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Comparing jsr166/src/test/tck/ReentrantReadWriteLockTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:55 2003 UTC vs.
Revision 1.81 by jsr166, Mon Jul 17 21:01:30 2017 UTC

# Line 1 | Line 1
1   /*
2 < * Written by members of JCP JSR-166 Expert Group and released to the
3 < * public domain. Use, modify, and redistribute this code in any way
4 < * without acknowledgement. Other contributors include Andrew Wright,
5 < * Jeffrey Hayes, Pat Fischer, Mike Judd.
2 > * Written by Doug Lea with assistance from members of JCP JSR-166
3 > * Expert Group and released to the public domain, as explained at
4 > * http://creativecommons.org/publicdomain/zero/1.0/
5 > * Other contributors include Andrew Wright, Jeffrey Hayes,
6 > * Pat Fisher, Mike Judd.
7   */
8  
9 < import junit.framework.*;
10 < import java.util.concurrent.locks.*;
11 < import java.util.concurrent.*;
12 <
13 < public class ReentrantReadWriteLockTest extends TestCase {
14 <    static int HOLD_COUNT_TEST_LIMIT = 20;
15 <    
9 > import static java.util.concurrent.TimeUnit.MILLISECONDS;
10 >
11 > import java.util.Arrays;
12 > import java.util.Collection;
13 > import java.util.HashSet;
14 > import java.util.concurrent.CountDownLatch;
15 > import java.util.concurrent.atomic.AtomicBoolean;
16 > import java.util.concurrent.locks.Condition;
17 > import java.util.concurrent.locks.Lock;
18 > import java.util.concurrent.locks.ReentrantReadWriteLock;
19 >
20 > import junit.framework.AssertionFailedError;
21 > import junit.framework.Test;
22 > import junit.framework.TestSuite;
23 >
24 > @SuppressWarnings("WaitNotInLoop") // we implement spurious-wakeup freedom
25 > public class ReentrantReadWriteLockTest extends JSR166TestCase {
26      public static void main(String[] args) {
27 <        junit.textui.TestRunner.run (suite());  
27 >        main(suite(), args);
28      }
18    
29      public static Test suite() {
30 <        return new TestSuite(ReentrantReadWriteLockTest.class);
30 >        return new TestSuite(ReentrantReadWriteLockTest.class);
31 >    }
32 >
33 >    /**
34 >     * A runnable calling lockInterruptibly
35 >     */
36 >    class InterruptibleLockRunnable extends CheckedRunnable {
37 >        final ReentrantReadWriteLock lock;
38 >        InterruptibleLockRunnable(ReentrantReadWriteLock l) { lock = l; }
39 >        public void realRun() throws InterruptedException {
40 >            lock.writeLock().lockInterruptibly();
41 >        }
42 >    }
43 >
44 >    /**
45 >     * A runnable calling lockInterruptibly that expects to be
46 >     * interrupted
47 >     */
48 >    class InterruptedLockRunnable extends CheckedInterruptedRunnable {
49 >        final ReentrantReadWriteLock lock;
50 >        InterruptedLockRunnable(ReentrantReadWriteLock l) { lock = l; }
51 >        public void realRun() throws InterruptedException {
52 >            lock.writeLock().lockInterruptibly();
53 >        }
54 >    }
55 >
56 >    /**
57 >     * Subclass to expose protected methods
58 >     */
59 >    static class PublicReentrantReadWriteLock extends ReentrantReadWriteLock {
60 >        PublicReentrantReadWriteLock() { super(); }
61 >        PublicReentrantReadWriteLock(boolean fair) { super(fair); }
62 >        public Thread getOwner() {
63 >            return super.getOwner();
64 >        }
65 >        public Collection<Thread> getQueuedThreads() {
66 >            return super.getQueuedThreads();
67 >        }
68 >        public Collection<Thread> getWaitingThreads(Condition c) {
69 >            return super.getWaitingThreads(c);
70 >        }
71 >    }
72 >
73 >    /**
74 >     * Releases write lock, checking that it had a hold count of 1.
75 >     */
76 >    void releaseWriteLock(PublicReentrantReadWriteLock lock) {
77 >        ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
78 >        assertWriteLockedByMoi(lock);
79 >        assertEquals(1, lock.getWriteHoldCount());
80 >        writeLock.unlock();
81 >        assertNotWriteLocked(lock);
82 >    }
83 >
84 >    /**
85 >     * Spin-waits until lock.hasQueuedThread(t) becomes true.
86 >     */
87 >    void waitForQueuedThread(PublicReentrantReadWriteLock lock, Thread t) {
88 >        long startTime = System.nanoTime();
89 >        while (!lock.hasQueuedThread(t)) {
90 >            if (millisElapsedSince(startTime) > LONG_DELAY_MS)
91 >                throw new AssertionFailedError("timed out");
92 >            Thread.yield();
93 >        }
94 >        assertTrue(t.isAlive());
95 >        assertNotSame(t, lock.getOwner());
96 >    }
97 >
98 >    /**
99 >     * Checks that lock is not write-locked.
100 >     */
101 >    void assertNotWriteLocked(PublicReentrantReadWriteLock lock) {
102 >        assertFalse(lock.isWriteLocked());
103 >        assertFalse(lock.isWriteLockedByCurrentThread());
104 >        assertFalse(lock.writeLock().isHeldByCurrentThread());
105 >        assertEquals(0, lock.getWriteHoldCount());
106 >        assertEquals(0, lock.writeLock().getHoldCount());
107 >        assertNull(lock.getOwner());
108 >    }
109 >
110 >    /**
111 >     * Checks that lock is write-locked by the given thread.
112 >     */
113 >    void assertWriteLockedBy(PublicReentrantReadWriteLock lock, Thread t) {
114 >        assertTrue(lock.isWriteLocked());
115 >        assertSame(t, lock.getOwner());
116 >        assertEquals(t == Thread.currentThread(),
117 >                     lock.isWriteLockedByCurrentThread());
118 >        assertEquals(t == Thread.currentThread(),
119 >                     lock.writeLock().isHeldByCurrentThread());
120 >        assertEquals(t == Thread.currentThread(),
121 >                     lock.getWriteHoldCount() > 0);
122 >        assertEquals(t == Thread.currentThread(),
123 >                     lock.writeLock().getHoldCount() > 0);
124 >        assertEquals(0, lock.getReadLockCount());
125 >    }
126 >
127 >    /**
128 >     * Checks that lock is write-locked by the current thread.
129 >     */
130 >    void assertWriteLockedByMoi(PublicReentrantReadWriteLock lock) {
131 >        assertWriteLockedBy(lock, Thread.currentThread());
132 >    }
133 >
134 >    /**
135 >     * Checks that condition c has no waiters.
136 >     */
137 >    void assertHasNoWaiters(PublicReentrantReadWriteLock lock, Condition c) {
138 >        assertHasWaiters(lock, c, new Thread[] {});
139 >    }
140 >
141 >    /**
142 >     * Checks that condition c has exactly the given waiter threads.
143 >     */
144 >    void assertHasWaiters(PublicReentrantReadWriteLock lock, Condition c,
145 >                          Thread... threads) {
146 >        lock.writeLock().lock();
147 >        assertEquals(threads.length > 0, lock.hasWaiters(c));
148 >        assertEquals(threads.length, lock.getWaitQueueLength(c));
149 >        assertEquals(threads.length == 0, lock.getWaitingThreads(c).isEmpty());
150 >        assertEquals(threads.length, lock.getWaitingThreads(c).size());
151 >        assertEquals(new HashSet<Thread>(lock.getWaitingThreads(c)),
152 >                     new HashSet<Thread>(Arrays.asList(threads)));
153 >        lock.writeLock().unlock();
154 >    }
155 >
156 >    enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }
157 >
158 >    /**
159 >     * Awaits condition "indefinitely" using the specified AwaitMethod.
