Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 1 | /* |
| 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 | package jsr166; |
| 10 | |
| 11 | import junit.framework.*; |
| 12 | import java.util.*; |
| 13 | import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 14 | import java.util.concurrent.locks.AbstractQueuedSynchronizer; |
| 15 | import java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject; |
| 16 | |
| 17 | public class AbstractQueuedSynchronizerTest extends JSR166TestCase { |
| 18 | |
| 19 | /** |
| 20 | * A simple mutex class, adapted from the class javadoc. Exclusive |
| 21 | * acquire tests exercise this as a sample user extension. Other |
| 22 | * methods/features of AbstractQueuedSynchronizer are tested via |
| 23 | * other test classes, including those for ReentrantLock, |
| 24 | * ReentrantReadWriteLock, and Semaphore. |
| 25 | */ |
| 26 | static class Mutex extends AbstractQueuedSynchronizer { |
| 27 | /** An eccentric value for locked synchronizer state. */ |
| 28 | static final int LOCKED = (1 << 31) | (1 << 15); |
| 29 | |
| 30 | static final int UNLOCKED = 0; |
| 31 | |
| 32 | @Override public boolean isHeldExclusively() { |
| 33 | int state = getState(); |
| 34 | assertTrue(state == UNLOCKED || state == LOCKED); |
| 35 | return state == LOCKED; |
| 36 | } |
| 37 | |
| 38 | @Override public boolean tryAcquire(int acquires) { |
| 39 | assertEquals(LOCKED, acquires); |
| 40 | return compareAndSetState(UNLOCKED, LOCKED); |
| 41 | } |
| 42 | |
| 43 | @Override public boolean tryRelease(int releases) { |
| 44 | if (getState() != LOCKED) throw new IllegalMonitorStateException(); |
| 45 | assertEquals(LOCKED, releases); |
| 46 | setState(UNLOCKED); |
| 47 | return true; |
| 48 | } |
| 49 | |
| 50 | public boolean tryAcquireNanos(long nanos) throws InterruptedException { |
| 51 | return tryAcquireNanos(LOCKED, nanos); |
| 52 | } |
| 53 | |
| 54 | public boolean tryAcquire() { |
| 55 | return tryAcquire(LOCKED); |
| 56 | } |
| 57 | |
| 58 | public boolean tryRelease() { |
| 59 | return tryRelease(LOCKED); |
| 60 | } |
| 61 | |
| 62 | public void acquire() { |
| 63 | acquire(LOCKED); |
| 64 | } |
| 65 | |
| 66 | public void acquireInterruptibly() throws InterruptedException { |
| 67 | acquireInterruptibly(LOCKED); |
| 68 | } |
| 69 | |
| 70 | public void release() { |
| 71 | release(LOCKED); |
| 72 | } |
| 73 | |
| 74 | public ConditionObject newCondition() { |
| 75 | return new ConditionObject(); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * A simple latch class, to test shared mode. |
| 81 | */ |
| 82 | static class BooleanLatch extends AbstractQueuedSynchronizer { |
| 83 | public boolean isSignalled() { return getState() != 0; } |
| 84 | |
| 85 | public int tryAcquireShared(int ignore) { |
| 86 | return isSignalled() ? 1 : -1; |
| 87 | } |
| 88 | |
| 89 | public boolean tryReleaseShared(int ignore) { |
| 90 | setState(1); |
| 91 | return true; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * A runnable calling acquireInterruptibly that does not expect to |
| 97 | * be interrupted. |
| 98 | */ |
| 99 | class InterruptibleSyncRunnable extends CheckedRunnable { |
| 100 | final Mutex sync; |
| 101 | InterruptibleSyncRunnable(Mutex sync) { this.sync = sync; } |
| 102 | public void realRun() throws InterruptedException { |
| 103 | sync.acquireInterruptibly(); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * A runnable calling acquireInterruptibly that expects to be |
| 109 | * interrupted. |
| 110 | */ |
| 111 | class InterruptedSyncRunnable extends CheckedInterruptedRunnable { |
| 112 | final Mutex sync; |
| 113 | InterruptedSyncRunnable(Mutex sync) { this.sync = sync; } |
| 114 | public void realRun() throws InterruptedException { |
| 115 | sync.acquireInterruptibly(); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | /** A constant to clarify calls to checking methods below. */ |
| 120 | static final Thread[] NO_THREADS = new Thread[0]; |
| 121 | |
| 122 | /** |
| 123 | * Spin-waits until sync.isQueued(t) becomes true. |
| 124 | */ |
| 125 | void waitForQueuedThread(AbstractQueuedSynchronizer sync, Thread t) { |
| 126 | long startTime = System.nanoTime(); |
| 127 | while (!sync.isQueued(t)) { |
| 128 | if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
| 129 | throw new AssertionFailedError("timed out"); |
| 130 | Thread.yield(); |
| 131 | } |
| 132 | assertTrue(t.isAlive()); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Checks that sync has exactly the given queued threads. |
| 137 | */ |
| 138 | void assertHasQueuedThreads(AbstractQueuedSynchronizer sync, |
| 139 | Thread... expected) { |
| 140 | Collection<Thread> actual = sync.getQueuedThreads(); |
| 141 | assertEquals(expected.length > 0, sync.hasQueuedThreads()); |
| 142 | assertEquals(expected.length, sync.getQueueLength()); |
| 143 | assertEquals(expected.length, actual.size()); |
| 144 | assertEquals(expected.length == 0, actual.isEmpty()); |
| 145 | assertEquals(new HashSet<Thread>(actual), |
| 146 | new HashSet<Thread>(Arrays.asList(expected))); |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Checks that sync has exactly the given (exclusive) queued threads. |
| 151 | */ |
| 152 | void assertHasExclusiveQueuedThreads(AbstractQueuedSynchronizer sync, |
| 153 | Thread... expected) { |
| 154 | assertHasQueuedThreads(sync, expected); |
| 155 | assertEquals(new HashSet<Thread>(sync.getExclusiveQueuedThreads()), |
| 156 | new HashSet<Thread>(sync.getQueuedThreads())); |
| 157 | assertEquals(0, sync.getSharedQueuedThreads().size()); |
| 158 | assertTrue(sync.getSharedQueuedThreads().isEmpty()); |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Checks that sync has exactly the given (shared) queued threads. |
| 163 | */ |
