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 John Vint |
| 6 | */ |
| 7 | |
| 8 | package jsr166; |
| 9 | |
| 10 | import junit.framework.*; |
| 11 | import java.util.ArrayList; |
| 12 | import java.util.List; |
| 13 | import java.util.concurrent.Phaser; |
| 14 | import java.util.concurrent.CountDownLatch; |
| 15 | import java.util.concurrent.TimeoutException; |
| 16 | import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 17 | import static java.util.concurrent.TimeUnit.NANOSECONDS; |
| 18 | import java.util.concurrent.atomic.AtomicBoolean; |
| 19 | import java.util.concurrent.atomic.AtomicInteger; |
| 20 | |
| 21 | public class PhaserTest extends JSR166TestCase { |
| 22 | |
| 23 | private static final int maxParties = 65535; |
| 24 | |
| 25 | /** Checks state of unterminated phaser. */ |
| 26 | protected void assertState(Phaser phaser, |
| 27 | int phase, int parties, int unarrived) { |
| 28 | assertEquals(phase, phaser.getPhase()); |
| 29 | assertEquals(parties, phaser.getRegisteredParties()); |
| 30 | assertEquals(unarrived, phaser.getUnarrivedParties()); |
| 31 | assertEquals(parties - unarrived, phaser.getArrivedParties()); |
| 32 | assertFalse(phaser.isTerminated()); |
| 33 | } |
| 34 | |
| 35 | /** Checks state of terminated phaser. */ |
| 36 | protected void assertTerminated(Phaser phaser, int maxPhase, int parties) { |
| 37 | assertTrue(phaser.isTerminated()); |
| 38 | int expectedPhase = maxPhase + Integer.MIN_VALUE; |
| 39 | assertEquals(expectedPhase, phaser.getPhase()); |
| 40 | assertEquals(parties, phaser.getRegisteredParties()); |
| 41 | assertEquals(expectedPhase, phaser.register()); |
| 42 | assertEquals(expectedPhase, phaser.arrive()); |
| 43 | assertEquals(expectedPhase, phaser.arriveAndDeregister()); |
| 44 | } |
| 45 | |
| 46 | protected void assertTerminated(Phaser phaser, int maxPhase) { |
| 47 | assertTerminated(phaser, maxPhase, 0); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Empty constructor builds a new Phaser with no parent, no registered |
| 52 | * parties and initial phase number of 0 |
| 53 | */ |
| 54 | public void testConstructorDefaultValues() { |
| 55 | Phaser phaser = new Phaser(); |
| 56 | assertNull(phaser.getParent()); |
| 57 | assertEquals(0, phaser.getRegisteredParties()); |
| 58 | assertEquals(0, phaser.getArrivedParties()); |
| 59 | assertEquals(0, phaser.getUnarrivedParties()); |
| 60 | assertEquals(0, phaser.getPhase()); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Constructing with a negative number of parties throws |
| 65 | * IllegalArgumentException |
| 66 | */ |
| 67 | public void testConstructorNegativeParties() { |
| 68 | try { |
| 69 | new Phaser(-1); |
| 70 | shouldThrow(); |
| 71 | } catch (IllegalArgumentException success) {} |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Constructing with a negative number of parties throws |
| 76 | * IllegalArgumentException |
| 77 | */ |
| 78 | public void testConstructorNegativeParties2() { |
| 79 | try { |
| 80 | new Phaser(new Phaser(), -1); |
| 81 | shouldThrow(); |
| 82 | } catch (IllegalArgumentException success) {} |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Constructing with a number of parties > 65535 throws |
| 87 | * IllegalArgumentException |
| 88 | */ |
| 89 | public void testConstructorPartiesExceedsLimit() { |
| 90 | new Phaser(maxParties); |
| 91 | try { |
| 92 | new Phaser(maxParties + 1); |
| 93 | shouldThrow(); |
| 94 | } catch (IllegalArgumentException success) {} |
| 95 | |
| 96 | new Phaser(new Phaser(), maxParties); |
| 97 | try { |
| 98 | new Phaser(new Phaser(), maxParties + 1); |
| 99 | shouldThrow(); |
| 100 | } catch (IllegalArgumentException success) {} |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * The parent provided to the constructor should be returned from |
