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

Comparing jsr166/src/test/tck/StampedLockTest.java (file contents):
Revision 1.26 by jsr166, Sun Jul 17 03:06:50 2016 UTC vs.
Revision 1.27 by jsr166, Wed Aug 10 17:05:13 2016 UTC

#	Line 7 | Line 7
7
8		import static java.util.concurrent.TimeUnit.DAYS;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	+	import static java.util.concurrent.TimeUnit.SECONDS;
11
12		import java.util.ArrayList;
13		import java.util.List;
14		import java.util.concurrent.CountDownLatch;
15	+	import java.util.concurrent.Future;
16		import java.util.concurrent.TimeUnit;
17		import java.util.concurrent.locks.Lock;
18		import java.util.concurrent.locks.StampedLock;
#	Line 30 | Line 32 | public class StampedLockTest extends JSR
32		}
33
34		/**
33	–	* A runnable calling writeLockInterruptibly
34	–	*/
35	–	class InterruptibleLockRunnable extends CheckedRunnable {
36	–	final StampedLock lock;
37	–	InterruptibleLockRunnable(StampedLock l) { lock = l; }
38	–	public void realRun() throws InterruptedException {
39	–	lock.writeLockInterruptibly();
40	–	}
41	–	}
42	–
43	–	/**
44	–	* A runnable calling writeLockInterruptibly that expects to be
45	–	* interrupted
46	–	*/
47	–	class InterruptedLockRunnable extends CheckedInterruptedRunnable {
48	–	final StampedLock lock;
49	–	InterruptedLockRunnable(StampedLock l) { lock = l; }
50	–	public void realRun() throws InterruptedException {
51	–	lock.writeLockInterruptibly();
52	–	}
53	–	}
54	–
55	–	/**
35		* Releases write lock, checking isWriteLocked before and after
36		*/
37	<	void releaseWriteLock(StampedLock lock, long s) {
37	>	void releaseWriteLock(StampedLock lock, long stamp) {
38		assertTrue(lock.isWriteLocked());
39	<	lock.unlockWrite(s);
39	>	assertValid(lock, stamp);
40	>	lock.unlockWrite(stamp);
41		assertFalse(lock.isWriteLocked());
42	+	assertFalse(lock.validate(stamp));
43		}
44
45		/**
46	<	* Constructed StampedLock is in unlocked state
46	>	* Releases read lock, checking isReadLocked before and after
47		*/
48	<	public void testConstructor() {
49	<	StampedLock lock;
50	<	lock = new StampedLock();
51	<	assertFalse(lock.isWriteLocked());
48	>	void releaseReadLock(StampedLock lock, long stamp) {
49	>	assertTrue(lock.isReadLocked());
50	>	assertValid(lock, stamp);
51	>	lock.unlockRead(stamp);
52		assertFalse(lock.isReadLocked());
53	<	assertEquals(lock.getReadLockCount(), 0);
53	>	assertTrue(lock.validate(stamp));
54		}
55
56	<	/**
57	<	* write-locking and read-locking an unlocked lock succeed
58	<	*/
78	<	public void testLock() {
79	<	StampedLock lock = new StampedLock();
80	<	assertFalse(lock.isWriteLocked());
81	<	assertFalse(lock.isReadLocked());
82	<	assertEquals(lock.getReadLockCount(), 0);
83	<	long s = lock.writeLock();
84	<	assertTrue(lock.isWriteLocked());
85	<	assertFalse(lock.isReadLocked());
86	<	assertEquals(lock.getReadLockCount(), 0);
87	<	lock.unlockWrite(s);
88	<	assertFalse(lock.isWriteLocked());
89	<	assertFalse(lock.isReadLocked());
90	<	assertEquals(lock.getReadLockCount(), 0);
91	<	long rs = lock.readLock();
92	<	assertFalse(lock.isWriteLocked());
93	<	assertTrue(lock.isReadLocked());
94	<	assertEquals(lock.getReadLockCount(), 1);
95	<	lock.unlockRead(rs);
96	<	assertFalse(lock.isWriteLocked());
97	<	assertFalse(lock.isReadLocked());
98	<	assertEquals(lock.getReadLockCount(), 0);
56	>	long assertNonZero(long v) {
57	>	assertTrue(v != 0L);
58	>	return v;
59		}
60
61	<	/**
62	<	* unlock releases either a read or write lock
63	<	*/
64	<	public void testUnlock() {
105	<	StampedLock lock = new StampedLock();
106	<	assertFalse(lock.isWriteLocked());
107	<	assertFalse(lock.isReadLocked());
108	<	assertEquals(lock.getReadLockCount(), 0);
109	<	long s = lock.writeLock();
110	<	assertTrue(lock.isWriteLocked());
111	<	assertFalse(lock.isReadLocked());
112	<	assertEquals(lock.getReadLockCount(), 0);
113	<	lock.unlock(s);
114	<	assertFalse(lock.isWriteLocked());
115	<	assertFalse(lock.isReadLocked());
116	<	assertEquals(lock.getReadLockCount(), 0);
117	<	long rs = lock.readLock();
118	<	assertFalse(lock.isWriteLocked());
119	<	assertTrue(lock.isReadLocked());
120	<	assertEquals(lock.getReadLockCount(), 1);
121	<	lock.unlock(rs);
122	<	assertFalse(lock.isWriteLocked());
123	<	assertFalse(lock.isReadLocked());
124	<	assertEquals(lock.getReadLockCount(), 0);
61	>	long assertValid(StampedLock lock, long stamp) {
62	>	assertTrue(stamp != 0L);
63	>	assertTrue(lock.validate(stamp));
64	>	return stamp;
65		}
66
67	<	/**
128	<	* tryUnlockRead/Write succeeds if locked in associated mode else
129	<	* returns false
130	<	*/
131	<	public void testTryUnlock() {
132	<	StampedLock lock = new StampedLock();
133	<	assertFalse(lock.isWriteLocked());
67	>	void assertUnlocked(StampedLock lock) {
68		assertFalse(lock.isReadLocked());
135	–	assertEquals(lock.getReadLockCount(), 0);
136	–	long s = lock.writeLock();
137	–	assertTrue(lock.isWriteLocked());
138	–	assertFalse(lock.isReadLocked());
139	–	assertEquals(lock.getReadLockCount(), 0);
140	–	assertFalse(lock.tryUnlockRead());
141	–	assertTrue(lock.tryUnlockWrite());
142	–	assertFalse(lock.tryUnlockWrite());
143	–	assertFalse(lock.tryUnlockRead());
144	–	assertFalse(lock.isWriteLocked());
145	–	assertFalse(lock.isReadLocked());
146	–	assertEquals(lock.getReadLockCount(), 0);
147	–	long rs = lock.readLock();
148	–	assertFalse(lock.isWriteLocked());
149	–	assertTrue(lock.isReadLocked());
150	–	assertEquals(lock.getReadLockCount(), 1);
151	–	assertFalse(lock.tryUnlockWrite());
152	–	assertTrue(lock.tryUnlockRead());
153	–	assertFalse(lock.tryUnlockRead());
154	–	assertFalse(lock.tryUnlockWrite());
69		assertFalse(lock.isWriteLocked());
70	<	assertFalse(lock.isReadLocked());
71	<	assertEquals(lock.getReadLockCount(), 0);
70	>	assertEquals(0, lock.getReadLockCount());
71	>	assertValid(lock, lock.tryOptimisticRead());
72		}
73
74	<	/**
75	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
76	<	*/
77	<	public void testWriteUnlock_IMSE() {
78	<	StampedLock lock = new StampedLock();
79	<	try {
80	<	lock.unlockWrite(0L);
81	<	shouldThrow();
82	<	} catch (IllegalMonitorStateException success) {}
74	>	List<Action> lockLockers(Lock lock) {
75	>	List<Action> lockers = new ArrayList<>();
76	>	lockers.add(() -> lock.lock());
77	>	lockers.add(() -> lock.lockInterruptibly());
78	>	lockers.add(() -> lock.tryLock());
79	>	lockers.add(() -> lock.tryLock(Long.MIN_VALUE, DAYS));
80	>	lockers.add(() -> lock.tryLock(0L, DAYS));
81	>	lockers.add(() -> lock.tryLock(Long.MAX_VALUE, DAYS));
82	>	return lockers;
83	>	}
84	>
85	>	List<Function<StampedLock, Long>> readLockers() {
86	>	List<Function<StampedLock, Long>> readLockers = new ArrayList<>();
87	>	readLockers.add((sl) -> sl.readLock());
88	>	readLockers.add((sl) -> sl.tryReadLock());
89	>	readLockers.add((sl) -> readLockInterruptiblyUninterrupted(sl));
90	>	readLockers.add((sl) -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
91	>	readLockers.add((sl) -> tryReadLockUninterrupted(sl, 0L, DAYS));
92	>	readLockers.add((sl) -> sl.tryConvertToReadLock(sl.tryOptimisticRead()));
93	>	return readLockers;
94	>	}
95	>
96	>	List<BiConsumer<StampedLock, Long>> readUnlockers() {
97	>	List<BiConsumer<StampedLock, Long>> readUnlockers = new ArrayList<>();
98	>	readUnlockers.add((sl, stamp) -> sl.unlockRead(stamp));