| 164 | void assertHasSharedQueuedThreads(AbstractQueuedSynchronizer sync, |
| 165 | Thread... expected) { |
| 166 | assertHasQueuedThreads(sync, expected); |
| 167 | assertEquals(new HashSet<Thread>(sync.getSharedQueuedThreads()), |
| 168 | new HashSet<Thread>(sync.getQueuedThreads())); |
| 169 | assertEquals(0, sync.getExclusiveQueuedThreads().size()); |
| 170 | assertTrue(sync.getExclusiveQueuedThreads().isEmpty()); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Checks that condition c has exactly the given waiter threads, |
| 175 | * after acquiring mutex. |
| 176 | */ |
| 177 | void assertHasWaitersUnlocked(Mutex sync, ConditionObject c, |
| 178 | Thread... threads) { |
| 179 | sync.acquire(); |
| 180 | assertHasWaitersLocked(sync, c, threads); |
| 181 | sync.release(); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Checks that condition c has exactly the given waiter threads. |
| 186 | */ |
| 187 | void assertHasWaitersLocked(Mutex sync, ConditionObject c, |
| 188 | Thread... threads) { |
| 189 | assertEquals(threads.length > 0, sync.hasWaiters(c)); |
| 190 | assertEquals(threads.length, sync.getWaitQueueLength(c)); |
| 191 | assertEquals(threads.length == 0, sync.getWaitingThreads(c).isEmpty()); |
| 192 | assertEquals(threads.length, sync.getWaitingThreads(c).size()); |
| 193 | assertEquals(new HashSet<Thread>(sync.getWaitingThreads(c)), |
| 194 | new HashSet<Thread>(Arrays.asList(threads))); |
| 195 | } |
| 196 | |
| 197 | enum AwaitMethod { await, awaitTimed, awaitNanos, awaitUntil }; |
| 198 | |
| 199 | /** |
| 200 | * Awaits condition using the specified AwaitMethod. |
| 201 | */ |
| 202 | void await(ConditionObject c, AwaitMethod awaitMethod) |
| 203 | throws InterruptedException { |
| 204 | long timeoutMillis = 2 * LONG_DELAY_MS; |
| 205 | switch (awaitMethod) { |
| 206 | case await: |
| 207 | c.await(); |
| 208 | break; |
| 209 | case awaitTimed: |
| 210 | assertTrue(c.await(timeoutMillis, MILLISECONDS)); |
| 211 | break; |
| 212 | case awaitNanos: |
| 213 | long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis); |
| 214 | long nanosRemaining = c.awaitNanos(nanosTimeout); |
| 215 | assertTrue(nanosRemaining > 0); |
| 216 | break; |
| 217 | case awaitUntil: |
| 218 | assertTrue(c.awaitUntil(delayedDate(timeoutMillis))); |
| 219 | break; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Checks that awaiting the given condition times out (using the |
| 225 | * default timeout duration). |
| 226 | */ |
| 227 | void assertAwaitTimesOut(ConditionObject c, AwaitMethod awaitMethod) { |
| 228 | long timeoutMillis = timeoutMillis(); |
| 229 | long startTime = System.nanoTime(); |
| 230 | try { |
| 231 | switch (awaitMethod) { |
| 232 | case awaitTimed: |
| 233 | assertFalse(c.await(timeoutMillis, MILLISECONDS)); |
| 234 | break; |
| 235 | case awaitNanos: |
| 236 | long nanosTimeout = MILLISECONDS.toNanos(timeoutMillis); |
| 237 | long nanosRemaining = c.awaitNanos(nanosTimeout); |
| 238 | assertTrue(nanosRemaining <= 0); |
| 239 | break; |
| 240 | case awaitUntil: |
| 241 | assertFalse(c.awaitUntil(delayedDate(timeoutMillis))); |
| 242 | break; |
| 243 | default: |
| 244 | throw new UnsupportedOperationException(); |
| 245 | } |
| 246 | } catch (InterruptedException ie) { threadUnexpectedException(ie); } |
| 247 | assertTrue(millisElapsedSince(startTime) >= timeoutMillis); |
| 248 | } |
| 249 | |
| 250 | /** |
| 251 | * isHeldExclusively is false upon construction |
| 252 | */ |
| 253 | public void testIsHeldExclusively() { |
| 254 | Mutex sync = new Mutex(); |
| 255 | assertFalse(sync.isHeldExclusively()); |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * acquiring released sync succeeds |
| 260 | */ |
| 261 | public void testAcquire() { |
| 262 | Mutex sync = new Mutex(); |
| 263 | sync.acquire(); |
| 264 | assertTrue(sync.isHeldExclusively()); |
| 265 | sync.release(); |
| 266 | assertFalse(sync.isHeldExclusively()); |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * tryAcquire on a released sync succeeds |
| 271 | */ |
| 272 | public void testTryAcquire() { |
| 273 | Mutex sync = new Mutex(); |
| 274 | assertTrue(sync.tryAcquire()); |
| 275 | assertTrue(sync.isHeldExclusively()); |
| 276 | sync.release(); |
| 277 | assertFalse(sync.isHeldExclusively()); |
| 278 | } |
| 279 | |
| 280 | /** |
| 281 | * hasQueuedThreads reports whether there are waiting threads |
| 282 | */ |
| 283 | public void testHasQueuedThreads() { |
| 284 | final Mutex sync = new Mutex(); |
| 285 | assertFalse(sync.hasQueuedThreads()); |
| 286 | sync.acquire(); |
| 287 | Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync)); |
| 288 | waitForQueuedThread(sync, t1); |
| 289 | assertTrue(sync.hasQueuedThreads()); |
| 290 | Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync)); |
| 291 | waitForQueuedThread(sync, t2); |
| 292 | assertTrue(sync.hasQueuedThreads()); |
| 293 | t1.interrupt(); |
| 294 | awaitTermination(t1); |
| 295 | assertTrue(sync.hasQueuedThreads()); |
| 296 | sync.release(); |
| 297 | awaitTermination(t2); |
| 298 | assertFalse(sync.hasQueuedThreads()); |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * isQueued(null) throws NullPointerException |
| 303 | */ |
| 304 | public void testIsQueuedNPE() { |
| 305 | final Mutex sync = new Mutex(); |
| 306 | try { |
| 307 | sync.isQueued(null); |
| 308 | shouldThrow(); |
| 309 | } catch (NullPointerException success) {} |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * isQueued reports whether a thread is queued |
| 314 | */ |
| 315 | public void testIsQueued() { |
| 316 | final Mutex sync = new Mutex(); |
| 317 | Thread t1 = new Thread(new InterruptedSyncRunnable(sync)); |
| 318 | Thread t2 = new Thread(new InterruptibleSyncRunnable(sync)); |
| 319 | assertFalse(sync.isQueued(t1)); |
| 320 | assertFalse(sync.isQueued(t2)); |
