lock.tryOptimisticRead());
779	>	assertEquals(q, lock.tryConvertToOptimisticRead(q));
780	>	assertTrue(lock.validate(q));
781	>	assertTrue(lock.isReadLocked());
782	>	p = assertValid(lock, lock.tryConvertToOptimisticRead(s));
783		assertTrue(lock.validate(p));
779	–	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
784		assertTrue(lock.validate(s));
785	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
786	<	assertTrue(lock.validate(p));
787	<	} catch (InterruptedException ie) {
784	<	threadUnexpectedException(ie);
785	>	assertUnlocked(lock);
786	>	assertEquals(q, lock.tryConvertToOptimisticRead(q));
787	>	assertTrue(lock.validate(q));
788		}
789		}
790
791		/**
792	<	* tryConvertToReadLock succeeds and validates if successfully locked
790	<	* or lock free;
792	>	* tryConvertToReadLock succeeds for valid stamps
793		*/
794	<	public void testTryConvertToReadLock() {
795	<	try {
796	<	StampedLock lock = new StampedLock();
797	<	long s, p;
798	<	s = 0L;
799	<	assertFalse((p = lock.tryConvertToReadLock(s)) != 0L);
800	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
801	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
802	<	lock.unlockRead(p);
803	<	assertTrue((s = lock.writeLock()) != 0L);
804	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
805	<	assertTrue(lock.validate(p));
806	<	lock.unlockRead(p);
807	<	assertTrue((s = lock.readLock()) != 0L);
808	<	assertTrue(lock.validate(s));
809	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
810	<	assertTrue(lock.validate(p));
811	<	lock.unlockRead(p);
812	<	assertTrue((s = lock.tryWriteLock()) != 0L);
813	<	assertTrue(lock.validate(s));
814	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
815	<	assertTrue(lock.validate(p));
816	<	lock.unlockRead(p);
817	<	assertTrue((s = lock.tryReadLock()) != 0L);
818	<	assertTrue(lock.validate(s));
819	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
820	<	assertTrue(lock.validate(p));
821	<	lock.unlockRead(p);
822	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
823	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
824	<	assertTrue(lock.validate(p));
825	<	lock.unlockRead(p);
826	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
827	<	assertTrue(lock.validate(s));
828	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
829	<	assertTrue(lock.validate(p));
830	<	lock.unlockRead(p);
831	<	} catch (InterruptedException ie) {
832	<	threadUnexpectedException(ie);
794	>	public void testTryConvertToReadLock() throws InterruptedException {
795	>	StampedLock lock = new StampedLock();
796	>	long s, p;
797	>
798	>	assertEquals(0L, lock.tryConvertToReadLock(0L));
799	>
800	>	s = assertValid(lock, lock.tryOptimisticRead());
801	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
802	>	assertTrue(lock.isReadLocked());
803	>	assertEquals(1, lock.getReadLockCount());
804	>	assertTrue(lock.validate(s));
805	>	lock.unlockRead(p);
806	>
807	>	s = assertValid(lock, lock.tryOptimisticRead());
808	>	lock.readLock();
809	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
810	>	assertTrue(lock.isReadLocked());
811	>	assertEquals(2, lock.getReadLockCount());
812	>	lock.unlockRead(p);
813	>	lock.unlockRead(p);
814	>	assertUnlocked(lock);
815	>
816	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
817	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
818	>	s = assertValid(lock, writeLocker.apply(lock));
819	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
820	>	assertFalse(lock.validate(s));
821	>	assertTrue(lock.isReadLocked());
