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

Comparing jsr166/src/test/tck/StampedLockTest.java (file contents):
Revision 1.18 by jsr166, Tue Jun 7 02:12:18 2016 UTC vs.
Revision 1.42 by jsr166, Mon Nov 27 23:38:11 2017 UTC

#	Line 5 | Line 5
5		* http://creativecommons.org/publicdomain/zero/1.0/
6		*/
7
8	+	import static java.util.concurrent.TimeUnit.DAYS;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10
11	+	import static java.util.concurrent.locks.StampedLock.isLockStamp;
12	+	import static java.util.concurrent.locks.StampedLock.isOptimisticReadStamp;
13	+	import static java.util.concurrent.locks.StampedLock.isReadLockStamp;
14	+	import static java.util.concurrent.locks.StampedLock.isWriteLockStamp;
15	+
16	+	import java.util.ArrayList;
17	+	import java.util.List;
18		import java.util.concurrent.CountDownLatch;
19	+	import java.util.concurrent.Future;
20	+	import java.util.concurrent.TimeUnit;
21		import java.util.concurrent.locks.Lock;
22		import java.util.concurrent.locks.StampedLock;
23	+	import java.util.function.BiConsumer;
24	+	import java.util.function.Function;
25
26		import junit.framework.Test;
27		import junit.framework.TestSuite;
#	Line 23 | Line 35 | public class StampedLockTest extends JSR
35		}
36
37		/**
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	–	/**
38		* Releases write lock, checking isWriteLocked before and after
39		*/
40	<	void releaseWriteLock(StampedLock lock, long s) {
40	>	void releaseWriteLock(StampedLock lock, long stamp) {
41		assertTrue(lock.isWriteLocked());
42	<	lock.unlockWrite(s);
42	>	assertValid(lock, stamp);
43	>	lock.unlockWrite(stamp);
44		assertFalse(lock.isWriteLocked());
45	+	assertFalse(lock.validate(stamp));
46		}
47
48		/**
49	<	* Constructed StampedLock is in unlocked state
49	>	* Releases read lock, checking isReadLocked before and after
50		*/
51	<	public void testConstructor() {
52	<	StampedLock lock;
53	<	lock = new StampedLock();
54	<	assertFalse(lock.isWriteLocked());
51	>	void releaseReadLock(StampedLock lock, long stamp) {
52	>	assertTrue(lock.isReadLocked());
53	>	assertValid(lock, stamp);
54	>	lock.unlockRead(stamp);
55		assertFalse(lock.isReadLocked());
56	<	assertEquals(lock.getReadLockCount(), 0);
56	>	assertTrue(lock.validate(stamp));
57		}
58
59	<	/**
60	<	* write-locking and read-locking an unlocked lock succeed
61	<	*/
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);
59	>	long assertNonZero(long v) {
60	>	assertTrue(v != 0L);
61	>	return v;
62		}
63
64	<	/**
65	<	* unlock releases either a read or write lock
66	<	*/
67	<	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);
64	>	long assertValid(StampedLock lock, long stamp) {
65	>	assertTrue(stamp != 0L);
66	>	assertTrue(lock.validate(stamp));
67	>	return stamp;
68		}
69
70	<	/**
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());
70	>	void assertUnlocked(StampedLock lock) {
71		assertFalse(lock.isReadLocked());
132	–	assertEquals(lock.getReadLockCount(), 0);
133	–	assertFalse(lock.tryUnlockRead());
134	–	assertTrue(lock.tryUnlockWrite());
135	–	assertFalse(lock.tryUnlockWrite());
136	–	assertFalse(lock.tryUnlockRead());
137	–	assertFalse(lock.isWriteLocked());
138	–	assertFalse(lock.isReadLocked());
139	–	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());
72		assertFalse(lock.isWriteLocked());
73	<	assertFalse(lock.isReadLocked());
74	<	assertEquals(lock.getReadLockCount(), 0);
73	>	assertEquals(0, lock.getReadLockCount());
74	>	assertValid(lock, lock.tryOptimisticRead());
75		}
76
77	<	/**
78	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
79	<	*/
80	<	public void testWriteUnlock_IMSE() {
81	<	StampedLock lock = new StampedLock();
82	<	try {
83	<	lock.unlockWrite(0L);
84	<	shouldThrow();
85	<	} catch (IllegalMonitorStateException success) {}
77	>	List<Action> lockLockers(Lock lock) {
78	>	List<Action> lockers = new ArrayList<>();
79	>	lockers.add(() -> lock.lock());
80	>	lockers.add(() -> lock.lockInterruptibly());
81	>	lockers.add(() -> lock.tryLock());
82	>	lockers.add(() -> lock.tryLock(Long.MIN_VALUE, DAYS));
83	>	lockers.add(() -> lock.tryLock(0L, DAYS));
84	>	lockers.add(() -> lock.tryLock(Long.MAX_VALUE, DAYS));
85	>	return lockers;
86	>	}
87	>
88	>	List<Function<StampedLock, Long>> readLockers() {
89	>	List<Function<StampedLock, Long>> readLockers = new ArrayList<>();
90	>	readLockers.add(sl -> sl.readLock());
91	>	readLockers.add(sl -> sl.tryReadLock());
92	>	readLockers.add(sl -> readLockInterruptiblyUninterrupted(sl));
93	>	readLockers.add(sl -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
94	>	readLockers.add(sl -> tryReadLockUninterrupted(sl, 0L, DAYS));
95	>	readLockers.add(sl -> sl.tryConvertToReadLock(sl.tryOptimisticRead()));
96	>	return readLockers;
97	>	}
98	>
99	>	List<BiConsumer<StampedLock, Long>> readUnlockers() {
100	>	List<BiConsumer<StampedLock, Long>> readUnlockers = new ArrayList<>();
101	>	readUnlockers.add((sl, stamp) -> sl.unlockRead(stamp));
102	>	readUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockRead()));
103	>	readUnlockers.add((sl, stamp) -> sl.asReadLock().unlock());
104	>	readUnlockers.add((sl, stamp) -> sl.unlock(stamp));
105	>	readUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp)));
106	>	return readUnlockers;
107	>	}
108	>
109	>	List<Function<StampedLock, Long>> writeLockers() {
110	>	List<Function<StampedLock, Long>> writeLockers = new ArrayList<>();
111	>	writeLockers.add(sl -> sl.writeLock());
112	>	writeLockers.add(sl -> sl.tryWriteLock());
113	>	writeLockers.add(sl -> writeLockInterruptiblyUninterrupted(sl));
114	>	writeLockers.add(sl -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
115	>	writeLockers.add(sl -> tryWriteLockUninterrupted(sl, 0L, DAYS));
116	>	writeLockers.add(sl -> sl.tryConvertToWriteLock(sl.tryOptimisticRead()));
117	>	return writeLockers;
118	>	}
119	>
120	>	List<BiConsumer<StampedLock, Long>> writeUnlockers() {
121	>	List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>();
122	>	writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp));
123	>	writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite()));
124	>	writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock());
125	>	writeUnlockers.add((sl, stamp) -> sl.unlock(stamp));
126	>	writeUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp)));
127	>	return writeUnlockers;
128		}
129
130		/**
131	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
131	>	* Constructed StampedLock is in unlocked state
132		*/
133	<	public void testWriteUnlock_IMSE2() {
134	<	StampedLock lock = new StampedLock();
169	<	long s = lock.writeLock();
170	<	lock.unlockWrite(s);
171	<	try {
172	<	lock.unlockWrite(s);
173	<	shouldThrow();
174	<	} catch (IllegalMonitorStateException success) {}
133	>	public void testConstructor() {
134	>	assertUnlocked(new StampedLock());
135		}
136
137		/**
138	<	* write-unlocking after readlock throws IllegalMonitorStateException
138	>	* write-locking, then unlocking, an unlocked lock succeed
139		*/
140	<	public void testWriteUnlock_IMSE3() {
140	>	public void testWriteLock_lockUnlock() {
141		StampedLock lock = new StampedLock();
142	<	long s = lock.readLock();
143	<	try {
144	<	lock.unlockWrite(s);
145	<	shouldThrow();
146	<	} catch (IllegalMonitorStateException success) {}
142	>
143	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
144	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
145	>	assertFalse(lock.isWriteLocked());
146	>	assertFalse(lock.isReadLocked());
147	>	assertEquals(0, lock.getReadLockCount());
148	>
149	>	long s = writeLocker.apply(lock);
150	>	assertValid(lock, s);
151	>	assertTrue(lock.isWriteLocked());
152	>	assertFalse(lock.isReadLocked());