160 >     */
161 >    void await(Condition c, AwaitMethod awaitMethod)
162 >            throws InterruptedException {
163 >        long timeoutMillis = 2 * LONG_DELAY_MS;
164 >        switch (awaitMethod) {
165 >        case await:
166 >            c.await();
167 >            break;
168 >        case awaitTimed:
169 >            assertTrue(c.await(timeoutMillis, MILLISECONDS));
170 >            break;
171 >        case awaitNanos:
172 >            long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
173 >            long nanosRemaining = c.awaitNanos(timeoutNanos);
174 >            assertTrue(nanosRemaining > timeoutNanos / 2);
175 >            assertTrue(nanosRemaining <= timeoutNanos);
176 >            break;
177 >        case awaitUntil:
178 >            assertTrue(c.awaitUntil(delayedDate(timeoutMillis)));
179 >            break;
180 >        default:
181 >            throw new AssertionError();
182 >        }
183 >    }
184 >
185 >    /**
186 >     * Constructor sets given fairness, and is in unlocked state
187 >     */
188 >    public void testConstructor() {
189 >        PublicReentrantReadWriteLock lock;
190 >
191 >        lock = new PublicReentrantReadWriteLock();
192 >        assertFalse(lock.isFair());
193 >        assertNotWriteLocked(lock);
194 >        assertEquals(0, lock.getReadLockCount());
195 >
196 >        lock = new PublicReentrantReadWriteLock(true);
197 >        assertTrue(lock.isFair());
198 >        assertNotWriteLocked(lock);
199 >        assertEquals(0, lock.getReadLockCount());
200 >
201 >        lock = new PublicReentrantReadWriteLock(false);
202 >        assertFalse(lock.isFair());
203 >        assertNotWriteLocked(lock);
204 >        assertEquals(0, lock.getReadLockCount());
205 >    }
206 >
207 >    /**
208 >     * write-locking and read-locking an unlocked lock succeed
209 >     */
210 >    public void testLock()      { testLock(false); }
211 >    public void testLock_fair() { testLock(true); }
212 >    public void testLock(boolean fair) {
213 >        PublicReentrantReadWriteLock lock =
214 >            new PublicReentrantReadWriteLock(fair);
215 >        assertNotWriteLocked(lock);
216 >        lock.writeLock().lock();
217 >        assertWriteLockedByMoi(lock);
218 >        lock.writeLock().unlock();
219 >        assertNotWriteLocked(lock);
220 >        assertEquals(0, lock.getReadLockCount());
221 >        lock.readLock().lock();
222 >        assertNotWriteLocked(lock);
223 >        assertEquals(1, lock.getReadLockCount());
224 >        lock.readLock().unlock();
225 >        assertNotWriteLocked(lock);
226 >        assertEquals(0, lock.getReadLockCount());
227 >    }
228 >
229 >    /**
230 >     * getWriteHoldCount returns number of recursive holds
231 >     */
232 >    public void testGetWriteHoldCount()      { testGetWriteHoldCount(false); }
233 >    public void testGetWriteHoldCount_fair() { testGetWriteHoldCount(true); }
234 >    public void testGetWriteHoldCount(boolean fair) {
235 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
236 >        for (int i = 1; i <= SIZE; i++) {
237 >            lock.writeLock().lock();
238 >            assertEquals(i,lock.getWriteHoldCount());
239 >        }
240 >        for (int i = SIZE; i > 0; i--) {
241 >            lock.writeLock().unlock();
242 >            assertEquals(i - 1,lock.getWriteHoldCount());
243 >        }
244 >    }
245 >
246 >    /**
247 >     * writelock.getHoldCount returns number of recursive holds
248 >     */
249 >    public void testGetHoldCount()      { testGetHoldCount(false); }
250 >    public void testGetHoldCount_fair() { testGetHoldCount(true); }
251 >    public void testGetHoldCount(boolean fair) {
252 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
253 >        for (int i = 1; i <= SIZE; i++) {
254 >            lock.writeLock().lock();
255 >            assertEquals(i,lock.writeLock().getHoldCount());
256 >        }
257 >        for (int i = SIZE; i > 0; i--) {
258 >            lock.writeLock().unlock();
259 >            assertEquals(i - 1,lock.writeLock().getHoldCount());
260 >        }
261 >    }
262 >
263 >    /**
264 >     * getReadHoldCount returns number of recursive holds
265 >     */
266 >    public void testGetReadHoldCount()      { testGetReadHoldCount(false); }
267 >    public void testGetReadHoldCount_fair() { testGetReadHoldCount(true); }
268 >    public void testGetReadHoldCount(boolean fair) {
269 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
270 >        for (int i = 1; i <= SIZE; i++) {
271 >            lock.readLock().lock();
272 >            assertEquals(i,lock.getReadHoldCount());
273 >        }
274 >        for (int i = SIZE; i > 0; i--) {
275 >            lock.readLock().unlock();
276 >            assertEquals(i - 1,lock.getReadHoldCount());
277 >        }
278 >    }
279 >
280 >    /**
281 >     * write-unlocking an unlocked lock throws IllegalMonitorStateException
282 >     */
283 >    public void testWriteUnlock_IMSE()      { testWriteUnlock_IMSE(false); }
284 >    public void testWriteUnlock_IMSE_fair() { testWriteUnlock_IMSE(true); }
285 >    public void testWriteUnlock_IMSE(boolean fair) {
286 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
287 >        try {
288 >            lock.writeLock().unlock();
289 >            shouldThrow();
290 >        } catch (IllegalMonitorStateException success) {}
291 >    }
292 >
293 >    /**
294 >     * read-unlocking an unlocked lock throws IllegalMonitorStateException
295 >     */
296 >    public void testReadUnlock_IMSE()      { testReadUnlock_IMSE(false); }
297 >    public void testReadUnlock_IMSE_fair() { testReadUnlock_IMSE(true); }
298 >    public void testReadUnlock_IMSE(boolean fair) {
299 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
300 >        try {
301 >            lock.readLock().unlock();
302 >            shouldThrow();
303 >        } catch (IllegalMonitorStateException success) {}
304 >    }
305 >
306 >    /**
307 >     * write-lockInterruptibly is interruptible
308 >     */
309 >    public void testWriteLockInterruptibly_Interruptible()      { testWriteLockInterruptibly_Interruptible(false); }
310 >    public void testWriteLockInterruptibly_Interruptible_fair() { testWriteLockInterruptibly_Interruptible(true); }
311 >    public void testWriteLockInterruptibly_Interruptible(boolean fair) {
312 >        final PublicReentrantReadWriteLock lock =
313 >            new PublicReentrantReadWriteLock(fair);
314 >        lock.writeLock().lock();
315 >        Thread t = newStartedThread(new CheckedInterruptedRunnable() {
316 >            public void realRun() throws InterruptedException {
317 >                lock.writeLock().lockInterruptibly();
318 >            }});
319 >
320 >        waitForQueuedThread(lock, t);
321 >        t.interrupt();
322 >        awaitTermination(t);
323 >        releaseWriteLock(lock);
324 >    }
325 >
326 >    /**
327 >     * timed write-tryLock is interruptible
328 >     */
329 >    public void testWriteTryLock_Interruptible()      { testWriteTryLock_Interruptible(false); }
330 >    public void testWriteTryLock_Interruptible_fair() { testWriteTryLock_Interruptible(true); }
331 >    public void testWriteTryLock_Interruptible(boolean fair) {
332 >        final PublicReentrantReadWriteLock lock =
333 >            new PublicReentrantReadWriteLock(fair);
334 >        lock.writeLock().lock();
335 >        Thread t = newStartedThread(new CheckedInterruptedRunnable() {
336 >            public void realRun() throws InterruptedException {
337 >                lock.writeLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
338 >            }});
339 >
340 >        waitForQueuedThread(lock, t);
341 >        t.interrupt();
342 >        awaitTermination(t);
343 >        releaseWriteLock(lock);
344 >    }
345 >
346 >    /**
347 >     * read-lockInterruptibly is interruptible
348 >     */
349 >    public void testReadLockInterruptibly_Interruptible()      { testReadLockInterruptibly_Interruptible(false); }
350 >    public void testReadLockInterruptibly_Interruptible_fair() { testReadLockInterruptibly_Interruptible(true); }
351 >    public void testReadLockInterruptibly_Interruptible(boolean fair) {
352 >        final PublicReentrantReadWriteLock lock =
353 >            new PublicReentrantReadWriteLock(fair);
354 >        lock.writeLock().lock();
355 >        Thread t = newStartedThread(new CheckedInterruptedRunnable() {
356 >            public void realRun() throws InterruptedException {
357 >                lock.readLock().lockInterruptibly();
358 >            }});
359 >
360 >        waitForQueuedThread(lock, t);
361 >        t.interrupt();
362 >        awaitTermination(t);
363 >        releaseWriteLock(lock);
364 >    }
365 >
366 >    /**
367 >     * timed read-tryLock is interruptible
368 >     */
369 >    public void testReadTryLock_Interruptible()      { testReadTryLock_Interruptible(false); }
370 >    public void testReadTryLock_Interruptible_fair() { testReadTryLock_Interruptible(true); }
371 >    public void testReadTryLock_Interruptible(boolean fair) {
372 >        final PublicReentrantReadWriteLock lock =
373 >            new PublicReentrantReadWriteLock(fair);
374 >        lock.writeLock().lock();
375 >        Thread t = newStartedThread(new CheckedInterruptedRunnable() {
376 >            public void realRun() throws InterruptedException {
377 >                lock.readLock().tryLock(2 * LONG_DELAY_MS, MILLISECONDS);
378 >            }});
379 >
380 >        waitForQueuedThread(lock, t);
381 >        t.interrupt();
382 >        awaitTermination(t);
383 >        releaseWriteLock(lock);
384 >    }
385 >
386 >    /**
387 >     * write-tryLock on an unlocked lock succeeds
388 >     */
389 >    public void testWriteTryLock()      { testWriteTryLock(false); }
390 >    public void testWriteTryLock_fair() { testWriteTryLock(true); }
391 >    public void testWriteTryLock(boolean fair) {
392 >        final PublicReentrantReadWriteLock lock =
393 >            new PublicReentrantReadWriteLock(fair);
394 >        assertTrue(lock.writeLock().tryLock());
395 >        assertWriteLockedByMoi(lock);
396 >        assertTrue(lock.writeLock().tryLock());
397 >        assertWriteLockedByMoi(lock);
398 >        lock.writeLock().unlock();