| 105 | * a later call to getParent |
| 106 | */ |
| 107 | public void testConstructor3() { |
| 108 | Phaser parent = new Phaser(); |
| 109 | assertSame(parent, new Phaser(parent).getParent()); |
| 110 | assertNull(new Phaser(null).getParent()); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * The parent being input into the parameter should equal the original |
| 115 | * parent when being returned |
| 116 | */ |
| 117 | public void testConstructor5() { |
| 118 | Phaser parent = new Phaser(); |
| 119 | assertSame(parent, new Phaser(parent, 0).getParent()); |
| 120 | assertNull(new Phaser(null, 0).getParent()); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * register() will increment the number of unarrived parties by |
| 125 | * one and not affect its arrived parties |
| 126 | */ |
| 127 | public void testRegister1() { |
| 128 | Phaser phaser = new Phaser(); |
| 129 | assertState(phaser, 0, 0, 0); |
| 130 | assertEquals(0, phaser.register()); |
| 131 | assertState(phaser, 0, 1, 1); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Registering more than 65536 parties causes IllegalStateException |
| 136 | */ |
| 137 | public void testRegister2() { |
| 138 | Phaser phaser = new Phaser(0); |
| 139 | assertState(phaser, 0, 0, 0); |
| 140 | assertEquals(0, phaser.bulkRegister(maxParties - 10)); |
| 141 | assertState(phaser, 0, maxParties - 10, maxParties - 10); |
| 142 | for (int i = 0; i < 10; i++) { |
| 143 | assertState(phaser, 0, maxParties - 10 + i, maxParties - 10 + i); |
| 144 | assertEquals(0, phaser.register()); |
| 145 | } |
| 146 | assertState(phaser, 0, maxParties, maxParties); |
| 147 | try { |
| 148 | phaser.register(); |
| 149 | shouldThrow(); |
| 150 | } catch (IllegalStateException success) {} |
| 151 | |
| 152 | try { |
| 153 | phaser.bulkRegister(Integer.MAX_VALUE); |
| 154 | shouldThrow(); |
| 155 | } catch (IllegalStateException success) {} |
| 156 | |
| 157 | assertEquals(0, phaser.bulkRegister(0)); |
| 158 | assertState(phaser, 0, maxParties, maxParties); |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * register() correctly returns the current barrier phase number |
| 163 | * when invoked |
| 164 | */ |
| 165 | public void testRegister3() { |
| 166 | Phaser phaser = new Phaser(); |
| 167 | assertEquals(0, phaser.register()); |
| 168 | assertEquals(0, phaser.arrive()); |
| 169 | assertEquals(1, phaser.register()); |
| 170 | assertState(phaser, 1, 2, 2); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * register causes the next arrive to not increment the phase |
| 175 | * rather retain the phase number |
| 176 | */ |
| 177 | public void testRegister4() { |
| 178 | Phaser phaser = new Phaser(1); |
| 179 | assertEquals(0, phaser.arrive()); |
| 180 | assertEquals(1, phaser.register()); |
| 181 | assertEquals(1, phaser.arrive()); |
| 182 | assertState(phaser, 1, 2, 1); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * register on a subphaser that is currently empty succeeds, even |
| 187 | * in the presence of another non-empty subphaser |
| 188 | */ |
| 189 | public void testRegisterEmptySubPhaser() { |
| 190 | Phaser root = new Phaser(); |
| 191 | Phaser child1 = new Phaser(root, 1); |
| 192 | Phaser child2 = new Phaser(root, 0); |
| 193 | assertEquals(0, child2.register()); |
| 194 | assertState(root, 0, 2, 2); |
| 195 | assertState(child1, 0, 1, 1); |
| 196 | assertState(child2, 0, 1, 1); |
| 197 | assertEquals(0, child2.arriveAndDeregister()); |
| 198 | assertState(root, 0, 1, 1); |
| 199 | assertState(child1, 0, 1, 1); |
| 200 | assertState(child2, 0, 0, 0); |
| 201 | assertEquals(0, child2.register()); |
| 202 | assertEquals(0, child2.arriveAndDeregister()); |
| 203 | assertState(root, 0, 1, 1); |
| 204 | assertState(child1, 0, 1, 1); |