153	>	assertEquals(0, lock.getReadLockCount());
154	>	writeUnlocker.accept(lock, s);
155	>	assertUnlocked(lock);
156	>	}
157		}
158
159		/**
160	<	* read-unlocking an unlocked lock throws IllegalMonitorStateException
160	>	* read-locking, then unlocking, an unlocked lock succeed
161		*/
162	<	public void testReadUnlock_IMSE() {
162	>	public void testReadLock_lockUnlock() {
163		StampedLock lock = new StampedLock();
164	<	long s = lock.readLock();
165	<	lock.unlockRead(s);
166	<	try {
167	<	lock.unlockRead(s);
168	<	shouldThrow();
169	<	} catch (IllegalMonitorStateException success) {}
164	>
165	>	for (Function<StampedLock, Long> readLocker : readLockers())
166	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
167	>	long s = 42;
168	>	for (int i = 0; i < 2; i++) {
169	>	s = assertValid(lock, readLocker.apply(lock));
170	>	assertFalse(lock.isWriteLocked());
171	>	assertTrue(lock.isReadLocked());
172	>	assertEquals(i + 1, lock.getReadLockCount());
173	>	}
174	>	for (int i = 0; i < 2; i++) {
175	>	assertFalse(lock.isWriteLocked());
176	>	assertTrue(lock.isReadLocked());
177	>	assertEquals(2 - i, lock.getReadLockCount());
178	>	readUnlocker.accept(lock, s);
179	>	}
180	>	assertUnlocked(lock);
181	>	}
182		}
183
184		/**
185	<	* read-unlocking an unlocked lock throws IllegalMonitorStateException
185	>	* tryUnlockWrite fails if not write locked
186		*/
187	<	public void testReadUnlock_IMSE2() {
187	>	public void testTryUnlockWrite_failure() {
188		StampedLock lock = new StampedLock();
189	<	try {
190	<	lock.unlockRead(0L);
191	<	shouldThrow();
192	<	} catch (IllegalMonitorStateException success) {}
189	>	assertFalse(lock.tryUnlockWrite());
190	>
191	>	for (Function<StampedLock, Long> readLocker : readLockers())
192	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
193	>	long s = assertValid(lock, readLocker.apply(lock));
194	>	assertFalse(lock.tryUnlockWrite());
195	>	assertTrue(lock.isReadLocked());
196	>	readUnlocker.accept(lock, s);
197	>	assertUnlocked(lock);
198	>	}
199		}
200
201		/**
202	<	* read-unlocking after writeLock throws IllegalMonitorStateException
202	>	* tryUnlockRead fails if not read locked
203		*/
204	<	public void testReadUnlock_IMSE3() {
204	>	public void testTryUnlockRead_failure() {
205		StampedLock lock = new StampedLock();
206	<	long s = lock.writeLock();
207	<	try {
208	<	lock.unlockRead(s);
209	<	shouldThrow();
210	<	} catch (IllegalMonitorStateException success) {}
206	>	assertFalse(lock.tryUnlockRead());
207	>
208	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
209	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
210	>	long s = writeLocker.apply(lock);
211	>	assertFalse(lock.tryUnlockRead());
212	>	assertTrue(lock.isWriteLocked());
213	>	writeUnlocker.accept(lock, s);
214	>	assertUnlocked(lock);
215	>	}
216		}
217
218		/**
219	<	* validate(0) fails
219	>	* validate(0L) fails
220		*/
221		public void testValidate0() {
222		StampedLock lock = new StampedLock();
#	Line 231 | Line 224 | public class StampedLockTest extends JSR
224		}
225
226		/**
227	<	* A stamp obtained from a successful lock operation validates
227	>	* A stamp obtained from a successful lock operation validates while the lock is held
228		*/
229		public void testValidate() throws InterruptedException {
230		StampedLock lock = new StampedLock();
231	<	long s = lock.writeLock();
232	<	assertTrue(lock.validate(s));
233	<	lock.unlockWrite(s);
234	<	s = lock.readLock();
235	<	assertTrue(lock.validate(s));
236	<	lock.unlockRead(s);
237	<	assertTrue((s = lock.tryWriteLock()) != 0L);
238	<	assertTrue(lock.validate(s));
239	<	lock.unlockWrite(s);
240	<	assertTrue((s = lock.tryReadLock()) != 0L);
241	<	assertTrue(lock.validate(s));
242	<	lock.unlockRead(s);
243	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
244	<	assertTrue(lock.validate(s));
252	<	lock.unlockWrite(s);
253	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
254	<	assertTrue(lock.validate(s));
255	<	lock.unlockRead(s);
256	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
231	>
232	>	for (Function<StampedLock, Long> readLocker : readLockers())
233	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
234	>	long s = assertNonZero(readLocker.apply(lock));
235	>	assertTrue(lock.validate(s));
236	>	readUnlocker.accept(lock, s);
237	>	}
238	>
239	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
240	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
241	>	long s = assertNonZero(writeLocker.apply(lock));
242	>	assertTrue(lock.validate(s));
243	>	writeUnlocker.accept(lock, s);
244	>	}
245		}
246
247		/**
#	Line 261 | Line 249 | public class StampedLockTest extends JSR
249		*/
250		public void testValidate2() throws InterruptedException {
251		StampedLock lock = new StampedLock();
252	<	long s;
265	<	assertTrue((s = lock.writeLock()) != 0L);
252	>	long s = assertNonZero(lock.writeLock());
253		assertTrue(lock.validate(s));
254		assertFalse(lock.validate(lock.tryWriteLock()));
255	<	assertFalse(lock.validate(lock.tryWriteLock(10L, MILLISECONDS)));
255	>	assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(),
256	>	randomTimeUnit())));
257		assertFalse(lock.validate(lock.tryReadLock()));
258	<	assertFalse(lock.validate(lock.tryReadLock(10L, MILLISECONDS)));
258	>	assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(),
259	>	randomTimeUnit())));
260		assertFalse(lock.validate(lock.tryOptimisticRead()));
261		lock.unlockWrite(s);
262		}
263
264	+	void assertThrowInterruptedExceptionWhenPreInterrupted(Action[] actions) {
265	+	for (Action action : actions) {
266	+	Thread.currentThread().interrupt();
267	+	try {
268	+	action.run();
269	+	shouldThrow();
270	+	}
271	+	catch (InterruptedException success) {}
272	+	catch (Throwable fail) { threadUnexpectedException(fail); }
273	+	assertFalse(Thread.interrupted());
274	+	}
275	+	}
276	+
277		/**
278	<	* writeLockInterruptibly is interruptible
278	>	* interruptible operations throw InterruptedException when pre-interrupted
279		*/
280	<	public void testWriteLockInterruptibly_Interruptible()
279	<	throws InterruptedException {
280	<	final CountDownLatch running = new CountDownLatch(1);
280	>	public void testInterruptibleOperationsThrowInterruptedExceptionWhenPreInterrupted() {
281		final StampedLock lock = new StampedLock();
282	–	long s = lock.writeLock();
283	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
284	–	public void realRun() throws InterruptedException {
285	–	running.countDown();
286	–	lock.writeLockInterruptibly();
287	–	}});
282
283	<	running.await();
284	<	waitForThreadToEnterWaitState(t, 100);
285	<	t.interrupt();
286	<	awaitTermination(t);
287	<	releaseWriteLock(lock, s);
283	>	Action[] interruptibleLockActions = {
284	>	() -> lock.writeLockInterruptibly(),
285	>	() -> lock.tryWriteLock(Long.MIN_VALUE, DAYS),
286	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
287	>	() -> lock.readLockInterruptibly(),
288	>	() -> lock.tryReadLock(Long.MIN_VALUE, DAYS),
289	>	() -> lock.tryReadLock(Long.MAX_VALUE, DAYS),
290	>	() -> lock.asWriteLock().lockInterruptibly(),
291	>	() -> lock.asWriteLock().tryLock(0L, DAYS),
292	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
293	>	() -> lock.asReadLock().lockInterruptibly(),
294	>	() -> lock.asReadLock().tryLock(0L, DAYS),
295	>	() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS),
296	>	};
297	>	shuffle(interruptibleLockActions);
298	>
299	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
300	>	{
301	>	long s = lock.writeLock();
302	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
303	>	lock.unlockWrite(s);
304	>	}
305	>	{
306	>	long s = lock.readLock();
307	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
308	>	lock.unlockRead(s);
