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

Comparing jsr166/src/test/tck/StampedLockTest.java (file contents):
Revision 1.21 by jsr166, Tue Jun 7 22:10:33 2016 UTC vs.
Revision 1.38 by jsr166, Thu Sep 21 17:52:52 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 java.util.ArrayList;
12	+	import java.util.List;
13		import java.util.concurrent.CountDownLatch;
14	+	import java.util.concurrent.Future;
15	+	import java.util.concurrent.TimeUnit;
16		import java.util.concurrent.locks.Lock;
17		import java.util.concurrent.locks.StampedLock;
18	+	import java.util.function.BiConsumer;
19	+	import java.util.function.Function;
20
21		import junit.framework.Test;
22		import junit.framework.TestSuite;
#	Line 23 | Line 30 | public class StampedLockTest extends JSR
30		}
31
32		/**
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	–	/**
33		* Releases write lock, checking isWriteLocked before and after
34		*/
35	<	void releaseWriteLock(StampedLock lock, long s) {
35	>	void releaseWriteLock(StampedLock lock, long stamp) {
36		assertTrue(lock.isWriteLocked());
37	<	lock.unlockWrite(s);
37	>	assertValid(lock, stamp);
38	>	lock.unlockWrite(stamp);
39		assertFalse(lock.isWriteLocked());
40	+	assertFalse(lock.validate(stamp));
41		}
42
43		/**
44	<	* Constructed StampedLock is in unlocked state
44	>	* Releases read lock, checking isReadLocked before and after
45		*/
46	<	public void testConstructor() {
47	<	StampedLock lock;
48	<	lock = new StampedLock();
49	<	assertFalse(lock.isWriteLocked());
46	>	void releaseReadLock(StampedLock lock, long stamp) {
47	>	assertTrue(lock.isReadLocked());
48	>	assertValid(lock, stamp);
49	>	lock.unlockRead(stamp);
50		assertFalse(lock.isReadLocked());
51	<	assertEquals(lock.getReadLockCount(), 0);
51	>	assertTrue(lock.validate(stamp));
52		}
53
54	<	/**
55	<	* write-locking and read-locking an unlocked lock succeed
56	<	*/
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);
54	>	long assertNonZero(long v) {
55	>	assertTrue(v != 0L);
56	>	return v;
57		}
58
59	<	/**
60	<	* unlock releases either a read or write lock
61	<	*/
62	<	public void testUnlock() {
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);
59	>	long assertValid(StampedLock lock, long stamp) {
60	>	assertTrue(stamp != 0L);
61	>	assertTrue(lock.validate(stamp));
62	>	return stamp;
63		}
64
65	<	/**
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());
65	>	void assertUnlocked(StampedLock lock) {
66		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());
67		assertFalse(lock.isWriteLocked());
68	<	assertFalse(lock.isReadLocked());
69	<	assertEquals(lock.getReadLockCount(), 0);
68	>	assertEquals(0, lock.getReadLockCount());
69	>	assertValid(lock, lock.tryOptimisticRead());
70		}
71
72	<	/**
73	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
74	<	*/
75	<	public void testWriteUnlock_IMSE() {
76	<	StampedLock lock = new StampedLock();
77	<	try {
78	<	lock.unlockWrite(0L);
79	<	shouldThrow();
80	<	} catch (IllegalMonitorStateException success) {}
72	>	List<Action> lockLockers(Lock lock) {
73	>	List<Action> lockers = new ArrayList<>();
74	>	lockers.add(() -> lock.lock());
75	>	lockers.add(() -> lock.lockInterruptibly());
76	>	lockers.add(() -> lock.tryLock());
77	>	lockers.add(() -> lock.tryLock(Long.MIN_VALUE, DAYS));
78	>	lockers.add(() -> lock.tryLock(0L, DAYS));
79	>	lockers.add(() -> lock.tryLock(Long.MAX_VALUE, DAYS));
80	>	return lockers;
81	>	}
82	>
83	>	List<Function<StampedLock, Long>> readLockers() {
84	>	List<Function<StampedLock, Long>> readLockers = new ArrayList<>();
85	>	readLockers.add(sl -> sl.readLock());
86	>	readLockers.add(sl -> sl.tryReadLock());
87	>	readLockers.add(sl -> readLockInterruptiblyUninterrupted(sl));
88	>	readLockers.add(sl -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
89	>	readLockers.add(sl -> tryReadLockUninterrupted(sl, 0L, DAYS));
90	>	readLockers.add(sl -> sl.tryConvertToReadLock(sl.tryOptimisticRead()));
91	>	return readLockers;
92	>	}
93	>
94	>	List<BiConsumer<StampedLock, Long>> readUnlockers() {
95	>	List<BiConsumer<StampedLock, Long>> readUnlockers = new ArrayList<>();
96	>	readUnlockers.add((sl, stamp) -> sl.unlockRead(stamp));
97	>	readUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockRead()));
98	>	readUnlockers.add((sl, stamp) -> sl.asReadLock().unlock());
99	>	readUnlockers.add((sl, stamp) -> sl.unlock(stamp));
100	>	readUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp)));
101	>	return readUnlockers;
102	>	}
103	>
104	>	List<Function<StampedLock, Long>> writeLockers() {
105	>	List<Function<StampedLock, Long>> writeLockers = new ArrayList<>();
106	>	writeLockers.add(sl -> sl.writeLock());
107	>	writeLockers.add(sl -> sl.tryWriteLock());
108	>	writeLockers.add(sl -> writeLockInterruptiblyUninterrupted(sl));
109	>	writeLockers.add(sl -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
110	>	writeLockers.add(sl -> tryWriteLockUninterrupted(sl, 0L, DAYS));
111	>	writeLockers.add(sl -> sl.tryConvertToWriteLock(sl.tryOptimisticRead()));
112	>	return writeLockers;
113	>	}
114	>
115	>	List<BiConsumer<StampedLock, Long>> writeUnlockers() {
116	>	List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>();
117	>	writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp));
118	>	writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite()));
119	>	writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock());
120	>	writeUnlockers.add((sl, stamp) -> sl.unlock(stamp));
121	>	writeUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp)));
122	>	return writeUnlockers;
123		}
124
125		/**
126	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
126	>	* Constructed StampedLock is in unlocked state
127		*/
128	<	public void testWriteUnlock_IMSE2() {
129	<	StampedLock lock = new StampedLock();
169	<	long s = lock.writeLock();
170	<	lock.unlockWrite(s);
171	<	try {
172	<	lock.unlockWrite(s);
173	<	shouldThrow();
174	<	} catch (IllegalMonitorStateException success) {}
128	>	public void testConstructor() {
129	>	assertUnlocked(new StampedLock());
130		}
131
132		/**
133	<	* write-unlocking after readlock throws IllegalMonitorStateException
133	>	* write-locking, then unlocking, an unlocked lock succeed
134		*/
135	<	public void testWriteUnlock_IMSE3() {
135	>	public void testWriteLock_lockUnlock() {
136		StampedLock lock = new StampedLock();
137	<	long s = lock.readLock();
138	<	try {
139	<	lock.unlockWrite(s);
140	<	shouldThrow();
141	<	} catch (IllegalMonitorStateException success) {}
137	>
138	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
139	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