99	>	readUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockRead()));
100	>	readUnlockers.add((sl, stamp) -> sl.asReadLock().unlock());
101	>	readUnlockers.add((sl, stamp) -> sl.unlock(stamp));
102	>	readUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp)));
103	>	return readUnlockers;
104	>	}
105	>
106	>	List<Function<StampedLock, Long>> writeLockers() {
107	>	List<Function<StampedLock, Long>> writeLockers = new ArrayList<>();
108	>	writeLockers.add((sl) -> sl.writeLock());
109	>	writeLockers.add((sl) -> sl.tryWriteLock());
110	>	writeLockers.add((sl) -> writeLockInterruptiblyUninterrupted(sl));
111	>	writeLockers.add((sl) -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
112	>	writeLockers.add((sl) -> tryWriteLockUninterrupted(sl, 0L, DAYS));
113	>	writeLockers.add((sl) -> sl.tryConvertToWriteLock(sl.tryOptimisticRead()));
114	>	return writeLockers;
115	>	}
116	>
117	>	List<BiConsumer<StampedLock, Long>> writeUnlockers() {
118	>	List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>();
119	>	writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp));
120	>	writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite()));
121	>	writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock());
122	>	writeUnlockers.add((sl, stamp) -> sl.unlock(stamp));
123	>	writeUnlockers.add((sl, stamp) -> assertValid(sl, sl.tryConvertToOptimisticRead(stamp)));
124	>	return writeUnlockers;
125		}
126
127		/**
128	<	* write-unlocking an unlocked lock throws IllegalMonitorStateException
128	>	* Constructed StampedLock is in unlocked state
129		*/
130	<	public void testWriteUnlock_IMSE2() {
131	<	StampedLock lock = new StampedLock();
176	<	long s = lock.writeLock();
177	<	lock.unlockWrite(s);
178	<	try {
179	<	lock.unlockWrite(s);
180	<	shouldThrow();
181	<	} catch (IllegalMonitorStateException success) {}
130	>	public void testConstructor() {
131	>	assertUnlocked(new StampedLock());
132		}
133
134		/**
135	<	* write-unlocking after readlock throws IllegalMonitorStateException
135	>	* write-locking, then unlocking, an unlocked lock succeed
136		*/
137	<	public void testWriteUnlock_IMSE3() {
137	>	public void testWriteLock_lockUnlock() {
138		StampedLock lock = new StampedLock();
139	<	long s = lock.readLock();
140	<	try {
141	<	lock.unlockWrite(s);
142	<	shouldThrow();
143	<	} catch (IllegalMonitorStateException success) {}
139	>
140	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
141	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
142	>	assertFalse(lock.isWriteLocked());
143	>	assertFalse(lock.isReadLocked());
144	>	assertEquals(0, lock.getReadLockCount());
145	>
146	>	long s = writeLocker.apply(lock);
147	>	assertValid(lock, s);
148	>	assertTrue(lock.isWriteLocked());
149	>	assertFalse(lock.isReadLocked());
150	>	assertEquals(0, lock.getReadLockCount());
151	>	writeUnlocker.accept(lock, s);
152	>	assertUnlocked(lock);
153	>	}
154		}
155
156		/**
157	<	* read-unlocking an unlocked lock throws IllegalMonitorStateException
157	>	* read-locking, then unlocking, an unlocked lock succeed
158		*/
159	<	public void testReadUnlock_IMSE() {
159	>	public void testReadLock_lockUnlock() {
160		StampedLock lock = new StampedLock();
161	<	long s = lock.readLock();
162	<	lock.unlockRead(s);
163	<	try {
164	<	lock.unlockRead(s);
165	<	shouldThrow();
166	<	} catch (IllegalMonitorStateException success) {}
161	>
162	>	for (Function<StampedLock, Long> readLocker : readLockers())
163	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
164	>	long s = 42;
165	>	for (int i = 0; i < 2; i++) {
166	>	s = assertValid(lock, readLocker.apply(lock));
167	>	assertFalse(lock.isWriteLocked());
168	>	assertTrue(lock.isReadLocked());
169	>	assertEquals(i + 1, lock.getReadLockCount());
170	>	}
171	>	for (int i = 0; i < 2; i++) {
172	>	assertFalse(lock.isWriteLocked());
173	>	assertTrue(lock.isReadLocked());
174	>	assertEquals(2 - i, lock.getReadLockCount());
175	>	readUnlocker.accept(lock, s);
176	>	}
177	>	assertUnlocked(lock);
178	>	}
179		}
180
181		/**
182	<	* read-unlocking an unlocked lock throws IllegalMonitorStateException
182	>	* tryUnlockWrite fails if not write locked
183		*/
184	<	public void testReadUnlock_IMSE2() {
184	>	public void testTryUnlockWrite_failure() {
185		StampedLock lock = new StampedLock();
186	<	try {
187	<	lock.unlockRead(0L);
188	<	shouldThrow();
189	<	} catch (IllegalMonitorStateException success) {}
186	>	assertFalse(lock.tryUnlockWrite());
187	>
188	>	for (Function<StampedLock, Long> readLocker : readLockers())
189	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
190	>	long s = assertValid(lock, readLocker.apply(lock));
191	>	assertFalse(lock.tryUnlockWrite());
192	>	assertTrue(lock.isReadLocked());
193	>	readUnlocker.accept(lock, s);
194	>	assertUnlocked(lock);
195	>	}
196		}
197
198		/**
199	<	* read-unlocking after writeLock throws IllegalMonitorStateException
199	>	* tryUnlockRead fails if not read locked
200		*/
201	<	public void testReadUnlock_IMSE3() {
201	>	public void testTryUnlockRead_failure() {
202		StampedLock lock = new StampedLock();
203	<	long s = lock.writeLock();
204	<	try {
205	<	lock.unlockRead(s);
206	<	shouldThrow();
207	<	} catch (IllegalMonitorStateException success) {}
203	>	assertFalse(lock.tryUnlockRead());
204	>
205	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
206	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
207	>	long s = writeLocker.apply(lock);
208	>	assertFalse(lock.tryUnlockRead());
209	>	assertTrue(lock.isWriteLocked());
210	>	writeUnlocker.accept(lock, s);
211	>	assertUnlocked(lock);
212	>	}
213		}
214
215		/**
216	<	* validate(0) fails
216	>	* validate(0L) fails
217		*/
218		public void testValidate0() {
219		StampedLock lock = new StampedLock();
#	Line 238 | Line 221 | public class StampedLockTest extends JSR
221		}
222
223		/**
224	<	* A stamp obtained from a successful lock operation validates
224	>	* A stamp obtained from a successful lock operation validates while the lock is held
225		*/
226		public void testValidate() throws InterruptedException {
227		StampedLock lock = new StampedLock();
228	<	long s = lock.writeLock();
229	<	assertTrue(lock.validate(s));
230	<	lock.unlockWrite(s);
231	<	s = lock.readLock();
232	<	assertTrue(lock.validate(s));
233	<	lock.unlockRead(s);
234	<	assertTrue((s = lock.tryWriteLock()) != 0L);
235	<	assertTrue(lock.validate(s));
236	<	lock.unlockWrite(s);
237	<	assertTrue((s = lock.tryReadLock()) != 0L);
238	<	assertTrue(lock.validate(s));
239	<	lock.unlockRead(s);
240	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
241	<	assertTrue(lock.validate(s));
259	<	lock.unlockWrite(s);
260	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
261	<	assertTrue(lock.validate(s));
262	<	lock.unlockRead(s);
263	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
228	>
229	>	for (Function<StampedLock, Long> readLocker : readLockers())
230	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
231	>	long s = assertNonZero(readLocker.apply(lock));
232	>	assertTrue(lock.validate(s));
233	>	readUnlocker.accept(lock, s);
234	>	}
235	>
236	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
237	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
238	>	long s = assertNonZero(writeLocker.apply(lock));
239	>	assertTrue(lock.validate(s));
240	>	writeUnlocker.accept(lock, s);
241	>	}
242		}
243
244		/**