| 321 | sync.acquire(); |
| 322 | t1.start(); |
| 323 | waitForQueuedThread(sync, t1); |
| 324 | assertTrue(sync.isQueued(t1)); |
| 325 | assertFalse(sync.isQueued(t2)); |
| 326 | t2.start(); |
| 327 | waitForQueuedThread(sync, t2); |
| 328 | assertTrue(sync.isQueued(t1)); |
| 329 | assertTrue(sync.isQueued(t2)); |
| 330 | t1.interrupt(); |
| 331 | awaitTermination(t1); |
| 332 | assertFalse(sync.isQueued(t1)); |
| 333 | assertTrue(sync.isQueued(t2)); |
| 334 | sync.release(); |
| 335 | awaitTermination(t2); |
| 336 | assertFalse(sync.isQueued(t1)); |
| 337 | assertFalse(sync.isQueued(t2)); |
| 338 | } |
| 339 | |
| 340 | /** |
| 341 | * getFirstQueuedThread returns first waiting thread or null if none |
| 342 | */ |
| 343 | public void testGetFirstQueuedThread() { |
| 344 | final Mutex sync = new Mutex(); |
| 345 | assertNull(sync.getFirstQueuedThread()); |
| 346 | sync.acquire(); |
| 347 | Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync)); |
| 348 | waitForQueuedThread(sync, t1); |
| 349 | assertEquals(t1, sync.getFirstQueuedThread()); |
| 350 | Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync)); |
| 351 | waitForQueuedThread(sync, t2); |
| 352 | assertEquals(t1, sync.getFirstQueuedThread()); |
| 353 | t1.interrupt(); |
| 354 | awaitTermination(t1); |
| 355 | assertEquals(t2, sync.getFirstQueuedThread()); |
| 356 | sync.release(); |
| 357 | awaitTermination(t2); |
| 358 | assertNull(sync.getFirstQueuedThread()); |
| 359 | } |
| 360 | |
| 361 | /** |
| 362 | * hasContended reports false if no thread has ever blocked, else true |
| 363 | */ |
| 364 | public void testHasContended() { |
| 365 | final Mutex sync = new Mutex(); |
| 366 | assertFalse(sync.hasContended()); |
| 367 | sync.acquire(); |
| 368 | assertFalse(sync.hasContended()); |
| 369 | Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync)); |
| 370 | waitForQueuedThread(sync, t1); |
| 371 | assertTrue(sync.hasContended()); |
| 372 | Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync)); |
| 373 | waitForQueuedThread(sync, t2); |
| 374 | assertTrue(sync.hasContended()); |
| 375 | t1.interrupt(); |
| 376 | awaitTermination(t1); |
| 377 | assertTrue(sync.hasContended()); |
| 378 | sync.release(); |
| 379 | awaitTermination(t2); |
| 380 | assertTrue(sync.hasContended()); |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * getQueuedThreads returns all waiting threads |
| 385 | */ |
| 386 | public void testGetQueuedThreads() { |
| 387 | final Mutex sync = new Mutex(); |
| 388 | Thread t1 = new Thread(new InterruptedSyncRunnable(sync)); |
| 389 | Thread t2 = new Thread(new InterruptibleSyncRunnable(sync)); |
| 390 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 391 | sync.acquire(); |
| 392 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 393 | t1.start(); |
| 394 | waitForQueuedThread(sync, t1); |
| 395 | assertHasExclusiveQueuedThreads(sync, t1); |
| 396 | assertTrue(sync.getQueuedThreads().contains(t1)); |
| 397 | assertFalse(sync.getQueuedThreads().contains(t2)); |
| 398 | t2.start(); |
| 399 | waitForQueuedThread(sync, t2); |
| 400 | assertHasExclusiveQueuedThreads(sync, t1, t2); |
| 401 | assertTrue(sync.getQueuedThreads().contains(t1)); |
| 402 | assertTrue(sync.getQueuedThreads().contains(t2)); |
| 403 | t1.interrupt(); |
| 404 | awaitTermination(t1); |
| 405 | assertHasExclusiveQueuedThreads(sync, t2); |
| 406 | sync.release(); |
| 407 | awaitTermination(t2); |
| 408 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * getExclusiveQueuedThreads returns all exclusive waiting threads |
| 413 | */ |
| 414 | public void testGetExclusiveQueuedThreads() { |
| 415 | final Mutex sync = new Mutex(); |
| 416 | Thread t1 = new Thread(new InterruptedSyncRunnable(sync)); |
| 417 | Thread t2 = new Thread(new InterruptibleSyncRunnable(sync)); |
| 418 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 419 | sync.acquire(); |
| 420 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 421 | t1.start(); |
| 422 | waitForQueuedThread(sync, t1); |
| 423 | assertHasExclusiveQueuedThreads(sync, t1); |
| 424 | assertTrue(sync.getExclusiveQueuedThreads().contains(t1)); |
| 425 | assertFalse(sync.getExclusiveQueuedThreads().contains(t2)); |
| 426 | t2.start(); |
| 427 | waitForQueuedThread(sync, t2); |
| 428 | assertHasExclusiveQueuedThreads(sync, t1, t2); |
| 429 | assertTrue(sync.getExclusiveQueuedThreads().contains(t1)); |
| 430 | assertTrue(sync.getExclusiveQueuedThreads().contains(t2)); |
| 431 | t1.interrupt(); |
| 432 | awaitTermination(t1); |
| 433 | assertHasExclusiveQueuedThreads(sync, t2); |
| 434 | sync.release(); |
| 435 | awaitTermination(t2); |
| 436 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * getSharedQueuedThreads does not include exclusively waiting threads |
| 441 | */ |
| 442 | public void testGetSharedQueuedThreads_Exclusive() { |
| 443 | final Mutex sync = new Mutex(); |
| 444 | assertTrue(sync.getSharedQueuedThreads().isEmpty()); |
| 445 | sync.acquire(); |
| 446 | assertTrue(sync.getSharedQueuedThreads().isEmpty()); |
| 447 | Thread t1 = newStartedThread(new InterruptedSyncRunnable(sync)); |
| 448 | waitForQueuedThread(sync, t1); |
| 449 | assertTrue(sync.getSharedQueuedThreads().isEmpty()); |
| 450 | Thread t2 = newStartedThread(new InterruptibleSyncRunnable(sync)); |
| 451 | waitForQueuedThread(sync, t2); |
| 452 | assertTrue(sync.getSharedQueuedThreads().isEmpty()); |
| 453 | t1.interrupt(); |
| 454 | awaitTermination(t1); |
| 455 | assertTrue(sync.getSharedQueuedThreads().isEmpty()); |
| 456 | sync.release(); |
| 457 | awaitTermination(t2); |
| 458 | assertTrue(sync.getSharedQueuedThreads().isEmpty()); |
| 459 | } |
| 460 | |
| 461 | /** |
| 462 | * getSharedQueuedThreads returns all shared waiting threads |
| 463 | */ |