140	>	assertFalse(lock.isWriteLocked());
141	>	assertFalse(lock.isReadLocked());
142	>	assertEquals(0, lock.getReadLockCount());
143	>
144	>	long s = writeLocker.apply(lock);
145	>	assertValid(lock, s);
146	>	assertTrue(lock.isWriteLocked());
147	>	assertFalse(lock.isReadLocked());
148	>	assertEquals(0, lock.getReadLockCount());
149	>	writeUnlocker.accept(lock, s);
150	>	assertUnlocked(lock);
151	>	}
152		}
153
154		/**
155	<	* read-unlocking an unlocked lock throws IllegalMonitorStateException
155	>	* read-locking, then unlocking, an unlocked lock succeed
156		*/
157	<	public void testReadUnlock_IMSE() {
157	>	public void testReadLock_lockUnlock() {
158		StampedLock lock = new StampedLock();
159	<	long s = lock.readLock();
160	<	lock.unlockRead(s);
161	<	try {
162	<	lock.unlockRead(s);
163	<	shouldThrow();
164	<	} catch (IllegalMonitorStateException success) {}
159	>
160	>	for (Function<StampedLock, Long> readLocker : readLockers())
161	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
162	>	long s = 42;
163	>	for (int i = 0; i < 2; i++) {
164	>	s = assertValid(lock, readLocker.apply(lock));
165	>	assertFalse(lock.isWriteLocked());
166	>	assertTrue(lock.isReadLocked());
167	>	assertEquals(i + 1, lock.getReadLockCount());
168	>	}
169	>	for (int i = 0; i < 2; i++) {
170	>	assertFalse(lock.isWriteLocked());
171	>	assertTrue(lock.isReadLocked());
172	>	assertEquals(2 - i, lock.getReadLockCount());
173	>	readUnlocker.accept(lock, s);
174	>	}
175	>	assertUnlocked(lock);
176	>	}
177		}
178
179		/**
180	<	* read-unlocking an unlocked lock throws IllegalMonitorStateException
180	>	* tryUnlockWrite fails if not write locked
181		*/
182	<	public void testReadUnlock_IMSE2() {
182	>	public void testTryUnlockWrite_failure() {
183		StampedLock lock = new StampedLock();
184	<	try {
185	<	lock.unlockRead(0L);
186	<	shouldThrow();
187	<	} catch (IllegalMonitorStateException success) {}
184	>	assertFalse(lock.tryUnlockWrite());
185	>
186	>	for (Function<StampedLock, Long> readLocker : readLockers())
187	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
188	>	long s = assertValid(lock, readLocker.apply(lock));
189	>	assertFalse(lock.tryUnlockWrite());
190	>	assertTrue(lock.isReadLocked());
191	>	readUnlocker.accept(lock, s);
192	>	assertUnlocked(lock);
193	>	}
194		}
195
196		/**
197	<	* read-unlocking after writeLock throws IllegalMonitorStateException
197	>	* tryUnlockRead fails if not read locked
198		*/
199	<	public void testReadUnlock_IMSE3() {
199	>	public void testTryUnlockRead_failure() {
200		StampedLock lock = new StampedLock();
201	<	long s = lock.writeLock();
202	<	try {
203	<	lock.unlockRead(s);
204	<	shouldThrow();
205	<	} catch (IllegalMonitorStateException success) {}
201	>	assertFalse(lock.tryUnlockRead());
202	>
203	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
204	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
205	>	long s = writeLocker.apply(lock);
206	>	assertFalse(lock.tryUnlockRead());
207	>	assertTrue(lock.isWriteLocked());
208	>	writeUnlocker.accept(lock, s);
209	>	assertUnlocked(lock);
210	>	}
211		}
212
213		/**
214	<	* validate(0) fails
214	>	* validate(0L) fails
215		*/
216		public void testValidate0() {
217		StampedLock lock = new StampedLock();
#	Line 231 | Line 219 | public class StampedLockTest extends JSR
219		}
220
221		/**
222	<	* A stamp obtained from a successful lock operation validates
222	>	* A stamp obtained from a successful lock operation validates while the lock is held
223		*/
224		public void testValidate() throws InterruptedException {
225		StampedLock lock = new StampedLock();
226	<	long s = lock.writeLock();
227	<	assertTrue(lock.validate(s));
228	<	lock.unlockWrite(s);
229	<	s = lock.readLock();
230	<	assertTrue(lock.validate(s));
231	<	lock.unlockRead(s);
232	<	assertTrue((s = lock.tryWriteLock()) != 0L);
233	<	assertTrue(lock.validate(s));
234	<	lock.unlockWrite(s);
235	<	assertTrue((s = lock.tryReadLock()) != 0L);
236	<	assertTrue(lock.validate(s));
237	<	lock.unlockRead(s);
238	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
239	<	assertTrue(lock.validate(s));
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);
226	>
227	>	for (Function<StampedLock, Long> readLocker : readLockers())
228	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
229	>	long s = assertNonZero(readLocker.apply(lock));
230	>	assertTrue(lock.validate(s));
231	>	readUnlocker.accept(lock, s);
232	>	}
233	>
234	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
235	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
236	>	long s = assertNonZero(writeLocker.apply(lock));
237	>	assertTrue(lock.validate(s));
238	>	writeUnlocker.accept(lock, s);
239	>	}
240		}
241
242		/**
#	Line 261 | Line 244 | public class StampedLockTest extends JSR
244		*/
245		public void testValidate2() throws InterruptedException {
246		StampedLock lock = new StampedLock();
247	<	long s;
265	<	assertTrue((s = lock.writeLock()) != 0L);
247	>	long s = assertNonZero(lock.writeLock());
248		assertTrue(lock.validate(s));
249		assertFalse(lock.validate(lock.tryWriteLock()));
250	<	assertFalse(lock.validate(lock.tryWriteLock(10L, MILLISECONDS)));
250	>	assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(),
251	>	randomTimeUnit())));
252		assertFalse(lock.validate(lock.tryReadLock()));
253	<	assertFalse(lock.validate(lock.tryReadLock(10L, MILLISECONDS)));
253	>	assertFalse(lock.validate(lock.tryWriteLock(randomExpiredTimeout(),
254	>	randomTimeUnit())));
255		assertFalse(lock.validate(lock.tryOptimisticRead()));
256		lock.unlockWrite(s);
257		}
258
259	+	void assertThrowInterruptedExceptionWhenPreInterrupted(Action[] actions) {
260	+	for (Action action : actions) {
261	+	Thread.currentThread().interrupt();
262	+	try {
263	+	action.run();
264	+	shouldThrow();
265	+	}
266	+	catch (InterruptedException success) {}
267	+	catch (Throwable fail) { threadUnexpectedException(fail); }
268	+	assertFalse(Thread.interrupted());
269	+	}
270	+	}
271	+
272		/**
273	<	* writeLockInterruptibly is interruptible
273	>	* interruptible operations throw InterruptedException when pre-interrupted
274		*/
275	<	public void testWriteLockInterruptibly_Interruptible()
279	<	throws InterruptedException {
280	<	final CountDownLatch running = new CountDownLatch(1);
275	>	public void testInterruptibleOperationsThrowInterruptedExceptionWhenPreInterrupted() {
276		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	–	}});
277
278	<	running.await();
279	<	waitForThreadToEnterWaitState(t, 100);
280	<	t.interrupt();
281	<	awaitTermination(t);
282	<	releaseWriteLock(lock, s);
278	>	Action[] interruptibleLockActions = {