| 205 | assertState(child2, 0, 0, 0); |
| 206 | assertEquals(0, child1.arriveAndDeregister()); |
| 207 | assertTerminated(root, 1); |
| 208 | assertTerminated(child1, 1); |
| 209 | assertTerminated(child2, 1); |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Invoking bulkRegister with a negative parameter throws an |
| 214 | * IllegalArgumentException |
| 215 | */ |
| 216 | public void testBulkRegister1() { |
| 217 | try { |
| 218 | new Phaser().bulkRegister(-1); |
| 219 | shouldThrow(); |
| 220 | } catch (IllegalArgumentException success) {} |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * bulkRegister should correctly record the number of unarrived |
| 225 | * parties with the number of parties being registered |
| 226 | */ |
| 227 | public void testBulkRegister2() { |
| 228 | Phaser phaser = new Phaser(); |
| 229 | assertEquals(0, phaser.bulkRegister(0)); |
| 230 | assertState(phaser, 0, 0, 0); |
| 231 | assertEquals(0, phaser.bulkRegister(20)); |
| 232 | assertState(phaser, 0, 20, 20); |
| 233 | } |
| 234 | |
| 235 | /** |
| 236 | * Registering with a number of parties greater than or equal to 1<<16 |
| 237 | * throws IllegalStateException. |
| 238 | */ |
| 239 | public void testBulkRegister3() { |
| 240 | assertEquals(0, new Phaser().bulkRegister((1 << 16) - 1)); |
| 241 | |
| 242 | try { |
| 243 | new Phaser().bulkRegister(1 << 16); |
| 244 | shouldThrow(); |
| 245 | } catch (IllegalStateException success) {} |
| 246 | |
| 247 | try { |
| 248 | new Phaser(2).bulkRegister((1 << 16) - 2); |
| 249 | shouldThrow(); |
| 250 | } catch (IllegalStateException success) {} |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * the phase number increments correctly when tripping the barrier |
| 255 | */ |
| 256 | public void testPhaseIncrement1() { |
| 257 | for (int size = 1; size < nine; size++) { |
| 258 | final Phaser phaser = new Phaser(size); |
| 259 | for (int index = 0; index <= (1 << size); index++) { |
| 260 | int phase = phaser.arrive(); |
| 261 | assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0); |
| 262 | } |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * arrive() on a registered phaser increments phase. |
| 268 | */ |
| 269 | public void testArrive1() { |
| 270 | Phaser phaser = new Phaser(1); |
| 271 | assertState(phaser, 0, 1, 1); |
| 272 | assertEquals(0, phaser.arrive()); |
| 273 | assertState(phaser, 1, 1, 1); |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * arriveAndDeregister does not wait for others to arrive at barrier |
| 278 | */ |
| 279 | public void testArriveAndDeregister() { |
| 280 | final Phaser phaser = new Phaser(1); |
| 281 | for (int i = 0; i < 10; i++) { |
| 282 | assertState(phaser, 0, 1, 1); |
| 283 | assertEquals(0, phaser.register()); |
| 284 | assertState(phaser, 0, 2, 2); |
| 285 | assertEquals(0, phaser.arriveAndDeregister()); |
| 286 | assertState(phaser, 0, 1, 1); |
| 287 | } |
| 288 | assertEquals(0, phaser.arriveAndDeregister()); |
| 289 | assertTerminated(phaser, 1); |
| 290 | } |
| 291 | |
| 292 | /** |
| 293 | * arriveAndDeregister does not wait for others to arrive at barrier |
| 294 | */ |
| 295 | public void testArrive2() { |
| 296 | final Phaser phaser = new Phaser(); |
| 297 | assertEquals(0, phaser.register()); |
| 298 | List<Thread> threads = new ArrayList<Thread>(); |
| 299 | for (int i = 0; i < 10; i++) { |
| 300 | assertEquals(0, phaser.register()); |
| 301 | threads.add(newStartedThread(new CheckedRunnable() { |
| 302 | public void realRun() { |
| 303 | assertEquals(0, phaser.arriveAndDeregister()); |
| 304 | }})); |
| 305 | } |
| 306 | |
| 307 | for (Thread thread : threads) |
| 308 | awaitTermination(thread); |
| 309 | assertState(phaser, 0, 1, 1); |
| 310 | assertEquals(0, phaser.arrive()); |