309	>	}
310	>	}
311	>
312	>	void assertThrowInterruptedExceptionWhenInterrupted(Action[] actions) {
313	>	int n = actions.length;
314	>	Future<?>[] futures = new Future<?>[n];
315	>	CountDownLatch threadsStarted = new CountDownLatch(n);
316	>	CountDownLatch done = new CountDownLatch(n);
317	>
318	>	for (int i = 0; i < n; i++) {
319	>	Action action = actions[i];
320	>	futures[i] = cachedThreadPool.submit(new CheckedRunnable() {
321	>	public void realRun() throws Throwable {
322	>	threadsStarted.countDown();
323	>	try {
324	>	action.run();
325	>	shouldThrow();
326	>	}
327	>	catch (InterruptedException success) {}
328	>	catch (Throwable fail) { threadUnexpectedException(fail); }
329	>	assertFalse(Thread.interrupted());
330	>	done.countDown();
331	>	}});
332	>	}
333	>
334	>	await(threadsStarted);
335	>	assertEquals(n, done.getCount());
336	>	for (Future<?> future : futures) // Interrupt all the tasks
337	>	future.cancel(true);
338	>	await(done);
339		}
340
341		/**
342	<	* timed tryWriteLock is interruptible
342	>	* interruptible operations throw InterruptedException when write locked and interrupted
343		*/
344	<	public void testWriteTryLock_Interruptible() throws InterruptedException {
300	<	final CountDownLatch running = new CountDownLatch(1);
344	>	public void testInterruptibleOperationsThrowInterruptedExceptionWriteLockedInterrupted() {
345		final StampedLock lock = new StampedLock();
346		long s = lock.writeLock();
303	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
304	–	public void realRun() throws InterruptedException {
305	–	running.countDown();
306	–	lock.tryWriteLock(2 * LONG_DELAY_MS, MILLISECONDS);
307	–	}});
347
348	<	running.await();
349	<	waitForThreadToEnterWaitState(t, 100);
350	<	t.interrupt();
351	<	awaitTermination(t);
352	<	releaseWriteLock(lock, s);
348	>	Action[] interruptibleLockBlockingActions = {
349	>	() -> lock.writeLockInterruptibly(),
350	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
351	>	() -> lock.readLockInterruptibly(),
352	>	() -> lock.tryReadLock(Long.MAX_VALUE, DAYS),
353	>	() -> lock.asWriteLock().lockInterruptibly(),
354	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
355	>	() -> lock.asReadLock().lockInterruptibly(),
356	>	() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS),
357	>	};
358	>	shuffle(interruptibleLockBlockingActions);
359	>
360	>	assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions);
361		}
362
363		/**
364	<	* readLockInterruptibly is interruptible
364	>	* interruptible operations throw InterruptedException when read locked and interrupted
365		*/
366	<	public void testReadLockInterruptibly_Interruptible()
320	<	throws InterruptedException {
321	<	final CountDownLatch running = new CountDownLatch(1);
366	>	public void testInterruptibleOperationsThrowInterruptedExceptionReadLockedInterrupted() {
367		final StampedLock lock = new StampedLock();
368	<	long s = lock.writeLock();
324	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
325	<	public void realRun() throws InterruptedException {
326	<	running.countDown();
327	<	lock.readLockInterruptibly();
328	<	}});
368	>	long s = lock.readLock();
369
370	<	running.await();
371	<	waitForThreadToEnterWaitState(t, 100);
372	<	t.interrupt();
373	<	awaitTermination(t);
374	<	releaseWriteLock(lock, s);
370	>	Action[] interruptibleLockBlockingActions = {
371	>	() -> lock.writeLockInterruptibly(),
372	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
373	>	() -> lock.asWriteLock().lockInterruptibly(),
374	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
375	>	};
376	>	shuffle(interruptibleLockBlockingActions);
377	>
378	>	assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions);
379		}
380
381		/**
382	<	* timed tryReadLock is interruptible
382	>	* Non-interruptible operations ignore and preserve interrupt status
383		*/
384	<	public void testReadTryLock_Interruptible() throws InterruptedException {
341	<	final CountDownLatch running = new CountDownLatch(1);
384	>	public void testNonInterruptibleOperationsIgnoreInterrupts() {
385		final StampedLock lock = new StampedLock();
386	<	long s = lock.writeLock();
344	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
345	<	public void realRun() throws InterruptedException {
346	<	running.countDown();
347	<	lock.tryReadLock(2 * LONG_DELAY_MS, MILLISECONDS);
348	<	}});
386	>	Thread.currentThread().interrupt();
387
388	<	running.await();
389	<	waitForThreadToEnterWaitState(t, 100);
390	<	t.interrupt();
391	<	awaitTermination(t);
392	<	releaseWriteLock(lock, s);
388	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
389	>	long s = assertValid(lock, lock.readLock());
390	>	readUnlocker.accept(lock, s);
391	>	s = assertValid(lock, lock.tryReadLock());
392	>	readUnlocker.accept(lock, s);
393	>	}
394	>
395	>	lock.asReadLock().lock();
396	>	lock.asReadLock().unlock();
397	>
398	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
399	>	long s = assertValid(lock, lock.writeLock());
400	>	writeUnlocker.accept(lock, s);
401	>	s = assertValid(lock, lock.tryWriteLock());
402	>	writeUnlocker.accept(lock, s);
403	>	}
404	>
405	>	lock.asWriteLock().lock();
406	>	lock.asWriteLock().unlock();
407	>
408	>	assertTrue(Thread.interrupted());
409		}
410
411		/**
412		* tryWriteLock on an unlocked lock succeeds
413		*/
414	<	public void testWriteTryLock() {
414	>	public void testTryWriteLock() {
415		final StampedLock lock = new StampedLock();
416		long s = lock.tryWriteLock();
417		assertTrue(s != 0L);
418		assertTrue(lock.isWriteLocked());
419	<	long s2 = lock.tryWriteLock();
366	<	assertEquals(s2, 0L);
419	>	assertEquals(0L, lock.tryWriteLock());
420		releaseWriteLock(lock, s);
421		}
422
423		/**
424		* tryWriteLock fails if locked
425		*/
426	<	public void testWriteTryLockWhenLocked() {
426	>	public void testTryWriteLockWhenLocked() {
427		final StampedLock lock = new StampedLock();
428		long s = lock.writeLock();
429		Thread t = newStartedThread(new CheckedRunnable() {
430		public void realRun() {
431	<	long ws = lock.tryWriteLock();
379	<	assertTrue(ws == 0L);
431	>	assertEquals(0L, lock.tryWriteLock());
432		}});
433
434	+	assertEquals(0L, lock.tryWriteLock());
435		awaitTermination(t);
436		releaseWriteLock(lock, s);
437		}
#	Line 386 | Line 439 | public class StampedLockTest extends JSR
439		/**
440		* tryReadLock fails if write-locked
441		*/
442	<	public void testReadTryLockWhenLocked() {
442	>	public void testTryReadLockWhenLocked() {
443		final StampedLock lock = new StampedLock();
444		long s = lock.writeLock();
445		Thread t = newStartedThread(new CheckedRunnable() {
446		public void realRun() {
447	<	long rs = lock.tryReadLock();
395	<	assertEquals(rs, 0L);
447	>	assertEquals(0L, lock.tryReadLock());
448		}});
449
450	+	assertEquals(0L, lock.tryReadLock());
451		awaitTermination(t);
452		releaseWriteLock(lock, s);
453		}
#	Line 408 | Line 461 | public class StampedLockTest extends JSR
461		Thread t = newStartedThread(new CheckedRunnable() {
462		public void realRun() throws InterruptedException {
463		long s2 = lock.tryReadLock();
464	<	assertTrue(s2 != 0L);
464	>	assertValid(lock, s2);
465		lock.unlockRead(s2);
466		long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS);
467	<	assertTrue(s3 != 0L);
467	>	assertValid(lock, s3);
468		lock.unlockRead(s3);
469		long s4 = lock.readLock();
470	+	assertValid(lock, s4);
471		lock.unlockRead(s4);
472	+	lock.asReadLock().lock();
473	+	lock.asReadLock().unlock();
474	+	lock.asReadLock().lockInterruptibly();
475	+	lock.asReadLock().unlock();
476	+	lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS);
477	+	lock.asReadLock().unlock();
478		}});
479
480		awaitTermination(t);