279	>	() -> lock.writeLockInterruptibly(),
280	>	() -> lock.tryWriteLock(Long.MIN_VALUE, DAYS),
281	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
282	>	() -> lock.readLockInterruptibly(),
283	>	() -> lock.tryReadLock(Long.MIN_VALUE, DAYS),
284	>	() -> lock.tryReadLock(Long.MAX_VALUE, DAYS),
285	>	() -> lock.asWriteLock().lockInterruptibly(),
286	>	() -> lock.asWriteLock().tryLock(0L, DAYS),
287	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
288	>	() -> lock.asReadLock().lockInterruptibly(),
289	>	() -> lock.asReadLock().tryLock(0L, DAYS),
290	>	() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS),
291	>	};
292	>	shuffle(interruptibleLockActions);
293	>
294	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
295	>	{
296	>	long s = lock.writeLock();
297	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
298	>	lock.unlockWrite(s);
299	>	}
300	>	{
301	>	long s = lock.readLock();
302	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
303	>	lock.unlockRead(s);
304	>	}
305	>	}
306	>
307	>	void assertThrowInterruptedExceptionWhenInterrupted(Action[] actions) {
308	>	int n = actions.length;
309	>	Future<?>[] futures = new Future<?>[n];
310	>	CountDownLatch threadsStarted = new CountDownLatch(n);
311	>	CountDownLatch done = new CountDownLatch(n);
312	>
313	>	for (int i = 0; i < n; i++) {
314	>	Action action = actions[i];
315	>	futures[i] = cachedThreadPool.submit(new CheckedRunnable() {
316	>	public void realRun() throws Throwable {
317	>	threadsStarted.countDown();
318	>	try {
319	>	action.run();
320	>	shouldThrow();
321	>	}
322	>	catch (InterruptedException success) {}
323	>	catch (Throwable fail) { threadUnexpectedException(fail); }
324	>	assertFalse(Thread.interrupted());
325	>	done.countDown();
326	>	}});
327	>	}
328	>
329	>	await(threadsStarted);
330	>	assertEquals(n, done.getCount());
331	>	for (Future<?> future : futures) // Interrupt all the tasks
332	>	future.cancel(true);
333	>	await(done);
334		}
335
336		/**
337	<	* timed tryWriteLock is interruptible
337	>	* interruptible operations throw InterruptedException when write locked and interrupted
338		*/
339	<	public void testWriteTryLock_Interruptible() throws InterruptedException {
300	<	final CountDownLatch running = new CountDownLatch(1);
339	>	public void testInterruptibleOperationsThrowInterruptedExceptionWriteLockedInterrupted() {
340		final StampedLock lock = new StampedLock();
341		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	–	}});
342
343	<	running.await();
344	<	waitForThreadToEnterWaitState(t, 100);
345	<	t.interrupt();
346	<	awaitTermination(t);
347	<	releaseWriteLock(lock, s);
343	>	Action[] interruptibleLockBlockingActions = {
344	>	() -> lock.writeLockInterruptibly(),
345	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
346	>	() -> lock.readLockInterruptibly(),
347	>	() -> lock.tryReadLock(Long.MAX_VALUE, DAYS),
348	>	() -> lock.asWriteLock().lockInterruptibly(),
349	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
350	>	() -> lock.asReadLock().lockInterruptibly(),
351	>	() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS),
352	>	};
353	>	shuffle(interruptibleLockBlockingActions);
354	>
355	>	assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions);
356		}
357
358		/**
359	<	* readLockInterruptibly is interruptible
359	>	* interruptible operations throw InterruptedException when read locked and interrupted
360		*/
361	<	public void testReadLockInterruptibly_Interruptible()
320	<	throws InterruptedException {
321	<	final CountDownLatch running = new CountDownLatch(1);
361	>	public void testInterruptibleOperationsThrowInterruptedExceptionReadLockedInterrupted() {
362		final StampedLock lock = new StampedLock();
363	<	long s = lock.writeLock();
324	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
325	<	public void realRun() throws InterruptedException {
326	<	running.countDown();
327	<	lock.readLockInterruptibly();
328	<	}});
363	>	long s = lock.readLock();
364
365	<	running.await();
366	<	waitForThreadToEnterWaitState(t, 100);
367	<	t.interrupt();
368	<	awaitTermination(t);
369	<	releaseWriteLock(lock, s);
365	>	Action[] interruptibleLockBlockingActions = {
366	>	() -> lock.writeLockInterruptibly(),
367	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
368	>	() -> lock.asWriteLock().lockInterruptibly(),
369	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
370	>	};
371	>	shuffle(interruptibleLockBlockingActions);
372	>
373	>	assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions);
374		}
375
376		/**
377	<	* timed tryReadLock is interruptible
377	>	* Non-interruptible operations ignore and preserve interrupt status
378		*/
379	<	public void testReadTryLock_Interruptible() throws InterruptedException {
341	<	final CountDownLatch running = new CountDownLatch(1);
379	>	public void testNonInterruptibleOperationsIgnoreInterrupts() {
380		final StampedLock lock = new StampedLock();
381	<	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	<	}});
381	>	Thread.currentThread().interrupt();
382
383	<	running.await();
384	<	waitForThreadToEnterWaitState(t, 100);
385	<	t.interrupt();
386	<	awaitTermination(t);
387	<	releaseWriteLock(lock, s);
383	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
384	>	long s = assertValid(lock, lock.readLock());
385	>	readUnlocker.accept(lock, s);
386	>	s = assertValid(lock, lock.tryReadLock());
387	>	readUnlocker.accept(lock, s);
388	>	}
389	>
390	>	lock.asReadLock().lock();
391	>	lock.asReadLock().unlock();
392	>
393	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
394	>	long s = assertValid(lock, lock.writeLock());
395	>	writeUnlocker.accept(lock, s);
396	>	s = assertValid(lock, lock.tryWriteLock());
397	>	writeUnlocker.accept(lock, s);
398	>	}
399	>
400	>	lock.asWriteLock().lock();
401	>	lock.asWriteLock().unlock();
402	>
403	>	assertTrue(Thread.interrupted());
404		}
405
406		/**
407		* tryWriteLock on an unlocked lock succeeds
408		*/
409	<	public void testWriteTryLock() {
409	>	public void testTryWriteLock() {
410		final StampedLock lock = new StampedLock();
411		long s = lock.tryWriteLock();
412		assertTrue(s != 0L);
413		assertTrue(lock.isWriteLocked());
414	<	long s2 = lock.tryWriteLock();
366	<	assertEquals(s2, 0L);
414	>	assertEquals(0L, lock.tryWriteLock());
415		releaseWriteLock(lock, s);
416		}
417
418		/**
419		* tryWriteLock fails if locked
420		*/
421	<	public void testWriteTryLockWhenLocked() {
421	>	public void testTryWriteLockWhenLocked() {
422		final StampedLock lock = new StampedLock();
423		long s = lock.writeLock();
424		Thread t = newStartedThread(new CheckedRunnable() {
425		public void realRun() {