399 >        releaseWriteLock(lock);
400 >    }
401 >
402 >    /**
403 >     * write-tryLock fails if locked
404 >     */
405 >    public void testWriteTryLockWhenLocked()      { testWriteTryLockWhenLocked(false); }
406 >    public void testWriteTryLockWhenLocked_fair() { testWriteTryLockWhenLocked(true); }
407 >    public void testWriteTryLockWhenLocked(boolean fair) {
408 >        final PublicReentrantReadWriteLock lock =
409 >            new PublicReentrantReadWriteLock(fair);
410 >        lock.writeLock().lock();
411 >        Thread t = newStartedThread(new CheckedRunnable() {
412 >            public void realRun() {
413 >                assertFalse(lock.writeLock().tryLock());
414 >            }});
415 >
416 >        awaitTermination(t);
417 >        releaseWriteLock(lock);
418 >    }
419 >
420 >    /**
421 >     * read-tryLock fails if locked
422 >     */
423 >    public void testReadTryLockWhenLocked()      { testReadTryLockWhenLocked(false); }
424 >    public void testReadTryLockWhenLocked_fair() { testReadTryLockWhenLocked(true); }
425 >    public void testReadTryLockWhenLocked(boolean fair) {
426 >        final PublicReentrantReadWriteLock lock =
427 >            new PublicReentrantReadWriteLock(fair);
428 >        lock.writeLock().lock();
429 >        Thread t = newStartedThread(new CheckedRunnable() {
430 >            public void realRun() {
431 >                assertFalse(lock.readLock().tryLock());
432 >            }});
433 >
434 >        awaitTermination(t);
435 >        releaseWriteLock(lock);
436 >    }
437 >
438 >    /**
439 >     * Multiple threads can hold a read lock when not write-locked
440 >     */
441 >    public void testMultipleReadLocks()      { testMultipleReadLocks(false); }
442 >    public void testMultipleReadLocks_fair() { testMultipleReadLocks(true); }
443 >    public void testMultipleReadLocks(boolean fair) {
444 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
445 >        lock.readLock().lock();
446 >        Thread t = newStartedThread(new CheckedRunnable() {
447 >            public void realRun() throws InterruptedException {
448 >                assertTrue(lock.readLock().tryLock());
449 >                lock.readLock().unlock();
450 >                assertTrue(lock.readLock().tryLock(LONG_DELAY_MS, MILLISECONDS));
451 >                lock.readLock().unlock();
452 >                lock.readLock().lock();
453 >                lock.readLock().unlock();
454 >            }});
455 >
456 >        awaitTermination(t);
457 >        lock.readLock().unlock();
458 >    }
459 >
460 >    /**
461 >     * A writelock succeeds only after a reading thread unlocks
462 >     */
463 >    public void testWriteAfterReadLock()      { testWriteAfterReadLock(false); }
464 >    public void testWriteAfterReadLock_fair() { testWriteAfterReadLock(true); }
465 >    public void testWriteAfterReadLock(boolean fair) {
466 >        final PublicReentrantReadWriteLock lock =
467 >            new PublicReentrantReadWriteLock(fair);
468 >        lock.readLock().lock();
469 >        Thread t = newStartedThread(new CheckedRunnable() {
470 >            public void realRun() {
471 >                assertEquals(1, lock.getReadLockCount());
472 >                lock.writeLock().lock();
473 >                assertEquals(0, lock.getReadLockCount());
474 >                lock.writeLock().unlock();
475 >            }});
476 >        waitForQueuedThread(lock, t);
477 >        assertNotWriteLocked(lock);
478 >        assertEquals(1, lock.getReadLockCount());
479 >        lock.readLock().unlock();
480 >        assertEquals(0, lock.getReadLockCount());
481 >        awaitTermination(t);
482 >        assertNotWriteLocked(lock);
483 >    }
484 >
485 >    /**
486 >     * A writelock succeeds only after reading threads unlock
487 >     */
488 >    public void testWriteAfterMultipleReadLocks()      { testWriteAfterMultipleReadLocks(false); }
489 >    public void testWriteAfterMultipleReadLocks_fair() { testWriteAfterMultipleReadLocks(true); }
490 >    public void testWriteAfterMultipleReadLocks(boolean fair) {
491 >        final PublicReentrantReadWriteLock lock =
492 >            new PublicReentrantReadWriteLock(fair);
493 >        lock.readLock().lock();
494 >        lock.readLock().lock();
495 >        Thread t1 = newStartedThread(new CheckedRunnable() {
496 >            public void realRun() {
497 >                lock.readLock().lock();
498 >                assertEquals(3, lock.getReadLockCount());
499 >                lock.readLock().unlock();
500 >            }});
501 >        awaitTermination(t1);
502 >
503 >        Thread t2 = newStartedThread(new CheckedRunnable() {
504 >            public void realRun() {
505 >                assertEquals(2, lock.getReadLockCount());
506 >                lock.writeLock().lock();
507 >                assertEquals(0, lock.getReadLockCount());
508 >                lock.writeLock().unlock();
509 >            }});
510 >        waitForQueuedThread(lock, t2);
511 >        assertNotWriteLocked(lock);
512 >        assertEquals(2, lock.getReadLockCount());
513 >        lock.readLock().unlock();
514 >        lock.readLock().unlock();
515 >        assertEquals(0, lock.getReadLockCount());
516 >        awaitTermination(t2);
517 >        assertNotWriteLocked(lock);
518 >    }
519 >
520 >    /**
521 >     * A thread that tries to acquire a fair read lock (non-reentrantly)
522 >     * will block if there is a waiting writer thread
523 >     */
524 >    public void testReaderWriterReaderFairFifo() {
525 >        final PublicReentrantReadWriteLock lock =
526 >            new PublicReentrantReadWriteLock(true);
527 >        final AtomicBoolean t1GotLock = new AtomicBoolean(false);
528 >
529 >        lock.readLock().lock();
530 >        Thread t1 = newStartedThread(new CheckedRunnable() {
531 >            public void realRun() {
532 >                assertEquals(1, lock.getReadLockCount());
533 >                lock.writeLock().lock();
534 >                assertEquals(0, lock.getReadLockCount());
535 >                t1GotLock.set(true);
536 >                lock.writeLock().unlock();
537 >            }});
538 >        waitForQueuedThread(lock, t1);
539 >
540 >        Thread t2 = newStartedThread(new CheckedRunnable() {
541 >            public void realRun() {
542 >                assertEquals(1, lock.getReadLockCount());
543 >                lock.readLock().lock();
544 >                assertEquals(1, lock.getReadLockCount());
545 >                assertTrue(t1GotLock.get());
546 >                lock.readLock().unlock();
547 >            }});
548 >        waitForQueuedThread(lock, t2);
549 >        assertTrue(t1.isAlive());
550 >        assertNotWriteLocked(lock);
551 >        assertEquals(1, lock.getReadLockCount());
552 >        lock.readLock().unlock();
553 >        awaitTermination(t1);
554 >        awaitTermination(t2);
555 >        assertNotWriteLocked(lock);
556 >    }
557 >
558 >    /**
559 >     * Readlocks succeed only after a writing thread unlocks
560 >     */
561 >    public void testReadAfterWriteLock()      { testReadAfterWriteLock(false); }
562 >    public void testReadAfterWriteLock_fair() { testReadAfterWriteLock(true); }
563 >    public void testReadAfterWriteLock(boolean fair) {
564 >        final PublicReentrantReadWriteLock lock =
565 >            new PublicReentrantReadWriteLock(fair);
566 >        lock.writeLock().lock();
567 >        Thread t1 = newStartedThread(new CheckedRunnable() {
568 >            public void realRun() {
569 >                lock.readLock().lock();
570 >                lock.readLock().unlock();
571 >            }});
572 >        Thread t2 = newStartedThread(new CheckedRunnable() {
573 >            public void realRun() {
574 >                lock.readLock().lock();
575 >                lock.readLock().unlock();
576 >            }});
577 >
578 >        waitForQueuedThread(lock, t1);
579 >        waitForQueuedThread(lock, t2);
580 >        releaseWriteLock(lock);
581 >        awaitTermination(t1);
582 >        awaitTermination(t2);
583 >    }
584 >
585 >    /**
586 >     * Read trylock succeeds if write locked by current thread
587 >     */
588 >    public void testReadHoldingWriteLock()      { testReadHoldingWriteLock(false); }
589 >    public void testReadHoldingWriteLock_fair() { testReadHoldingWriteLock(true); }
590 >    public void testReadHoldingWriteLock(boolean fair) {
591 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
592 >        lock.writeLock().lock();
593 >        assertTrue(lock.readLock().tryLock());
594 >        lock.readLock().unlock();
595 >        lock.writeLock().unlock();
596 >    }
597 >
598 >    /**
599 >     * Read trylock succeeds (barging) even in the presence of waiting
600 >     * readers and/or writers
601 >     */
602 >    public void testReadTryLockBarging()      { testReadTryLockBarging(false); }
603 >    public void testReadTryLockBarging_fair() { testReadTryLockBarging(true); }
604 >    public void testReadTryLockBarging(boolean fair) {
605 >        final PublicReentrantReadWriteLock lock =
606 >            new PublicReentrantReadWriteLock(fair);
607 >        lock.readLock().lock();
608 >
609 >        Thread t1 = newStartedThread(new CheckedRunnable() {
610 >            public void realRun() {
611 >                lock.writeLock().lock();
612 >                lock.writeLock().unlock();
613 >            }});
614 >
615 >        waitForQueuedThread(lock, t1);
616 >
617 >        Thread t2 = newStartedThread(new CheckedRunnable() {
618 >            public void realRun() {
619 >                lock.readLock().lock();
620 >                lock.readLock().unlock();
621 >            }});
622 >
623 >        if (fair)
624 >            waitForQueuedThread(lock, t2);
625 >
626 >        Thread t3 = newStartedThread(new CheckedRunnable() {
627 >            public void realRun() {
628 >                lock.readLock().tryLock();
629 >                lock.readLock().unlock();
630 >            }});
631 >
632 >        assertTrue(lock.getReadLockCount() > 0);
633 >        awaitTermination(t3);
634 >        assertTrue(t1.isAlive());
635 >        if (fair) assertTrue(t2.isAlive());
636 >        lock.readLock().unlock();
637 >        awaitTermination(t1);
638 >        awaitTermination(t2);