#	Line 268 | Line 246 | public class StampedLockTest extends JSR
246		*/
247		public void testValidate2() throws InterruptedException {
248		StampedLock lock = new StampedLock();
249	<	long s;
272	<	assertTrue((s = lock.writeLock()) != 0L);
249	>	long s = assertNonZero(lock.writeLock());
250		assertTrue(lock.validate(s));
251		assertFalse(lock.validate(lock.tryWriteLock()));
252	<	assertFalse(lock.validate(lock.tryWriteLock(10L, MILLISECONDS)));
252	>	assertFalse(lock.validate(lock.tryWriteLock(0L, SECONDS)));
253		assertFalse(lock.validate(lock.tryReadLock()));
254	<	assertFalse(lock.validate(lock.tryReadLock(10L, MILLISECONDS)));
254	>	assertFalse(lock.validate(lock.tryReadLock(0L, SECONDS)));
255		assertFalse(lock.validate(lock.tryOptimisticRead()));
256		lock.unlockWrite(s);
257		}
258
259	+	void assertThrowInterruptedExceptionWhenPreInterrupted(Action[] actions) {
260	+	for (Action action : actions) {
261	+	Thread.currentThread().interrupt();
262	+	try {
263	+	action.run();
264	+	shouldThrow();
265	+	}
266	+	catch (InterruptedException success) {}
267	+	catch (Throwable fail) { threadUnexpectedException(fail); }
268	+	assertFalse(Thread.interrupted());
269	+	}
270	+	}
271	+
272		/**
273	<	* writeLockInterruptibly is interruptible
273	>	* interruptible operations throw InterruptedException when pre-interrupted
274		*/
275	<	public void testWriteLockInterruptibly_Interruptible()
286	<	throws InterruptedException {
275	>	public void testInterruptibleOperationsThrowInterruptedExceptionWhenPreInterrupted() {
276		final CountDownLatch running = new CountDownLatch(1);
277		final StampedLock lock = new StampedLock();
289	–	long s = lock.writeLock();
290	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
291	–	public void realRun() throws InterruptedException {
292	–	running.countDown();
293	–	lock.writeLockInterruptibly();
294	–	}});
278
279	<	running.await();
280	<	waitForThreadToEnterWaitState(t, 100);
281	<	t.interrupt();
282	<	awaitTermination(t);
283	<	releaseWriteLock(lock, s);
279	>	Action[] interruptibleLockActions = {
280	>	() -> lock.writeLockInterruptibly(),
281	>	() -> lock.tryWriteLock(Long.MIN_VALUE, DAYS),
282	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
283	>	() -> lock.readLockInterruptibly(),
284	>	() -> lock.tryReadLock(Long.MIN_VALUE, DAYS),
285	>	() -> lock.tryReadLock(Long.MAX_VALUE, DAYS),
286	>	() -> lock.asWriteLock().lockInterruptibly(),
287	>	() -> lock.asWriteLock().tryLock(0L, DAYS),
288	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
289	>	() -> lock.asReadLock().lockInterruptibly(),
290	>	() -> lock.asReadLock().tryLock(0L, DAYS),
291	>	() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS),
292	>	};
293	>	shuffle(interruptibleLockActions);
294	>
295	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
296	>	{
297	>	long s = lock.writeLock();
298	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
299	>	lock.unlockWrite(s);
300	>	}
301	>	{
302	>	long s = lock.readLock();
303	>	assertThrowInterruptedExceptionWhenPreInterrupted(interruptibleLockActions);
304	>	lock.unlockRead(s);
305	>	}
306	>	}
307	>
308	>	void assertThrowInterruptedExceptionWhenInterrupted(Action[] actions) {
309	>	int n = actions.length;
310	>	Future<?>[] futures = new Future<?>[n];
311	>	CountDownLatch threadsStarted = new CountDownLatch(n);
312	>	CountDownLatch done = new CountDownLatch(n);
313	>
314	>	for (int i = 0; i < n; i++) {
315	>	Action action = actions[i];
316	>	futures[i] = cachedThreadPool.submit(new CheckedRunnable() {
317	>	public void realRun() throws Throwable {
318	>	threadsStarted.countDown();
319	>	try {
320	>	action.run();
321	>	shouldThrow();
322	>	}
323	>	catch (InterruptedException success) {}
324	>	catch (Throwable fail) { threadUnexpectedException(fail); }
325	>	assertFalse(Thread.interrupted());
326	>	done.countDown();
327	>	}});
328	>	}
329	>
330	>	await(threadsStarted);
331	>	assertEquals(n, done.getCount());
332	>	for (Future<?> future : futures) // Interrupt all the tasks
333	>	future.cancel(true);
334	>	await(done);
335		}
336
337		/**
338	<	* timed tryWriteLock is interruptible
338	>	* interruptible operations throw InterruptedException when write locked and interrupted
339		*/
340	<	public void testWriteTryLock_Interruptible() throws InterruptedException {
340	>	public void testInterruptibleOperationsThrowInterruptedExceptionWriteLockedInterrupted() {
341		final CountDownLatch running = new CountDownLatch(1);
342		final StampedLock lock = new StampedLock();
343		long s = lock.writeLock();
310	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
311	–	public void realRun() throws InterruptedException {
312	–	running.countDown();
313	–	lock.tryWriteLock(2 * LONG_DELAY_MS, MILLISECONDS);
314	–	}});
344
345	<	running.await();
346	<	waitForThreadToEnterWaitState(t, 100);
347	<	t.interrupt();
348	<	awaitTermination(t);
349	<	releaseWriteLock(lock, s);
345	>	Action[] interruptibleLockBlockingActions = {
346	>	() -> lock.writeLockInterruptibly(),
347	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
348	>	() -> lock.readLockInterruptibly(),
349	>	() -> lock.tryReadLock(Long.MAX_VALUE, DAYS),
350	>	() -> lock.asWriteLock().lockInterruptibly(),
351	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
352	>	() -> lock.asReadLock().lockInterruptibly(),
353	>	() -> lock.asReadLock().tryLock(Long.MAX_VALUE, DAYS),
354	>	};
355	>	shuffle(interruptibleLockBlockingActions);
356	>
357	>	assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions);
358		}
359
360		/**
361	<	* readLockInterruptibly is interruptible
361	>	* interruptible operations throw InterruptedException when read locked and interrupted
362		*/
363	<	public void testReadLockInterruptibly_Interruptible()
327	<	throws InterruptedException {
363	>	public void testInterruptibleOperationsThrowInterruptedExceptionReadLockedInterrupted() {
364		final CountDownLatch running = new CountDownLatch(1);
365		final StampedLock lock = new StampedLock();
366	<	long s = lock.writeLock();
331	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
332	<	public void realRun() throws InterruptedException {
333	<	running.countDown();
334	<	lock.readLockInterruptibly();
335	<	}});
366	>	long s = lock.readLock();
367
368	<	running.await();
369	<	waitForThreadToEnterWaitState(t, 100);
370	<	t.interrupt();
371	<	awaitTermination(t);
372	<	releaseWriteLock(lock, s);
368	>	Action[] interruptibleLockBlockingActions = {
369	>	() -> lock.writeLockInterruptibly(),
370	>	() -> lock.tryWriteLock(Long.MAX_VALUE, DAYS),
371	>	() -> lock.asWriteLock().lockInterruptibly(),
372	>	() -> lock.asWriteLock().tryLock(Long.MAX_VALUE, DAYS),
373	>	};
374	>	shuffle(interruptibleLockBlockingActions);
375	>
376	>	assertThrowInterruptedExceptionWhenInterrupted(interruptibleLockBlockingActions);
377		}
378
379		/**
380	<	* timed tryReadLock is interruptible
380	>	* Non-interruptible operations ignore and preserve interrupt status
381		*/
382	<	public void testReadTryLock_Interruptible() throws InterruptedException {
348	<	final CountDownLatch running = new CountDownLatch(1);
382	>	public void testNonInterruptibleOperationsIgnoreInterrupts() {
383		final StampedLock lock = new StampedLock();
384	<	long s = lock.writeLock();
351	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
352	<	public void realRun() throws InterruptedException {