426	<	long ws = lock.tryWriteLock();
379	<	assertTrue(ws == 0L);
426	>	assertEquals(0L, lock.tryWriteLock());
427		}});
428
429	+	assertEquals(0L, lock.tryWriteLock());
430		awaitTermination(t);
431		releaseWriteLock(lock, s);
432		}
#	Line 386 | Line 434 | public class StampedLockTest extends JSR
434		/**
435		* tryReadLock fails if write-locked
436		*/
437	<	public void testReadTryLockWhenLocked() {
437	>	public void testTryReadLockWhenLocked() {
438		final StampedLock lock = new StampedLock();
439		long s = lock.writeLock();
440		Thread t = newStartedThread(new CheckedRunnable() {
441		public void realRun() {
442	<	long rs = lock.tryReadLock();
395	<	assertEquals(rs, 0L);
442	>	assertEquals(0L, lock.tryReadLock());
443		}});
444
445	+	assertEquals(0L, lock.tryReadLock());
446		awaitTermination(t);
447		releaseWriteLock(lock, s);
448		}
#	Line 408 | Line 456 | public class StampedLockTest extends JSR
456		Thread t = newStartedThread(new CheckedRunnable() {
457		public void realRun() throws InterruptedException {
458		long s2 = lock.tryReadLock();
459	<	assertTrue(s2 != 0L);
459	>	assertValid(lock, s2);
460		lock.unlockRead(s2);
461		long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS);
462	<	assertTrue(s3 != 0L);
462	>	assertValid(lock, s3);
463		lock.unlockRead(s3);
464		long s4 = lock.readLock();
465	+	assertValid(lock, s4);
466		lock.unlockRead(s4);
467	+	lock.asReadLock().lock();
468	+	lock.asReadLock().unlock();
469	+	lock.asReadLock().lockInterruptibly();
470	+	lock.asReadLock().unlock();
471	+	lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS);
472	+	lock.asReadLock().unlock();
473		}});
474
475		awaitTermination(t);
#	Line 422 | Line 477 | public class StampedLockTest extends JSR
477		}
478
479		/**
480	<	* A writelock succeeds only after a reading thread unlocks
480	>	* writeLock() succeeds only after a reading thread unlocks
481		*/
482		public void testWriteAfterReadLock() throws InterruptedException {
483	<	final CountDownLatch running = new CountDownLatch(1);
483	>	final CountDownLatch aboutToLock = new CountDownLatch(1);
484		final StampedLock lock = new StampedLock();
485		long rs = lock.readLock();
486		Thread t = newStartedThread(new CheckedRunnable() {
487		public void realRun() {
488	<	running.countDown();
488	>	aboutToLock.countDown();
489		long s = lock.writeLock();
490	+	assertTrue(lock.isWriteLocked());
491	+	assertFalse(lock.isReadLocked());
492		lock.unlockWrite(s);
493		}});
494
495	<	running.await();
496	<	waitForThreadToEnterWaitState(t, 100);
495	>	await(aboutToLock);
496	>	assertThreadBlocks(t, Thread.State.WAITING);
497		assertFalse(lock.isWriteLocked());
498	+	assertTrue(lock.isReadLocked());
499		lock.unlockRead(rs);
500		awaitTermination(t);
501	<	assertFalse(lock.isWriteLocked());
501	>	assertUnlocked(lock);
502		}
503
504		/**
505	<	* A writelock succeeds only after reading threads unlock
505	>	* writeLock() succeeds only after reading threads unlock
506		*/
507		public void testWriteAfterMultipleReadLocks() {
508		final StampedLock lock = new StampedLock();
#	Line 463 | Line 521 | public class StampedLockTest extends JSR
521		lock.unlockWrite(ws);
522		}});
523
524	+	assertTrue(lock.isReadLocked());
525		assertFalse(lock.isWriteLocked());
526		lock.unlockRead(s);
527		awaitTermination(t2);
528	<	assertFalse(lock.isWriteLocked());
528	>	assertUnlocked(lock);
529		}
530
531		/**
532	<	* Readlocks succeed only after a writing thread unlocks
532	>	* readLock() succeed only after a writing thread unlocks
533		*/
534		public void testReadAfterWriteLock() {
535		final StampedLock lock = new StampedLock();
536	+	final CountDownLatch threadsStarted = new CountDownLatch(2);
537		final long s = lock.writeLock();
538	<	Thread t1 = newStartedThread(new CheckedRunnable() {
538	>	final Runnable acquireReleaseReadLock = new CheckedRunnable() {
539		public void realRun() {
540	+	threadsStarted.countDown();
541		long rs = lock.readLock();
542	+	assertTrue(lock.isReadLocked());
543	+	assertFalse(lock.isWriteLocked());
544		lock.unlockRead(rs);
545	<	}});
546	<	Thread t2 = newStartedThread(new CheckedRunnable() {
547	<	public void realRun() {
548	<	long rs = lock.readLock();
549	<	lock.unlockRead(rs);
550	<	}});
551	<
545	>	}};
546	>	Thread t1 = newStartedThread(acquireReleaseReadLock);
547	>	Thread t2 = newStartedThread(acquireReleaseReadLock);
548	>
549	>	await(threadsStarted);
550	>	assertThreadBlocks(t1, Thread.State.WAITING);
551	>	assertThreadBlocks(t2, Thread.State.WAITING);
552	>	assertTrue(lock.isWriteLocked());
553	>	assertFalse(lock.isReadLocked());
554		releaseWriteLock(lock, s);
555		awaitTermination(t1);
556		awaitTermination(t2);
557	+	assertUnlocked(lock);
558		}
559
560		/**
561	<	* tryReadLock succeeds if readlocked but not writelocked
561	>	* tryReadLock succeeds if read locked but not write locked
562		*/
563		public void testTryLockWhenReadLocked() {
564		final StampedLock lock = new StampedLock();
#	Line 500 | Line 566 | public class StampedLockTest extends JSR
566		Thread t = newStartedThread(new CheckedRunnable() {
567		public void realRun() {
568		long rs = lock.tryReadLock();
569	<	threadAssertTrue(rs != 0L);
569	>	assertValid(lock, rs);
570		lock.unlockRead(rs);
571		}});
572
#	Line 509 | Line 575 | public class StampedLockTest extends JSR
575		}
576
577		/**
578	<	* tryWriteLock fails when readlocked
578	>	* tryWriteLock fails when read locked
579		*/
580	<	public void testWriteTryLockWhenReadLocked() {
580	>	public void testTryWriteLockWhenReadLocked() {
581		final StampedLock lock = new StampedLock();
582		long s = lock.readLock();
583		Thread t = newStartedThread(new CheckedRunnable() {
584		public void realRun() {
585	<	long ws = lock.tryWriteLock();
520	<	threadAssertEquals(ws, 0L);
585	>	threadAssertEquals(0L, lock.tryWriteLock());
586		}});
587
588		awaitTermination(t);
#	Line 525 | Line 590 | public class StampedLockTest extends JSR
590		}
591
592		/**
593	<	* timed tryWriteLock times out if locked
593	>	* timed lock operations time out if lock not available
594		*/
595	<	public void testWriteTryLock_Timeout() {
595	>	public void testTimedLock_Timeout() throws Exception {
596	>	ArrayList<Future<?>> futures = new ArrayList<>();
597	>
598	>	// Write locked
599		final StampedLock lock = new StampedLock();
600	<	long s = lock.writeLock();
601	<	Thread t = newStartedThread(new CheckedRunnable() {
600	>	long stamp = lock.writeLock();
601	>	assertEquals(0L, lock.tryReadLock(0L, DAYS));
602	>	assertEquals(0L, lock.tryReadLock(Long.MIN_VALUE, DAYS));
603	>	assertFalse(lock.asReadLock().tryLock(0L, DAYS));
604	>	assertFalse(lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS));