| 311 | assertState(phaser, 1, 1, 1); |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * arrive() returns a negative number if the Phaser is terminated |
| 316 | */ |
| 317 | public void testArrive3() { |
| 318 | Phaser phaser = new Phaser(1); |
| 319 | phaser.forceTermination(); |
| 320 | assertTerminated(phaser, 0, 1); |
| 321 | assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
| 322 | assertTrue(phaser.arrive() < 0); |
| 323 | assertTrue(phaser.register() < 0); |
| 324 | assertTrue(phaser.arriveAndDeregister() < 0); |
| 325 | assertTrue(phaser.awaitAdvance(1) < 0); |
| 326 | assertTrue(phaser.getPhase() < 0); |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * arriveAndDeregister() throws IllegalStateException if number of |
| 331 | * registered or unarrived parties would become negative |
| 332 | */ |
| 333 | public void testArriveAndDeregister1() { |
| 334 | try { |
| 335 | Phaser phaser = new Phaser(); |
| 336 | phaser.arriveAndDeregister(); |
| 337 | shouldThrow(); |
| 338 | } catch (IllegalStateException success) {} |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * arriveAndDeregister reduces the number of arrived parties |
| 343 | */ |
| 344 | public void testArriveAndDeregister2() { |
| 345 | final Phaser phaser = new Phaser(1); |
| 346 | assertEquals(0, phaser.register()); |
| 347 | assertEquals(0, phaser.arrive()); |
| 348 | assertState(phaser, 0, 2, 1); |
| 349 | assertEquals(0, phaser.arriveAndDeregister()); |
| 350 | assertState(phaser, 1, 1, 1); |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * arriveAndDeregister arrives at the barrier on a phaser with a parent and |
| 355 | * when a deregistration occurs and causes the phaser to have zero parties |
| 356 | * its parent will be deregistered as well |
| 357 | */ |
| 358 | public void testArriveAndDeregister3() { |
| 359 | Phaser parent = new Phaser(); |
| 360 | Phaser child = new Phaser(parent); |
| 361 | assertState(child, 0, 0, 0); |
| 362 | assertState(parent, 0, 0, 0); |
| 363 | assertEquals(0, child.register()); |
| 364 | assertState(child, 0, 1, 1); |
| 365 | assertState(parent, 0, 1, 1); |
| 366 | assertEquals(0, child.arriveAndDeregister()); |
| 367 | assertTerminated(child, 1); |
| 368 | assertTerminated(parent, 1); |
| 369 | } |
| 370 | |
| 371 | /** |
| 372 | * arriveAndDeregister deregisters one party from its parent when |
| 373 | * the number of parties of child is zero after deregistration |
| 374 | */ |
| 375 | public void testArriveAndDeregister4() { |
| 376 | Phaser parent = new Phaser(); |
| 377 | Phaser child = new Phaser(parent); |
| 378 | assertEquals(0, parent.register()); |
| 379 | assertEquals(0, child.register()); |
| 380 | assertState(child, 0, 1, 1); |
| 381 | assertState(parent, 0, 2, 2); |
| 382 | assertEquals(0, child.arriveAndDeregister()); |
| 383 | assertState(child, 0, 0, 0); |
| 384 | assertState(parent, 0, 1, 1); |
| 385 | } |
| 386 | |
| 387 | /** |
| 388 | * arriveAndDeregister deregisters one party from its parent when |
| 389 | * the number of parties of root is nonzero after deregistration. |
| 390 | */ |
| 391 | public void testArriveAndDeregister5() { |
| 392 | Phaser root = new Phaser(); |
| 393 | Phaser parent = new Phaser(root); |
| 394 | Phaser child = new Phaser(parent); |
| 395 | assertState(root, 0, 0, 0); |
| 396 | assertState(parent, 0, 0, 0); |
| 397 | assertState(child, 0, 0, 0); |
| 398 | assertEquals(0, child.register()); |
| 399 | assertState(root, 0, 1, 1); |
| 400 | assertState(parent, 0, 1, 1); |
| 401 | assertState(child, 0, 1, 1); |
| 402 | assertEquals(0, child.arriveAndDeregister()); |
| 403 | assertTerminated(child, 1); |
| 404 | assertTerminated(parent, 1); |
| 405 | assertTerminated(root, 1); |
| 406 | } |
| 407 | |
| 408 | /** |
| 409 | * arriveAndDeregister returns the phase in which it leaves the |