353	<	running.countDown();
354	<	lock.tryReadLock(2 * LONG_DELAY_MS, MILLISECONDS);
355	<	}});
384	>	Thread.currentThread().interrupt();
385
386	<	running.await();
387	<	waitForThreadToEnterWaitState(t, 100);
388	<	t.interrupt();
389	<	awaitTermination(t);
390	<	releaseWriteLock(lock, s);
386	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
387	>	long s = assertValid(lock, lock.readLock());
388	>	readUnlocker.accept(lock, s);
389	>	s = assertValid(lock, lock.tryReadLock());
390	>	readUnlocker.accept(lock, s);
391	>	}
392	>
393	>	lock.asReadLock().lock();
394	>	lock.asReadLock().unlock();
395	>
396	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
397	>	long s = assertValid(lock, lock.writeLock());
398	>	writeUnlocker.accept(lock, s);
399	>	s = assertValid(lock, lock.tryWriteLock());
400	>	writeUnlocker.accept(lock, s);
401	>	}
402	>
403	>	lock.asWriteLock().lock();
404	>	lock.asWriteLock().unlock();
405	>
406	>	assertTrue(Thread.interrupted());
407		}
408
409		/**
410		* tryWriteLock on an unlocked lock succeeds
411		*/
412	<	public void testWriteTryLock() {
412	>	public void testTryWriteLock() {
413		final StampedLock lock = new StampedLock();
414		long s = lock.tryWriteLock();
415		assertTrue(s != 0L);
416		assertTrue(lock.isWriteLocked());
417	<	long s2 = lock.tryWriteLock();
373	<	assertEquals(s2, 0L);
417	>	assertEquals(0L, lock.tryWriteLock());
418		releaseWriteLock(lock, s);
419		}
420
421		/**
422		* tryWriteLock fails if locked
423		*/
424	<	public void testWriteTryLockWhenLocked() {
424	>	public void testTryWriteLockWhenLocked() {
425		final StampedLock lock = new StampedLock();
426		long s = lock.writeLock();
427		Thread t = newStartedThread(new CheckedRunnable() {
428		public void realRun() {
429	<	long ws = lock.tryWriteLock();
386	<	assertTrue(ws == 0L);
429	>	assertEquals(0L, lock.tryWriteLock());
430		}});
431
432	+	assertEquals(0L, lock.tryWriteLock());
433		awaitTermination(t);
434		releaseWriteLock(lock, s);
435		}
#	Line 393 | Line 437 | public class StampedLockTest extends JSR
437		/**
438		* tryReadLock fails if write-locked
439		*/
440	<	public void testReadTryLockWhenLocked() {
440	>	public void testTryReadLockWhenLocked() {
441		final StampedLock lock = new StampedLock();
442		long s = lock.writeLock();
443		Thread t = newStartedThread(new CheckedRunnable() {
444		public void realRun() {
445	<	long rs = lock.tryReadLock();
402	<	assertEquals(rs, 0L);
445	>	assertEquals(0L, lock.tryReadLock());
446		}});
447
448	+	assertEquals(0L, lock.tryReadLock());
449		awaitTermination(t);
450		releaseWriteLock(lock, s);
451		}
#	Line 415 | Line 459 | public class StampedLockTest extends JSR
459		Thread t = newStartedThread(new CheckedRunnable() {
460		public void realRun() throws InterruptedException {
461		long s2 = lock.tryReadLock();
462	<	assertTrue(s2 != 0L);
462	>	assertValid(lock, s2);
463		lock.unlockRead(s2);
464		long s3 = lock.tryReadLock(LONG_DELAY_MS, MILLISECONDS);
465	<	assertTrue(s3 != 0L);
465	>	assertValid(lock, s3);
466		lock.unlockRead(s3);
467		long s4 = lock.readLock();
468	+	assertValid(lock, s4);
469		lock.unlockRead(s4);
470	+	lock.asReadLock().lock();
471	+	lock.asReadLock().unlock();
472	+	lock.asReadLock().lockInterruptibly();
473	+	lock.asReadLock().unlock();
474	+	lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS);
475	+	lock.asReadLock().unlock();
476		}});
477
478		awaitTermination(t);
#	Line 443 | Line 494 | public class StampedLockTest extends JSR
494		}});
495
496		running.await();
497	<	waitForThreadToEnterWaitState(t, 100);
497	>	waitForThreadToEnterWaitState(t, MEDIUM_DELAY_MS);
498		assertFalse(lock.isWriteLocked());
499		lock.unlockRead(rs);
500		awaitTermination(t);
#	Line 470 | Line 521 | public class StampedLockTest extends JSR
521		lock.unlockWrite(ws);
522		}});
523
524	+	assertTrue(lock.isReadLocked());
525		assertFalse(lock.isWriteLocked());
526		lock.unlockRead(s);
527		awaitTermination(t2);
#	Line 481 | Line 533 | public class StampedLockTest extends JSR
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() {
539		public void realRun() {
540	+	threadsStarted.countDown();
541		long rs = lock.readLock();
542		lock.unlockRead(rs);
543		}});
544		Thread t2 = newStartedThread(new CheckedRunnable() {
545		public void realRun() {
546	+	threadsStarted.countDown();
547		long rs = lock.readLock();
548		lock.unlockRead(rs);
549		}});
550
551	+	await(threadsStarted);
552	+	waitForThreadToEnterWaitState(t1, MEDIUM_DELAY_MS);
553	+	waitForThreadToEnterWaitState(t2, MEDIUM_DELAY_MS);
554		releaseWriteLock(lock, s);
555		awaitTermination(t1);
556		awaitTermination(t2);
557		}
558
559		/**
560	<	* tryReadLock succeeds if readlocked but not writelocked
560	>	* tryReadLock succeeds if read locked but not write locked
561		*/
562		public void testTryLockWhenReadLocked() {
563		final StampedLock lock = new StampedLock();
#	Line 507 | Line 565 | public class StampedLockTest extends JSR
565		Thread t = newStartedThread(new CheckedRunnable() {
566		public void realRun() {
567		long rs = lock.tryReadLock();
568	<	threadAssertTrue(rs != 0L);
568	>	assertValid(lock, rs);
569		lock.unlockRead(rs);
570		}});
571
#	Line 516 | Line 574 | public class StampedLockTest extends JSR
574		}
575
576		/**
577	<	* tryWriteLock fails when readlocked
577	>	* tryWriteLock fails when read locked
578		*/
579	<	public void testWriteTryLockWhenReadLocked() {
579	>	public void testTryWriteLockWhenReadLocked() {
580		final StampedLock lock = new StampedLock();
581		long s = lock.readLock();
582		Thread t = newStartedThread(new CheckedRunnable() {
583		public void realRun() {
584	<	long ws = lock.tryWriteLock();
527	<	threadAssertEquals(ws, 0L);
584	>	threadAssertEquals(0L, lock.tryWriteLock());
585		}});
586
587		awaitTermination(t);
#	Line 532 | Line 589 | public class StampedLockTest extends JSR
589		}
590
591		/**
592	<	* timed tryWriteLock times out if locked
592	>	* timed lock operations time out if lock not available
593		*/
594	<	public void testWriteTryLock_Timeout() {
594	>	public void testTimedLock_Timeout() throws Exception {
595	>	ArrayList<Future<?>> futures = new ArrayList<>();
596	>
597	>	// Write locked
598		final StampedLock lock = new StampedLock();
599	<	long s = lock.writeLock();
600	<	Thread t = newStartedThread(new CheckedRunnable() {
599	>	long stamp = lock.writeLock();
600	>	assertEquals(0L, lock.tryReadLock(0L, DAYS));
601	>	assertEquals(0L, lock.tryReadLock(Long.MIN_VALUE, DAYS));
602	>	assertFalse(lock.asReadLock().tryLock(0L, DAYS));
603	>	assertFalse(lock.asReadLock().tryLock(Long.MIN_VALUE, DAYS));
604	>	assertEquals(0L, lock.tryWriteLock(0L, DAYS));
605	>	assertEquals(0L, lock.tryWriteLock(Long.MIN_VALUE, DAYS));
606	>	assertFalse(lock.asWriteLock().tryLock(0L, DAYS));
607	>	assertFalse(lock.asWriteLock().tryLock(Long.MIN_VALUE, DAYS));
608	>
609	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
610		public void realRun() throws InterruptedException {
611		long startTime = System.nanoTime();
612	<	long timeoutMillis = 10;
613	<	long ws = lock.tryWriteLock(timeoutMillis, MILLISECONDS);
614	<	assertEquals(ws, 0L);
546	<	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
547	<	}});
612	>	assertEquals(0L, lock.tryWriteLock(timeoutMillis(), MILLISECONDS));
613	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
614	>	}}));
615