605	>	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
606	>	assertEquals(0L, lock.tryWriteLock(Long.MIN_VALUE, DAYS));
607	>	assertFalse(lock.asWriteLock().tryLock(0L, DAYS));
608	>	assertFalse(lock.asWriteLock().tryLock(Long.MIN_VALUE, DAYS));
609	>
610	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
611		public void realRun() throws InterruptedException {
612		long startTime = System.nanoTime();
613	<	long timeoutMillis = 10;
614	<	long ws = lock.tryWriteLock(timeoutMillis, MILLISECONDS);
615	<	assertEquals(ws, 0L);
539	<	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
540	<	}});
613	>	assertEquals(0L, lock.tryWriteLock(timeoutMillis(), MILLISECONDS));
614	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
615	>	}}));
616
617	<	awaitTermination(t);
618	<	releaseWriteLock(lock, s);
619	<	}
617	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
618	>	public void realRun() throws InterruptedException {
619	>	long startTime = System.nanoTime();
620	>	assertEquals(0L, lock.tryReadLock(timeoutMillis(), MILLISECONDS));
621	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
622	>	}}));
623	>
624	>	// Read locked
625	>	final StampedLock lock2 = new StampedLock();
626	>	long stamp2 = lock2.readLock();
627	>	assertEquals(0L, lock2.tryWriteLock(0L, DAYS));
628	>	assertEquals(0L, lock2.tryWriteLock(Long.MIN_VALUE, DAYS));
629	>	assertFalse(lock2.asWriteLock().tryLock(0L, DAYS));
630	>	assertFalse(lock2.asWriteLock().tryLock(Long.MIN_VALUE, DAYS));
631
632	<	/**
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() {
632	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
633		public void realRun() throws InterruptedException {
634		long startTime = System.nanoTime();
635	<	long timeoutMillis = 10;
636	<	long rs = lock.tryReadLock(timeoutMillis, MILLISECONDS);
637	<	assertEquals(rs, 0L);
558	<	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
559	<	}});
635	>	assertEquals(0L, lock2.tryWriteLock(timeoutMillis(), MILLISECONDS));
636	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
637	>	}}));
638
639	<	awaitTermination(t);
640	<	assertTrue(lock.isWriteLocked());
641	<	lock.unlockWrite(s);
639	>	for (Future<?> future : futures)
640	>	assertNull(future.get());
641	>
642	>	releaseWriteLock(lock, stamp);
643	>	releaseReadLock(lock2, stamp2);
644		}
645
646		/**
647	<	* writeLockInterruptibly succeeds if unlocked, else is interruptible
647	>	* writeLockInterruptibly succeeds if unlocked
648		*/
649		public void testWriteLockInterruptibly() throws InterruptedException {
570	–	final CountDownLatch running = new CountDownLatch(1);
650		final StampedLock lock = new StampedLock();
651		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();
652		assertTrue(lock.isWriteLocked());
583	–	awaitTermination(t);
653		releaseWriteLock(lock, s);
654		}
655
656		/**
657	<	* readLockInterruptibly succeeds if lock free else is interruptible
657	>	* readLockInterruptibly succeeds if lock free
658		*/
659		public void testReadLockInterruptibly() throws InterruptedException {
591	–	final CountDownLatch running = new CountDownLatch(1);
660		final StampedLock lock = new StampedLock();
661	<	long s;
662	<	s = lock.readLockInterruptibly();
661	>
662	>	long s = assertValid(lock, lock.readLockInterruptibly());
663	>	assertTrue(lock.isReadLocked());
664		lock.unlockRead(s);
596	–	s = lock.writeLockInterruptibly();
597	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
598	–	public void realRun() throws InterruptedException {
599	–	running.countDown();
600	–	lock.readLockInterruptibly();
601	–	}});
665
666	<	running.await();
667	<	waitForThreadToEnterWaitState(t, 100);
668	<	t.interrupt();
606	<	awaitTermination(t);
607	<	releaseWriteLock(lock, s);
666	>	lock.asReadLock().lockInterruptibly();
667	>	assertTrue(lock.isReadLocked());
668	>	lock.asReadLock().unlock();
669		}
670
671		/**
#	Line 636 | Line 697 | public class StampedLockTest extends JSR
697		}
698
699		/**
700	<	* tryOptimisticRead succeeds and validates if unlocked, fails if locked
700	>	* tryOptimisticRead succeeds and validates if unlocked, fails if
701	>	* exclusively locked
702		*/
703		public void testValidateOptimistic() throws InterruptedException {
704		StampedLock lock = new StampedLock();
705	<	long s, p;
706	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
707	<	assertTrue(lock.validate(p));
708	<	assertTrue((s = lock.writeLock()) != 0L);
709	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
710	<	assertTrue(lock.validate(s));
711	<	lock.unlockWrite(s);
712	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
713	<	assertTrue(lock.validate(p));
714	<	assertTrue((s = lock.readLock()) != 0L);
715	<	assertTrue(lock.validate(s));
716	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
717	<	assertTrue(lock.validate(p));
718	<	lock.unlockRead(s);
719	<	assertTrue((s = lock.tryWriteLock()) != 0L);
720	<	assertTrue(lock.validate(s));
721	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
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);
705	>
706	>	assertValid(lock, lock.tryOptimisticRead());
707	>
708	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
709	>	long s = assertValid(lock, writeLocker.apply(lock));
710	>	assertEquals(0L, lock.tryOptimisticRead());
711	>	releaseWriteLock(lock, s);
712	>	}
713	>
714	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
715	>	long s = assertValid(lock, readLocker.apply(lock));
716	>	long p = assertValid(lock, lock.tryOptimisticRead());
717	>	releaseReadLock(lock, s);
718	>	assertTrue(lock.validate(p));
719	>	}
720	>
721	>	assertValid(lock, lock.tryOptimisticRead());
722		}
723
724		/**
725		* tryOptimisticRead stamp does not validate if a write lock intervenes
726		*/
727		public void testValidateOptimisticWriteLocked() {
728	<	StampedLock lock = new StampedLock();
729	<	long s, p;
730	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
684	<	assertTrue((s = lock.writeLock()) != 0L);
728	>	final StampedLock lock = new StampedLock();
729	>	final long p = assertValid(lock, lock.tryOptimisticRead());
730	>	final long s = assertValid(lock, lock.writeLock());
731		assertFalse(lock.validate(p));
732	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
732	>	assertEquals(0L, lock.tryOptimisticRead());
733		assertTrue(lock.validate(s));
734		lock.unlockWrite(s);
735		}
#	Line 694 | Line 740 | public class StampedLockTest extends JSR
740		*/
741		public void testValidateOptimisticWriteLocked2()
742		throws InterruptedException {
743	<	final CountDownLatch running = new CountDownLatch(1);
743	>	final CountDownLatch locked = new CountDownLatch(1);