822	>	assertEquals(1, lock.getReadLockCount());
823	>	readUnlocker.accept(lock, p);
824	>	}
825	>
826	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
827	>	s = assertValid(lock, readLocker.apply(lock));
828	>	assertEquals(s, lock.tryConvertToReadLock(s));
829	>	assertTrue(lock.validate(s));
830	>	assertTrue(lock.isReadLocked());
831	>	assertEquals(1, lock.getReadLockCount());
832	>	readUnlocker.accept(lock, s);
833	>	}
834		}
835		}
836
837		/**
838	<	* tryConvertToWriteLock succeeds and validates if successfully locked
839	<	* or lock free;
840	<	*/
841	<	public void testTryConvertToWriteLock() {
842	<	try {
843	<	StampedLock lock = new StampedLock();
844	<	long s, p;
845	<	s = 0L;
846	<	assertFalse((p = lock.tryConvertToWriteLock(s)) != 0L);
847	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
848	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
849	<	lock.unlockWrite(p);
850	<	assertTrue((s = lock.writeLock()) != 0L);
851	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
852	<	assertTrue(lock.validate(p));
853	<	lock.unlockWrite(p);
854	<	assertTrue((s = lock.readLock()) != 0L);
855	<	assertTrue(lock.validate(s));
856	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
857	<	assertTrue(lock.validate(p));
858	<	lock.unlockWrite(p);
859	<	assertTrue((s = lock.tryWriteLock()) != 0L);
860	<	assertTrue(lock.validate(s));
861	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
862	<	assertTrue(lock.validate(p));
863	<	lock.unlockWrite(p);
864	<	assertTrue((s = lock.tryReadLock()) != 0L);
865	<	assertTrue(lock.validate(s));
866	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
867	<	assertTrue(lock.validate(p));
868	<	lock.unlockWrite(p);
869	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
870	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
871	<	assertTrue(lock.validate(p));
872	<	lock.unlockWrite(p);
873	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
838	>	* tryConvertToWriteLock succeeds if lock available; fails if multiply read locked
839	>	*/
840	>	public void testTryConvertToWriteLock() throws InterruptedException {
841	>	StampedLock lock = new StampedLock();
842	>	long s, p;
843	>
844	>	assertEquals(0L, lock.tryConvertToWriteLock(0L));
845	>
846	>	assertTrue((s = lock.tryOptimisticRead()) != 0L);
847	>	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
848	>	assertTrue(lock.isWriteLocked());
849	>	lock.unlockWrite(p);
850	>
851	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
852	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
853	>	s = assertValid(lock, writeLocker.apply(lock));
854	>	assertEquals(s, lock.tryConvertToWriteLock(s));
855	>	assertTrue(lock.validate(s));
856	>	assertTrue(lock.isWriteLocked());
857	>	writeUnlocker.accept(lock, s);
858	>	}
859	>
860	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
861	>	s = assertValid(lock, readLocker.apply(lock));
862	>	p = assertValid(lock, lock.tryConvertToWriteLock(s));
863	>	assertFalse(lock.validate(s));
864	>	assertTrue(lock.validate(p));
865	>	assertTrue(lock.isWriteLocked());
866	>	writeUnlocker.accept(lock, p);
867	>	}
868	>	}
869	>
870	>	// failure if multiply read locked
871	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
872	>	s = assertValid(lock, readLocker.apply(lock));
873	>	p = assertValid(lock, readLocker.apply(lock));
874	>	assertEquals(0L, lock.tryConvertToWriteLock(s));
875		assertTrue(lock.validate(s));
872	–	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
876		assertTrue(lock.validate(p));
877	<	lock.unlockWrite(p);