639      }
640  
641 +    /**
642 +     * Read lock succeeds if write locked by current thread even if
643 +     * other threads are waiting for readlock
644 +     */
645 +    public void testReadHoldingWriteLock2()      { testReadHoldingWriteLock2(false); }
646 +    public void testReadHoldingWriteLock2_fair() { testReadHoldingWriteLock2(true); }
647 +    public void testReadHoldingWriteLock2(boolean fair) {
648 +        final PublicReentrantReadWriteLock lock =
649 +            new PublicReentrantReadWriteLock(fair);
650 +        lock.writeLock().lock();
651 +        lock.readLock().lock();
652 +        lock.readLock().unlock();
653 +
654 +        Thread t1 = newStartedThread(new CheckedRunnable() {
655 +            public void realRun() {
656 +                lock.readLock().lock();
657 +                lock.readLock().unlock();
658 +            }});
659 +        Thread t2 = newStartedThread(new CheckedRunnable() {
660 +            public void realRun() {
661 +                lock.readLock().lock();
662 +                lock.readLock().unlock();
663 +            }});
664 +
665 +        waitForQueuedThread(lock, t1);
666 +        waitForQueuedThread(lock, t2);
667 +        assertWriteLockedByMoi(lock);
668 +        lock.readLock().lock();
669 +        lock.readLock().unlock();
670 +        releaseWriteLock(lock);
671 +        awaitTermination(t1);
672 +        awaitTermination(t2);
673 +    }
674 +
675 +    /**
676 +     * Read lock succeeds if write locked by current thread even if
677 +     * other threads are waiting for writelock
678 +     */
679 +    public void testReadHoldingWriteLock3()      { testReadHoldingWriteLock3(false); }
680 +    public void testReadHoldingWriteLock3_fair() { testReadHoldingWriteLock3(true); }
681 +    public void testReadHoldingWriteLock3(boolean fair) {
682 +        final PublicReentrantReadWriteLock lock =
683 +            new PublicReentrantReadWriteLock(fair);
684 +        lock.writeLock().lock();
685 +        lock.readLock().lock();
686 +        lock.readLock().unlock();
687 +
688 +        Thread t1 = newStartedThread(new CheckedRunnable() {
689 +            public void realRun() {
690 +                lock.writeLock().lock();
691 +                lock.writeLock().unlock();
692 +            }});
693 +        Thread t2 = newStartedThread(new CheckedRunnable() {
694 +            public void realRun() {
695 +                lock.writeLock().lock();
696 +                lock.writeLock().unlock();
697 +            }});
698 +
699 +        waitForQueuedThread(lock, t1);
700 +        waitForQueuedThread(lock, t2);
701 +        assertWriteLockedByMoi(lock);
702 +        lock.readLock().lock();
703 +        lock.readLock().unlock();
704 +        assertWriteLockedByMoi(lock);
705 +        lock.writeLock().unlock();
706 +        awaitTermination(t1);
707 +        awaitTermination(t2);
708 +    }
709 +
710 +    /**
711 +     * Write lock succeeds if write locked by current thread even if
712 +     * other threads are waiting for writelock
713 +     */
714 +    public void testWriteHoldingWriteLock4()      { testWriteHoldingWriteLock4(false); }
715 +    public void testWriteHoldingWriteLock4_fair() { testWriteHoldingWriteLock4(true); }
716 +    public void testWriteHoldingWriteLock4(boolean fair) {
717 +        final PublicReentrantReadWriteLock lock =
718 +            new PublicReentrantReadWriteLock(fair);
719 +        lock.writeLock().lock();
720 +        lock.writeLock().lock();
721 +        lock.writeLock().unlock();
722 +
723 +        Thread t1 = newStartedThread(new CheckedRunnable() {
724 +            public void realRun() {
725 +                lock.writeLock().lock();
726 +                lock.writeLock().unlock();
727 +            }});
728 +        Thread t2 = newStartedThread(new CheckedRunnable() {
729 +            public void realRun() {
730 +                lock.writeLock().lock();
731 +                lock.writeLock().unlock();
732 +            }});
733 +
734 +        waitForQueuedThread(lock, t1);
735 +        waitForQueuedThread(lock, t2);
736 +        assertWriteLockedByMoi(lock);
737 +        assertEquals(1, lock.getWriteHoldCount());
738 +        lock.writeLock().lock();
739 +        assertWriteLockedByMoi(lock);
740 +        assertEquals(2, lock.getWriteHoldCount());
741 +        lock.writeLock().unlock();
742 +        assertWriteLockedByMoi(lock);
743 +        assertEquals(1, lock.getWriteHoldCount());
744 +        lock.writeLock().unlock();
745 +        awaitTermination(t1);
746 +        awaitTermination(t2);
747 +    }
748 +
749 +    /**
750 +     * Read tryLock succeeds if readlocked but not writelocked
751 +     */
752 +    public void testTryLockWhenReadLocked()      { testTryLockWhenReadLocked(false); }
753 +    public void testTryLockWhenReadLocked_fair() { testTryLockWhenReadLocked(true); }
754 +    public void testTryLockWhenReadLocked(boolean fair) {
755 +        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
756 +        lock.readLock().lock();
757 +        Thread t = newStartedThread(new CheckedRunnable() {
758 +            public void realRun() {
759 +                assertTrue(lock.readLock().tryLock());
760 +                lock.readLock().unlock();
761 +            }});
762 +
763 +        awaitTermination(t);
764 +        lock.readLock().unlock();
765 +    }
766 +
767 +    /**
768 +     * write tryLock fails when readlocked
769 +     */
770 +    public void testWriteTryLockWhenReadLocked()      { testWriteTryLockWhenReadLocked(false); }
771 +    public void testWriteTryLockWhenReadLocked_fair() { testWriteTryLockWhenReadLocked(true); }
772 +    public void testWriteTryLockWhenReadLocked(boolean fair) {
773 +        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
774 +        lock.readLock().lock();
775 +        Thread t = newStartedThread(new CheckedRunnable() {
776 +            public void realRun() {
777 +                assertFalse(lock.writeLock().tryLock());
778 +            }});
779  
780 <    private static long SHORT_DELAY_MS = 100;
781 <    private static long MEDIUM_DELAY_MS = 1000;
782 <    private static long LONG_DELAY_MS = 10000;
783 <
784 <    /*
785 <     * Unlocks an unlocked lock, throws Illegal Monitor State
786 <     *
787 <     */
788 <    
789 <    public void testIllegalMonitorStateException(){
790 <        ReentrantReadWriteLock rl = new ReentrantReadWriteLock();
791 <        try{
792 <            rl.writeLock().unlock();
793 <            fail("Should of thown Illegal Monitor State Exception");
794 <
795 <        }catch(IllegalMonitorStateException sucess){}
796 <
797 <
798 <    }
799 <    
800 <    /*
801 <     * makes a lock, locks it, tries to aquire the lock in another thread
802 <     * interrupts that thread and waits for an interrupted Exception to
803 <     * be thrown.
804 <     */
805 <
806 <    public void testInterruptedException(){
807 <        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
808 <        lock.writeLock().lock();
809 <        Thread t = new Thread(new Runnable() {
810 <                public void run(){
811 <                    try{
812 <                        lock.writeLock().lockInterruptibly();
813 <                        fail("should throw");
814 <                    }catch(InterruptedException sucess){}
815 <                }
816 <            });
817 <        t.start();
818 <        t.interrupt();
819 <        lock.writeLock().unlock();
820 <    }
821 <
822 <    /*
823 <     * tests for interrupted exception on a timed wait
824 <     *
825 <     */
826 <    
827 <
828 <    public void testInterruptedException2(){
829 <        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
830 <        lock.writeLock().lock();
831 <        Thread t = new Thread(new Runnable() {
832 <                public void run(){
833 <                    try{
834 <                        lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS);
835 <                        fail("should throw");
836 <                    }catch(InterruptedException sucess){}
837 <                }
838 <            });
839 <        t.start();
840 <        t.interrupt();
841 <    }
842 <
843 <    
844 <
845 <    /*
846 <     * current thread locks interruptibly the thread
847 <     * another thread tries to aquire the lock and blocks
848 <     * on the call. interrupt the attempted aquireLock
849 <     * assert that the first lock() call actually locked the lock
850 <     * assert that the current thread is the one holding the lock
851 <     */
852 <
853 <    public void testLockedInterruptibly() {
854 <        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();      
855 <        try {lock.writeLock().lockInterruptibly();} catch(Exception e) {}
856 <        Thread t = new Thread(new Runnable() {
857 <                public void run() {
858 <                    try {
859 <                        lock.writeLock().lockInterruptibly();
860 <                        fail("Failed to generate an Interrupted Exception");
861 <                    }
862 <                    catch(InterruptedException e) {}
863 <                }
864 <            });
865 <        t.start();
866 <        t.interrupt();
780 >        awaitTermination(t);
781 >        lock.readLock().unlock();
782 >    }
783 >
784 >    /**
785 >     * write timed tryLock times out if locked
786 >     */
787 >    public void testWriteTryLock_Timeout()      { testWriteTryLock_Timeout(false); }
788 >    public void testWriteTryLock_Timeout_fair() { testWriteTryLock_Timeout(true); }
789 >    public void testWriteTryLock_Timeout(boolean fair) {
790 >        final PublicReentrantReadWriteLock lock =
791 >            new PublicReentrantReadWriteLock(fair);
792 >        final long timeoutMillis = timeoutMillis();
793 >        lock.writeLock().lock();
794 >        Thread t = newStartedThread(new CheckedRunnable() {
795 >            public void realRun() throws InterruptedException {
796 >                long startTime = System.nanoTime();
797 >                assertFalse(lock.writeLock().tryLock(timeoutMillis, MILLISECONDS));
798 >                assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
799 >            }});
800 >
801 >        awaitTermination(t);
802 >        releaseWriteLock(lock);