| 464 | public void testGetSharedQueuedThreads_Shared() { |
| 465 | final BooleanLatch l = new BooleanLatch(); |
| 466 | assertHasSharedQueuedThreads(l, NO_THREADS); |
| 467 | Thread t1 = newStartedThread(new CheckedInterruptedRunnable() { |
| 468 | public void realRun() throws InterruptedException { |
| 469 | l.acquireSharedInterruptibly(0); |
| 470 | }}); |
| 471 | waitForQueuedThread(l, t1); |
| 472 | assertHasSharedQueuedThreads(l, t1); |
| 473 | Thread t2 = newStartedThread(new CheckedRunnable() { |
| 474 | public void realRun() throws InterruptedException { |
| 475 | l.acquireSharedInterruptibly(0); |
| 476 | }}); |
| 477 | waitForQueuedThread(l, t2); |
| 478 | assertHasSharedQueuedThreads(l, t1, t2); |
| 479 | t1.interrupt(); |
| 480 | awaitTermination(t1); |
| 481 | assertHasSharedQueuedThreads(l, t2); |
| 482 | assertTrue(l.releaseShared(0)); |
| 483 | awaitTermination(t2); |
| 484 | assertHasSharedQueuedThreads(l, NO_THREADS); |
| 485 | } |
| 486 | |
| 487 | /** |
| 488 | * tryAcquireNanos is interruptible |
| 489 | */ |
| 490 | public void testTryAcquireNanos_Interruptible() { |
| 491 | final Mutex sync = new Mutex(); |
| 492 | sync.acquire(); |
| 493 | Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| 494 | public void realRun() throws InterruptedException { |
| 495 | sync.tryAcquireNanos(MILLISECONDS.toNanos(2 * LONG_DELAY_MS)); |
| 496 | }}); |
| 497 | |
| 498 | waitForQueuedThread(sync, t); |
| 499 | t.interrupt(); |
| 500 | awaitTermination(t); |
| 501 | } |
| 502 | |
| 503 | /** |
| 504 | * tryAcquire on exclusively held sync fails |
| 505 | */ |
| 506 | public void testTryAcquireWhenSynced() { |
| 507 | final Mutex sync = new Mutex(); |
| 508 | sync.acquire(); |
| 509 | Thread t = newStartedThread(new CheckedRunnable() { |
| 510 | public void realRun() { |
| 511 | assertFalse(sync.tryAcquire()); |
| 512 | }}); |
| 513 | |
| 514 | awaitTermination(t); |
| 515 | sync.release(); |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * tryAcquireNanos on an exclusively held sync times out |
| 520 | */ |
| 521 | public void testAcquireNanos_Timeout() { |
| 522 | final Mutex sync = new Mutex(); |
| 523 | sync.acquire(); |
| 524 | Thread t = newStartedThread(new CheckedRunnable() { |
| 525 | public void realRun() throws InterruptedException { |
| 526 | long startTime = System.nanoTime(); |
| 527 | long nanos = MILLISECONDS.toNanos(timeoutMillis()); |
| 528 | assertFalse(sync.tryAcquireNanos(nanos)); |
| 529 | assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
| 530 | }}); |
| 531 | |
| 532 | awaitTermination(t); |
| 533 | sync.release(); |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * getState is true when acquired and false when not |
| 538 | */ |
| 539 | public void testGetState() { |
| 540 | final Mutex sync = new Mutex(); |
| 541 | sync.acquire(); |
| 542 | assertTrue(sync.isHeldExclusively()); |
| 543 | sync.release(); |
| 544 | assertFalse(sync.isHeldExclusively()); |
| 545 | |
| 546 | final BooleanLatch acquired = new BooleanLatch(); |
| 547 | final BooleanLatch done = new BooleanLatch(); |
| 548 | Thread t = newStartedThread(new CheckedRunnable() { |
| 549 | public void realRun() throws InterruptedException { |
| 550 | sync.acquire(); |
| 551 | assertTrue(acquired.releaseShared(0)); |
| 552 | done.acquireShared(0); |
| 553 | sync.release(); |
| 554 | }}); |
| 555 | |
| 556 | acquired.acquireShared(0); |
| 557 | assertTrue(sync.isHeldExclusively()); |
| 558 | assertTrue(done.releaseShared(0)); |
| 559 | awaitTermination(t); |
| 560 | assertFalse(sync.isHeldExclusively()); |
| 561 | } |
| 562 | |
| 563 | /** |
| 564 | * acquireInterruptibly succeeds when released, else is interruptible |
| 565 | */ |
| 566 | public void testAcquireInterruptibly() throws InterruptedException { |
| 567 | final Mutex sync = new Mutex(); |
| 568 | final BooleanLatch threadStarted = new BooleanLatch(); |
| 569 | sync.acquireInterruptibly(); |
| 570 | Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| 571 | public void realRun() throws InterruptedException { |
| 572 | assertTrue(threadStarted.releaseShared(0)); |
| 573 | sync.acquireInterruptibly(); |
| 574 | }}); |
| 575 | |
| 576 | threadStarted.acquireShared(0); |
| 577 | waitForQueuedThread(sync, t); |
| 578 | t.interrupt(); |
| 579 | awaitTermination(t); |
| 580 | assertTrue(sync.isHeldExclusively()); |
| 581 | } |
| 582 | |
| 583 | /** |
| 584 | * owns is true for a condition created by sync else false |
| 585 | */ |
| 586 | public void testOwns() { |
| 587 | final Mutex sync = new Mutex(); |
| 588 | final ConditionObject c = sync.newCondition(); |
| 589 | final Mutex sync2 = new Mutex(); |
| 590 | assertTrue(sync.owns(c)); |
| 591 | assertFalse(sync2.owns(c)); |
| 592 | } |
| 593 | |
| 594 | /** |
| 595 | * Calling await without holding sync throws IllegalMonitorStateException |
| 596 | */ |
| 597 | public void testAwait_IMSE() { |
| 598 | final Mutex sync = new Mutex(); |
| 599 | final ConditionObject c = sync.newCondition(); |
| 600 | for (AwaitMethod awaitMethod : AwaitMethod.values()) { |
| 601 | long startTime = System.nanoTime(); |
| 602 | try { |
| 603 | await(c, awaitMethod); |
| 604 | shouldThrow(); |
| 605 | } catch (IllegalMonitorStateException success) { |
| 606 | } catch (InterruptedException e) { threadUnexpectedException(e); } |
| 607 | assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | /** |
| 612 | * Calling signal without holding sync throws IllegalMonitorStateException |
| 613 | */ |
| 614 | public void testSignal_IMSE() { |
| 615 | final Mutex sync = new Mutex(); |
| 616 | final ConditionObject c = sync.newCondition(); |
| 617 | try { |
| 618 | c.signal(); |
| 619 | shouldThrow(); |
| 620 | } catch (IllegalMonitorStateException success) {} |
| 621 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 622 | } |