616	<	awaitTermination(t);
617	<	releaseWriteLock(lock, s);
618	<	}
616	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
617	>	public void realRun() throws InterruptedException {
618	>	long startTime = System.nanoTime();
619	>	assertEquals(0L, lock.tryReadLock(timeoutMillis(), MILLISECONDS));
620	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
621	>	}}));
622	>
623	>	// Read locked
624	>	final StampedLock lock2 = new StampedLock();
625	>	long stamp2 = lock2.readLock();
626	>	assertEquals(0L, lock2.tryWriteLock(0L, DAYS));
627	>	assertEquals(0L, lock2.tryWriteLock(Long.MIN_VALUE, DAYS));
628	>	assertFalse(lock2.asWriteLock().tryLock(0L, DAYS));
629	>	assertFalse(lock2.asWriteLock().tryLock(Long.MIN_VALUE, DAYS));
630
631	<	/**
554	<	* timed tryReadLock times out if write-locked
555	<	*/
556	<	public void testReadTryLock_Timeout() {
557	<	final StampedLock lock = new StampedLock();
558	<	long s = lock.writeLock();
559	<	Thread t = newStartedThread(new CheckedRunnable() {
631	>	futures.add(cachedThreadPool.submit(new CheckedRunnable() {
632		public void realRun() throws InterruptedException {
633		long startTime = System.nanoTime();
634	<	long timeoutMillis = 10;
635	<	long rs = lock.tryReadLock(timeoutMillis, MILLISECONDS);
636	<	assertEquals(rs, 0L);
565	<	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
566	<	}});
634	>	assertEquals(0L, lock2.tryWriteLock(timeoutMillis(), MILLISECONDS));
635	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
636	>	}}));
637
638	<	awaitTermination(t);
639	<	assertTrue(lock.isWriteLocked());
640	<	lock.unlockWrite(s);
638	>	for (Future<?> future : futures)
639	>	assertNull(future.get());
640	>
641	>	releaseWriteLock(lock, stamp);
642	>	releaseReadLock(lock2, stamp2);
643		}
644
645		/**
646	<	* writeLockInterruptibly succeeds if unlocked, else is interruptible
646	>	* writeLockInterruptibly succeeds if unlocked
647		*/
648		public void testWriteLockInterruptibly() throws InterruptedException {
577	–	final CountDownLatch running = new CountDownLatch(1);
649		final StampedLock lock = new StampedLock();
650		long s = lock.writeLockInterruptibly();
580	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
581	–	public void realRun() throws InterruptedException {
582	–	running.countDown();
583	–	lock.writeLockInterruptibly();
584	–	}});
585	–
586	–	running.await();
587	–	waitForThreadToEnterWaitState(t, 100);
588	–	t.interrupt();
651		assertTrue(lock.isWriteLocked());
590	–	awaitTermination(t);
652		releaseWriteLock(lock, s);
653		}
654
655		/**
656	<	* readLockInterruptibly succeeds if lock free else is interruptible
656	>	* readLockInterruptibly succeeds if lock free
657		*/
658		public void testReadLockInterruptibly() throws InterruptedException {
598	–	final CountDownLatch running = new CountDownLatch(1);
659		final StampedLock lock = new StampedLock();
660	<	long s;
661	<	s = lock.readLockInterruptibly();
660	>
661	>	long s = assertValid(lock, lock.readLockInterruptibly());
662	>	assertTrue(lock.isReadLocked());
663		lock.unlockRead(s);
603	–	s = lock.writeLockInterruptibly();
604	–	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
605	–	public void realRun() throws InterruptedException {
606	–	running.countDown();
607	–	lock.readLockInterruptibly();
608	–	}});
664
665	<	running.await();
666	<	waitForThreadToEnterWaitState(t, 100);
667	<	t.interrupt();
613	<	awaitTermination(t);
614	<	releaseWriteLock(lock, s);
665	>	lock.asReadLock().lockInterruptibly();
666	>	assertTrue(lock.isReadLocked());
667	>	lock.asReadLock().unlock();
668		}
669
670		/**
#	Line 643 | Line 696 | public class StampedLockTest extends JSR
696		}
697
698		/**
699	<	* tryOptimisticRead succeeds and validates if unlocked, fails if locked
699	>	* tryOptimisticRead succeeds and validates if unlocked, fails if
700	>	* exclusively locked
701		*/
702		public void testValidateOptimistic() throws InterruptedException {
703		StampedLock lock = new StampedLock();
704	<	long s, p;
705	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
706	<	assertTrue(lock.validate(p));
707	<	assertTrue((s = lock.writeLock()) != 0L);
708	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
709	<	assertTrue(lock.validate(s));
710	<	lock.unlockWrite(s);
711	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
712	<	assertTrue(lock.validate(p));
713	<	assertTrue((s = lock.readLock()) != 0L);
714	<	assertTrue(lock.validate(s));
715	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
716	<	assertTrue(lock.validate(p));
717	<	lock.unlockRead(s);
718	<	assertTrue((s = lock.tryWriteLock()) != 0L);
719	<	assertTrue(lock.validate(s));
720	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
667	<	lock.unlockWrite(s);
668	<	assertTrue((s = lock.tryReadLock()) != 0L);
669	<	assertTrue(lock.validate(s));
670	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
671	<	lock.unlockRead(s);
672	<	assertTrue(lock.validate(p));
673	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
674	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
675	<	assertTrue(lock.validate(s));
676	<	lock.unlockWrite(s);
677	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
678	<	assertTrue(lock.validate(s));
679	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
680	<	lock.unlockRead(s);
681	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
704	>
705	>	assertValid(lock, lock.tryOptimisticRead());
706	>
707	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
708	>	long s = assertValid(lock, writeLocker.apply(lock));
709	>	assertEquals(0L, lock.tryOptimisticRead());
710	>	releaseWriteLock(lock, s);
711	>	}
712	>
713	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
714	>	long s = assertValid(lock, readLocker.apply(lock));
715	>	long p = assertValid(lock, lock.tryOptimisticRead());
716	>	releaseReadLock(lock, s);
717	>	assertTrue(lock.validate(p));
718	>	}
719	>
720	>	assertValid(lock, lock.tryOptimisticRead());
721		}
722
723		/**
724		* tryOptimisticRead stamp does not validate if a write lock intervenes
725		*/
726		public void testValidateOptimisticWriteLocked() {
727	<	StampedLock lock = new StampedLock();
728	<	long s, p;
729	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
691	<	assertTrue((s = lock.writeLock()) != 0L);
727	>	final StampedLock lock = new StampedLock();
728	>	final long p = assertValid(lock, lock.tryOptimisticRead());
729	>	final long s = assertValid(lock, lock.writeLock());
730		assertFalse(lock.validate(p));
731	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
731	>	assertEquals(0L, lock.tryOptimisticRead());
732		assertTrue(lock.validate(s));
733		lock.unlockWrite(s);
734		}
#	Line 703 | Line 741 | public class StampedLockTest extends JSR
741		throws InterruptedException {
742		final CountDownLatch running = new CountDownLatch(1);
743		final StampedLock lock = new StampedLock();
744	<	long s, p;
745	<	assertTrue((p = lock.tryOptimisticRead()) != 0L);
744	>	final long p = assertValid(lock, lock.tryOptimisticRead());
745	>
746		Thread t = newStartedThread(new CheckedInterruptedRunnable() {
747		public void realRun() throws InterruptedException {
748		lock.writeLockInterruptibly();
#	Line 714 | Line 752 | public class StampedLockTest extends JSR
752
753		running.await();
754		assertFalse(lock.validate(p));
755	<	assertFalse((p = lock.tryOptimisticRead()) != 0L);