803 >    }
804 >
805 >    /**
806 >     * read timed tryLock times out if write-locked
807 >     */
808 >    public void testReadTryLock_Timeout()      { testReadTryLock_Timeout(false); }
809 >    public void testReadTryLock_Timeout_fair() { testReadTryLock_Timeout(true); }
810 >    public void testReadTryLock_Timeout(boolean fair) {
811 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
812 >        lock.writeLock().lock();
813 >        Thread t = newStartedThread(new CheckedRunnable() {
814 >            public void realRun() throws InterruptedException {
815 >                long startTime = System.nanoTime();
816 >                long timeoutMillis = timeoutMillis();
817 >                assertFalse(lock.readLock().tryLock(timeoutMillis, MILLISECONDS));
818 >                assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
819 >            }});
820 >
821 >        awaitTermination(t);
822 >        assertTrue(lock.writeLock().isHeldByCurrentThread());
823 >        lock.writeLock().unlock();
824 >    }
825 >
826 >    /**
827 >     * write lockInterruptibly succeeds if unlocked, else is interruptible
828 >     */
829 >    public void testWriteLockInterruptibly()      { testWriteLockInterruptibly(false); }
830 >    public void testWriteLockInterruptibly_fair() { testWriteLockInterruptibly(true); }
831 >    public void testWriteLockInterruptibly(boolean fair) {
832 >        final PublicReentrantReadWriteLock lock =
833 >            new PublicReentrantReadWriteLock(fair);
834 >        try {
835 >            lock.writeLock().lockInterruptibly();
836 >        } catch (InterruptedException fail) { threadUnexpectedException(fail); }
837 >        Thread t = newStartedThread(new CheckedInterruptedRunnable() {
838 >            public void realRun() throws InterruptedException {
839 >                lock.writeLock().lockInterruptibly();
840 >            }});
841 >
842 >        waitForQueuedThread(lock, t);
843 >        t.interrupt();
844 >        assertTrue(lock.writeLock().isHeldByCurrentThread());
845 >        awaitTermination(t);
846 >        releaseWriteLock(lock);
847 >    }
848 >
849 >    /**
850 >     * read lockInterruptibly succeeds if lock free else is interruptible
851 >     */
852 >    public void testReadLockInterruptibly()      { testReadLockInterruptibly(false); }
853 >    public void testReadLockInterruptibly_fair() { testReadLockInterruptibly(true); }
854 >    public void testReadLockInterruptibly(boolean fair) {
855 >        final PublicReentrantReadWriteLock lock =
856 >            new PublicReentrantReadWriteLock(fair);
857 >        try {
858 >            lock.readLock().lockInterruptibly();
859 >            lock.readLock().unlock();
860 >            lock.writeLock().lockInterruptibly();
861 >        } catch (InterruptedException fail) { threadUnexpectedException(fail); }
862 >        Thread t = newStartedThread(new CheckedInterruptedRunnable() {
863 >            public void realRun() throws InterruptedException {
864 >                lock.readLock().lockInterruptibly();
865 >            }});
866 >
867 >        waitForQueuedThread(lock, t);
868 >        t.interrupt();
869 >        awaitTermination(t);
870 >        releaseWriteLock(lock);
871 >    }
872 >
873 >    /**
874 >     * Calling await without holding lock throws IllegalMonitorStateException
875 >     */
876 >    public void testAwait_IMSE()      { testAwait_IMSE(false); }
877 >    public void testAwait_IMSE_fair() { testAwait_IMSE(true); }
878 >    public void testAwait_IMSE(boolean fair) {
879 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
880 >        final Condition c = lock.writeLock().newCondition();
881 >        for (AwaitMethod awaitMethod : AwaitMethod.values()) {
882 >            long startTime = System.nanoTime();
883 >            try {
884 >                await(c, awaitMethod);
885 >                shouldThrow();
886 >            } catch (IllegalMonitorStateException success) {
887 >            } catch (InterruptedException fail) {
888 >                threadUnexpectedException(fail);
889 >            }
890 >            assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
891 >        }
892 >    }
893 >
894 >    /**
895 >     * Calling signal without holding lock throws IllegalMonitorStateException
896 >     */
897 >    public void testSignal_IMSE()      { testSignal_IMSE(false); }
898 >    public void testSignal_IMSE_fair() { testSignal_IMSE(true); }
899 >    public void testSignal_IMSE(boolean fair) {
900 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
901 >        final Condition c = lock.writeLock().newCondition();
902 >        try {
903 >            c.signal();
904 >            shouldThrow();
905 >        } catch (IllegalMonitorStateException success) {}
906 >    }
907 >
908 >    /**
909 >     * Calling signalAll without holding lock throws IllegalMonitorStateException
910 >     */
911 >    public void testSignalAll_IMSE()      { testSignalAll_IMSE(false); }
912 >    public void testSignalAll_IMSE_fair() { testSignalAll_IMSE(true); }
913 >    public void testSignalAll_IMSE(boolean fair) {
914 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
915 >        final Condition c = lock.writeLock().newCondition();
916 >        try {
917 >            c.signalAll();
918 >            shouldThrow();
919 >        } catch (IllegalMonitorStateException success) {}
920 >    }
921 >
922 >    /**
923 >     * awaitNanos without a signal times out
924 >     */
925 >    public void testAwaitNanos_Timeout()      { testAwaitNanos_Timeout(false); }
926 >    public void testAwaitNanos_Timeout_fair() { testAwaitNanos_Timeout(true); }
927 >    public void testAwaitNanos_Timeout(boolean fair) {
928 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
929 >        final Condition c = lock.writeLock().newCondition();
930 >        final long timeoutMillis = timeoutMillis();
931 >        lock.writeLock().lock();
932 >        final long startTime = System.nanoTime();
933 >        final long timeoutNanos = MILLISECONDS.toNanos(timeoutMillis);
934 >        try {
935 >            long nanosRemaining = c.awaitNanos(timeoutNanos);
936 >            assertTrue(nanosRemaining <= 0);
937 >        } catch (InterruptedException fail) { threadUnexpectedException(fail); }
938 >        assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
939 >        lock.writeLock().unlock();
940 >    }
941 >
942 >    /**
943 >     * timed await without a signal times out
944 >     */
945 >    public void testAwait_Timeout()      { testAwait_Timeout(false); }
946 >    public void testAwait_Timeout_fair() { testAwait_Timeout(true); }
947 >    public void testAwait_Timeout(boolean fair) {
948 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
949 >        final Condition c = lock.writeLock().newCondition();
950 >        final long timeoutMillis = timeoutMillis();
951 >        lock.writeLock().lock();
952 >        final long startTime = System.nanoTime();
953 >        try {
954 >            assertFalse(c.await(timeoutMillis, MILLISECONDS));
955 >        } catch (InterruptedException fail) { threadUnexpectedException(fail); }
956 >        assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
957 >        lock.writeLock().unlock();
958 >    }
959 >
960 >    /**
961 >     * awaitUntil without a signal times out
962 >     */
963 >    public void testAwaitUntil_Timeout()      { testAwaitUntil_Timeout(false); }
964 >    public void testAwaitUntil_Timeout_fair() { testAwaitUntil_Timeout(true); }
965 >    public void testAwaitUntil_Timeout(boolean fair) {
966 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
967 >        final Condition c = lock.writeLock().newCondition();
968 >        lock.writeLock().lock();
969 >        // We shouldn't assume that nanoTime and currentTimeMillis
970 >        // use the same time source, so don't use nanoTime here.
971 >        final java.util.Date delayedDate = delayedDate(timeoutMillis());
972 >        try {
973 >            assertFalse(c.awaitUntil(delayedDate));
974 >        } catch (InterruptedException fail) { threadUnexpectedException(fail); }
975 >        assertTrue(new java.util.Date().getTime() >= delayedDate.getTime());
976 >        lock.writeLock().unlock();
977 >    }
978 >
979 >    /**
980 >     * await returns when signalled
981 >     */
982 >    public void testAwait()      { testAwait(false); }
983 >    public void testAwait_fair() { testAwait(true); }
984 >    public void testAwait(boolean fair) {
985 >        final PublicReentrantReadWriteLock lock =
986 >            new PublicReentrantReadWriteLock(fair);
987 >        final Condition c = lock.writeLock().newCondition();
988 >        final CountDownLatch locked = new CountDownLatch(1);
989 >        Thread t = newStartedThread(new CheckedRunnable() {
990 >            public void realRun() throws InterruptedException {
991 >                lock.writeLock().lock();
992 >                locked.countDown();
993 >                c.await();
994 >                lock.writeLock().unlock();
995 >            }});
996 >
997 >        await(locked);
998 >        lock.writeLock().lock();
999 >        assertHasWaiters(lock, c, t);
1000 >        c.signal();
1001 >        assertHasNoWaiters(lock, c);
1002 >        assertTrue(t.isAlive());
1003 >        lock.writeLock().unlock();
1004 >        awaitTermination(t);
1005 >    }
1006 >
1007 >    /**
1008 >     * awaitUninterruptibly is uninterruptible
1009 >     */
1010 >    public void testAwaitUninterruptibly()      { testAwaitUninterruptibly(false); }
1011 >    public void testAwaitUninterruptibly_fair() { testAwaitUninterruptibly(true); }
1012 >    public void testAwaitUninterruptibly(boolean fair) {
1013 >        final Lock lock = new ReentrantReadWriteLock(fair).writeLock();
1014 >        final Condition condition = lock.newCondition();
1015 >        final CountDownLatch pleaseInterrupt = new CountDownLatch(2);
1016 >
1017 >        Thread t1 = newStartedThread(new CheckedRunnable() {
1018 >            public void realRun() {
1019 >                // Interrupt before awaitUninterruptibly
1020 >                lock.lock();
1021 >                pleaseInterrupt.countDown();
1022 >                Thread.currentThread().interrupt();