#	Line 422 | Line 482 | public class StampedLockTest extends JSR
482		}
483
484		/**
485	<	* A writelock succeeds only after a reading thread unlocks
485	>	* writeLock() succeeds only after a reading thread unlocks
486		*/
487		public void testWriteAfterReadLock() throws InterruptedException {
488	<	final CountDownLatch running = new CountDownLatch(1);
488	>	final CountDownLatch aboutToLock = new CountDownLatch(1);
489		final StampedLock lock = new StampedLock();
490		long rs = lock.readLock();
491		Thread t = newStartedThread(new CheckedRunnable() {
492		public void realRun() {
493	<	running.countDown();
493	>	aboutToLock.countDown();
494		long s = lock.writeLock();
495	+	assertTrue(lock.isWriteLocked());
496	+	assertFalse(lock.isReadLocked());
497		lock.unlockWrite(s);
498		}});
499
500	<	running.await();
501	<	waitForThreadToEnterWaitState(t, 100);
500	>	await(aboutToLock);
501	>	assertThreadBlocks(t, Thread.State.WAITING);
502		assertFalse(lock.isWriteLocked());
503	+	assertTrue(lock.isReadLocked());
504		lock.unlockRead(rs);
505		awaitTermination(t);
506	<	assertFalse(lock.isWriteLocked());
506	>	assertUnlocked(lock);
507		}
508
509		/**
510	<	* A writelock succeeds only after reading threads unlock
510	>	* writeLock() succeeds only after reading threads unlock
511		*/
512		public void testWriteAfterMultipleReadLocks() {
513		final StampedLock lock = new StampedLock();
#	Line 463 | Line 526 | public class StampedLockTest extends JSR
526		lock.unlockWrite(ws);
527		}});
528
529	+	assertTrue(lock.isReadLocked());
530		assertFalse(lock.isWriteLocked());
531		lock.unlockRead(s);
532		awaitTermination(t2);
533	<	assertFalse(lock.isWriteLocked());
533	>	assertUnlocked(lock);
534		}
535
536		/**
537	<	* Readlocks succeed only after a writing thread unlocks
537	>	* readLock() succeed only after a writing thread unlocks
538		*/
539		public void testReadAfterWriteLock() {
540		final StampedLock lock = new StampedLock();
541	+	final CountDownLatch threadsStarted = new CountDownLatch(2);
542		final long s = lock.writeLock();
543	<	Thread t1 = newStartedThread(new CheckedRunnable() {
479	<	public void realRun() {
480	<	long rs = lock.readLock();
481	<	lock.unlockRead(rs);
482	<	}});
483	<	Thread t2 = newStartedThread(new CheckedRunnable() {
543	>	final Runnable acquireReleaseReadLock = new CheckedRunnable() {
544		public void realRun() {
545	+	threadsStarted.countDown();
546		long rs = lock.readLock();
547	+	assertTrue(lock.isReadLocked());
548	+	assertFalse(lock.isWriteLocked());
549		lock.unlockRead(rs);
550	<	}});
551	<
550	>	}};
551	>	Thread t1 = newStartedThread(acquireReleaseReadLock);
552	>	Thread t2 = newStartedThread(acquireReleaseReadLock);
553	>
554	>	await(threadsStarted);
555	>	assertThreadBlocks(t1, Thread.State.WAITING);
556	>	assertThreadBlocks(t2, Thread.State.WAITING);
557	>	assertTrue(lock.isWriteLocked());
558	>	assertFalse(lock.isReadLocked());
559		releaseWriteLock(lock, s);
560		awaitTermination(t1);
561		awaitTermination(t2);
562	+	assertUnlocked(lock);
563		}
564
565		/**
566	<	* tryReadLock succeeds if readlocked but not writelocked
566	>	* tryReadLock succeeds if read locked but not write locked
567		*/
568		public void testTryLockWhenReadLocked() {
569		final StampedLock lock = new StampedLock();
#	Line 500 | Line 571 | public class StampedLockTest extends JSR
571		Thread t = newStartedThread(new CheckedRunnable() {
572		public void realRun() {
573		long rs = lock.tryReadLock();
574	<	threadAssertTrue(rs != 0L);
574	>	assertValid(lock, rs);
575		lock.unlockRead(rs);
576		}});
577
#	Line 509 | Line 580 | public class StampedLockTest extends JSR
580		}
581
582		/**
583	<	* tryWriteLock fails when readlocked
583	>	* tryWriteLock fails when read locked
584		*/
585	<	public void testWriteTryLockWhenReadLocked() {
585	>	public void testTryWriteLockWhenReadLocked() {
586		final StampedLock lock = new StampedLock();
587		long s = lock.readLock();
588		Thread t = newStartedThread(new CheckedRunnable() {
589		public void realRun() {
590	<	long ws = lock.tryWriteLock();
520	<	threadAssertEquals(ws, 0L);
590	>	assertEquals(0L, lock.tryWriteLock());
591		}});
592
593		awaitTermination(t);
#	Line 525 | Line 595 | public class StampedLockTest extends JSR
595		}
596
597		/**
598	<	* timed tryWriteLock times out if locked
598	>	* timed lock operations time out if lock not available
599		*/
600	<	public void testWriteTryLock_Timeout() {
600	>	public void testTimedLock_Timeout() throws Exception {
601	>	ArrayList<Future<?>> futures = new ArrayList<>();
602	>
603	>	// Write locked
604		final StampedLock lock = new StampedLock();
605	<	long s = lock.writeLock();
606	<	Thread t = newStartedThread(new CheckedRunnable() {
605	>	long stamp = lock.writeLock();
606	>	assertEquals(0L, lock.tryReadLock(0L, DAYS));
607	>	assertEquals(0L, lock.tryReadLock(Long.MIN_VALUE, DAYS));
608	>	assertFalse(lock.asReadLock().tryLock(0L, DAYS));
609	>	assertFalse(lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS));
610	>	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
611	>	assertEquals(0L, lock.tryWriteLock(Long.MIN_VALUE, DAYS));
612	>	assertFalse(lock.asWriteLock().tryLock(0L, DAYS));
613	>	assertFalse(lock.asWriteLock().tryLock(Long.MIN_VALUE, DAYS));
614	>
615	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
616		public void realRun() throws InterruptedException {
617		long startTime = System.nanoTime();
618	<	long timeoutMillis = 10;
619	<	long ws = lock.tryWriteLock(timeoutMillis, MILLISECONDS);
620	<	assertEquals(ws, 0L);
539	<	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
540	<	}});
618	>	assertEquals(0L, lock.tryWriteLock(timeoutMillis(), MILLISECONDS));
619	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
620	>	}}));
621
622	<	awaitTermination(t);
623	<	releaseWriteLock(lock, s);
624	<	}
622	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
623	>	public void realRun() throws InterruptedException {
624	>	long startTime = System.nanoTime();
625	>	assertEquals(0L, lock.tryReadLock(timeoutMillis(), MILLISECONDS));
626	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
627	>	}}));
628	>
629	>	// Read locked
630	>	final StampedLock lock2 = new StampedLock();
631	>	long stamp2 = lock2.readLock();
632	>	assertEquals(0L, lock2.tryWriteLock(0L, DAYS));
633	>	assertEquals(0L, lock2.tryWriteLock(Long.MIN_VALUE, DAYS));
634	>	assertFalse(lock2.asWriteLock().tryLock(0L, DAYS));
635	>	assertFalse(lock2.asWriteLock().tryLock(Long.MIN_VALUE, DAYS));
636
637	<	/**
547	<	* timed tryReadLock times out if write-locked
548	<	*/
549	<	public void testReadTryLock_Timeout() {
550	<	final StampedLock lock = new StampedLock();
551	<	long s = lock.writeLock();
552	<	Thread t = newStartedThread(new CheckedRunnable() {
637	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
638		public void realRun() throws InterruptedException {
639		long startTime = System.nanoTime();
640	<	long timeoutMillis = 10;
641	<	long rs = lock.tryReadLock(timeoutMillis, MILLISECONDS);
642	<	assertEquals(rs, 0L);
558	<	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
559	<	}});
640	>	assertEquals(0L, lock2.tryWriteLock(timeoutMillis(), MILLISECONDS));
641	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
642	>	}}));
643
644	<	awaitTermination(t);
645	<	assertTrue(lock.isWriteLocked());
646	<	lock.unlockWrite(s);
644	>	for (Future<?> future : futures)
645	>	assertNull(future.get());
646	>
647	>	releaseWriteLock(lock, stamp);
648	>	releaseReadLock(lock2, stamp2);
649		}
650
651		/**
652	<	* writeLockInterruptibly succeeds if unlocked, else is interruptible
652	>	* writeLockInterruptibly succeeds if unlocked
653		*/
654		public void testWriteLockInterruptibly() throws InterruptedException {