755	>	assertEquals(0L, lock.tryOptimisticRead());
756		t.interrupt();
757		awaitTermination(t);
758		}
759
760		/**
761	<	* tryConvertToOptimisticRead succeeds and validates if successfully locked,
761	>	* tryConvertToOptimisticRead succeeds and validates if successfully locked
762		*/
763		public void testTryConvertToOptimisticRead() throws InterruptedException {
764		StampedLock lock = new StampedLock();
765	<	long s, p;
765	>	long s, p, q;
766		assertEquals(0L, lock.tryConvertToOptimisticRead(0L));
767
768	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
731	<	assertEquals(s, lock.tryConvertToOptimisticRead(s));
732	<	assertTrue(lock.validate(s));
733	<
734	<	assertTrue((p = lock.readLock()) != 0L);
735	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
768	>	s = assertValid(lock, lock.tryOptimisticRead());
769		assertEquals(s, lock.tryConvertToOptimisticRead(s));
770		assertTrue(lock.validate(s));
738	–	lock.unlockRead(p);
739	–
740	–	assertTrue((s = lock.writeLock()) != 0L);
741	–	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
742	–	assertTrue(lock.validate(p));
743	–
744	–	assertTrue((s = lock.readLock()) != 0L);
745	–	assertTrue(lock.validate(s));
746	–	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
747	–	assertTrue(lock.validate(p));
748	–
749	–	assertTrue((s = lock.tryWriteLock()) != 0L);
750	–	assertTrue(lock.validate(s));
751	–	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
752	–	assertTrue(lock.validate(p));
771
772	<	assertTrue((s = lock.tryReadLock()) != 0L);
773	<	assertTrue(lock.validate(s));
774	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
775	<	assertTrue(lock.validate(p));
776	<
777	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
778	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
761	<	assertTrue(lock.validate(p));
772	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
773	>	s = assertValid(lock, writeLocker.apply(lock));
774	>	p = assertValid(lock, lock.tryConvertToOptimisticRead(s));
775	>	assertFalse(lock.validate(s));
776	>	assertTrue(lock.validate(p));
777	>	assertUnlocked(lock);
778	>	}
779
780	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
781	<	assertTrue(lock.validate(s));
782	<	assertTrue((p = lock.tryConvertToOptimisticRead(s)) != 0L);
783	<	assertTrue(lock.validate(p));
780	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
781	>	s = assertValid(lock, readLocker.apply(lock));
782	>	q = assertValid(lock, lock.tryOptimisticRead());
783	>	assertEquals(q, lock.tryConvertToOptimisticRead(q));
784	>	assertTrue(lock.validate(q));
785	>	assertTrue(lock.isReadLocked());
786	>	p = assertValid(lock, lock.tryConvertToOptimisticRead(s));
787	>	assertTrue(lock.validate(p));
788	>	assertTrue(lock.validate(s));
789	>	assertUnlocked(lock);
790	>	assertEquals(q, lock.tryConvertToOptimisticRead(q));
791	>	assertTrue(lock.validate(q));
792	>	}
793		}
794
795		/**
796	<	* tryConvertToReadLock succeeds and validates if successfully locked
771	<	* or lock free;
796	>	* tryConvertToReadLock succeeds for valid stamps
797		*/
798		public void testTryConvertToReadLock() throws InterruptedException {
799		StampedLock lock = new StampedLock();
800		long s, p;
801
802	<	assertFalse((p = lock.tryConvertToReadLock(0L)) != 0L);
802	>	assertEquals(0L, lock.tryConvertToReadLock(0L));
803
804	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
805	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
804	>	s = assertValid(lock, lock.tryOptimisticRead());
805	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
806		assertTrue(lock.isReadLocked());
807		assertEquals(1, lock.getReadLockCount());
808	+	assertTrue(lock.validate(s));
809		lock.unlockRead(p);
810
811	<	assertTrue((s = lock.tryOptimisticRead()) != 0L);
811	>	s = assertValid(lock, lock.tryOptimisticRead());
812		lock.readLock();
813	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
813	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
814		assertTrue(lock.isReadLocked());
815		assertEquals(2, lock.getReadLockCount());
816		lock.unlockRead(p);
817		lock.unlockRead(p);
818	+	assertUnlocked(lock);
819
820	<	assertTrue((s = lock.writeLock()) != 0L);
821	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
822	<	assertTrue(lock.validate(p));
823	<	assertTrue(lock.isReadLocked());
824	<	assertEquals(1, lock.getReadLockCount());
825	<	lock.unlockRead(p);
826	<
827	<	assertTrue((s = lock.readLock()) != 0L);
828	<	assertTrue(lock.validate(s));
829	<	assertEquals(s, lock.tryConvertToReadLock(s));
830	<	assertTrue(lock.validate(s));
831	<	assertTrue(lock.isReadLocked());
832	<	assertEquals(1, lock.getReadLockCount());
833	<	lock.unlockRead(s);
834	<
835	<	assertTrue((s = lock.tryWriteLock()) != 0L);
836	<	assertTrue(lock.validate(s));
837	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
838	<	assertTrue(lock.validate(p));
812	<	assertEquals(1, lock.getReadLockCount());
813	<	lock.unlockRead(p);
814	<
815	<	assertTrue((s = lock.tryReadLock()) != 0L);
816	<	assertTrue(lock.validate(s));
817	<	assertEquals(s, lock.tryConvertToReadLock(s));
818	<	assertTrue(lock.validate(s));
819	<	assertTrue(lock.isReadLocked());
820	<	assertEquals(1, lock.getReadLockCount());
821	<	lock.unlockRead(s);
822	<
823	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
824	<	assertTrue((p = lock.tryConvertToReadLock(s)) != 0L);
825	<	assertTrue(lock.validate(p));
826	<	assertTrue(lock.isReadLocked());
827	<	assertEquals(1, lock.getReadLockCount());
828	<	lock.unlockRead(p);
829	<
830	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
831	<	assertTrue(lock.validate(s));
832	<	assertEquals(s, lock.tryConvertToReadLock(s));
833	<	assertTrue(lock.validate(s));
834	<	assertTrue(lock.isReadLocked());
835	<	assertEquals(1, lock.getReadLockCount());
836	<	lock.unlockRead(s);
820	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
821	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
822	>	s = assertValid(lock, writeLocker.apply(lock));
823	>	p = assertValid(lock, lock.tryConvertToReadLock(s));
824	>	assertFalse(lock.validate(s));
825	>	assertTrue(lock.isReadLocked());
826	>	assertEquals(1, lock.getReadLockCount());
827	>	readUnlocker.accept(lock, p);
828	>	}
829	>
830	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
831	>	s = assertValid(lock, readLocker.apply(lock));
832	>	assertEquals(s, lock.tryConvertToReadLock(s));
833	>	assertTrue(lock.validate(s));
834	>	assertTrue(lock.isReadLocked());
835	>	assertEquals(1, lock.getReadLockCount());
836	>	readUnlocker.accept(lock, s);
837	>	}
838	>	}
839		}
840
841		/**
842	<	* tryConvertToWriteLock succeeds and validates if successfully locked
841	<	* or lock free;
842	>	* tryConvertToWriteLock succeeds if lock available; fails if multiply read locked
843		*/
844		public void testTryConvertToWriteLock() throws InterruptedException {
845		StampedLock lock = new StampedLock();
846		long s, p;
847
848	<	assertFalse((p = lock.tryConvertToWriteLock(0L)) != 0L);
848	>	assertEquals(0L, lock.tryConvertToWriteLock(0L));
849
850		assertTrue((s = lock.tryOptimisticRead()) != 0L);
851		assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
852		assertTrue(lock.isWriteLocked());
853		lock.unlockWrite(p);
854
855	<	assertTrue((s = lock.writeLock()) != 0L);
856	<	assertEquals(s, lock.tryConvertToWriteLock(s));
857	<	assertTrue(lock.validate(s));
858	<	assertTrue(lock.isWriteLocked());