744		final StampedLock lock = new StampedLock();
745	<	long s, p;
746	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
745	>	final long p = assertValid(lock, lock.tryOptimisticRead());
746	>
747		Thread t = newStartedThread(new CheckedInterruptedRunnable() {
748		public void realRun() throws InterruptedException {
749		lock.writeLockInterruptibly();
750	<	running.countDown();
750	>	locked.countDown();
751		lock.writeLockInterruptibly();
752		}});
753
754	<	running.await();
754	>	await(locked);
755		assertFalse(lock.validate(p));
756	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
756	>	assertEquals(0L, lock.tryOptimisticRead());
757	>	assertThreadBlocks(t, Thread.State.WAITING);
758		t.interrupt();
759		awaitTermination(t);
760	+	assertTrue(lock.isWriteLocked());
761		}
762
763		/**
764	<	* tryConvertToOptimisticRead succeeds and validates if successfully locked,
764	>	* tryConvertToOptimisticRead succeeds and validates if successfully locked
765		*/
766		public void testTryConvertToOptimisticRead() throws InterruptedException {
767		StampedLock lock = new StampedLock();
768	<	long s, p;
768	>	long s, p, q;
769		assertEquals(0L, lock.tryConvertToOptimisticRead(0L));
770
771	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
771	>	s = assertValid(lock, lock.tryOptimisticRead());
772		assertEquals(s, lock.tryConvertToOptimisticRead(s));
773		assertTrue(lock.validate(s));
774
775	<	assertTrue((p = lock.readLock()) != 0L);
776	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
777	<	assertEquals(s, lock.tryConvertToOptimisticRead(s));
778	<	assertTrue(lock.validate(s));
779	<	lock.unlockRead(p);
780	<
781	<	assertTrue((s = lock.writeLock()) != 0L);
734	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
735	<	assertTrue(lock.validate(p));
736	<
737	<	assertTrue((s = lock.readLock()) != 0L);
738	<	assertTrue(lock.validate(s));
739	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
740	<	assertTrue(lock.validate(p));
741	<
742	<	assertTrue((s = lock.tryWriteLock()) != 0L);
743	<	assertTrue(lock.validate(s));
744	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
745	<	assertTrue(lock.validate(p));
746	<
747	<	assertTrue((s = lock.tryReadLock()) != 0L);
748	<	assertTrue(lock.validate(s));
749	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
750	<	assertTrue(lock.validate(p));
751	<
752	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
753	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
754	<	assertTrue(lock.validate(p));
775	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
776	>	s = assertValid(lock, writeLocker.apply(lock));
777	>	p = assertValid(lock, lock.tryConvertToOptimisticRead(s));
778	>	assertFalse(lock.validate(s));
779	>	assertTrue(lock.validate(p));
780	>	assertUnlocked(lock);
781	>	}
782
783	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
784	<	assertTrue(lock.validate(s));
785	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
786	<	assertTrue(lock.validate(p));
783	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
784	>	s = assertValid(lock, readLocker.apply(lock));
785	>	q = assertValid(lock, lock.tryOptimisticRead());
786	>	assertEquals(q, lock.tryConvertToOptimisticRead(q));
787	>	assertTrue(lock.validate(q));
788	>	assertTrue(lock.isReadLocked());
789	>	p = assertValid(lock, lock.tryConvertToOptimisticRead(s));
790	>	assertTrue(lock.validate(p));
791	>	assertTrue(lock.validate(s));
792	>	assertUnlocked(lock);
793	>	assertEquals(q, lock.tryConvertToOptimisticRead(q));
794	>	assertTrue(lock.validate(q));
795	>	}
796		}
797
798		/**
799	<	* tryConvertToReadLock succeeds and validates if successfully locked
764	<	* or lock free;
799	>	* tryConvertToReadLock succeeds for valid stamps
800		*/
801		public void testTryConvertToReadLock() throws InterruptedException {
802		StampedLock lock = new StampedLock();
803		long s, p;
804	<	s = 0L;
805	<	assertFalse((p = lock.tryConvertToReadLock(s)) != 0L);
806	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
807	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
808	<	lock.unlockRead(p);
809	<	assertTrue((s = lock.writeLock()) != 0L);
810	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
776	<	assertTrue(lock.validate(p));
777	<	lock.unlockRead(p);
778	<	assertTrue((s = lock.readLock()) != 0L);
779	<	assertTrue(lock.validate(s));
780	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
781	<	assertTrue(lock.validate(p));
782	<	lock.unlockRead(p);
783	<	assertTrue((s = lock.tryWriteLock()) != 0L);
784	<	assertTrue(lock.validate(s));
785	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
786	<	assertTrue(lock.validate(p));
787	<	lock.unlockRead(p);
788	<	assertTrue((s = lock.tryReadLock()) != 0L);
804	>
805	>	assertEquals(0L, lock.tryConvertToReadLock(0L));
806	>
807	>	s = assertValid(lock, lock.tryOptimisticRead());
808	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
809	>	assertTrue(lock.isReadLocked());
810	>	assertEquals(1, lock.getReadLockCount());
811		assertTrue(lock.validate(s));
790	–	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
791	–	assertTrue(lock.validate(p));
812		lock.unlockRead(p);
813	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
814	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
815	<	assertTrue(lock.validate(p));
813	>
814	>	s = assertValid(lock, lock.tryOptimisticRead());
815	>	lock.readLock();
816	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
817	>	assertTrue(lock.isReadLocked());
818	>	assertEquals(2, lock.getReadLockCount());
819		lock.unlockRead(p);
797	–	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
798	–	assertTrue(lock.validate(s));
799	–	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
800	–	assertTrue(lock.validate(p));
820		lock.unlockRead(p);
821	+	assertUnlocked(lock);
822	+
823	+	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
824	+	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
825	+	s = assertValid(lock, writeLocker.apply(lock));
826	+	p = assertValid(lock, lock.tryConvertToReadLock(s));
827	+	assertFalse(lock.validate(s));
828	+	assertTrue(lock.isReadLocked());
829	+	assertEquals(1, lock.getReadLockCount());
830	+	readUnlocker.accept(lock, p);
831	+	}
832	+
833	+	for (Function<StampedLock, Long> readLocker : readLockers()) {
834	+	s = assertValid(lock, readLocker.apply(lock));
835	+	assertEquals(s, lock.tryConvertToReadLock(s));
836	+	assertTrue(lock.validate(s));
837	+	assertTrue(lock.isReadLocked());
838	+	assertEquals(1, lock.getReadLockCount());
839	+	readUnlocker.accept(lock, s);
840	+	}
841	+	}
842		}
843
844		/**
845	<	* tryConvertToWriteLock succeeds and validates if successfully locked