| 623 | |
| 624 | /** |
| 625 | * Calling signalAll without holding sync throws IllegalMonitorStateException |
| 626 | */ |
| 627 | public void testSignalAll_IMSE() { |
| 628 | final Mutex sync = new Mutex(); |
| 629 | final ConditionObject c = sync.newCondition(); |
| 630 | try { |
| 631 | c.signalAll(); |
| 632 | shouldThrow(); |
| 633 | } catch (IllegalMonitorStateException success) {} |
| 634 | } |
| 635 | |
| 636 | /** |
| 637 | * await/awaitNanos/awaitUntil without a signal times out |
| 638 | */ |
| 639 | public void testAwaitTimed_Timeout() { testAwait_Timeout(AwaitMethod.awaitTimed); } |
| 640 | public void testAwaitNanos_Timeout() { testAwait_Timeout(AwaitMethod.awaitNanos); } |
| 641 | public void testAwaitUntil_Timeout() { testAwait_Timeout(AwaitMethod.awaitUntil); } |
| 642 | public void testAwait_Timeout(AwaitMethod awaitMethod) { |
| 643 | final Mutex sync = new Mutex(); |
| 644 | final ConditionObject c = sync.newCondition(); |
| 645 | sync.acquire(); |
| 646 | assertAwaitTimesOut(c, awaitMethod); |
| 647 | sync.release(); |
| 648 | } |
| 649 | |
| 650 | /** |
| 651 | * await/awaitNanos/awaitUntil returns when signalled |
| 652 | */ |
| 653 | public void testSignal_await() { testSignal(AwaitMethod.await); } |
| 654 | public void testSignal_awaitTimed() { testSignal(AwaitMethod.awaitTimed); } |
| 655 | public void testSignal_awaitNanos() { testSignal(AwaitMethod.awaitNanos); } |
| 656 | public void testSignal_awaitUntil() { testSignal(AwaitMethod.awaitUntil); } |
| 657 | public void testSignal(final AwaitMethod awaitMethod) { |
| 658 | final Mutex sync = new Mutex(); |
| 659 | final ConditionObject c = sync.newCondition(); |
| 660 | final BooleanLatch acquired = new BooleanLatch(); |
| 661 | Thread t = newStartedThread(new CheckedRunnable() { |
| 662 | public void realRun() throws InterruptedException { |
| 663 | sync.acquire(); |
| 664 | assertTrue(acquired.releaseShared(0)); |
| 665 | await(c, awaitMethod); |
| 666 | sync.release(); |
| 667 | }}); |
| 668 | |
| 669 | acquired.acquireShared(0); |
| 670 | sync.acquire(); |
| 671 | assertHasWaitersLocked(sync, c, t); |
| 672 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 673 | c.signal(); |
| 674 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 675 | assertHasExclusiveQueuedThreads(sync, t); |
| 676 | sync.release(); |
| 677 | awaitTermination(t); |
| 678 | } |
| 679 | |
| 680 | /** |
| 681 | * hasWaiters(null) throws NullPointerException |
| 682 | */ |
| 683 | public void testHasWaitersNPE() { |
| 684 | final Mutex sync = new Mutex(); |
| 685 | try { |
| 686 | sync.hasWaiters(null); |
| 687 | shouldThrow(); |
| 688 | } catch (NullPointerException success) {} |
| 689 | } |
| 690 | |
| 691 | /** |
| 692 | * getWaitQueueLength(null) throws NullPointerException |
| 693 | */ |
| 694 | public void testGetWaitQueueLengthNPE() { |
| 695 | final Mutex sync = new Mutex(); |
| 696 | try { |
| 697 | sync.getWaitQueueLength(null); |
| 698 | shouldThrow(); |
| 699 | } catch (NullPointerException success) {} |
| 700 | } |
| 701 | |
| 702 | /** |
| 703 | * getWaitingThreads(null) throws NullPointerException |
| 704 | */ |
| 705 | public void testGetWaitingThreadsNPE() { |
| 706 | final Mutex sync = new Mutex(); |
| 707 | try { |
| 708 | sync.getWaitingThreads(null); |
| 709 | shouldThrow(); |
| 710 | } catch (NullPointerException success) {} |
| 711 | } |
| 712 | |
| 713 | /** |
| 714 | * hasWaiters throws IllegalArgumentException if not owned |
| 715 | */ |
| 716 | public void testHasWaitersIAE() { |
| 717 | final Mutex sync = new Mutex(); |
| 718 | final ConditionObject c = sync.newCondition(); |
| 719 | final Mutex sync2 = new Mutex(); |
| 720 | try { |
| 721 | sync2.hasWaiters(c); |
| 722 | shouldThrow(); |
| 723 | } catch (IllegalArgumentException success) {} |
| 724 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 725 | } |
| 726 | |
| 727 | /** |
| 728 | * hasWaiters throws IllegalMonitorStateException if not synced |
| 729 | */ |
| 730 | public void testHasWaitersIMSE() { |
| 731 | final Mutex sync = new Mutex(); |
| 732 | final ConditionObject c = sync.newCondition(); |
| 733 | try { |
| 734 | sync.hasWaiters(c); |
| 735 | shouldThrow(); |
| 736 | } catch (IllegalMonitorStateException success) {} |
| 737 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 738 | } |
| 739 | |
| 740 | /** |
| 741 | * getWaitQueueLength throws IllegalArgumentException if not owned |
| 742 | */ |
| 743 | public void testGetWaitQueueLengthIAE() { |
| 744 | final Mutex sync = new Mutex(); |
| 745 | final ConditionObject c = sync.newCondition(); |
| 746 | final Mutex sync2 = new Mutex(); |
| 747 | try { |
| 748 | sync2.getWaitQueueLength(c); |
| 749 | shouldThrow(); |
| 750 | } catch (IllegalArgumentException success) {} |
| 751 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 752 | } |
| 753 | |
| 754 | /** |
| 755 | * getWaitQueueLength throws IllegalMonitorStateException if not synced |
| 756 | */ |
| 757 | public void testGetWaitQueueLengthIMSE() { |
| 758 | final Mutex sync = new Mutex(); |
| 759 | final ConditionObject c = sync.newCondition(); |
| 760 | try { |
| 761 | sync.getWaitQueueLength(c); |
| 762 | shouldThrow(); |
| 763 | } catch (IllegalMonitorStateException success) {} |
| 764 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 765 | } |
| 766 | |
| 767 | /** |
| 768 | * getWaitingThreads throws IllegalArgumentException if not owned |
| 769 | */ |
| 770 | public void testGetWaitingThreadsIAE() { |
| 771 | final Mutex sync = new Mutex(); |
| 772 | final ConditionObject c = sync.newCondition(); |
| 773 | final Mutex sync2 = new Mutex(); |
| 774 | try { |
| 775 | sync2.getWaitingThreads(c); |
| 776 | shouldThrow(); |
| 777 | } catch (IllegalArgumentException success) {} |