| 410 | * phaser in after deregistration |
| 411 | */ |
| 412 | public void testArriveAndDeregister6() { |
| 413 | final Phaser phaser = new Phaser(2); |
| 414 | Thread t = newStartedThread(new CheckedRunnable() { |
| 415 | public void realRun() { |
| 416 | assertEquals(0, phaser.arrive()); |
| 417 | }}); |
| 418 | assertEquals(1, phaser.arriveAndAwaitAdvance()); |
| 419 | assertState(phaser, 1, 2, 2); |
| 420 | assertEquals(1, phaser.arriveAndDeregister()); |
| 421 | assertState(phaser, 1, 1, 1); |
| 422 | assertEquals(1, phaser.arriveAndDeregister()); |
| 423 | assertTerminated(phaser, 2); |
| 424 | awaitTermination(t); |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * awaitAdvance succeeds upon advance |
| 429 | */ |
| 430 | public void testAwaitAdvance1() { |
| 431 | final Phaser phaser = new Phaser(1); |
| 432 | assertEquals(0, phaser.arrive()); |
| 433 | assertEquals(1, phaser.awaitAdvance(0)); |
| 434 | } |
| 435 | |
| 436 | /** |
| 437 | * awaitAdvance with a negative parameter will return without affecting the |
| 438 | * phaser |
| 439 | */ |
| 440 | public void testAwaitAdvance2() { |
| 441 | Phaser phaser = new Phaser(); |
| 442 | assertTrue(phaser.awaitAdvance(-1) < 0); |
| 443 | assertState(phaser, 0, 0, 0); |
| 444 | } |
| 445 | |
| 446 | /** |
| 447 | * awaitAdvanceInterruptibly blocks interruptibly |
| 448 | */ |
| 449 | public void testAwaitAdvanceInterruptibly_interruptible() throws InterruptedException { |
| 450 | final Phaser phaser = new Phaser(1); |
| 451 | final CountDownLatch pleaseInterrupt = new CountDownLatch(2); |
| 452 | |
| 453 | Thread t1 = newStartedThread(new CheckedRunnable() { |
| 454 | public void realRun() { |
| 455 | Thread.currentThread().interrupt(); |
| 456 | try { |
| 457 | phaser.awaitAdvanceInterruptibly(0); |
| 458 | shouldThrow(); |
| 459 | } catch (InterruptedException success) {} |
| 460 | assertFalse(Thread.interrupted()); |
| 461 | |
| 462 | pleaseInterrupt.countDown(); |
| 463 | try { |
| 464 | phaser.awaitAdvanceInterruptibly(0); |
| 465 | shouldThrow(); |
| 466 | } catch (InterruptedException success) {} |
| 467 | assertFalse(Thread.interrupted()); |
| 468 | }}); |
| 469 | |
| 470 | Thread t2 = newStartedThread(new CheckedRunnable() { |
| 471 | public void realRun() throws TimeoutException { |
| 472 | Thread.currentThread().interrupt(); |
| 473 | try { |
| 474 | phaser.awaitAdvanceInterruptibly(0, 2*LONG_DELAY_MS, MILLISECONDS); |
| 475 | shouldThrow(); |
| 476 | } catch (InterruptedException success) {} |
| 477 | assertFalse(Thread.interrupted()); |
| 478 | |
| 479 | pleaseInterrupt.countDown(); |
| 480 | try { |
| 481 | phaser.awaitAdvanceInterruptibly(0, 2*LONG_DELAY_MS, MILLISECONDS); |
| 482 | shouldThrow(); |
| 483 | } catch (InterruptedException success) {} |
| 484 | assertFalse(Thread.interrupted()); |
| 485 | }}); |
| 486 | |
| 487 | await(pleaseInterrupt); |
| 488 | assertState(phaser, 0, 1, 1); |
| 489 | assertThreadsStayAlive(t1, t2); |
| 490 | t1.interrupt(); |
| 491 | t2.interrupt(); |
| 492 | awaitTermination(t1); |
| 493 | awaitTermination(t2); |
| 494 | assertState(phaser, 0, 1, 1); |
| 495 | assertEquals(0, phaser.arrive()); |
| 496 | assertState(phaser, 1, 1, 1); |
| 497 | } |
| 498 | |
| 499 | /** |
| 500 | * awaitAdvance continues waiting if interrupted before waiting |
| 501 | */ |
| 502 | public void testAwaitAdvanceAfterInterrupt() { |
| 503 | final Phaser phaser = new Phaser(); |
| 504 | assertEquals(0, phaser.register()); |
| 505 | final CountDownLatch pleaseArrive = new CountDownLatch(1); |
| 506 | |
| 507 | Thread t = newStartedThread(new CheckedRunnable() { |
| 508 | public void realRun() { |
| 509 | Thread.currentThread().interrupt(); |
| 510 | assertEquals(0, phaser.register()); |
| 511 | assertEquals(0, phaser.arrive()); |