878	<	} catch (InterruptedException ie) {
879	<	threadUnexpectedException(ie);
877	>	assertEquals(2, lock.getReadLockCount());
878	>	lock.unlock(p);
879	>	lock.unlock(s);
880	>	assertUnlocked(lock);
881		}
882		}
883
884		/**
885		* asWriteLock can be locked and unlocked
886		*/
887	<	public void testAsWriteLock() {
887	>	public void testAsWriteLock() throws Throwable {
888		StampedLock sl = new StampedLock();
889		Lock lock = sl.asWriteLock();
890	<	lock.lock();
891	<	assertFalse(lock.tryLock());
892	<	lock.unlock();
893	<	assertTrue(lock.tryLock());
890	>	for (Action locker : lockLockers(lock)) {
891	>	locker.run();
892	>	assertTrue(sl.isWriteLocked());
893	>	assertFalse(sl.isReadLocked());
894	>	assertFalse(lock.tryLock());
895	>	lock.unlock();
896	>	assertUnlocked(sl);
897	>	}
898		}
899
900		/**
901		* asReadLock can be locked and unlocked
902		*/
903	<	public void testAsReadLock() {
903	>	public void testAsReadLock() throws Throwable {
904		StampedLock sl = new StampedLock();
905		Lock lock = sl.asReadLock();
906	<	lock.lock();
907	<	lock.unlock();
908	<	assertTrue(lock.tryLock());
906	>	for (Action locker : lockLockers(lock)) {
907	>	locker.run();
908	>	assertTrue(sl.isReadLocked());
909	>	assertFalse(sl.isWriteLocked());
910	>	assertEquals(1, sl.getReadLockCount());
911	>	locker.run();
912	>	assertTrue(sl.isReadLocked());
913	>	assertEquals(2, sl.getReadLockCount());
914	>	lock.unlock();
915	>	lock.unlock();
916	>	assertUnlocked(sl);
917	>	}
918		}
919
920		/**
921		* asReadWriteLock.writeLock can be locked and unlocked
922		*/
923	<	public void testAsReadWriteLockWriteLock() {
923	>	public void testAsReadWriteLockWriteLock() throws Throwable {
924		StampedLock sl = new StampedLock();
925		Lock lock = sl.asReadWriteLock().writeLock();
926	<	lock.lock();
927	<	assertFalse(lock.tryLock());
928	<	lock.unlock();
929	<	assertTrue(lock.tryLock());
926	>	for (Action locker : lockLockers(lock)) {
927	>	locker.run();
928	>	assertTrue(sl.isWriteLocked());
929	>	assertFalse(sl.isReadLocked());
930	>	assertFalse(lock.tryLock());
931	>	lock.unlock();
932	>	assertUnlocked(sl);
933	>	}
934		}
935
936		/**
937		* asReadWriteLock.readLock can be locked and unlocked
938		*/
939	<	public void testAsReadWriteLockReadLock() {
939	>	public void testAsReadWriteLockReadLock() throws Throwable {
940		StampedLock sl = new StampedLock();
941		Lock lock = sl.asReadWriteLock().readLock();
942	<	lock.lock();
943	<	lock.unlock();
944	<	assertTrue(lock.tryLock());
942	>	for (Action locker : lockLockers(lock)) {
943	>	locker.run();
944	>	assertTrue(sl.isReadLocked());
945	>	assertFalse(sl.isWriteLocked());
946	>	assertEquals(1, sl.getReadLockCount());
947	>	locker.run();
948	>	assertTrue(sl.isReadLocked());
949	>	assertEquals(2, sl.getReadLockCount());
950	>	lock.unlock();
951	>	lock.unlock();
952	>	assertUnlocked(sl);
953	>	}
954		}
955
956	+	/**
957	+	* Lock.newCondition throws UnsupportedOperationException
958	+	*/
959	+	public void testLockViewsDoNotSupportConditions() {
960	+	StampedLock sl = new StampedLock();
961	+	assertThrows(UnsupportedOperationException.class,
962	+	() -> sl.asWriteLock().newCondition(),
963	+	() -> sl.asReadLock().newCondition(),
964	+	() -> sl.asReadWriteLock().writeLock().newCondition(),
965	+	() -> sl.asReadWriteLock().readLock().newCondition());
966	+	}
967	+
968	+	/**
969	+	* Passing optimistic read stamps to unlock operations result in
970	+	* IllegalMonitorStateException
971	+	*/
972	+	public void testCannotUnlockOptimisticReadStamps() {