| 778 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 779 | } |
| 780 | |
| 781 | /** |
| 782 | * getWaitingThreads throws IllegalMonitorStateException if not synced |
| 783 | */ |
| 784 | public void testGetWaitingThreadsIMSE() { |
| 785 | final Mutex sync = new Mutex(); |
| 786 | final ConditionObject c = sync.newCondition(); |
| 787 | try { |
| 788 | sync.getWaitingThreads(c); |
| 789 | shouldThrow(); |
| 790 | } catch (IllegalMonitorStateException success) {} |
| 791 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 792 | } |
| 793 | |
| 794 | /** |
| 795 | * hasWaiters returns true when a thread is waiting, else false |
| 796 | */ |
| 797 | public void testHasWaiters() { |
| 798 | final Mutex sync = new Mutex(); |
| 799 | final ConditionObject c = sync.newCondition(); |
| 800 | final BooleanLatch acquired = new BooleanLatch(); |
| 801 | Thread t = newStartedThread(new CheckedRunnable() { |
| 802 | public void realRun() throws InterruptedException { |
| 803 | sync.acquire(); |
| 804 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 805 | assertFalse(sync.hasWaiters(c)); |
| 806 | assertTrue(acquired.releaseShared(0)); |
| 807 | c.await(); |
| 808 | sync.release(); |
| 809 | }}); |
| 810 | |
| 811 | acquired.acquireShared(0); |
| 812 | sync.acquire(); |
| 813 | assertHasWaitersLocked(sync, c, t); |
| 814 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 815 | assertTrue(sync.hasWaiters(c)); |
| 816 | c.signal(); |
| 817 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 818 | assertHasExclusiveQueuedThreads(sync, t); |
| 819 | assertFalse(sync.hasWaiters(c)); |
| 820 | sync.release(); |
| 821 | |
| 822 | awaitTermination(t); |
| 823 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 824 | } |
| 825 | |
| 826 | /** |
| 827 | * getWaitQueueLength returns number of waiting threads |
| 828 | */ |
| 829 | public void testGetWaitQueueLength() { |
| 830 | final Mutex sync = new Mutex(); |
| 831 | final ConditionObject c = sync.newCondition(); |
| 832 | final BooleanLatch acquired1 = new BooleanLatch(); |
| 833 | final BooleanLatch acquired2 = new BooleanLatch(); |
| 834 | final Thread t1 = newStartedThread(new CheckedRunnable() { |
| 835 | public void realRun() throws InterruptedException { |
| 836 | sync.acquire(); |
| 837 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 838 | assertEquals(0, sync.getWaitQueueLength(c)); |
| 839 | assertTrue(acquired1.releaseShared(0)); |
| 840 | c.await(); |
| 841 | sync.release(); |
| 842 | }}); |
| 843 | acquired1.acquireShared(0); |
| 844 | sync.acquire(); |
| 845 | assertHasWaitersLocked(sync, c, t1); |
| 846 | assertEquals(1, sync.getWaitQueueLength(c)); |
| 847 | sync.release(); |
| 848 | |
| 849 | final Thread t2 = newStartedThread(new CheckedRunnable() { |
| 850 | public void realRun() throws InterruptedException { |
| 851 | sync.acquire(); |
| 852 | assertHasWaitersLocked(sync, c, t1); |
| 853 | assertEquals(1, sync.getWaitQueueLength(c)); |
| 854 | assertTrue(acquired2.releaseShared(0)); |
| 855 | c.await(); |
| 856 | sync.release(); |
| 857 | }}); |
| 858 | acquired2.acquireShared(0); |
| 859 | sync.acquire(); |
| 860 | assertHasWaitersLocked(sync, c, t1, t2); |
| 861 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 862 | assertEquals(2, sync.getWaitQueueLength(c)); |
| 863 | c.signalAll(); |
| 864 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 865 | assertHasExclusiveQueuedThreads(sync, t1, t2); |
| 866 | assertEquals(0, sync.getWaitQueueLength(c)); |
| 867 | sync.release(); |
| 868 | |
| 869 | awaitTermination(t1); |
| 870 | awaitTermination(t2); |
| 871 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 872 | } |
| 873 | |
| 874 | /** |
| 875 | * getWaitingThreads returns only and all waiting threads |
| 876 | */ |
| 877 | public void testGetWaitingThreads() { |
| 878 | final Mutex sync = new Mutex(); |
| 879 | final ConditionObject c = sync.newCondition(); |
| 880 | final BooleanLatch acquired1 = new BooleanLatch(); |
| 881 | final BooleanLatch acquired2 = new BooleanLatch(); |
| 882 | final Thread t1 = new Thread(new CheckedRunnable() { |
| 883 | public void realRun() throws InterruptedException { |
| 884 | sync.acquire(); |
| 885 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 886 | assertTrue(sync.getWaitingThreads(c).isEmpty()); |
| 887 | assertTrue(acquired1.releaseShared(0)); |
| 888 | c.await(); |
| 889 | sync.release(); |
| 890 | }}); |
| 891 | |
| 892 | final Thread t2 = new Thread(new CheckedRunnable() { |
| 893 | public void realRun() throws InterruptedException { |
| 894 | sync.acquire(); |
| 895 | assertHasWaitersLocked(sync, c, t1); |
| 896 | assertTrue(sync.getWaitingThreads(c).contains(t1)); |
| 897 | assertFalse(sync.getWaitingThreads(c).isEmpty()); |
| 898 | assertEquals(1, sync.getWaitingThreads(c).size()); |
| 899 | assertTrue(acquired2.releaseShared(0)); |
| 900 | c.await(); |
| 901 | sync.release(); |
| 902 | }}); |
| 903 | |
| 904 | sync.acquire(); |
| 905 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 906 | assertFalse(sync.getWaitingThreads(c).contains(t1)); |
| 907 | assertFalse(sync.getWaitingThreads(c).contains(t2)); |
| 908 | assertTrue(sync.getWaitingThreads(c).isEmpty()); |
| 909 | assertEquals(0, sync.getWaitingThreads(c).size()); |
| 910 | sync.release(); |
| 911 | |
| 912 | t1.start(); |
| 913 | acquired1.acquireShared(0); |
| 914 | sync.acquire(); |
| 915 | assertHasWaitersLocked(sync, c, t1); |
| 916 | assertTrue(sync.getWaitingThreads(c).contains(t1)); |
| 917 | assertFalse(sync.getWaitingThreads(c).contains(t2)); |
| 918 | assertFalse(sync.getWaitingThreads(c).isEmpty()); |
| 919 | assertEquals(1, sync.getWaitingThreads(c).size()); |
| 920 | sync.release(); |
| 921 | |
| 922 | t2.start(); |
| 923 | acquired2.acquireShared(0); |