| 512 | pleaseArrive.countDown(); |
| 513 | assertTrue(Thread.currentThread().isInterrupted()); |
| 514 | assertEquals(1, phaser.awaitAdvance(0)); |
| 515 | assertTrue(Thread.interrupted()); |
| 516 | }}); |
| 517 | |
| 518 | await(pleaseArrive); |
| 519 | waitForThreadToEnterWaitState(t, SHORT_DELAY_MS); |
| 520 | assertEquals(0, phaser.arrive()); |
| 521 | awaitTermination(t); |
| 522 | |
| 523 | Thread.currentThread().interrupt(); |
| 524 | assertEquals(1, phaser.awaitAdvance(0)); |
| 525 | assertTrue(Thread.interrupted()); |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * awaitAdvance continues waiting if interrupted while waiting |
| 530 | */ |
| 531 | public void testAwaitAdvanceBeforeInterrupt() { |
| 532 | final Phaser phaser = new Phaser(); |
| 533 | assertEquals(0, phaser.register()); |
| 534 | final CountDownLatch pleaseArrive = new CountDownLatch(1); |
| 535 | |
| 536 | Thread t = newStartedThread(new CheckedRunnable() { |
| 537 | public void realRun() { |
| 538 | assertEquals(0, phaser.register()); |
| 539 | assertEquals(0, phaser.arrive()); |
| 540 | assertFalse(Thread.currentThread().isInterrupted()); |
| 541 | pleaseArrive.countDown(); |
| 542 | assertEquals(1, phaser.awaitAdvance(0)); |
| 543 | assertTrue(Thread.interrupted()); |
| 544 | }}); |
| 545 | |
| 546 | await(pleaseArrive); |
| 547 | waitForThreadToEnterWaitState(t, SHORT_DELAY_MS); |
| 548 | t.interrupt(); |
| 549 | assertEquals(0, phaser.arrive()); |
| 550 | awaitTermination(t); |
| 551 | |
| 552 | Thread.currentThread().interrupt(); |
| 553 | assertEquals(1, phaser.awaitAdvance(0)); |
| 554 | assertTrue(Thread.interrupted()); |
| 555 | } |
| 556 | |
| 557 | /** |
| 558 | * arriveAndAwaitAdvance continues waiting if interrupted before waiting |
| 559 | */ |
| 560 | public void testArriveAndAwaitAdvanceAfterInterrupt() { |
| 561 | final Phaser phaser = new Phaser(); |
| 562 | assertEquals(0, phaser.register()); |
| 563 | final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| 564 | |
| 565 | Thread t = newStartedThread(new CheckedRunnable() { |
| 566 | public void realRun() { |
| 567 | Thread.currentThread().interrupt(); |
| 568 | assertEquals(0, phaser.register()); |
| 569 | pleaseInterrupt.countDown(); |
| 570 | assertTrue(Thread.currentThread().isInterrupted()); |
| 571 | assertEquals(1, phaser.arriveAndAwaitAdvance()); |
| 572 | assertTrue(Thread.currentThread().isInterrupted()); |
| 573 | }}); |
| 574 | |
| 575 | await(pleaseInterrupt); |
| 576 | waitForThreadToEnterWaitState(t, SHORT_DELAY_MS); |
| 577 | Thread.currentThread().interrupt(); |
| 578 | assertEquals(1, phaser.arriveAndAwaitAdvance()); |
| 579 | assertTrue(Thread.interrupted()); |
| 580 | awaitTermination(t); |
| 581 | } |
| 582 | |
| 583 | /** |
| 584 | * arriveAndAwaitAdvance continues waiting if interrupted while waiting |
| 585 | */ |
| 586 | public void testArriveAndAwaitAdvanceBeforeInterrupt() { |
| 587 | final Phaser phaser = new Phaser(); |
| 588 | assertEquals(0, phaser.register()); |
| 589 | final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| 590 | |
| 591 | Thread t = newStartedThread(new CheckedRunnable() { |
| 592 | public void realRun() { |
| 593 | assertEquals(0, phaser.register()); |
| 594 | assertFalse(Thread.currentThread().isInterrupted()); |
| 595 | pleaseInterrupt.countDown(); |
| 596 | assertEquals(1, phaser.arriveAndAwaitAdvance()); |
| 597 | assertTrue(Thread.currentThread().isInterrupted()); |
| 598 | }}); |
| 599 | |
| 600 | await(pleaseInterrupt); |
| 601 | waitForThreadToEnterWaitState(t, SHORT_DELAY_MS); |
| 602 | t.interrupt(); |
| 603 | Thread.currentThread().interrupt(); |
| 604 | assertEquals(1, phaser.arriveAndAwaitAdvance()); |
| 605 | assertTrue(Thread.interrupted()); |
| 606 | awaitTermination(t); |