570	–	final CountDownLatch running = new CountDownLatch(1);
655		final StampedLock lock = new StampedLock();
656		long s = lock.writeLockInterruptibly();
573	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
574	–	public void realRun() throws InterruptedException {
575	–	running.countDown();
576	–	lock.writeLockInterruptibly();
577	–	}});
578	–
579	–	running.await();
580	–	waitForThreadToEnterWaitState(t, 100);
581	–	t.interrupt();
657		assertTrue(lock.isWriteLocked());
583	–	awaitTermination(t);
658		releaseWriteLock(lock, s);
659		}
660
661		/**
662	<	* readLockInterruptibly succeeds if lock free else is interruptible
662	>	* readLockInterruptibly succeeds if lock free
663		*/
664		public void testReadLockInterruptibly() throws InterruptedException {
591	–	final CountDownLatch running = new CountDownLatch(1);
665		final StampedLock lock = new StampedLock();
666	<	long s;
667	<	s = lock.readLockInterruptibly();
666	>
667	>	long s = assertValid(lock, lock.readLockInterruptibly());
668	>	assertTrue(lock.isReadLocked());
669		lock.unlockRead(s);
596	–	s = lock.writeLockInterruptibly();
597	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
598	–	public void realRun() throws InterruptedException {
599	–	running.countDown();
600	–	lock.readLockInterruptibly();
601	–	}});
670
671	<	running.await();
672	<	waitForThreadToEnterWaitState(t, 100);
673	<	t.interrupt();
606	<	awaitTermination(t);
607	<	releaseWriteLock(lock, s);
671	>	lock.asReadLock().lockInterruptibly();
672	>	assertTrue(lock.isReadLocked());
673	>	lock.asReadLock().unlock();
674		}
675
676		/**
#	Line 636 | Line 702 | public class StampedLockTest extends JSR
702		}
703
704		/**
705	<	* tryOptimisticRead succeeds and validates if unlocked, fails if locked
705	>	* tryOptimisticRead succeeds and validates if unlocked, fails if
706	>	* exclusively locked
707		*/
708		public void testValidateOptimistic() throws InterruptedException {
709		StampedLock lock = new StampedLock();
710	<	long s, p;
711	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
712	<	assertTrue(lock.validate(p));
713	<	assertTrue((s = lock.writeLock()) != 0L);
714	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
715	<	assertTrue(lock.validate(s));
716	<	lock.unlockWrite(s);
717	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
718	<	assertTrue(lock.validate(p));
719	<	assertTrue((s = lock.readLock()) != 0L);
720	<	assertTrue(lock.validate(s));
721	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
722	<	assertTrue(lock.validate(p));
723	<	lock.unlockRead(s);
724	<	assertTrue((s = lock.tryWriteLock()) != 0L);
725	<	assertTrue(lock.validate(s));
726	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
660	<	lock.unlockWrite(s);
661	<	assertTrue((s = lock.tryReadLock()) != 0L);
662	<	assertTrue(lock.validate(s));
663	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
664	<	lock.unlockRead(s);
665	<	assertTrue(lock.validate(p));
666	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
667	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
668	<	assertTrue(lock.validate(s));
669	<	lock.unlockWrite(s);
670	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
671	<	assertTrue(lock.validate(s));
672	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
673	<	lock.unlockRead(s);
674	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
710	>
711	>	assertValid(lock, lock.tryOptimisticRead());
712	>
713	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
714	>	long s = assertValid(lock, writeLocker.apply(lock));
715	>	assertEquals(0L, lock.tryOptimisticRead());
716	>	releaseWriteLock(lock, s);
717	>	}
718	>
719	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
720	>	long s = assertValid(lock, readLocker.apply(lock));
721	>	long p = assertValid(lock, lock.tryOptimisticRead());
722	>	releaseReadLock(lock, s);
723	>	assertTrue(lock.validate(p));
724	>	}
725	>
726	>	assertValid(lock, lock.tryOptimisticRead());
727		}
728
729		/**
730		* tryOptimisticRead stamp does not validate if a write lock intervenes
731		*/
732		public void testValidateOptimisticWriteLocked() {
733	<	StampedLock lock = new StampedLock();
734	<	long s, p;
735	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
684	<	assertTrue((s = lock.writeLock()) != 0L);
733	>	final StampedLock lock = new StampedLock();
734	>	final long p = assertValid(lock, lock.tryOptimisticRead());
735	>	final long s = assertValid(lock, lock.writeLock());
736		assertFalse(lock.validate(p));
737	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
737	>	assertEquals(0L, lock.tryOptimisticRead());
738		assertTrue(lock.validate(s));
739		lock.unlockWrite(s);
740		}
#	Line 694 | Line 745 | public class StampedLockTest extends JSR
745		*/
746		public void testValidateOptimisticWriteLocked2()
747		throws InterruptedException {
748	<	final CountDownLatch running = new CountDownLatch(1);
748	>	final CountDownLatch locked = new CountDownLatch(1);
749		final StampedLock lock = new StampedLock();
750	<	long s, p;
751	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
750	>	final long p = assertValid(lock, lock.tryOptimisticRead());
751	>
752		Thread t = newStartedThread(new CheckedInterruptedRunnable() {
753		public void realRun() throws InterruptedException {
754		lock.writeLockInterruptibly();
755	<	running.countDown();
755	>	locked.countDown();
756		lock.writeLockInterruptibly();
757		}});
758
759	<	running.await();
759	>	await(locked);
760		assertFalse(lock.validate(p));
761	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
761	>	assertEquals(0L, lock.tryOptimisticRead());
762	>	assertThreadBlocks(t, Thread.State.WAITING);
763		t.interrupt();
764		awaitTermination(t);
765	+	assertTrue(lock.isWriteLocked());
766		}
767
768		/**
769	<	* tryConvertToOptimisticRead succeeds and validates if successfully locked,
769	>	* tryConvertToOptimisticRead succeeds and validates if successfully locked
770		*/
771		public void testTryConvertToOptimisticRead() throws InterruptedException {
772		StampedLock lock = new StampedLock();
773	<	long s, p;
774	<	s = 0L;
775	<	assertFalse((p = lock.tryConvertToOptimisticRead(s)) != 0L);
776	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
777	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
725	<	assertTrue((s = lock.writeLock()) != 0L);
726	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
727	<	assertTrue(lock.validate(p));
728	<	assertTrue((s = lock.readLock()) != 0L);
729	<	assertTrue(lock.validate(s));
730	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
731	<	assertTrue(lock.validate(p));
732	<	assertTrue((s = lock.tryWriteLock()) != 0L);
733	<	assertTrue(lock.validate(s));
734	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
735	<	assertTrue(lock.validate(p));
736	<	assertTrue((s = lock.tryReadLock()) != 0L);
737	<	assertTrue(lock.validate(s));
738	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
739	<	assertTrue(lock.validate(p));
740	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
741	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
742	<	assertTrue(lock.validate(p));
743	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
773	>	long s, p, q;
774	>	assertEquals(0L, lock.tryConvertToOptimisticRead(0L));
775	>
776	>	s = assertValid(lock, lock.tryOptimisticRead());
777	>	assertEquals(s, lock.tryConvertToOptimisticRead(s));
778		assertTrue(lock.validate(s));
779	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
780	<	assertTrue(lock.validate(p));
779	>
780	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
781	>	s = assertValid(lock, writeLocker.apply(lock));
782	>	p = assertValid(lock, lock.tryConvertToOptimisticRead(s));