| 924 | sync.acquire(); |
| 925 | assertHasWaitersLocked(sync, c, t1, t2); |
| 926 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 927 | assertTrue(sync.getWaitingThreads(c).contains(t1)); |
| 928 | assertTrue(sync.getWaitingThreads(c).contains(t2)); |
| 929 | assertFalse(sync.getWaitingThreads(c).isEmpty()); |
| 930 | assertEquals(2, sync.getWaitingThreads(c).size()); |
| 931 | c.signalAll(); |
| 932 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 933 | assertHasExclusiveQueuedThreads(sync, t1, t2); |
| 934 | assertFalse(sync.getWaitingThreads(c).contains(t1)); |
| 935 | assertFalse(sync.getWaitingThreads(c).contains(t2)); |
| 936 | assertTrue(sync.getWaitingThreads(c).isEmpty()); |
| 937 | assertEquals(0, sync.getWaitingThreads(c).size()); |
| 938 | sync.release(); |
| 939 | |
| 940 | awaitTermination(t1); |
| 941 | awaitTermination(t2); |
| 942 | assertHasWaitersUnlocked(sync, c, NO_THREADS); |
| 943 | } |
| 944 | |
| 945 | /** |
| 946 | * awaitUninterruptibly is uninterruptible |
| 947 | */ |
| 948 | public void testAwaitUninterruptibly() { |
| 949 | final Mutex sync = new Mutex(); |
| 950 | final ConditionObject c = sync.newCondition(); |
| 951 | final BooleanLatch pleaseInterrupt = new BooleanLatch(); |
| 952 | Thread t = newStartedThread(new CheckedRunnable() { |
| 953 | public void realRun() { |
| 954 | sync.acquire(); |
| 955 | assertTrue(pleaseInterrupt.releaseShared(0)); |
| 956 | c.awaitUninterruptibly(); |
| 957 | assertTrue(Thread.interrupted()); |
| 958 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 959 | sync.release(); |
| 960 | }}); |
| 961 | |
| 962 | pleaseInterrupt.acquireShared(0); |
| 963 | sync.acquire(); |
| 964 | assertHasWaitersLocked(sync, c, t); |
| 965 | sync.release(); |
| 966 | t.interrupt(); |
| 967 | assertHasWaitersUnlocked(sync, c, t); |
| 968 | assertThreadStaysAlive(t); |
| 969 | sync.acquire(); |
| 970 | assertHasWaitersLocked(sync, c, t); |
| 971 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 972 | c.signal(); |
| 973 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 974 | assertHasExclusiveQueuedThreads(sync, t); |
| 975 | sync.release(); |
| 976 | awaitTermination(t); |
| 977 | } |
| 978 | |
| 979 | /** |
| 980 | * await/awaitNanos/awaitUntil is interruptible |
| 981 | */ |
| 982 | public void testInterruptible_await() { testInterruptible(AwaitMethod.await); } |
| 983 | public void testInterruptible_awaitTimed() { testInterruptible(AwaitMethod.awaitTimed); } |
| 984 | public void testInterruptible_awaitNanos() { testInterruptible(AwaitMethod.awaitNanos); } |
| 985 | public void testInterruptible_awaitUntil() { testInterruptible(AwaitMethod.awaitUntil); } |
| 986 | public void testInterruptible(final AwaitMethod awaitMethod) { |
| 987 | final Mutex sync = new Mutex(); |
| 988 | final ConditionObject c = sync.newCondition(); |
| 989 | final BooleanLatch pleaseInterrupt = new BooleanLatch(); |
| 990 | Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| 991 | public void realRun() throws InterruptedException { |
| 992 | sync.acquire(); |
| 993 | assertTrue(pleaseInterrupt.releaseShared(0)); |
| 994 | await(c, awaitMethod); |
| 995 | }}); |
| 996 | |
| 997 | pleaseInterrupt.acquireShared(0); |
| 998 | t.interrupt(); |
| 999 | awaitTermination(t); |
| 1000 | } |
| 1001 | |
| 1002 | /** |
| 1003 | * signalAll wakes up all threads |
| 1004 | */ |
| 1005 | public void testSignalAll_await() { testSignalAll(AwaitMethod.await); } |
| 1006 | public void testSignalAll_awaitTimed() { testSignalAll(AwaitMethod.awaitTimed); } |
| 1007 | public void testSignalAll_awaitNanos() { testSignalAll(AwaitMethod.awaitNanos); } |
| 1008 | public void testSignalAll_awaitUntil() { testSignalAll(AwaitMethod.awaitUntil); } |
| 1009 | public void testSignalAll(final AwaitMethod awaitMethod) { |
| 1010 | final Mutex sync = new Mutex(); |
| 1011 | final ConditionObject c = sync.newCondition(); |
| 1012 | final BooleanLatch acquired1 = new BooleanLatch(); |
| 1013 | final BooleanLatch acquired2 = new BooleanLatch(); |
| 1014 | Thread t1 = newStartedThread(new CheckedRunnable() { |
| 1015 | public void realRun() throws InterruptedException { |
| 1016 | sync.acquire(); |
| 1017 | acquired1.releaseShared(0); |
| 1018 | await(c, awaitMethod); |
| 1019 | sync.release(); |
| 1020 | }}); |
| 1021 | |
| 1022 | Thread t2 = newStartedThread(new CheckedRunnable() { |
| 1023 | public void realRun() throws InterruptedException { |
| 1024 | sync.acquire(); |
| 1025 | acquired2.releaseShared(0); |
| 1026 | await(c, awaitMethod); |
| 1027 | sync.release(); |
| 1028 | }}); |
| 1029 | |
| 1030 | acquired1.acquireShared(0); |
| 1031 | acquired2.acquireShared(0); |
| 1032 | sync.acquire(); |
| 1033 | assertHasWaitersLocked(sync, c, t1, t2); |
| 1034 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 1035 | c.signalAll(); |
| 1036 | assertHasWaitersLocked(sync, c, NO_THREADS); |
| 1037 | assertHasExclusiveQueuedThreads(sync, t1, t2); |
| 1038 | sync.release(); |
| 1039 | awaitTermination(t1); |
| 1040 | awaitTermination(t2); |
| 1041 | } |
| 1042 | |
| 1043 | /** |
| 1044 | * toString indicates current state |
| 1045 | */ |
| 1046 | public void testToString() { |
| 1047 | Mutex sync = new Mutex(); |
| 1048 | assertTrue(sync.toString().contains("State = " + Mutex.UNLOCKED)); |
| 1049 | sync.acquire(); |
| 1050 | assertTrue(sync.toString().contains("State = " + Mutex.LOCKED)); |
| 1051 | } |
| 1052 | |
| 1053 | /** |
| 1054 | * A serialized AQS deserializes with current state, but no queued threads |
| 1055 | */ |
| 1056 | public void testSerialization() { |
| 1057 | Mutex sync = new Mutex(); |
| 1058 | assertFalse(serialClone(sync).isHeldExclusively()); |
| 1059 | sync.acquire(); |
| 1060 | Thread t = newStartedThread(new InterruptedSyncRunnable(sync)); |