806	<	* or lock free;
845	>	* tryConvertToWriteLock succeeds if lock available; fails if multiply read locked
846		*/
847		public void testTryConvertToWriteLock() throws InterruptedException {
848		StampedLock lock = new StampedLock();
849		long s, p;
850
851	<	assertFalse((p = lock.tryConvertToWriteLock(0L)) != 0L);
851	>	assertEquals(0L, lock.tryConvertToWriteLock(0L));
852
853		assertTrue((s = lock.tryOptimisticRead()) != 0L);
854		assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
855	+	assertTrue(lock.isWriteLocked());
856		lock.unlockWrite(p);
857
858	<	assertTrue((s = lock.writeLock()) != 0L);
859	<	assertEquals(s, lock.tryConvertToWriteLock(s));
860	<	assertTrue(lock.validate(s));
861	<	lock.unlockWrite(s);
862	<
863	<	assertTrue((s = lock.readLock()) != 0L);
864	<	assertTrue(lock.validate(s));
865	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
866	<	assertTrue(lock.validate(p));
867	<	lock.unlockWrite(p);
868	<
869	<	assertTrue((s = lock.tryWriteLock()) != 0L);
870	<	assertTrue(lock.validate(s));
871	<	assertEquals(s, lock.tryConvertToWriteLock(s));
872	<	assertTrue(lock.validate(s));
873	<	lock.unlockWrite(s);
874	<
875	<	assertTrue((s = lock.tryReadLock()) != 0L);
836	<	assertTrue(lock.validate(s));
837	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
838	<	assertTrue(lock.validate(p));
839	<	lock.unlockWrite(p);
840	<
841	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
842	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
843	<	assertTrue(lock.validate(p));
844	<	lock.unlockWrite(p);
858	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
859	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
860	>	s = assertValid(lock, writeLocker.apply(lock));
861	>	assertEquals(s, lock.tryConvertToWriteLock(s));
862	>	assertTrue(lock.validate(s));
863	>	assertTrue(lock.isWriteLocked());
864	>	writeUnlocker.accept(lock, s);
865	>	}
866	>
867	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
868	>	s = assertValid(lock, readLocker.apply(lock));
869	>	p = assertValid(lock, lock.tryConvertToWriteLock(s));
870	>	assertFalse(lock.validate(s));
871	>	assertTrue(lock.validate(p));
872	>	assertTrue(lock.isWriteLocked());
873	>	writeUnlocker.accept(lock, p);
874	>	}
875	>	}
876
877	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
878	<	assertTrue(lock.validate(s));
879	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
880	<	assertTrue(lock.validate(p));
881	<	lock.unlockWrite(p);
877	>	// failure if multiply read locked
878	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
879	>	s = assertValid(lock, readLocker.apply(lock));
880	>	p = assertValid(lock, readLocker.apply(lock));
881	>	assertEquals(0L, lock.tryConvertToWriteLock(s));
882	>	assertTrue(lock.validate(s));
883	>	assertTrue(lock.validate(p));
884	>	assertEquals(2, lock.getReadLockCount());
885	>	lock.unlock(p);
886	>	lock.unlock(s);
887	>	assertUnlocked(lock);
888	>	}
889		}
890
891		/**
892		* asWriteLock can be locked and unlocked
893		*/
894	<	public void testAsWriteLock() {
894	>	public void testAsWriteLock() throws Throwable {
895		StampedLock sl = new StampedLock();
896		Lock lock = sl.asWriteLock();
897	<	lock.lock();
898	<	assertFalse(lock.tryLock());
899	<	lock.unlock();
900	<	assertTrue(lock.tryLock());
897	>	for (Action locker : lockLockers(lock)) {
898	>	locker.run();
899	>	assertTrue(sl.isWriteLocked());
900	>	assertFalse(sl.isReadLocked());
901	>	assertFalse(lock.tryLock());
902	>	lock.unlock();
903	>	assertUnlocked(sl);
904	>	}
905		}
906
907		/**
908		* asReadLock can be locked and unlocked
909		*/
910	<	public void testAsReadLock() {
910	>	public void testAsReadLock() throws Throwable {
911		StampedLock sl = new StampedLock();
912		Lock lock = sl.asReadLock();
913	<	lock.lock();
914	<	lock.unlock();
915	<	assertTrue(lock.tryLock());
913	>	for (Action locker : lockLockers(lock)) {
914	>	locker.run();
915	>	assertTrue(sl.isReadLocked());
916	>	assertFalse(sl.isWriteLocked());
917	>	assertEquals(1, sl.getReadLockCount());
918	>	locker.run();
919	>	assertTrue(sl.isReadLocked());
920	>	assertEquals(2, sl.getReadLockCount());
921	>	lock.unlock();
922	>	lock.unlock();
923	>	assertUnlocked(sl);
924	>	}
925		}
926
927		/**
928		* asReadWriteLock.writeLock can be locked and unlocked
929		*/
930	<	public void testAsReadWriteLockWriteLock() {
930	>	public void testAsReadWriteLockWriteLock() throws Throwable {
931		StampedLock sl = new StampedLock();
932		Lock lock = sl.asReadWriteLock().writeLock();
933	<	lock.lock();
934	<	assertFalse(lock.tryLock());
935	<	lock.unlock();
936	<	assertTrue(lock.tryLock());
933	>	for (Action locker : lockLockers(lock)) {
934	>	locker.run();
935	>	assertTrue(sl.isWriteLocked());
936	>	assertFalse(sl.isReadLocked());
937	>	assertFalse(lock.tryLock());
938	>	lock.unlock();
939	>	assertUnlocked(sl);
940	>	}
941		}
942
943		/**
944		* asReadWriteLock.readLock can be locked and unlocked
945		*/
946	<	public void testAsReadWriteLockReadLock() {
946	>	public void testAsReadWriteLockReadLock() throws Throwable {
947		StampedLock sl = new StampedLock();
948		Lock lock = sl.asReadWriteLock().readLock();
949	<	lock.lock();
950	<	lock.unlock();
951	<	assertTrue(lock.tryLock());
949	>	for (Action locker : lockLockers(lock)) {
950	>	locker.run();
951	>	assertTrue(sl.isReadLocked());
952	>	assertFalse(sl.isWriteLocked());
953	>	assertEquals(1, sl.getReadLockCount());
954	>	locker.run();
955	>	assertTrue(sl.isReadLocked());
956	>	assertEquals(2, sl.getReadLockCount());
957	>	lock.unlock();
958	>	lock.unlock();
959	>	assertUnlocked(sl);
960	>	}
961		}
962
963		/**
#	Line 916 | Line 980 | public class StampedLockTest extends JSR
980		Runnable[] actions = {
981		() -> {
982		StampedLock sl = new StampedLock();
983	<	long stamp = sl.tryOptimisticRead();
920	<	assertTrue(stamp != 0);
983	>	long stamp = assertValid(sl, sl.tryOptimisticRead());
984		sl.unlockRead(stamp);
985		},
986		() -> {
#	Line 934 | Line 997 | public class StampedLockTest extends JSR
997		},
998		() -> {
999		StampedLock sl = new StampedLock();
937	–	long stamp = sl.tryOptimisticRead();
1000		sl.readLock();
1001	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
1002		sl.unlockRead(stamp);
1003		},
1004		() -> {
1005		StampedLock sl = new StampedLock();
943	–	long stamp = sl.tryOptimisticRead();
1006		sl.readLock();
1007	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
1008		sl.unlock(stamp);
1009		},
1010
1011		() -> {
1012		StampedLock sl = new StampedLock();
1013		long stamp = sl.tryConvertToOptimisticRead(sl.writeLock());
1014	<	assertTrue(stamp != 0);
1014	>	assertValid(sl, stamp);