783	>	assertFalse(lock.validate(s));
784	>	assertTrue(lock.validate(p));
785	>	assertUnlocked(lock);
786	>	}
787	>
788	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
789	>	s = assertValid(lock, readLocker.apply(lock));
790	>	q = assertValid(lock, lock.tryOptimisticRead());
791	>	assertEquals(q, lock.tryConvertToOptimisticRead(q));
792	>	assertTrue(lock.validate(q));
793	>	assertTrue(lock.isReadLocked());
794	>	p = assertValid(lock, lock.tryConvertToOptimisticRead(s));
795	>	assertTrue(lock.validate(p));
796	>	assertTrue(lock.validate(s));
797	>	assertUnlocked(lock);
798	>	assertEquals(q, lock.tryConvertToOptimisticRead(q));
799	>	assertTrue(lock.validate(q));
800	>	}
801		}
802
803		/**
804	<	* tryConvertToReadLock succeeds and validates if successfully locked
751	<	* or lock free;
804	>	* tryConvertToReadLock succeeds for valid stamps
805		*/
806		public void testTryConvertToReadLock() throws InterruptedException {
807		StampedLock lock = new StampedLock();
808		long s, p;
809	<	s = 0L;
810	<	assertFalse((p = lock.tryConvertToReadLock(s)) != 0L);
811	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
812	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
813	<	lock.unlockRead(p);
814	<	assertTrue((s = lock.writeLock()) != 0L);
815	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
763	<	assertTrue(lock.validate(p));
764	<	lock.unlockRead(p);
765	<	assertTrue((s = lock.readLock()) != 0L);
766	<	assertTrue(lock.validate(s));
767	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
768	<	assertTrue(lock.validate(p));
769	<	lock.unlockRead(p);
770	<	assertTrue((s = lock.tryWriteLock()) != 0L);
771	<	assertTrue(lock.validate(s));
772	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
773	<	assertTrue(lock.validate(p));
774	<	lock.unlockRead(p);
775	<	assertTrue((s = lock.tryReadLock()) != 0L);
809	>
810	>	assertEquals(0L, lock.tryConvertToReadLock(0L));
811	>
812	>	s = assertValid(lock, lock.tryOptimisticRead());
813	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
814	>	assertTrue(lock.isReadLocked());
815	>	assertEquals(1, lock.getReadLockCount());
816		assertTrue(lock.validate(s));
777	–	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
778	–	assertTrue(lock.validate(p));
817		lock.unlockRead(p);
818	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
819	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
820	<	assertTrue(lock.validate(p));
818	>
819	>	s = assertValid(lock, lock.tryOptimisticRead());
820	>	lock.readLock();
821	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
822	>	assertTrue(lock.isReadLocked());
823	>	assertEquals(2, lock.getReadLockCount());
824		lock.unlockRead(p);
784	–	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
785	–	assertTrue(lock.validate(s));
786	–	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
787	–	assertTrue(lock.validate(p));
825		lock.unlockRead(p);
826	+	assertUnlocked(lock);
827	+
828	+	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
829	+	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
830	+	s = assertValid(lock, writeLocker.apply(lock));
831	+	p = assertValid(lock, lock.tryConvertToReadLock(s));
832	+	assertFalse(lock.validate(s));
833	+	assertTrue(lock.isReadLocked());
834	+	assertEquals(1, lock.getReadLockCount());
835	+	readUnlocker.accept(lock, p);
836	+	}
837	+
838	+	for (Function<StampedLock, Long> readLocker : readLockers()) {
839	+	s = assertValid(lock, readLocker.apply(lock));
840	+	assertEquals(s, lock.tryConvertToReadLock(s));
841	+	assertTrue(lock.validate(s));
842	+	assertTrue(lock.isReadLocked());
843	+	assertEquals(1, lock.getReadLockCount());
844	+	readUnlocker.accept(lock, s);
845	+	}
846	+	}
847		}
848
849		/**
850	<	* tryConvertToWriteLock succeeds and validates if successfully locked
793	<	* or lock free;
850	>	* tryConvertToWriteLock succeeds if lock available; fails if multiply read locked
851		*/
852		public void testTryConvertToWriteLock() throws InterruptedException {
853		StampedLock lock = new StampedLock();
854		long s, p;
855	<	s = 0L;
856	<	assertFalse((p = lock.tryConvertToWriteLock(s)) != 0L);
855	>
856	>	assertEquals(0L, lock.tryConvertToWriteLock(0L));
857	>
858		assertTrue((s = lock.tryOptimisticRead()) != 0L);
859		assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
860	+	assertTrue(lock.isWriteLocked());
861		lock.unlockWrite(p);
862	<	assertTrue((s = lock.writeLock()) != 0L);
863	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
864	<	assertTrue(lock.validate(p));
865	<	lock.unlockWrite(p);
866	<	assertTrue((s = lock.readLock()) != 0L);
867	<	assertTrue(lock.validate(s));
868	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
869	<	assertTrue(lock.validate(p));
870	<	lock.unlockWrite(p);
871	<	assertTrue((s = lock.tryWriteLock()) != 0L);
872	<	assertTrue(lock.validate(s));
873	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
874	<	assertTrue(lock.validate(p));
875	<	lock.unlockWrite(p);
876	<	assertTrue((s = lock.tryReadLock()) != 0L);
877	<	assertTrue(lock.validate(s));
878	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
879	<	assertTrue(lock.validate(p));
880	<	lock.unlockWrite(p);
881	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
882	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
883	<	assertTrue(lock.validate(p));
884	<	lock.unlockWrite(p);
885	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
886	<	assertTrue(lock.validate(s));
887	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
888	<	assertTrue(lock.validate(p));
889	<	lock.unlockWrite(p);
862	>
863	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
864	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
865	>	s = assertValid(lock, writeLocker.apply(lock));
866	>	assertEquals(s, lock.tryConvertToWriteLock(s));
867	>	assertTrue(lock.validate(s));
868	>	assertTrue(lock.isWriteLocked());
869	>	writeUnlocker.accept(lock, s);
870	>	}
871	>
872	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
873	>	s = assertValid(lock, readLocker.apply(lock));
874	>	p = assertValid(lock, lock.tryConvertToWriteLock(s));
875	>	assertFalse(lock.validate(s));
876	>	assertTrue(lock.validate(p));
877	>	assertTrue(lock.isWriteLocked());
878	>	writeUnlocker.accept(lock, p);
879	>	}
880	>	}
881	>
882	>	// failure if multiply read locked
883	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
884	>	s = assertValid(lock, readLocker.apply(lock));
885	>	p = assertValid(lock, readLocker.apply(lock));
886	>	assertEquals(0L, lock.tryConvertToWriteLock(s));
887	>	assertTrue(lock.validate(s));
888	>	assertTrue(lock.validate(p));
889	>	assertEquals(2, lock.getReadLockCount());
890	>	lock.unlock(p);
891	>	lock.unlock(s);
892	>	assertUnlocked(lock);
893	>	}
894		}
895
896		/**
897		* asWriteLock can be locked and unlocked
898		*/
899	<	public void testAsWriteLock() {
899	>	public void testAsWriteLock() throws Throwable {
900		StampedLock sl = new StampedLock();
901		Lock lock = sl.asWriteLock();
902	<	lock.lock();
903	<	assertFalse(lock.tryLock());
904	<	lock.unlock();
905	<	assertTrue(lock.tryLock());
902	>	for (Action locker : lockLockers(lock)) {
903	>	locker.run();
904	>	assertTrue(sl.isWriteLocked());
905	>	assertFalse(sl.isReadLocked());
906	>	assertFalse(lock.tryLock());
907	>	lock.unlock();
908	>	assertUnlocked(sl);
909	>	}
910		}
911
912		/**
913		* asReadLock can be locked and unlocked
914		*/
915	<	public void testAsReadLock() {
915	>	public void testAsReadLock() throws Throwable {
916		StampedLock sl = new StampedLock();
917		Lock lock = sl.asReadLock();
918	<	lock.lock();
919	<	lock.unlock();
920	<	assertTrue(lock.tryLock());
918	>	for (Action locker : lockLockers(lock)) {
919	>	locker.run();
920	>	assertTrue(sl.isReadLocked());