| 607 | } |
| 608 | |
| 609 | /** |
| 610 | * awaitAdvance atomically waits for all parties within the same phase to |
| 611 | * complete before continuing |
| 612 | */ |
| 613 | public void testAwaitAdvance4() { |
| 614 | final Phaser phaser = new Phaser(4); |
| 615 | final AtomicInteger count = new AtomicInteger(0); |
| 616 | List<Thread> threads = new ArrayList<Thread>(); |
| 617 | for (int i = 0; i < 4; i++) |
| 618 | threads.add(newStartedThread(new CheckedRunnable() { |
| 619 | public void realRun() { |
| 620 | for (int k = 0; k < 3; k++) { |
| 621 | assertEquals(2*k+1, phaser.arriveAndAwaitAdvance()); |
| 622 | count.incrementAndGet(); |
| 623 | assertEquals(2*k+1, phaser.arrive()); |
| 624 | assertEquals(2*k+2, phaser.awaitAdvance(2*k+1)); |
| 625 | assertEquals(4*(k+1), count.get()); |
| 626 | }}})); |
| 627 | |
| 628 | for (Thread thread : threads) |
| 629 | awaitTermination(thread); |
| 630 | } |
| 631 | |
| 632 | /** |
| 633 | * awaitAdvance returns the current phase |
| 634 | */ |
| 635 | public void testAwaitAdvance5() { |
| 636 | final Phaser phaser = new Phaser(1); |
| 637 | assertEquals(1, phaser.awaitAdvance(phaser.arrive())); |
| 638 | assertEquals(1, phaser.getPhase()); |
| 639 | assertEquals(1, phaser.register()); |
| 640 | List<Thread> threads = new ArrayList<Thread>(); |
| 641 | for (int i = 0; i < 8; i++) { |
| 642 | final CountDownLatch latch = new CountDownLatch(1); |
| 643 | final boolean goesFirst = ((i & 1) == 0); |
| 644 | threads.add(newStartedThread(new CheckedRunnable() { |
| 645 | public void realRun() { |
| 646 | if (goesFirst) |
| 647 | latch.countDown(); |
| 648 | else |
| 649 | await(latch); |
| 650 | phaser.arrive(); |
| 651 | }})); |
| 652 | if (goesFirst) |
| 653 | await(latch); |
| 654 | else |
| 655 | latch.countDown(); |
| 656 | assertEquals(i + 2, phaser.awaitAdvance(phaser.arrive())); |
| 657 | assertEquals(i + 2, phaser.getPhase()); |
| 658 | } |
| 659 | for (Thread thread : threads) |
| 660 | awaitTermination(thread); |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * awaitAdvance returns the current phase in child phasers |
| 665 | */ |
| 666 | public void testAwaitAdvanceTieredPhaser() throws Exception { |
| 667 | final Phaser parent = new Phaser(); |
| 668 | final List<Phaser> zeroPartyChildren = new ArrayList<Phaser>(3); |
| 669 | final List<Phaser> onePartyChildren = new ArrayList<Phaser>(3); |
| 670 | for (int i = 0; i < 3; i++) { |
| 671 | zeroPartyChildren.add(new Phaser(parent, 0)); |
| 672 | onePartyChildren.add(new Phaser(parent, 1)); |
| 673 | } |
| 674 | final List<Phaser> phasers = new ArrayList<Phaser>(); |
| 675 | phasers.addAll(zeroPartyChildren); |
| 676 | phasers.addAll(onePartyChildren); |
| 677 | phasers.add(parent); |
| 678 | for (Phaser phaser : phasers) { |
| 679 | assertEquals(-42, phaser.awaitAdvance(-42)); |
| 680 | assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42)); |
| 681 | assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42, SMALL_DELAY_MS, MILLISECONDS)); |
| 682 | } |
| 683 | |
| 684 | for (Phaser child : onePartyChildren) |
| 685 | assertEquals(0, child.arrive()); |
| 686 | for (Phaser phaser : phasers) { |
| 687 | assertEquals(-42, phaser.awaitAdvance(-42)); |
| 688 | assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42)); |
| 689 | assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42, SMALL_DELAY_MS, MILLISECONDS)); |
| 690 | assertEquals(1, phaser.awaitAdvance(0)); |
| 691 | assertEquals(1, phaser.awaitAdvanceInterruptibly(0)); |
| 692 | assertEquals(1, phaser.awaitAdvanceInterruptibly(0, SMALL_DELAY_MS, MILLISECONDS)); |
| 693 | } |
| 694 | |
| 695 | for (Phaser child : onePartyChildren) |
| 696 | assertEquals(1, child.arrive()); |
| 697 | for (Phaser phaser : phasers) { |
| 698 | assertEquals(-42, phaser.awaitAdvance(-42)); |