859	<	lock.unlockWrite(s);
860	<
861	<	assertTrue((s = lock.readLock()) != 0L);
862	<	assertTrue(lock.validate(s));
863	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
864	<	assertTrue(lock.validate(p));
865	<	assertTrue(lock.isWriteLocked());
866	<	lock.unlockWrite(p);
867	<
868	<	assertTrue((s = lock.tryWriteLock()) != 0L);
869	<	assertTrue(lock.validate(s));
870	<	assertEquals(s, lock.tryConvertToWriteLock(s));
871	<	assertTrue(lock.validate(s));
872	<	assertTrue(lock.isWriteLocked());
872	<	lock.unlockWrite(s);
873	<
874	<	assertTrue((s = lock.tryReadLock()) != 0L);
875	<	assertTrue(lock.validate(s));
876	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
877	<	assertTrue(lock.validate(p));
878	<	assertTrue(lock.isWriteLocked());
879	<	lock.unlockWrite(p);
880	<
881	<	assertTrue((s = lock.tryWriteLock(100L, MILLISECONDS)) != 0L);
882	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
883	<	assertTrue(lock.validate(p));
884	<	assertTrue(lock.isWriteLocked());
885	<	lock.unlockWrite(p);
855	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
856	>	for (Function<StampedLock, Long> writeLocker : writeLockers()) {
857	>	s = assertValid(lock, writeLocker.apply(lock));
858	>	assertEquals(s, lock.tryConvertToWriteLock(s));
859	>	assertTrue(lock.validate(s));
860	>	assertTrue(lock.isWriteLocked());
861	>	writeUnlocker.accept(lock, s);
862	>	}
863	>
864	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
865	>	s = assertValid(lock, readLocker.apply(lock));
866	>	p = assertValid(lock, lock.tryConvertToWriteLock(s));
867	>	assertFalse(lock.validate(s));
868	>	assertTrue(lock.validate(p));
869	>	assertTrue(lock.isWriteLocked());
870	>	writeUnlocker.accept(lock, p);
871	>	}
872	>	}
873
874	<	assertTrue((s = lock.tryReadLock(100L, MILLISECONDS)) != 0L);
875	<	assertTrue(lock.validate(s));
876	<	assertTrue((p = lock.tryConvertToWriteLock(s)) != 0L);
877	<	assertTrue(lock.validate(p));
878	<	assertTrue(lock.isWriteLocked());
879	<	lock.unlockWrite(p);
874	>	// failure if multiply read locked
875	>	for (Function<StampedLock, Long> readLocker : readLockers()) {
876	>	s = assertValid(lock, readLocker.apply(lock));
877	>	p = assertValid(lock, readLocker.apply(lock));
878	>	assertEquals(0L, lock.tryConvertToWriteLock(s));
879	>	assertTrue(lock.validate(s));
880	>	assertTrue(lock.validate(p));
881	>	assertEquals(2, lock.getReadLockCount());
882	>	lock.unlock(p);
883	>	lock.unlock(s);
884	>	assertUnlocked(lock);
885	>	}
886		}
887
888		/**
889		* asWriteLock can be locked and unlocked
890		*/
891	<	public void testAsWriteLock() {
891	>	public void testAsWriteLock() throws Throwable {
892		StampedLock sl = new StampedLock();
893		Lock lock = sl.asWriteLock();
894	<	lock.lock();
895	<	assertFalse(lock.tryLock());
896	<	lock.unlock();
897	<	assertTrue(lock.tryLock());
894	>	for (Action locker : lockLockers(lock)) {
895	>	locker.run();
896	>	assertTrue(sl.isWriteLocked());
897	>	assertFalse(sl.isReadLocked());
898	>	assertFalse(lock.tryLock());
899	>	lock.unlock();
900	>	assertUnlocked(sl);
901	>	}
902		}
903
904		/**
905		* asReadLock can be locked and unlocked
906		*/
907	<	public void testAsReadLock() {
907	>	public void testAsReadLock() throws Throwable {
908		StampedLock sl = new StampedLock();
909		Lock lock = sl.asReadLock();
910	<	lock.lock();
911	<	lock.unlock();
912	<	assertTrue(lock.tryLock());
910	>	for (Action locker : lockLockers(lock)) {
911	>	locker.run();
912	>	assertTrue(sl.isReadLocked());
913	>	assertFalse(sl.isWriteLocked());
914	>	assertEquals(1, sl.getReadLockCount());
915	>	locker.run();
916	>	assertTrue(sl.isReadLocked());
917	>	assertEquals(2, sl.getReadLockCount());
918	>	lock.unlock();
919	>	lock.unlock();
920	>	assertUnlocked(sl);
921	>	}
922		}
923
924		/**
925		* asReadWriteLock.writeLock can be locked and unlocked
926		*/
927	<	public void testAsReadWriteLockWriteLock() {
927	>	public void testAsReadWriteLockWriteLock() throws Throwable {
928		StampedLock sl = new StampedLock();
929		Lock lock = sl.asReadWriteLock().writeLock();
930	<	lock.lock();
931	<	assertFalse(lock.tryLock());
932	<	lock.unlock();
933	<	assertTrue(lock.tryLock());
930	>	for (Action locker : lockLockers(lock)) {
931	>	locker.run();
932	>	assertTrue(sl.isWriteLocked());
933	>	assertFalse(sl.isReadLocked());
934	>	assertFalse(lock.tryLock());
935	>	lock.unlock();
936	>	assertUnlocked(sl);
937	>	}
938		}
939
940		/**
941		* asReadWriteLock.readLock can be locked and unlocked
942		*/
943	<	public void testAsReadWriteLockReadLock() {
943	>	public void testAsReadWriteLockReadLock() throws Throwable {
944		StampedLock sl = new StampedLock();
945		Lock lock = sl.asReadWriteLock().readLock();
946	<	lock.lock();
947	<	lock.unlock();
948	<	assertTrue(lock.tryLock());
946	>	for (Action locker : lockLockers(lock)) {
947	>	locker.run();
948	>	assertTrue(sl.isReadLocked());
949	>	assertFalse(sl.isWriteLocked());
950	>	assertEquals(1, sl.getReadLockCount());
951	>	locker.run();
952	>	assertTrue(sl.isReadLocked());
953	>	assertEquals(2, sl.getReadLockCount());
954	>	lock.unlock();
955	>	lock.unlock();
956	>	assertUnlocked(sl);
957	>	}
958		}
959
960		/**
#	Line 958 | Line 977 | public class StampedLockTest extends JSR
977		Runnable[] actions = {
978		() -> {
979		StampedLock sl = new StampedLock();
980	<	long stamp = sl.tryOptimisticRead();
962	<	assertTrue(stamp != 0);
980	>	long stamp = assertValid(sl, sl.tryOptimisticRead());
981		sl.unlockRead(stamp);
982		},
983		() -> {
#	Line 976 | Line 994 | public class StampedLockTest extends JSR
994		},
995		() -> {
996		StampedLock sl = new StampedLock();
979	–	long stamp = sl.tryOptimisticRead();
997		sl.readLock();
998	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
999		sl.unlockRead(stamp);
1000		},
1001		() -> {
1002		StampedLock sl = new StampedLock();
985	–	long stamp = sl.tryOptimisticRead();
1003		sl.readLock();
1004	+	long stamp = assertValid(sl, sl.tryOptimisticRead());
1005		sl.unlock(stamp);
1006		},
1007
1008		() -> {
1009		StampedLock sl = new StampedLock();
1010		long stamp = sl.tryConvertToOptimisticRead(sl.writeLock());
1011	<	assertTrue(stamp != 0);
1011	>	assertValid(sl, stamp);
1012		sl.writeLock();
1013		sl.unlockWrite(stamp);
1014		},
#	Line 1016 | Line 1034 | public class StampedLockTest extends JSR
1034		() -> {
1035		StampedLock sl = new StampedLock();
1036		long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1037	<	assertTrue(stamp != 0);
1037	>	assertValid(sl, stamp);
1038		sl.writeLock();
1039		sl.unlockWrite(stamp);
1040		},
#	Line 1036 | Line 1054 | public class StampedLockTest extends JSR
1054		StampedLock sl = new StampedLock();
1055		sl.readLock();
1056		long stamp = sl.tryConvertToOptimisticRead(sl.readLock());
1057	<	assertTrue(stamp != 0);
1057	>	assertValid(sl, stamp);
1058		sl.readLock();
1059		sl.unlockRead(stamp);
1060		},
#	Line 1079 | Line 1097 | public class StampedLockTest extends JSR
1097		}
1098
1099		/**
1100	<	* Invalid write stamps result in IllegalMonitorStateException
1100	>	* Invalid stamps result in IllegalMonitorStateException
1101		*/
1102	<	public void testInvalidWriteStampsThrowIllegalMonitorStateException() {
1103	<	List<Function<StampedLock, Long>> writeLockers = new ArrayList<>();
1086	<	writeLockers.add((sl) -> sl.writeLock());
1087	<	writeLockers.add((sl) -> writeLockInterruptiblyUninterrupted(sl));