1023 >                condition.awaitUninterruptibly();
1024 >                assertTrue(Thread.interrupted());
1025 >                lock.unlock();
1026 >            }});
1027 >
1028 >        Thread t2 = newStartedThread(new CheckedRunnable() {
1029 >            public void realRun() {
1030 >                // Interrupt during awaitUninterruptibly
1031 >                lock.lock();
1032 >                pleaseInterrupt.countDown();
1033 >                condition.awaitUninterruptibly();
1034 >                assertTrue(Thread.interrupted());
1035 >                lock.unlock();
1036 >            }});
1037 >
1038 >        await(pleaseInterrupt);
1039 >        t2.interrupt();
1040 >        lock.lock();
1041 >        lock.unlock();
1042 >        assertThreadBlocks(t1, Thread.State.WAITING);
1043 >        assertThreadBlocks(t2, Thread.State.WAITING);
1044 >
1045 >        lock.lock();
1046 >        condition.signalAll();
1047 >        lock.unlock();
1048 >
1049 >        awaitTermination(t1);
1050 >        awaitTermination(t2);
1051 >    }
1052 >
1053 >    /**
1054 >     * await/awaitNanos/awaitUntil is interruptible
1055 >     */
1056 >    public void testInterruptible_await()           { testInterruptible(false, AwaitMethod.await); }
1057 >    public void testInterruptible_await_fair()      { testInterruptible(true,  AwaitMethod.await); }
1058 >    public void testInterruptible_awaitTimed()      { testInterruptible(false, AwaitMethod.awaitTimed); }
1059 >    public void testInterruptible_awaitTimed_fair() { testInterruptible(true,  AwaitMethod.awaitTimed); }
1060 >    public void testInterruptible_awaitNanos()      { testInterruptible(false, AwaitMethod.awaitNanos); }
1061 >    public void testInterruptible_awaitNanos_fair() { testInterruptible(true,  AwaitMethod.awaitNanos); }
1062 >    public void testInterruptible_awaitUntil()      { testInterruptible(false, AwaitMethod.awaitUntil); }
1063 >    public void testInterruptible_awaitUntil_fair() { testInterruptible(true,  AwaitMethod.awaitUntil); }
1064 >    public void testInterruptible(boolean fair, final AwaitMethod awaitMethod) {
1065 >        final PublicReentrantReadWriteLock lock =
1066 >            new PublicReentrantReadWriteLock(fair);
1067 >        final Condition c = lock.writeLock().newCondition();
1068 >        final CountDownLatch locked = new CountDownLatch(1);
1069 >        Thread t = newStartedThread(new CheckedInterruptedRunnable() {
1070 >            public void realRun() throws InterruptedException {
1071 >                lock.writeLock().lock();
1072 >                assertWriteLockedByMoi(lock);
1073 >                assertHasNoWaiters(lock, c);
1074 >                locked.countDown();
1075 >                try {
1076 >                    await(c, awaitMethod);
1077 >                } finally {
1078 >                    assertWriteLockedByMoi(lock);
1079 >                    assertHasNoWaiters(lock, c);
1080 >                    lock.writeLock().unlock();
1081 >                    assertFalse(Thread.interrupted());
1082 >                }
1083 >            }});
1084 >
1085 >        await(locked);
1086 >        assertHasWaiters(lock, c, t);
1087 >        t.interrupt();
1088 >        awaitTermination(t);
1089 >        assertNotWriteLocked(lock);
1090 >    }
1091 >
1092 >    /**
1093 >     * signalAll wakes up all threads
1094 >     */
1095 >    public void testSignalAll_await()           { testSignalAll(false, AwaitMethod.await); }
1096 >    public void testSignalAll_await_fair()      { testSignalAll(true,  AwaitMethod.await); }
1097 >    public void testSignalAll_awaitTimed()      { testSignalAll(false, AwaitMethod.awaitTimed); }
1098 >    public void testSignalAll_awaitTimed_fair() { testSignalAll(true,  AwaitMethod.awaitTimed); }
1099 >    public void testSignalAll_awaitNanos()      { testSignalAll(false, AwaitMethod.awaitNanos); }
1100 >    public void testSignalAll_awaitNanos_fair() { testSignalAll(true,  AwaitMethod.awaitNanos); }
1101 >    public void testSignalAll_awaitUntil()      { testSignalAll(false, AwaitMethod.awaitUntil); }
1102 >    public void testSignalAll_awaitUntil_fair() { testSignalAll(true,  AwaitMethod.awaitUntil); }
1103 >    public void testSignalAll(boolean fair, final AwaitMethod awaitMethod) {
1104 >        final PublicReentrantReadWriteLock lock =
1105 >            new PublicReentrantReadWriteLock(fair);
1106 >        final Condition c = lock.writeLock().newCondition();
1107 >        final CountDownLatch locked = new CountDownLatch(2);
1108 >        final Lock writeLock = lock.writeLock();
1109 >        class Awaiter extends CheckedRunnable {
1110 >            public void realRun() throws InterruptedException {
1111 >                writeLock.lock();
1112 >                locked.countDown();
1113 >                await(c, awaitMethod);
1114 >                writeLock.unlock();
1115 >            }
1116 >        }
1117 >
1118 >        Thread t1 = newStartedThread(new Awaiter());
1119 >        Thread t2 = newStartedThread(new Awaiter());
1120 >
1121 >        await(locked);
1122 >        writeLock.lock();
1123 >        assertHasWaiters(lock, c, t1, t2);
1124 >        c.signalAll();
1125 >        assertHasNoWaiters(lock, c);
1126 >        writeLock.unlock();
1127 >        awaitTermination(t1);
1128 >        awaitTermination(t2);
1129 >    }
1130 >
1131 >    /**
1132 >     * signal wakes up waiting threads in FIFO order
1133 >     */
1134 >    public void testSignalWakesFifo()      { testSignalWakesFifo(false); }
1135 >    public void testSignalWakesFifo_fair() { testSignalWakesFifo(true); }
1136 >    public void testSignalWakesFifo(boolean fair) {
1137 >        final PublicReentrantReadWriteLock lock =
1138 >            new PublicReentrantReadWriteLock(fair);
1139 >        final Condition c = lock.writeLock().newCondition();
1140 >        final CountDownLatch locked1 = new CountDownLatch(1);
1141 >        final CountDownLatch locked2 = new CountDownLatch(1);
1142 >        final Lock writeLock = lock.writeLock();
1143 >        Thread t1 = newStartedThread(new CheckedRunnable() {
1144 >            public void realRun() throws InterruptedException {
1145 >                writeLock.lock();
1146 >                locked1.countDown();
1147 >                c.await();
1148 >                writeLock.unlock();
1149 >            }});
1150 >
1151 >        await(locked1);
1152 >
1153 >        Thread t2 = newStartedThread(new CheckedRunnable() {
1154 >            public void realRun() throws InterruptedException {
1155 >                writeLock.lock();
1156 >                locked2.countDown();
1157 >                c.await();
1158 >                writeLock.unlock();
1159 >            }});
1160 >
1161 >        await(locked2);
1162 >
1163 >        writeLock.lock();
1164 >        assertHasWaiters(lock, c, t1, t2);
1165 >        assertFalse(lock.hasQueuedThreads());
1166 >        c.signal();
1167 >        assertHasWaiters(lock, c, t2);
1168 >        assertTrue(lock.hasQueuedThread(t1));
1169 >        assertFalse(lock.hasQueuedThread(t2));
1170 >        c.signal();
1171 >        assertHasNoWaiters(lock, c);
1172 >        assertTrue(lock.hasQueuedThread(t1));
1173 >        assertTrue(lock.hasQueuedThread(t2));
1174 >        writeLock.unlock();
1175 >        awaitTermination(t1);
1176 >        awaitTermination(t2);
1177 >    }
1178 >
1179 >    /**
1180 >     * await after multiple reentrant locking preserves lock count
1181 >     */
1182 >    public void testAwaitLockCount()      { testAwaitLockCount(false); }
1183 >    public void testAwaitLockCount_fair() { testAwaitLockCount(true); }
1184 >    public void testAwaitLockCount(boolean fair) {
1185 >        final PublicReentrantReadWriteLock lock =
1186 >            new PublicReentrantReadWriteLock(fair);
1187 >        final Condition c = lock.writeLock().newCondition();
1188 >        final CountDownLatch locked = new CountDownLatch(2);
1189 >        Thread t1 = newStartedThread(new CheckedRunnable() {
1190 >            public void realRun() throws InterruptedException {
1191 >                lock.writeLock().lock();
1192 >                assertWriteLockedByMoi(lock);
1193 >                assertEquals(1, lock.writeLock().getHoldCount());
1194 >                locked.countDown();
1195 >                c.await();
1196 >                assertWriteLockedByMoi(lock);
1197 >                assertEquals(1, lock.writeLock().getHoldCount());
1198 >                lock.writeLock().unlock();
1199 >            }});
1200 >
1201 >        Thread t2 = newStartedThread(new CheckedRunnable() {
1202 >            public void realRun() throws InterruptedException {
1203 >                lock.writeLock().lock();
1204 >                lock.writeLock().lock();
1205 >                assertWriteLockedByMoi(lock);
1206 >                assertEquals(2, lock.writeLock().getHoldCount());
1207 >                locked.countDown();
1208 >                c.await();
1209 >                assertWriteLockedByMoi(lock);
1210 >                assertEquals(2, lock.writeLock().getHoldCount());
1211 >                lock.writeLock().unlock();
1212 >                lock.writeLock().unlock();
1213 >            }});
1214 >
1215 >        await(locked);
1216 >        lock.writeLock().lock();
1217 >        assertHasWaiters(lock, c, t1, t2);
1218 >        c.signalAll();
1219 >        assertHasNoWaiters(lock, c);
1220 >        lock.writeLock().unlock();
1221 >        awaitTermination(t1);
1222 >        awaitTermination(t2);
1223 >    }
1224 >
1225 >    /**
1226 >     * A serialized lock deserializes as unlocked
1227 >     */
1228 >    public void testSerialization()      { testSerialization(false); }
1229 >    public void testSerialization_fair() { testSerialization(true); }
1230 >    public void testSerialization(boolean fair) {
1231 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1232 >        lock.writeLock().lock();
1233 >        lock.readLock().lock();
1234 >
1235 >        ReentrantReadWriteLock clone = serialClone(lock);
1236 >        assertEquals(lock.isFair(), clone.isFair());
1237 >        assertTrue(lock.isWriteLocked());
1238 >        assertFalse(clone.isWriteLocked());
1239 >        assertEquals(1, lock.getReadLockCount());
1240 >        assertEquals(0, clone.getReadLockCount());