| 699 | assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42)); |
| 700 | assertEquals(-42, phaser.awaitAdvanceInterruptibly(-42, SMALL_DELAY_MS, MILLISECONDS)); |
| 701 | assertEquals(2, phaser.awaitAdvance(0)); |
| 702 | assertEquals(2, phaser.awaitAdvanceInterruptibly(0)); |
| 703 | assertEquals(2, phaser.awaitAdvanceInterruptibly(0, SMALL_DELAY_MS, MILLISECONDS)); |
| 704 | assertEquals(2, phaser.awaitAdvance(1)); |
| 705 | assertEquals(2, phaser.awaitAdvanceInterruptibly(1)); |
| 706 | assertEquals(2, phaser.awaitAdvanceInterruptibly(1, SMALL_DELAY_MS, MILLISECONDS)); |
| 707 | } |
| 708 | } |
| 709 | |
| 710 | /** |
| 711 | * awaitAdvance returns when the phaser is externally terminated |
| 712 | */ |
| 713 | public void testAwaitAdvance6() { |
| 714 | final Phaser phaser = new Phaser(3); |
| 715 | final CountDownLatch pleaseForceTermination = new CountDownLatch(2); |
| 716 | final List<Thread> threads = new ArrayList<Thread>(); |
| 717 | for (int i = 0; i < 2; i++) { |
| 718 | Runnable r = new CheckedRunnable() { |
| 719 | public void realRun() { |
| 720 | assertEquals(0, phaser.arrive()); |
| 721 | pleaseForceTermination.countDown(); |
| 722 | assertTrue(phaser.awaitAdvance(0) < 0); |
| 723 | assertTrue(phaser.isTerminated()); |
| 724 | assertTrue(phaser.getPhase() < 0); |
| 725 | assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
| 726 | assertEquals(3, phaser.getRegisteredParties()); |
| 727 | }}; |
| 728 | threads.add(newStartedThread(r)); |
| 729 | } |
| 730 | await(pleaseForceTermination); |
| 731 | phaser.forceTermination(); |
| 732 | assertTrue(phaser.isTerminated()); |
| 733 | assertEquals(0, phaser.getPhase() + Integer.MIN_VALUE); |
| 734 | for (Thread thread : threads) |
| 735 | awaitTermination(thread); |
| 736 | assertEquals(3, phaser.getRegisteredParties()); |
| 737 | } |
| 738 | |
| 739 | /** |
| 740 | * arriveAndAwaitAdvance throws IllegalStateException with no |
| 741 | * unarrived parties |
| 742 | */ |
| 743 | public void testArriveAndAwaitAdvance1() { |
| 744 | try { |
| 745 | Phaser phaser = new Phaser(); |
| 746 | phaser.arriveAndAwaitAdvance(); |
| 747 | shouldThrow(); |
| 748 | } catch (IllegalStateException success) {} |
| 749 | } |
| 750 | |
| 751 | /** |
| 752 | * arriveAndAwaitAdvance waits for all threads to arrive, the |
| 753 | * number of arrived parties is the same number that is accounted |
| 754 | * for when the main thread awaitsAdvance |
| 755 | */ |
| 756 | public void testArriveAndAwaitAdvance3() { |
| 757 | final Phaser phaser = new Phaser(1); |
| 758 | final int THREADS = 3; |
| 759 | final CountDownLatch pleaseArrive = new CountDownLatch(THREADS); |
| 760 | final List<Thread> threads = new ArrayList<Thread>(); |
| 761 | for (int i = 0; i < THREADS; i++) |
| 762 | threads.add(newStartedThread(new CheckedRunnable() { |
| 763 | public void realRun() { |
| 764 | assertEquals(0, phaser.register()); |
| 765 | pleaseArrive.countDown(); |
| 766 | assertEquals(1, phaser.arriveAndAwaitAdvance()); |
| 767 | }})); |
| 768 | |
| 769 | await(pleaseArrive); |
| 770 | long startTime = System.nanoTime(); |
| 771 | while (phaser.getArrivedParties() < THREADS) |
| 772 | Thread.yield(); |
| 773 | assertEquals(THREADS, phaser.getArrivedParties()); |
| 774 | assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
| 775 | for (Thread thread : threads) |
| 776 | waitForThreadToEnterWaitState(thread, SHORT_DELAY_MS); |
| 777 | for (Thread thread : threads) |
| 778 | assertTrue(thread.isAlive()); |
| 779 | assertState(phaser, 0, THREADS + 1, 1); |
| 780 | phaser.arriveAndAwaitAdvance(); |
| 781 | for (Thread thread : threads) |
| 782 | awaitTermination(thread); |
| 783 | assertState(phaser, 1, THREADS + 1, THREADS + 1); |
| 784 | } |
| 785 | |
| 786 | } |