1015		sl.writeLock();
1016		sl.unlockWrite(stamp);
1017		},
#	Line 974 | Line 1037 | public class StampedLockTest extends JSR
1037		() -> {
1038		StampedLock sl = new StampedLock();
1039		long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1040	<	assertTrue(stamp != 0);
1040	>	assertValid(sl, stamp);
1041		sl.writeLock();
1042		sl.unlockWrite(stamp);
1043		},
#	Line 994 | Line 1057 | public class StampedLockTest extends JSR
1057		StampedLock sl = new StampedLock();
1058		sl.readLock();
1059		long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1060	<	assertTrue(stamp != 0);
1060	>	assertValid(sl, stamp);
1061		sl.readLock();
1062		sl.unlockRead(stamp);
1063		},
#	Line 1016 | Line 1079 | public class StampedLockTest extends JSR
1079		assertThrows(IllegalMonitorStateException.class, actions);
1080		}
1081
1082	+	static long writeLockInterruptiblyUninterrupted(StampedLock sl) {
1083	+	try { return sl.writeLockInterruptibly(); }
1084	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1085	+	}
1086	+
1087	+	static long tryWriteLockUninterrupted(StampedLock sl, long time, TimeUnit unit) {
1088	+	try { return sl.tryWriteLock(time, unit); }
1089	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1090	+	}
1091	+
1092	+	static long readLockInterruptiblyUninterrupted(StampedLock sl) {
1093	+	try { return sl.readLockInterruptibly(); }
1094	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1095	+	}
1096	+
1097	+	static long tryReadLockUninterrupted(StampedLock sl, long time, TimeUnit unit) {
1098	+	try { return sl.tryReadLock(time, unit); }
1099	+	catch (InterruptedException ex) { throw new AssertionError(ex); }
1100	+	}
1101	+
1102	+	/**
1103	+	* Invalid stamps result in IllegalMonitorStateException
1104	+	*/
1105	+	public void testInvalidStampsThrowIllegalMonitorStateException() {
1106	+	final StampedLock sl = new StampedLock();
1107	+
1108	+	assertThrows(IllegalMonitorStateException.class,
1109	+	() -> sl.unlockWrite(0L),
1110	+	() -> sl.unlockRead(0L),
1111	+	() -> sl.unlock(0L));
1112	+
1113	+	final long optimisticStamp = sl.tryOptimisticRead();
1114	+	final long readStamp = sl.readLock();
1115	+	sl.unlockRead(readStamp);
1116	+	final long writeStamp = sl.writeLock();
1117	+	sl.unlockWrite(writeStamp);
1118	+	assertTrue(optimisticStamp != 0L && readStamp != 0L && writeStamp != 0L);
1119	+	final long[] noLongerValidStamps = { optimisticStamp, readStamp, writeStamp };
1120	+	final Runnable assertNoLongerValidStampsThrow = () -> {
1121	+	for (long noLongerValidStamp : noLongerValidStamps)
1122	+	assertThrows(IllegalMonitorStateException.class,
1123	+	() -> sl.unlockWrite(noLongerValidStamp),
1124	+	() -> sl.unlockRead(noLongerValidStamp),
1125	+	() -> sl.unlock(noLongerValidStamp));
1126	+	};
1127	+	assertNoLongerValidStampsThrow.run();
1128	+
1129	+	for (Function<StampedLock, Long> readLocker : readLockers())
1130	+	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
1131	+	final long stamp = readLocker.apply(sl);
1132	+	assertValid(sl, stamp);
1133	+	assertNoLongerValidStampsThrow.run();
1134	+	assertThrows(IllegalMonitorStateException.class,
1135	+	() -> sl.unlockWrite(stamp),
1136	+	() -> sl.unlockRead(sl.tryOptimisticRead()),
1137	+	() -> sl.unlockRead(0L));
1138	+	readUnlocker.accept(sl, stamp);
1139	+	assertUnlocked(sl);
1140	+	assertNoLongerValidStampsThrow.run();
1141	+	}
1142	+
1143	+	for (Function<StampedLock, Long> writeLocker : writeLockers())
1144	+	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
1145	+	final long stamp = writeLocker.apply(sl);
1146	+	assertValid(sl, stamp);
1147	+	assertNoLongerValidStampsThrow.run();
1148	+	assertThrows(IllegalMonitorStateException.class,
1149	+	() -> sl.unlockRead(stamp),
1150	+	() -> sl.unlockWrite(0L));
1151	+	writeUnlocker.accept(sl, stamp);
1152	+	assertUnlocked(sl);
1153	+	assertNoLongerValidStampsThrow.run();
1154	+	}
1155	+	}
1156	+
1157	+	/**
1158	+	* Read locks can be very deeply nested
1159	+	*/
1160	+	public void testDeeplyNestedReadLocks() {
1161	+	final StampedLock lock = new StampedLock();
1162	+	final int depth = 300;
1163	+	final long[] stamps = new long[depth];
1164	+	final List<Function<StampedLock, Long>> readLockers = readLockers();
1165	+	final List<BiConsumer<StampedLock, Long>> readUnlockers = readUnlockers();
1166	+	for (int i = 0; i < depth; i++) {
1167	+	Function<StampedLock, Long> readLocker
1168	+	= readLockers.get(i % readLockers.size());
1169	+	long stamp = readLocker.apply(lock);
1170	+	assertEquals(i + 1, lock.getReadLockCount());
1171	+	assertTrue(lock.isReadLocked());
1172	+	stamps[i] = stamp;
1173	+	}
1174	+	for (int i = 0; i < depth; i++) {
1175	+	BiConsumer<StampedLock, Long> readUnlocker
1176	+	= readUnlockers.get(i % readUnlockers.size());
1177	+	assertEquals(depth - i, lock.getReadLockCount());
1178	+	assertTrue(lock.isReadLocked());
1179	+	readUnlocker.accept(lock, stamps[depth - 1 - i]);
1180	+	}
1181	+	assertUnlocked(lock);
1182	+	}
1183	+
1184	+	/**
1185	+	* Stamped locks are not reentrant.
1186	+	*/
1187	+	public void testNonReentrant() throws InterruptedException {
1188	+	final StampedLock lock = new StampedLock();
1189	+	long stamp;
1190	+
1191	+	stamp = lock.writeLock();
1192	+	assertValid(lock, stamp);
1193	+	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1194	+	assertEquals(0L, lock.tryReadLock(0L, DAYS));
1195	+	assertValid(lock, stamp);
1196	+	lock.unlockWrite(stamp);
1197	+
1198	+	stamp = lock.tryWriteLock(1L, DAYS);
1199	+	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1200	+	assertValid(lock, stamp);
1201	+	lock.unlockWrite(stamp);
1202	+
1203	+	stamp = lock.readLock();
1204	+	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
1205	+	assertValid(lock, stamp);
1206	+	lock.unlockRead(stamp);
1207	+	}
1208	+
1209	+	/**
1210	+	* """StampedLocks have no notion of ownership. Locks acquired in
1211	+	* one thread can be released or converted in another."""
1212	+	*/
1213	+	public void testNoOwnership() throws Throwable {
1214	+	ArrayList<Future<?>> futures = new ArrayList<>();
1215	+	for (Function<StampedLock, Long> writeLocker : writeLockers())
1216	+	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
1217	+	StampedLock lock = new StampedLock();
1218	+	long stamp = writeLocker.apply(lock);
1219	+	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
1220	+	public void realRun() {
1221	+	writeUnlocker.accept(lock, stamp);
1222	+	assertUnlocked(lock);
1223	+	assertFalse(lock.validate(stamp));
1224	+	}}));
1225	+	}
1226	+	for (Future<?> future : futures)
1227	+	assertNull(future.get());
1228	+	}
1229		}

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