1088	<	writeLockers.add((sl) -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
1089	<	writeLockers.add((sl) -> tryWriteLockUninterrupted(sl, 0, DAYS));
1102	>	public void testInvalidStampsThrowIllegalMonitorStateException() {
1103	>	final StampedLock sl = new StampedLock();
1104
1105	<	List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>();
1106	<	writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp));
1107	<	writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite()));
1108	<	writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock());
1109	<	writeUnlockers.add((sl, stamp) -> sl.unlock(stamp));
1105	>	assertThrows(IllegalMonitorStateException.class,
1106	>	() -> sl.unlockWrite(0L),
1107	>	() -> sl.unlockRead(0L),
1108	>	() -> sl.unlock(0L));
1109	>
1110	>	final long optimisticStamp = sl.tryOptimisticRead();
1111	>	final long readStamp = sl.readLock();
1112	>	sl.unlockRead(readStamp);
1113	>	final long writeStamp = sl.writeLock();
1114	>	sl.unlockWrite(writeStamp);
1115	>	assertTrue(optimisticStamp != 0L && readStamp != 0L && writeStamp != 0L);
1116	>	final long[] noLongerValidStamps = { optimisticStamp, readStamp, writeStamp };
1117	>	final Runnable assertNoLongerValidStampsThrow = () -> {
1118	>	for (long noLongerValidStamp : noLongerValidStamps)
1119	>	assertThrows(IllegalMonitorStateException.class,
1120	>	() -> sl.unlockWrite(noLongerValidStamp),
1121	>	() -> sl.unlockRead(noLongerValidStamp),
1122	>	() -> sl.unlock(noLongerValidStamp));
1123	>	};
1124	>	assertNoLongerValidStampsThrow.run();
1125
1126	<	List<Consumer<StampedLock>> mutaters = new ArrayList<>();
1127	<	mutaters.add((sl) -> {});
1128	<	mutaters.add((sl) -> sl.readLock());
1129	<	for (Function<StampedLock, Long> writeLocker : writeLockers)
1130	<	mutaters.add((sl) -> writeLocker.apply(sl));
1102	<
1103	<	for (Function<StampedLock, Long> writeLocker : writeLockers)
1104	<	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers)
1105	<	for (Consumer<StampedLock> mutater : mutaters) {
1106	<	final StampedLock sl = new StampedLock();
1107	<	final long stamp = writeLocker.apply(sl);
1108	<	assertTrue(stamp != 0L);
1126	>	for (Function<StampedLock, Long> readLocker : readLockers())
1127	>	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers()) {
1128	>	final long stamp = readLocker.apply(sl);
1129	>	assertValid(sl, stamp);
1130	>	assertNoLongerValidStampsThrow.run();
1131		assertThrows(IllegalMonitorStateException.class,
1132	<	() -> sl.unlockRead(stamp));
1133	<	writeUnlocker.accept(sl, stamp);
1134	<	mutater.accept(sl);
1132	>	() -> sl.unlockWrite(stamp),
1133	>	() -> sl.unlockRead(sl.tryOptimisticRead()),
1134	>	() -> sl.unlockRead(0L));
1135	>	readUnlocker.accept(sl, stamp);
1136	>	assertUnlocked(sl);
1137	>	assertNoLongerValidStampsThrow.run();
1138	>	}
1139	>
1140	>	for (Function<StampedLock, Long> writeLocker : writeLockers())
1141	>	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers()) {
1142	>	final long stamp = writeLocker.apply(sl);
1143	>	assertValid(sl, stamp);
1144	>	assertNoLongerValidStampsThrow.run();
1145		assertThrows(IllegalMonitorStateException.class,
1114	–	() -> sl.unlock(stamp),
1146		() -> sl.unlockRead(stamp),
1147	<	() -> sl.unlockWrite(stamp));
1147	>	() -> sl.unlockWrite(0L));
1148	>	writeUnlocker.accept(sl, stamp);
1149	>	assertUnlocked(sl);
1150	>	assertNoLongerValidStampsThrow.run();
1151		}
1152		}
1153
1154		/**
1155	<	* Invalid read stamps result in IllegalMonitorStateException
1155	>	* Read locks can be very deeply nested
1156		*/
1157	<	public void testInvalidReadStampsThrowIllegalMonitorStateException() {
1158	<	List<Function<StampedLock, Long>> readLockers = new ArrayList<>();
1159	<	readLockers.add((sl) -> sl.readLock());
1160	<	readLockers.add((sl) -> readLockInterruptiblyUninterrupted(sl));
1161	<	readLockers.add((sl) -> tryReadLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
1162	<	readLockers.add((sl) -> tryReadLockUninterrupted(sl, 0, DAYS));
1163	<
1164	<	List<BiConsumer<StampedLock, Long>> readUnlockers = new ArrayList<>();
1165	<	readUnlockers.add((sl, stamp) -> sl.unlockRead(stamp));
1166	<	readUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockRead()));
1167	<	readUnlockers.add((sl, stamp) -> sl.asReadLock().unlock());
1168	<	readUnlockers.add((sl, stamp) -> sl.unlock(stamp));
1169	<
1170	<	List<Function<StampedLock, Long>> writeLockers = new ArrayList<>();
1171	<	writeLockers.add((sl) -> sl.writeLock());
1172	<	writeLockers.add((sl) -> writeLockInterruptiblyUninterrupted(sl));
1173	<	writeLockers.add((sl) -> tryWriteLockUninterrupted(sl, Long.MIN_VALUE, DAYS));
1174	<	writeLockers.add((sl) -> tryWriteLockUninterrupted(sl, 0, DAYS));
1175	<
1176	<	List<BiConsumer<StampedLock, Long>> writeUnlockers = new ArrayList<>();
1143	<	writeUnlockers.add((sl, stamp) -> sl.unlockWrite(stamp));
1144	<	writeUnlockers.add((sl, stamp) -> assertTrue(sl.tryUnlockWrite()));
1145	<	writeUnlockers.add((sl, stamp) -> sl.asWriteLock().unlock());
1146	<	writeUnlockers.add((sl, stamp) -> sl.unlock(stamp));
1147	<
1148	<
1149	<	for (Function<StampedLock, Long> readLocker : readLockers)
1150	<	for (BiConsumer<StampedLock, Long> readUnlocker : readUnlockers)
1151	<	for (Function<StampedLock, Long> writeLocker : writeLockers)
1152	<	for (BiConsumer<StampedLock, Long> writeUnlocker : writeUnlockers) {
1153	<	final StampedLock sl = new StampedLock();
1154	<	final long stamp = readLocker.apply(sl);
1155	<	assertTrue(stamp != 0L);
1156	<	assertThrows(IllegalMonitorStateException.class,
1157	<	() -> sl.unlockWrite(stamp));
1158	<	readUnlocker.accept(sl, stamp);
1159	<	assertThrows(IllegalMonitorStateException.class,
1160	<	() -> sl.unlock(stamp),
1161	<	() -> sl.unlockRead(stamp),
1162	<	() -> sl.unlockWrite(stamp));
1163	<	final long writeStamp = writeLocker.apply(sl);
1164	<	assertTrue(writeStamp != 0L);
1165	<	assertTrue(writeStamp != stamp);
1166	<	assertThrows(IllegalMonitorStateException.class,
1167	<	() -> sl.unlock(stamp),
1168	<	() -> sl.unlockRead(stamp),
1169	<	() -> sl.unlockWrite(stamp));
1170	<	writeUnlocker.accept(sl, writeStamp);
1171	<	assertThrows(IllegalMonitorStateException.class,
1172	<	() -> sl.unlock(stamp),
1173	<	() -> sl.unlockRead(stamp),
1174	<	() -> sl.unlockWrite(stamp));
1157	>	public void testDeeplyNestedReadLocks() {
1158	>	final StampedLock lock = new StampedLock();
1159	>	final int depth = 300;
1160	>	final long[] stamps = new long[depth];
1161	>	final List<Function<StampedLock, Long>> readLockers = readLockers();
1162	>	final List<BiConsumer<StampedLock, Long>> readUnlockers = readUnlockers();
1163	>	for (int i = 0; i < depth; i++) {
1164	>	Function<StampedLock, Long> readLocker
1165	>	= readLockers.get(i % readLockers.size());
1166	>	long stamp = readLocker.apply(lock);
1167	>	assertEquals(i + 1, lock.getReadLockCount());
1168	>	assertTrue(lock.isReadLocked());
1169	>	stamps[i] = stamp;
1170	>	}
1171	>	for (int i = 0; i < depth; i++) {
1172	>	BiConsumer<StampedLock, Long> readUnlocker
1173	>	= readUnlockers.get(i % readUnlockers.size());
1174	>	assertEquals(depth - i, lock.getReadLockCount());
1175	>	assertTrue(lock.isReadLocked());
1176	>	readUnlocker.accept(lock, stamps[depth - 1 - i]);
1177		}
1178	+	assertUnlocked(lock);
1179		}
1177	–
1180		}

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