1241 >        clone.writeLock().lock();
1242 >        clone.readLock().lock();
1243 >        assertTrue(clone.isWriteLocked());
1244 >        assertEquals(1, clone.getReadLockCount());
1245 >        clone.readLock().unlock();
1246 >        clone.writeLock().unlock();
1247 >        assertFalse(clone.isWriteLocked());
1248 >        assertEquals(1, lock.getReadLockCount());
1249 >        assertEquals(0, clone.getReadLockCount());
1250 >    }
1251 >
1252 >    /**
1253 >     * hasQueuedThreads reports whether there are waiting threads
1254 >     */
1255 >    public void testHasQueuedThreads()      { testHasQueuedThreads(false); }
1256 >    public void testHasQueuedThreads_fair() { testHasQueuedThreads(true); }
1257 >    public void testHasQueuedThreads(boolean fair) {
1258 >        final PublicReentrantReadWriteLock lock =
1259 >            new PublicReentrantReadWriteLock(fair);
1260 >        Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1261 >        Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1262 >        assertFalse(lock.hasQueuedThreads());
1263 >        lock.writeLock().lock();
1264 >        assertFalse(lock.hasQueuedThreads());
1265 >        t1.start();
1266 >        waitForQueuedThread(lock, t1);
1267 >        assertTrue(lock.hasQueuedThreads());
1268 >        t2.start();
1269 >        waitForQueuedThread(lock, t2);
1270 >        assertTrue(lock.hasQueuedThreads());
1271 >        t1.interrupt();
1272 >        awaitTermination(t1);
1273 >        assertTrue(lock.hasQueuedThreads());
1274 >        lock.writeLock().unlock();
1275 >        awaitTermination(t2);
1276 >        assertFalse(lock.hasQueuedThreads());
1277 >    }
1278 >
1279 >    /**
1280 >     * hasQueuedThread(null) throws NPE
1281 >     */
1282 >    public void testHasQueuedThreadNPE()      { testHasQueuedThreadNPE(false); }
1283 >    public void testHasQueuedThreadNPE_fair() { testHasQueuedThreadNPE(true); }
1284 >    public void testHasQueuedThreadNPE(boolean fair) {
1285 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1286 >        try {
1287 >            lock.hasQueuedThread(null);
1288 >            shouldThrow();
1289 >        } catch (NullPointerException success) {}
1290 >    }
1291 >
1292 >    /**
1293 >     * hasQueuedThread reports whether a thread is queued
1294 >     */
1295 >    public void testHasQueuedThread()      { testHasQueuedThread(false); }
1296 >    public void testHasQueuedThread_fair() { testHasQueuedThread(true); }
1297 >    public void testHasQueuedThread(boolean fair) {
1298 >        final PublicReentrantReadWriteLock lock =
1299 >            new PublicReentrantReadWriteLock(fair);
1300 >        Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1301 >        Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1302 >        assertFalse(lock.hasQueuedThread(t1));
1303 >        assertFalse(lock.hasQueuedThread(t2));
1304 >        lock.writeLock().lock();
1305 >        t1.start();
1306 >        waitForQueuedThread(lock, t1);
1307 >        assertTrue(lock.hasQueuedThread(t1));
1308 >        assertFalse(lock.hasQueuedThread(t2));
1309 >        t2.start();
1310 >        waitForQueuedThread(lock, t2);
1311 >        assertTrue(lock.hasQueuedThread(t1));
1312 >        assertTrue(lock.hasQueuedThread(t2));
1313 >        t1.interrupt();
1314 >        awaitTermination(t1);
1315 >        assertFalse(lock.hasQueuedThread(t1));
1316 >        assertTrue(lock.hasQueuedThread(t2));
1317 >        lock.writeLock().unlock();
1318 >        awaitTermination(t2);
1319 >        assertFalse(lock.hasQueuedThread(t1));
1320 >        assertFalse(lock.hasQueuedThread(t2));
1321 >    }
1322 >
1323 >    /**
1324 >     * getQueueLength reports number of waiting threads
1325 >     */
1326 >    public void testGetQueueLength()      { testGetQueueLength(false); }
1327 >    public void testGetQueueLength_fair() { testGetQueueLength(true); }
1328 >    public void testGetQueueLength(boolean fair) {
1329 >        final PublicReentrantReadWriteLock lock =
1330 >            new PublicReentrantReadWriteLock(fair);
1331 >        Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1332 >        Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1333 >        assertEquals(0, lock.getQueueLength());
1334 >        lock.writeLock().lock();
1335 >        t1.start();
1336 >        waitForQueuedThread(lock, t1);
1337 >        assertEquals(1, lock.getQueueLength());
1338 >        t2.start();
1339 >        waitForQueuedThread(lock, t2);
1340 >        assertEquals(2, lock.getQueueLength());
1341 >        t1.interrupt();
1342 >        awaitTermination(t1);
1343 >        assertEquals(1, lock.getQueueLength());
1344 >        lock.writeLock().unlock();
1345 >        awaitTermination(t2);
1346 >        assertEquals(0, lock.getQueueLength());
1347 >    }
1348 >
1349 >    /**
1350 >     * getQueuedThreads includes waiting threads
1351 >     */
1352 >    public void testGetQueuedThreads()      { testGetQueuedThreads(false); }
1353 >    public void testGetQueuedThreads_fair() { testGetQueuedThreads(true); }
1354 >    public void testGetQueuedThreads(boolean fair) {
1355 >        final PublicReentrantReadWriteLock lock =
1356 >            new PublicReentrantReadWriteLock(fair);
1357 >        Thread t1 = new Thread(new InterruptedLockRunnable(lock));
1358 >        Thread t2 = new Thread(new InterruptibleLockRunnable(lock));
1359 >        assertTrue(lock.getQueuedThreads().isEmpty());
1360 >        lock.writeLock().lock();
1361 >        assertTrue(lock.getQueuedThreads().isEmpty());
1362 >        t1.start();
1363 >        waitForQueuedThread(lock, t1);
1364 >        assertEquals(1, lock.getQueuedThreads().size());
1365 >        assertTrue(lock.getQueuedThreads().contains(t1));
1366 >        t2.start();
1367 >        waitForQueuedThread(lock, t2);
1368 >        assertEquals(2, lock.getQueuedThreads().size());
1369 >        assertTrue(lock.getQueuedThreads().contains(t1));
1370 >        assertTrue(lock.getQueuedThreads().contains(t2));
1371 >        t1.interrupt();
1372 >        awaitTermination(t1);
1373 >        assertFalse(lock.getQueuedThreads().contains(t1));
1374 >        assertTrue(lock.getQueuedThreads().contains(t2));
1375 >        assertEquals(1, lock.getQueuedThreads().size());
1376 >        lock.writeLock().unlock();
1377 >        awaitTermination(t2);
1378 >        assertTrue(lock.getQueuedThreads().isEmpty());
1379 >    }
1380 >
1381 >    /**
1382 >     * hasWaiters throws NPE if null
1383 >     */
1384 >    public void testHasWaitersNPE()      { testHasWaitersNPE(false); }
1385 >    public void testHasWaitersNPE_fair() { testHasWaitersNPE(true); }
1386 >    public void testHasWaitersNPE(boolean fair) {
1387 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1388 >        try {
1389 >            lock.hasWaiters(null);
1390 >            shouldThrow();
1391 >        } catch (NullPointerException success) {}
1392 >    }
1393 >
1394 >    /**
1395 >     * getWaitQueueLength throws NPE if null
1396 >     */
1397 >    public void testGetWaitQueueLengthNPE()      { testGetWaitQueueLengthNPE(false); }
1398 >    public void testGetWaitQueueLengthNPE_fair() { testGetWaitQueueLengthNPE(true); }
1399 >    public void testGetWaitQueueLengthNPE(boolean fair) {
1400 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1401 >        try {
1402 >            lock.getWaitQueueLength(null);
1403 >            shouldThrow();
1404 >        } catch (NullPointerException success) {}
1405 >    }
1406 >
1407 >    /**
1408 >     * getWaitingThreads throws NPE if null
1409 >     */
1410 >    public void testGetWaitingThreadsNPE()      { testGetWaitingThreadsNPE(false); }
1411 >    public void testGetWaitingThreadsNPE_fair() { testGetWaitingThreadsNPE(true); }
1412 >    public void testGetWaitingThreadsNPE(boolean fair) {
1413 >        final PublicReentrantReadWriteLock lock = new PublicReentrantReadWriteLock(fair);
1414 >        try {
1415 >            lock.getWaitingThreads(null);
1416 >            shouldThrow();
1417 >        } catch (NullPointerException success) {}
1418 >    }
1419 >
1420 >    /**
1421 >     * hasWaiters throws IllegalArgumentException if not owned
1422 >     */
1423 >    public void testHasWaitersIAE()      { testHasWaitersIAE(false); }
1424 >    public void testHasWaitersIAE_fair() { testHasWaitersIAE(true); }
1425 >    public void testHasWaitersIAE(boolean fair) {
1426 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1427 >        final Condition c = lock.writeLock().newCondition();
1428 >        final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1429 >        try {
1430 >            lock2.hasWaiters(c);
1431 >            shouldThrow();
1432 >        } catch (IllegalArgumentException success) {}
1433 >    }
1434 >
1435 >    /**
1436 >     * hasWaiters throws IllegalMonitorStateException if not locked
1437 >     */
1438 >    public void testHasWaitersIMSE()      { testHasWaitersIMSE(false); }
1439 >    public void testHasWaitersIMSE_fair() { testHasWaitersIMSE(true); }
1440 >    public void testHasWaitersIMSE(boolean fair) {
1441 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1442 >        final Condition c = lock.writeLock().newCondition();
1443 >        try {
1444 >            lock.hasWaiters(c);
1445 >            shouldThrow();
1446 >        } catch (IllegalMonitorStateException success) {}
1447 >    }
1448 >
1449 >    /**
1450 >     * getWaitQueueLength throws IllegalArgumentException if not owned
1451 >     */
1452 >    public void testGetWaitQueueLengthIAE()      { testGetWaitQueueLengthIAE(false); }
1453 >    public void testGetWaitQueueLengthIAE_fair() { testGetWaitQueueLengthIAE(true); }
1454 >    public void testGetWaitQueueLengthIAE(boolean fair) {
1455 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1456 >        final Condition c = lock.writeLock().newCondition();
1457 >        final ReentrantReadWriteLock lock2 = new ReentrantReadWriteLock(fair);
1458 >        try {
1459 >            lock2.getWaitQueueLength(c);
1460 >            shouldThrow();
1461 >        } catch (IllegalArgumentException success) {}
1462 >    }
1463 >
1464 >    /**
1465 >     * getWaitQueueLength throws IllegalMonitorStateException if not locked
1466 >     */