973	+	Runnable[] actions = {
974	+	() -> {
975	+	StampedLock sl = new StampedLock();
976	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
977	+	sl.unlockRead(stamp);
978	+	},
979	+	() -> {
980	+	StampedLock sl = new StampedLock();
981	+	long stamp = sl.tryOptimisticRead();
982	+	sl.unlock(stamp);
983	+	},
984	+
985	+	() -> {
986	+	StampedLock sl = new StampedLock();
987	+	long stamp = sl.tryOptimisticRead();
988	+	sl.writeLock();
989	+	sl.unlock(stamp);
990	+	},
991	+	() -> {
992	+	StampedLock sl = new StampedLock();
993	+	sl.readLock();
994	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
995	+	sl.unlockRead(stamp);
996	+	},
997	+	() -> {
998	+	StampedLock sl = new StampedLock();
999	+	sl.readLock();
1000	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
1001	+	sl.unlock(stamp);
1002	+	},
1003	+
1004	+	() -> {
1005	+	StampedLock sl = new StampedLock();
1006	+	long stamp = sl.tryConvertToOptimisticRead(sl.writeLock());
1007	+	assertValid(sl, stamp);
1008	+	sl.writeLock();
1009	+	sl.unlockWrite(stamp);
1010	+	},
1011	+	() -> {
1012	+	StampedLock sl = new StampedLock();
1013	+	long stamp = sl.tryConvertToOptimisticRead(sl.writeLock());
1014	+	sl.writeLock();
1015	+	sl.unlock(stamp);
1016	+	},
1017	+	() -> {
1018	+	StampedLock sl = new StampedLock();
1019	+	long stamp = sl.tryConvertToOptimisticRead(sl.writeLock());
1020	+	sl.readLock();
1021	+	sl.unlockRead(stamp);
1022	+	},
1023	+	() -> {
1024	+	StampedLock sl = new StampedLock();
1025	+	long stamp = sl.tryConvertToOptimisticRead(sl.writeLock());
1026	+	sl.readLock();
1027	+	sl.unlock(stamp);
1028	+	},
1029	+
1030	+	() -> {
1031	+	StampedLock sl = new StampedLock();
1032	+	long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1033	+	assertValid(sl, stamp);
1034	+	sl.writeLock();
1035	+	sl.unlockWrite(stamp);
1036	+	},
1037	+	() -> {
1038	+	StampedLock sl = new StampedLock();
1039	+	long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1040	+	sl.writeLock();
1041	+	sl.unlock(stamp);
1042	+	},
1043	+	() -> {
1044	+	StampedLock sl = new StampedLock();
1045	+	long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1046	+	sl.readLock();
1047	+	sl.unlockRead(stamp);
1048	+	},
1049	+	() -> {
1050	+	StampedLock sl = new StampedLock();
1051	+	sl.readLock();
1052	+	long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1053	+	assertValid(sl, stamp);
1054	+	sl.readLock();
1055	+	sl.unlockRead(stamp);
1056	+	},
1057	+	() -> {
1058	+	StampedLock sl = new StampedLock();
1059	+	long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1060	+	sl.readLock();
1061	+	sl.unlock(stamp);
1062	+	},
1063	+	() -> {
1064	+	StampedLock sl = new StampedLock();
1065	+	sl.readLock();
1066	+	long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1067	+	sl.readLock();
1068	+	sl.unlock(stamp);
1069	+	},
1070	+	};
1071	+
1072	+	assertThrows(IllegalMonitorStateException.class, actions);
1073	+	}
1074	+
1075	+	static long writeLockInterruptiblyUninterrupted(StampedLock sl) {
1076	+	try { return sl.writeLockInterruptibly(); }
1077	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1078	+	}
1079	+
1080	+	static long tryWriteLockUninterrupted(StampedLock sl, long time, TimeUnit unit) {
1081	+	try { return sl.tryWriteLock(time, unit); }
1082	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1083	+	}
1084	+
1085	+	static long readLockInterruptiblyUninterrupted(StampedLock sl) {
1086	+	try { return sl.readLockInterruptibly(); }
1087	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1088	+	}
1089	+