921	>	assertFalse(sl.isWriteLocked());
922	>	assertEquals(1, sl.getReadLockCount());
923	>	locker.run();
924	>	assertTrue(sl.isReadLocked());
925	>	assertEquals(2, sl.getReadLockCount());
926	>	lock.unlock();
927	>	lock.unlock();
928	>	assertUnlocked(sl);
929	>	}
930		}
931
932		/**
933		* asReadWriteLock.writeLock can be locked and unlocked
934		*/
935	<	public void testAsReadWriteLockWriteLock() {
935	>	public void testAsReadWriteLockWriteLock() throws Throwable {
936		StampedLock sl = new StampedLock();
937		Lock lock = sl.asReadWriteLock().writeLock();
938	<	lock.lock();
939	<	assertFalse(lock.tryLock());
940	<	lock.unlock();
941	<	assertTrue(lock.tryLock());
938	>	for (Action locker : lockLockers(lock)) {
939	>	locker.run();
940	>	assertTrue(sl.isWriteLocked());
941	>	assertFalse(sl.isReadLocked());
942	>	assertFalse(lock.tryLock());
943	>	lock.unlock();
944	>	assertUnlocked(sl);
945	>	}
946		}
947
948		/**
949		* asReadWriteLock.readLock can be locked and unlocked
950		*/
951	<	public void testAsReadWriteLockReadLock() {
951	>	public void testAsReadWriteLockReadLock() throws Throwable {
952		StampedLock sl = new StampedLock();
953		Lock lock = sl.asReadWriteLock().readLock();
954	<	lock.lock();
955	<	lock.unlock();
956	<	assertTrue(lock.tryLock());
954	>	for (Action locker : lockLockers(lock)) {
955	>	locker.run();
956	>	assertTrue(sl.isReadLocked());
957	>	assertFalse(sl.isWriteLocked());
958	>	assertEquals(1, sl.getReadLockCount());
959	>	locker.run();
960	>	assertTrue(sl.isReadLocked());
961	>	assertEquals(2, sl.getReadLockCount());
962	>	lock.unlock();
963	>	lock.unlock();
964	>	assertUnlocked(sl);
965	>	}
966		}
967
968		/**
#	Line 896 | Line 985 | public class StampedLockTest extends JSR
985		Runnable[] actions = {
986		() -> {
987		StampedLock sl = new StampedLock();
988	<	long stamp = sl.tryOptimisticRead();
900	<	assertTrue(stamp != 0);
988	>	long stamp = assertValid(sl, sl.tryOptimisticRead());
989		sl.unlockRead(stamp);
990		},
991		() -> {
#	Line 914 | Line 1002 | public class StampedLockTest extends JSR
1002		},
1003		() -> {
1004		StampedLock sl = new StampedLock();
917	–	long stamp = sl.tryOptimisticRead();
1005		sl.readLock();
1006	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
1007		sl.unlockRead(stamp);
1008		},
1009		() -> {
1010		StampedLock sl = new StampedLock();
923	–	long stamp = sl.tryOptimisticRead();
1011		sl.readLock();
1012	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
1013		sl.unlock(stamp);
1014		},
1015
1016		() -> {
1017		StampedLock sl = new StampedLock();
1018		long stamp = sl.tryConvertToOptimisticRead(sl.writeLock());
1019	<	assertTrue(stamp != 0);
1019	>	assertValid(sl, stamp);
1020		sl.writeLock();
1021		sl.unlockWrite(stamp);
1022		},
#	Line 954 | Line 1042 | public class StampedLockTest extends JSR
1042		() -> {
1043		StampedLock sl = new StampedLock();
1044		long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1045	<	assertTrue(stamp != 0);
1045	>	assertValid(sl, stamp);
1046		sl.writeLock();
1047		sl.unlockWrite(stamp);
1048		},
#	Line 974 | Line 1062 | public class StampedLockTest extends JSR
1062		StampedLock sl = new StampedLock();
1063		sl.readLock();
1064		long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1065	<	assertTrue(stamp != 0);
1065	>	assertValid(sl, stamp);
1066		sl.readLock();
1067		sl.unlockRead(stamp);
1068		},
#	Line 996 | Line 1084 | public class StampedLockTest extends JSR
1084		assertThrows(IllegalMonitorStateException.class, actions);
1085		}
1086
1087	+	static long writeLockInterruptiblyUninterrupted(StampedLock sl) {
1088	+	try { return sl.writeLockInterruptibly(); }
1089	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1090	+	}
1091	+
1092	+	static long tryWriteLockUninterrupted(StampedLock sl, long time, TimeUnit unit) {
1093	+	try { return sl.tryWriteLock(time, unit); }
1094	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1095	+	}
1096	+
1097	+	static long readLockInterruptiblyUninterrupted(StampedLock sl) {
1098	+	try { return sl.readLockInterruptibly(); }
1099	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1100	+	}
1101	+
1102	+	static long tryReadLockUninterrupted(StampedLock sl, long time, TimeUnit unit) {
1103	+	try { return sl.tryReadLock(time, unit); }
1104	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1105	+	}
1106	+
1107	+	/**
1108	+	* Invalid stamps result in IllegalMonitorStateException
1109	+	*/
1110	+	public void testInvalidStampsThrowIllegalMonitorStateException() {
1111	+	final StampedLock sl = new StampedLock();
1112	+
1113	+	assertThrows(IllegalMonitorStateException.class,
1114	+	() -> sl.unlockWrite(0L),
1115	+	() -> sl.unlockRead(0L),
1116	+	() -> sl.unlock(0L));
1117	+
1118	+	final long optimisticStamp = sl.tryOptimisticRead();
1119	+	final long readStamp = sl.readLock();
1120	+	sl.unlockRead(readStamp);
1121	+	final long writeStamp = sl.writeLock();
1122	+	sl.unlockWrite(writeStamp);
1123	+	assertTrue(optimisticStamp != 0L && readStamp != 0L && writeStamp != 0L);
1124	+	final long[] noLongerValidStamps = { optimisticStamp, readStamp, writeStamp };
1125	+	final Runnable assertNoLongerValidStampsThrow = () -> {
1126	+	for (long noLongerValidStamp : noLongerValidStamps)
1127	+	assertThrows(IllegalMonitorStateException.class,
1128	+	() -> sl.unlockWrite(noLongerValidStamp),
1129	+	() -> sl.unlockRead(noLongerValidStamp),
1130	+	() -> sl.unlock(noLongerValidStamp));
1131	+	};
1132	+	assertNoLongerValidStampsThrow.run();
1133	+
1134	+	for (Function<StampedLock, Long> readLocker : readLockers())
1135	+	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
1136	+	final long stamp = readLocker.apply(sl);
1137	+	assertValid(sl, stamp);
1138	+	assertNoLongerValidStampsThrow.run();
1139	+	assertThrows(IllegalMonitorStateException.class,
1140	+	() -> sl.unlockWrite(stamp),
1141	+	() -> sl.unlockRead(sl.tryOptimisticRead()),
1142	+	() -> sl.unlockRead(0L));
1143	+	readUnlocker.accept(sl, stamp);
1144	+	assertUnlocked(sl);
1145	+	assertNoLongerValidStampsThrow.run();
1146	+	}
1147	+
1148	+	for (Function<StampedLock, Long> writeLocker : writeLockers())
1149	+	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
1150	+	final long stamp = writeLocker.apply(sl);
1151	+	assertValid(sl, stamp);
1152	+	assertNoLongerValidStampsThrow.run();
1153	+	assertThrows(IllegalMonitorStateException.class,
1154	+	() -> sl.unlockRead(stamp),
1155	+	() -> sl.unlockWrite(0L));
1156	+	writeUnlocker.accept(sl, stamp);
1157	+	assertUnlocked(sl);
1158	+	assertNoLongerValidStampsThrow.run();
1159	+	}
1160	+	}
1161	+
1162	+	/**
1163	+	* Read locks can be very deeply nested
1164	+	*/
1165	+	public void testDeeplyNestedReadLocks() {
1166	+	final StampedLock lock = new StampedLock();
1167	+	final int depth = 300;
1168	+	final long[] stamps = new long[depth];
1169	+	final List<Function<StampedLock, Long>> readLockers = readLockers();
1170	+	final List<BiConsumer<StampedLock, Long>> readUnlockers = readUnlockers();
1171	+	for (int i = 0; i < depth; i++) {
1172	+	Function<StampedLock, Long> readLocker
1173	+	= readLockers.get(i % readLockers.size());
1174	+	long stamp = readLocker.apply(lock);
1175	+	assertEquals(i + 1, lock.getReadLockCount());
1176	+	assertTrue(lock.isReadLocked());
1177	+	stamps[i] = stamp;
1178	+	}
1179	+	for (int i = 0; i < depth; i++) {
1180	+	BiConsumer<StampedLock, Long> readUnlocker
1181	+	= readUnlockers.get(i % readUnlockers.size());
1182	+	assertEquals(depth - i, lock.getReadLockCount());
1183	+	assertTrue(lock.isReadLocked());
1184	+	readUnlocker.accept(lock, stamps[depth - 1 - i]);
1185	+	}
1186	+	assertUnlocked(lock);
1187	+	}
1188	+
1189	+	/**
1190	+	* Stamped locks are not reentrant.