1467 >    public void testGetWaitQueueLengthIMSE()      { testGetWaitQueueLengthIMSE(false); }
1468 >    public void testGetWaitQueueLengthIMSE_fair() { testGetWaitQueueLengthIMSE(true); }
1469 >    public void testGetWaitQueueLengthIMSE(boolean fair) {
1470 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1471 >        final Condition c = lock.writeLock().newCondition();
1472 >        try {
1473 >            lock.getWaitQueueLength(c);
1474 >            shouldThrow();
1475 >        } catch (IllegalMonitorStateException success) {}
1476 >    }
1477 >
1478 >    /**
1479 >     * getWaitingThreads throws IllegalArgumentException if not owned
1480 >     */
1481 >    public void testGetWaitingThreadsIAE()      { testGetWaitingThreadsIAE(false); }
1482 >    public void testGetWaitingThreadsIAE_fair() { testGetWaitingThreadsIAE(true); }
1483 >    public void testGetWaitingThreadsIAE(boolean fair) {
1484 >        final PublicReentrantReadWriteLock lock =
1485 >            new PublicReentrantReadWriteLock(fair);
1486 >        final Condition c = lock.writeLock().newCondition();
1487 >        final PublicReentrantReadWriteLock lock2 =
1488 >            new PublicReentrantReadWriteLock(fair);
1489 >        try {
1490 >            lock2.getWaitingThreads(c);
1491 >            shouldThrow();
1492 >        } catch (IllegalArgumentException success) {}
1493 >    }
1494 >
1495 >    /**
1496 >     * getWaitingThreads throws IllegalMonitorStateException if not locked
1497 >     */
1498 >    public void testGetWaitingThreadsIMSE()      { testGetWaitingThreadsIMSE(false); }
1499 >    public void testGetWaitingThreadsIMSE_fair() { testGetWaitingThreadsIMSE(true); }
1500 >    public void testGetWaitingThreadsIMSE(boolean fair) {
1501 >        final PublicReentrantReadWriteLock lock =
1502 >            new PublicReentrantReadWriteLock(fair);
1503 >        final Condition c = lock.writeLock().newCondition();
1504 >        try {
1505 >            lock.getWaitingThreads(c);
1506 >            shouldThrow();
1507 >        } catch (IllegalMonitorStateException success) {}
1508 >    }
1509 >
1510 >    /**
1511 >     * hasWaiters returns true when a thread is waiting, else false
1512 >     */
1513 >    public void testHasWaiters()      { testHasWaiters(false); }
1514 >    public void testHasWaiters_fair() { testHasWaiters(true); }
1515 >    public void testHasWaiters(boolean fair) {
1516 >        final PublicReentrantReadWriteLock lock =
1517 >            new PublicReentrantReadWriteLock(fair);
1518 >        final Condition c = lock.writeLock().newCondition();
1519 >        final CountDownLatch locked = new CountDownLatch(1);
1520 >        Thread t = newStartedThread(new CheckedRunnable() {
1521 >            public void realRun() throws InterruptedException {
1522 >                lock.writeLock().lock();
1523 >                assertHasNoWaiters(lock, c);
1524 >                assertFalse(lock.hasWaiters(c));
1525 >                locked.countDown();
1526 >                c.await();
1527 >                assertHasNoWaiters(lock, c);
1528 >                assertFalse(lock.hasWaiters(c));
1529 >                lock.writeLock().unlock();
1530 >            }});
1531 >
1532 >        await(locked);
1533 >        lock.writeLock().lock();
1534 >        assertHasWaiters(lock, c, t);
1535 >        assertTrue(lock.hasWaiters(c));
1536 >        c.signal();
1537 >        assertHasNoWaiters(lock, c);
1538 >        assertFalse(lock.hasWaiters(c));
1539 >        lock.writeLock().unlock();
1540 >        awaitTermination(t);
1541 >        assertHasNoWaiters(lock, c);
1542 >    }
1543 >
1544 >    /**
1545 >     * getWaitQueueLength returns number of waiting threads
1546 >     */
1547 >    public void testGetWaitQueueLength()      { testGetWaitQueueLength(false); }
1548 >    public void testGetWaitQueueLength_fair() { testGetWaitQueueLength(true); }
1549 >    public void testGetWaitQueueLength(boolean fair) {
1550 >        final PublicReentrantReadWriteLock lock =
1551 >            new PublicReentrantReadWriteLock(fair);
1552 >        final Condition c = lock.writeLock().newCondition();
1553 >        final CountDownLatch locked = new CountDownLatch(1);
1554 >        Thread t = newStartedThread(new CheckedRunnable() {
1555 >            public void realRun() throws InterruptedException {
1556 >                lock.writeLock().lock();
1557 >                assertEquals(0, lock.getWaitQueueLength(c));
1558 >                locked.countDown();
1559 >                c.await();
1560 >                lock.writeLock().unlock();
1561 >            }});
1562 >
1563 >        await(locked);
1564 >        lock.writeLock().lock();
1565 >        assertHasWaiters(lock, c, t);
1566 >        assertEquals(1, lock.getWaitQueueLength(c));
1567 >        c.signal();
1568 >        assertHasNoWaiters(lock, c);
1569 >        assertEquals(0, lock.getWaitQueueLength(c));
1570 >        lock.writeLock().unlock();
1571 >        awaitTermination(t);
1572 >    }
1573 >
1574 >    /**
1575 >     * getWaitingThreads returns only and all waiting threads
1576 >     */
1577 >    public void testGetWaitingThreads()      { testGetWaitingThreads(false); }
1578 >    public void testGetWaitingThreads_fair() { testGetWaitingThreads(true); }
1579 >    public void testGetWaitingThreads(boolean fair) {
1580 >        final PublicReentrantReadWriteLock lock =
1581 >            new PublicReentrantReadWriteLock(fair);
1582 >        final Condition c = lock.writeLock().newCondition();
1583 >        final CountDownLatch locked1 = new CountDownLatch(1);
1584 >        final CountDownLatch locked2 = new CountDownLatch(1);
1585 >        Thread t1 = new Thread(new CheckedRunnable() {
1586 >            public void realRun() throws InterruptedException {
1587 >                lock.writeLock().lock();
1588 >                assertTrue(lock.getWaitingThreads(c).isEmpty());
1589 >                locked1.countDown();
1590 >                c.await();
1591 >                lock.writeLock().unlock();
1592 >            }});
1593 >
1594 >        Thread t2 = new Thread(new CheckedRunnable() {
1595 >            public void realRun() throws InterruptedException {
1596 >                lock.writeLock().lock();
1597 >                assertFalse(lock.getWaitingThreads(c).isEmpty());
1598 >                locked2.countDown();
1599 >                c.await();
1600 >                lock.writeLock().unlock();
1601 >            }});
1602 >
1603 >        lock.writeLock().lock();
1604 >        assertTrue(lock.getWaitingThreads(c).isEmpty());
1605 >        lock.writeLock().unlock();
1606 >
1607 >        t1.start();
1608 >        await(locked1);
1609 >        t2.start();
1610 >        await(locked2);
1611 >
1612 >        lock.writeLock().lock();
1613 >        assertTrue(lock.hasWaiters(c));
1614 >        assertTrue(lock.getWaitingThreads(c).contains(t1));
1615 >        assertTrue(lock.getWaitingThreads(c).contains(t2));
1616 >        assertEquals(2, lock.getWaitingThreads(c).size());
1617 >        c.signalAll();
1618 >        assertHasNoWaiters(lock, c);
1619 >        lock.writeLock().unlock();
1620 >
1621 >        awaitTermination(t1);
1622 >        awaitTermination(t2);
1623 >
1624 >        assertHasNoWaiters(lock, c);
1625 >    }
1626 >
1627 >    /**
1628 >     * toString indicates current lock state
1629 >     */
1630 >    public void testToString()      { testToString(false); }
1631 >    public void testToString_fair() { testToString(true); }
1632 >    public void testToString(boolean fair) {
1633 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1634 >        assertTrue(lock.toString().contains("Write locks = 0"));
1635 >        assertTrue(lock.toString().contains("Read locks = 0"));
1636 >        lock.writeLock().lock();
1637 >        assertTrue(lock.toString().contains("Write locks = 1"));
1638 >        assertTrue(lock.toString().contains("Read locks = 0"));
1639 >        lock.writeLock().lock();
1640 >        assertTrue(lock.toString().contains("Write locks = 2"));
1641 >        assertTrue(lock.toString().contains("Read locks = 0"));
1642 >        lock.writeLock().unlock();
1643 >        lock.writeLock().unlock();
1644 >        lock.readLock().lock();
1645 >        assertTrue(lock.toString().contains("Write locks = 0"));
1646 >        assertTrue(lock.toString().contains("Read locks = 1"));
1647 >        lock.readLock().lock();
1648 >        assertTrue(lock.toString().contains("Write locks = 0"));
1649 >        assertTrue(lock.toString().contains("Read locks = 2"));
1650 >    }
1651 >
1652 >    /**
1653 >     * readLock.toString indicates current lock state
1654 >     */
1655 >    public void testReadLockToString()      { testReadLockToString(false); }
1656 >    public void testReadLockToString_fair() { testReadLockToString(true); }
1657 >    public void testReadLockToString(boolean fair) {
1658 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1659 >        assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1660 >        lock.readLock().lock();
1661 >        assertTrue(lock.readLock().toString().contains("Read locks = 1"));
1662 >        lock.readLock().lock();
1663 >        assertTrue(lock.readLock().toString().contains("Read locks = 2"));
1664 >        lock.readLock().unlock();
1665 >        assertTrue(lock.readLock().toString().contains("Read locks = 1"));
1666 >        lock.readLock().unlock();
1667 >        assertTrue(lock.readLock().toString().contains("Read locks = 0"));
1668 >    }
1669 >
1670 >    /**
1671 >     * writeLock.toString indicates current lock state
1672 >     */
1673 >    public void testWriteLockToString()      { testWriteLockToString(false); }
1674 >    public void testWriteLockToString_fair() { testWriteLockToString(true); }
1675 >    public void testWriteLockToString(boolean fair) {
1676 >        final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fair);
1677 >        assertTrue(lock.writeLock().toString().contains("Unlocked"));
1678 >        lock.writeLock().lock();
1679 >        assertTrue(lock.writeLock().toString().contains("Locked by"));
1680 >        lock.writeLock().unlock();
1681 >        assertTrue(lock.writeLock().toString().contains("Unlocked"));
1682      }
112    
1683  
1684   }

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