1090	+	static long tryReadLockUninterrupted(StampedLock sl, long time, TimeUnit unit) {
1091	+	try { return sl.tryReadLock(time, unit); }
1092	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1093	+	}
1094	+
1095	+	/**
1096	+	* Invalid stamps result in IllegalMonitorStateException
1097	+	*/
1098	+	public void testInvalidStampsThrowIllegalMonitorStateException() {
1099	+	final StampedLock sl = new StampedLock();
1100	+
1101	+	assertThrows(IllegalMonitorStateException.class,
1102	+	() -> sl.unlockWrite(0L),
1103	+	() -> sl.unlockRead(0L),
1104	+	() -> sl.unlock(0L));
1105	+
1106	+	final long optimisticStamp = sl.tryOptimisticRead();
1107	+	final long readStamp = sl.readLock();
1108	+	sl.unlockRead(readStamp);
1109	+	final long writeStamp = sl.writeLock();
1110	+	sl.unlockWrite(writeStamp);
1111	+	assertTrue(optimisticStamp != 0L && readStamp != 0L && writeStamp != 0L);
1112	+	final long[] noLongerValidStamps = { optimisticStamp, readStamp, writeStamp };
1113	+	final Runnable assertNoLongerValidStampsThrow = () -> {
1114	+	for (long noLongerValidStamp : noLongerValidStamps)
1115	+	assertThrows(IllegalMonitorStateException.class,
1116	+	() -> sl.unlockWrite(noLongerValidStamp),
1117	+	() -> sl.unlockRead(noLongerValidStamp),
1118	+	() -> sl.unlock(noLongerValidStamp));
1119	+	};
1120	+	assertNoLongerValidStampsThrow.run();
1121	+
1122	+	for (Function<StampedLock, Long> readLocker : readLockers())
1123	+	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
1124	+	final long stamp = readLocker.apply(sl);
1125	+	assertValid(sl, stamp);
1126	+	assertNoLongerValidStampsThrow.run();
1127	+	assertThrows(IllegalMonitorStateException.class,
1128	+	() -> sl.unlockWrite(stamp),
1129	+	() -> sl.unlockRead(sl.tryOptimisticRead()),
1130	+	() -> sl.unlockRead(0L));
1131	+	readUnlocker.accept(sl, stamp);
1132	+	assertUnlocked(sl);
1133	+	assertNoLongerValidStampsThrow.run();
1134	+	}
1135	+
1136	+	for (Function<StampedLock, Long> writeLocker : writeLockers())
1137	+	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
1138	+	final long stamp = writeLocker.apply(sl);
1139	+	assertValid(sl, stamp);
1140	+	assertNoLongerValidStampsThrow.run();
1141	+	assertThrows(IllegalMonitorStateException.class,
1142	+	() -> sl.unlockRead(stamp),
1143	+	() -> sl.unlockWrite(0L));
1144	+	writeUnlocker.accept(sl, stamp);
1145	+	assertUnlocked(sl);
1146	+	assertNoLongerValidStampsThrow.run();
1147	+	}
1148	+	}
1149	+
1150	+	/**
1151	+	* Read locks can be very deeply nested
1152	+	*/
1153	+	public void testDeeplyNestedReadLocks() {
1154	+	final StampedLock lock = new StampedLock();
1155	+	final int depth = 300;
1156	+	final long[] stamps = new long[depth];
1157	+	final List<Function<StampedLock, Long>> readLockers = readLockers();
1158	+	final List<BiConsumer<StampedLock, Long>> readUnlockers = readUnlockers();
1159	+	for (int i = 0; i < depth; i++) {
1160	+	Function<StampedLock, Long> readLocker
1161	+	= readLockers.get(i % readLockers.size());
1162	+	long stamp = readLocker.apply(lock);
1163	+	assertEquals(i + 1, lock.getReadLockCount());
1164	+	assertTrue(lock.isReadLocked());
1165	+	stamps[i] = stamp;
1166	+	}
1167	+	for (int i = 0; i < depth; i++) {
1168	+	BiConsumer<StampedLock, Long> readUnlocker
1169	+	= readUnlockers.get(i % readUnlockers.size());
1170	+	assertEquals(depth - i, lock.getReadLockCount());
1171	+	assertTrue(lock.isReadLocked());
1172	+	readUnlocker.accept(lock, stamps[depth - 1 - i]);
1173	+	}
1174	+	assertUnlocked(lock);
1175	+	}
1176		}

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