1191	+	*/
1192	+	public void testNonReentrant() throws InterruptedException {
1193	+	final StampedLock lock = new StampedLock();
1194	+	long stamp;
1195	+
1196	+	stamp = lock.writeLock();
1197	+	assertValid(lock, stamp);
1198	+	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1199	+	assertEquals(0L, lock.tryReadLock(0L, DAYS));
1200	+	assertValid(lock, stamp);
1201	+	lock.unlockWrite(stamp);
1202	+
1203	+	stamp = lock.tryWriteLock(1L, DAYS);
1204	+	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1205	+	assertValid(lock, stamp);
1206	+	lock.unlockWrite(stamp);
1207	+
1208	+	stamp = lock.readLock();
1209	+	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1210	+	assertValid(lock, stamp);
1211	+	lock.unlockRead(stamp);
1212	+	}
1213	+
1214	+	/**
1215	+	* """StampedLocks have no notion of ownership. Locks acquired in
1216	+	* one thread can be released or converted in another."""
1217	+	*/
1218	+	public void testNoOwnership() throws Throwable {
1219	+	ArrayList<Future<?>> futures = new ArrayList<>();
1220	+	for (Function<StampedLock, Long> writeLocker : writeLockers())
1221	+	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
1222	+	StampedLock lock = new StampedLock();
1223	+	long stamp = writeLocker.apply(lock);
1224	+	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
1225	+	public void realRun() {
1226	+	writeUnlocker.accept(lock, stamp);
1227	+	assertUnlocked(lock);
1228	+	assertFalse(lock.validate(stamp));
1229	+	}}));
1230	+	}
1231	+	for (Future<?> future : futures)
1232	+	assertNull(future.get());
1233	+	}
1234	+
1235	+	/** Tries out sample usage code from StampedLock javadoc. */
1236	+	public void testSampleUsage() throws Throwable {
1237	+	class Point {
1238	+	private double x, y;
1239	+	private final StampedLock sl = new StampedLock();
1240	+
1241	+	void move(double deltaX, double deltaY) { // an exclusively locked method
1242	+	long stamp = sl.writeLock();
1243	+	try {
1244	+	x += deltaX;
1245	+	y += deltaY;
1246	+	} finally {
1247	+	sl.unlockWrite(stamp);
1248	+	}
1249	+	}
1250	+
1251	+	double distanceFromOrigin() { // A read-only method
1252	+	double currentX, currentY;
1253	+	long stamp = sl.tryOptimisticRead();
1254	+	do {
1255	+	if (stamp == 0L)
1256	+	stamp = sl.readLock();
1257	+	try {
1258	+	// possibly racy reads
1259	+	currentX = x;
1260	+	currentY = y;
1261	+	} finally {
1262	+	stamp = sl.tryConvertToOptimisticRead(stamp);
1263	+	}
1264	+	} while (stamp == 0);
1265	+	return Math.hypot(currentX, currentY);
1266	+	}
1267	+
1268	+	double distanceFromOrigin2() {
1269	+	long stamp = sl.tryOptimisticRead();
1270	+	try {
1271	+	retryHoldingLock:
1272	+	for (;; stamp = sl.readLock()) {
1273	+	if (stamp == 0L)
1274	+	continue retryHoldingLock;
1275	+	// possibly racy reads
1276	+	double currentX = x;
1277	+	double currentY = y;
1278	+	if (!sl.validate(stamp))
1279	+	continue retryHoldingLock;
1280	+	return Math.hypot(currentX, currentY);
1281	+	}
1282	+	} finally {
1283	+	if (StampedLock.isReadLockStamp(stamp))
1284	+	sl.unlockRead(stamp);
1285	+	}
1286	+	}
1287	+
1288	+	void moveIfAtOrigin(double newX, double newY) {
1289	+	long stamp = sl.readLock();
1290	+	try {
1291	+	while (x == 0.0 && y == 0.0) {
1292	+	long ws = sl.tryConvertToWriteLock(stamp);
1293	+	if (ws != 0L) {
1294	+	stamp = ws;
1295	+	x = newX;
1296	+	y = newY;
1297	+	return;
1298	+	}
1299	+	else {
1300	+	sl.unlockRead(stamp);
1301	+	stamp = sl.writeLock();
1302	+	}
1303	+	}
1304	+	} finally {
1305	+	sl.unlock(stamp);
1306	+	}
1307	+	}
1308	+	}
1309	+
1310	+	Point p = new Point();
1311	+	p.move(3.0, 4.0);
1312	+	assertEquals(5.0, p.distanceFromOrigin());
1313	+	p.moveIfAtOrigin(5.0, 12.0);
1314	+	assertEquals(5.0, p.distanceFromOrigin2());
1315	+	}
1316	+
1317	+	/**
1318	+	* Stamp inspection methods work as expected, and do not inspect
1319	+	* the state of the lock itself.
1320	+	*/
1321	+	public void testStampStateInspectionMethods() {
1322	+	StampedLock lock = new StampedLock();
1323	+
1324	+	assertFalse(isWriteLockStamp(0L));
1325	+	assertFalse(isReadLockStamp(0L));
1326	+	assertFalse(isLockStamp(0L));
1327	+	assertFalse(isOptimisticReadStamp(0L));
1328	+
1329	+	{
1330	+	long stamp = lock.writeLock();
1331	+	for (int i = 0; i < 2; i++) {
1332	+	assertTrue(isWriteLockStamp(stamp));
1333	+	assertFalse(isReadLockStamp(stamp));
1334	+	assertTrue(isLockStamp(stamp));
1335	+	assertFalse(isOptimisticReadStamp(stamp));
1336	+	if (i == 0)
1337	+	lock.unlockWrite(stamp);
1338	+	}
1339	+	}
1340	+
1341	+	{
1342	+	long stamp = lock.readLock();
1343	+	for (int i = 0; i < 2; i++) {
1344	+	assertFalse(isWriteLockStamp(stamp));
1345	+	assertTrue(isReadLockStamp(stamp));
1346	+	assertTrue(isLockStamp(stamp));
1347	+	assertFalse(isOptimisticReadStamp(stamp));
1348	+	if (i == 0)
1349	+	lock.unlockRead(stamp);
1350	+	}
1351	+	}
1352	+
1353	+	{
1354	+	long optimisticStamp = lock.tryOptimisticRead();
1355	+	long readStamp = lock.tryConvertToReadLock(optimisticStamp);
1356	+	long writeStamp = lock.tryConvertToWriteLock(readStamp);
1357	+	for (int i = 0; i < 2; i++) {
1358	+	assertFalse(isWriteLockStamp(optimisticStamp));
1359	+	assertFalse(isReadLockStamp(optimisticStamp));
1360	+	assertFalse(isLockStamp(optimisticStamp));
1361	+	assertTrue(isOptimisticReadStamp(optimisticStamp));
1362	+
1363	+	assertFalse(isWriteLockStamp(readStamp));
1364	+	assertTrue(isReadLockStamp(readStamp));
1365	+	assertTrue(isLockStamp(readStamp));
1366	+	assertFalse(isOptimisticReadStamp(readStamp));
1367	+
1368	+	assertTrue(isWriteLockStamp(writeStamp));
1369	+	assertFalse(isReadLockStamp(writeStamp));
1370	+	assertTrue(isLockStamp(writeStamp));
1371	+	assertFalse(isOptimisticReadStamp(writeStamp));
1372	+	if (i == 0)
1373	+	lock.unlockWrite(writeStamp);
1374	+	}
1375	+	}
1376	+	}
1377	+
1378		}

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