| 1061 | waitForQueuedThread(sync, t); |
| 1062 | assertTrue(sync.isHeldExclusively()); |
| 1063 | |
| 1064 | Mutex clone = serialClone(sync); |
| 1065 | assertTrue(clone.isHeldExclusively()); |
| 1066 | assertHasExclusiveQueuedThreads(sync, t); |
| 1067 | assertHasExclusiveQueuedThreads(clone, NO_THREADS); |
| 1068 | t.interrupt(); |
| 1069 | awaitTermination(t); |
| 1070 | sync.release(); |
| 1071 | assertFalse(sync.isHeldExclusively()); |
| 1072 | assertTrue(clone.isHeldExclusively()); |
| 1073 | assertHasExclusiveQueuedThreads(sync, NO_THREADS); |
| 1074 | assertHasExclusiveQueuedThreads(clone, NO_THREADS); |
| 1075 | } |
| 1076 | |
| 1077 | /** |
| 1078 | * tryReleaseShared setting state changes getState |
| 1079 | */ |
| 1080 | public void testGetStateWithReleaseShared() { |
| 1081 | final BooleanLatch l = new BooleanLatch(); |
| 1082 | assertFalse(l.isSignalled()); |
| 1083 | assertTrue(l.releaseShared(0)); |
| 1084 | assertTrue(l.isSignalled()); |
| 1085 | } |
| 1086 | |
| 1087 | /** |
| 1088 | * releaseShared has no effect when already signalled |
| 1089 | */ |
| 1090 | public void testReleaseShared() { |
| 1091 | final BooleanLatch l = new BooleanLatch(); |
| 1092 | assertFalse(l.isSignalled()); |
| 1093 | assertTrue(l.releaseShared(0)); |
| 1094 | assertTrue(l.isSignalled()); |
| 1095 | assertTrue(l.releaseShared(0)); |
| 1096 | assertTrue(l.isSignalled()); |
| 1097 | } |
| 1098 | |
| 1099 | /** |
| 1100 | * acquireSharedInterruptibly returns after release, but not before |
| 1101 | */ |
| 1102 | public void testAcquireSharedInterruptibly() { |
| 1103 | final BooleanLatch l = new BooleanLatch(); |
| 1104 | |
| 1105 | Thread t = newStartedThread(new CheckedRunnable() { |
| 1106 | public void realRun() throws InterruptedException { |
| 1107 | assertFalse(l.isSignalled()); |
| 1108 | l.acquireSharedInterruptibly(0); |
| 1109 | assertTrue(l.isSignalled()); |
| 1110 | l.acquireSharedInterruptibly(0); |
| 1111 | assertTrue(l.isSignalled()); |
| 1112 | }}); |
| 1113 | |
| 1114 | waitForQueuedThread(l, t); |
| 1115 | assertFalse(l.isSignalled()); |
| 1116 | assertThreadStaysAlive(t); |
| 1117 | assertHasSharedQueuedThreads(l, t); |
| 1118 | assertTrue(l.releaseShared(0)); |
| 1119 | assertTrue(l.isSignalled()); |
| 1120 | awaitTermination(t); |
| 1121 | } |
| 1122 | |
| 1123 | /** |
| 1124 | * tryAcquireSharedNanos returns after release, but not before |
| 1125 | */ |
| 1126 | public void testTryAcquireSharedNanos() { |
| 1127 | final BooleanLatch l = new BooleanLatch(); |
| 1128 | |
| 1129 | Thread t = newStartedThread(new CheckedRunnable() { |
| 1130 | public void realRun() throws InterruptedException { |
| 1131 | assertFalse(l.isSignalled()); |
| 1132 | long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS); |
| 1133 | assertTrue(l.tryAcquireSharedNanos(0, nanos)); |
| 1134 | assertTrue(l.isSignalled()); |
| 1135 | assertTrue(l.tryAcquireSharedNanos(0, nanos)); |
| 1136 | assertTrue(l.isSignalled()); |
| 1137 | }}); |
| 1138 | |
| 1139 | waitForQueuedThread(l, t); |
| 1140 | assertFalse(l.isSignalled()); |
| 1141 | assertThreadStaysAlive(t); |
| 1142 | assertTrue(l.releaseShared(0)); |
| 1143 | assertTrue(l.isSignalled()); |
| 1144 | awaitTermination(t); |
| 1145 | } |
| 1146 | |
| 1147 | /** |
| 1148 | * acquireSharedInterruptibly is interruptible |
| 1149 | */ |
| 1150 | public void testAcquireSharedInterruptibly_Interruptible() { |
| 1151 | final BooleanLatch l = new BooleanLatch(); |
| 1152 | Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| 1153 | public void realRun() throws InterruptedException { |
| 1154 | assertFalse(l.isSignalled()); |
| 1155 | l.acquireSharedInterruptibly(0); |
| 1156 | }}); |
| 1157 | |
| 1158 | waitForQueuedThread(l, t); |
| 1159 | assertFalse(l.isSignalled()); |
| 1160 | t.interrupt(); |
| 1161 | awaitTermination(t); |
| 1162 | assertFalse(l.isSignalled()); |
| 1163 | } |
| 1164 | |
| 1165 | /** |
| 1166 | * tryAcquireSharedNanos is interruptible |
| 1167 | */ |
| 1168 | public void testTryAcquireSharedNanos_Interruptible() { |
| 1169 | final BooleanLatch l = new BooleanLatch(); |
| 1170 | Thread t = newStartedThread(new CheckedInterruptedRunnable() { |
| 1171 | public void realRun() throws InterruptedException { |
| 1172 | assertFalse(l.isSignalled()); |
| 1173 | long nanos = MILLISECONDS.toNanos(2 * LONG_DELAY_MS); |
| 1174 | l.tryAcquireSharedNanos(0, nanos); |
| 1175 | }}); |
| 1176 | |
| 1177 | waitForQueuedThread(l, t); |
| 1178 | assertFalse(l.isSignalled()); |
| 1179 | t.interrupt(); |
| 1180 | awaitTermination(t); |
| 1181 | assertFalse(l.isSignalled()); |
| 1182 | } |
| 1183 | |
| 1184 | /** |
| 1185 | * tryAcquireSharedNanos times out if not released before timeout |
| 1186 | */ |
| 1187 | public void testTryAcquireSharedNanos_Timeout() { |
| 1188 | final BooleanLatch l = new BooleanLatch(); |
| 1189 | final BooleanLatch observedQueued = new BooleanLatch(); |
| 1190 | final long timeoutMillis = timeoutMillis(); |
| 1191 | Thread t = newStartedThread(new CheckedRunnable() { |
| 1192 | public void realRun() throws InterruptedException { |
| 1193 | assertFalse(l.isSignalled()); |
| 1194 | for (long millis = timeoutMillis(); |
| 1195 | !observedQueued.isSignalled(); |
| 1196 | millis *= 2) { |
| 1197 | long nanos = MILLISECONDS.toNanos(millis); |
| 1198 | long startTime = System.nanoTime(); |
| 1199 | assertFalse(l.tryAcquireSharedNanos(0, nanos)); |
| 1200 | assertTrue(millisElapsedSince(startTime) >= millis); |
| 1201 | } |
| 1202 | assertFalse(l.isSignalled()); |
| 1203 | }}); |
| 1204 | |
| 1205 | waitForQueuedThread(l, t); |
| 1206 | observedQueued.releaseShared(0); |
| 1207 | assertFalse(l.isSignalled()); |
| 1208 | awaitTermination(t); |
| 1209 | assertFalse(l.isSignalled()); |
| 1210 | } |
| 1211 | |
| 1212 | } |