Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Written by Doug Lea and Martin Buchholz with assistance from |
| 3 | * members of JCP JSR-166 Expert Group and released to the public |
| 4 | * domain, as explained at |
| 5 | * http://creativecommons.org/publicdomain/zero/1.0/ |
| 6 | * Other contributors include Andrew Wright, Jeffrey Hayes, |
| 7 | * Pat Fisher, Mike Judd. |
| 8 | */ |
| 9 | |
| 10 | package jsr166; |
| 11 | |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 12 | import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 13 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 14 | import java.util.concurrent.CountDownLatch; |
| 15 | import java.util.concurrent.atomic.AtomicBoolean; |
| 16 | import java.util.concurrent.locks.LockSupport; |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 17 | |
| 18 | import junit.framework.Test; |
| 19 | import junit.framework.TestSuite; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 20 | |
| 21 | public class LockSupportTest extends JSR166TestCase { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 22 | // android-note: Removed because the CTS runner does a bad job of |
| 23 | // retrying tests that have suite() declarations. |
| 24 | // |
| 25 | // public static void main(String[] args) { |
| 26 | // main(suite(), args); |
| 27 | // } |
| 28 | // public static Test suite() { |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 29 | // return new TestSuite(LockSupportTest.class); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 30 | // } |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 31 | |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 32 | static { |
| 33 | // Reduce the risk of rare disastrous classloading in first call to |
| 34 | // LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773 |
| 35 | Class<?> ensureLoaded = LockSupport.class; |
| 36 | } |
| 37 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 38 | /** |
| 39 | * Returns the blocker object used by tests in this file. |
| 40 | * Any old object will do; we'll return a convenient one. |
| 41 | */ |
| 42 | static Object theBlocker() { |
| 43 | return LockSupportTest.class; |
| 44 | } |
| 45 | |
| 46 | enum ParkMethod { |
| 47 | park() { |
| 48 | void park() { |
| 49 | LockSupport.park(); |
| 50 | } |
| 51 | void park(long millis) { |
| 52 | throw new UnsupportedOperationException(); |
| 53 | } |
| 54 | }, |
| 55 | parkUntil() { |
| 56 | void park(long millis) { |
| 57 | LockSupport.parkUntil(deadline(millis)); |
| 58 | } |
| 59 | }, |
| 60 | parkNanos() { |
| 61 | void park(long millis) { |
| 62 | LockSupport.parkNanos(MILLISECONDS.toNanos(millis)); |
| 63 | } |
| 64 | }, |
| 65 | parkBlocker() { |
| 66 | void park() { |
| 67 | LockSupport.park(theBlocker()); |
| 68 | } |
| 69 | void park(long millis) { |
| 70 | throw new UnsupportedOperationException(); |
| 71 | } |
| 72 | }, |
| 73 | parkUntilBlocker() { |
| 74 | void park(long millis) { |
| 75 | LockSupport.parkUntil(theBlocker(), deadline(millis)); |
| 76 | } |
| 77 | }, |
| 78 | parkNanosBlocker() { |
| 79 | void park(long millis) { |
| 80 | LockSupport.parkNanos(theBlocker(), |
| 81 | MILLISECONDS.toNanos(millis)); |
| 82 | } |
| 83 | }; |
| 84 | |
| 85 | void park() { park(2 * LONG_DELAY_MS); } |
| 86 | abstract void park(long millis); |
| 87 | |
| 88 | /** Returns a deadline to use with parkUntil. */ |
| 89 | long deadline(long millis) { |
| 90 | // beware of rounding |
| 91 | return System.currentTimeMillis() + millis + 1; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * park is released by subsequent unpark |
| 97 | */ |
| 98 | public void testParkBeforeUnpark_park() { |
| 99 | testParkBeforeUnpark(ParkMethod.park); |
| 100 | } |
| 101 | public void testParkBeforeUnpark_parkNanos() { |
| 102 | testParkBeforeUnpark(ParkMethod.parkNanos); |
| 103 | } |
| 104 | public void testParkBeforeUnpark_parkUntil() { |
| 105 | testParkBeforeUnpark(ParkMethod.parkUntil); |
| 106 | } |
| 107 | public void testParkBeforeUnpark_parkBlocker() { |
| 108 | testParkBeforeUnpark(ParkMethod.parkBlocker); |
| 109 | } |
| 110 | public void testParkBeforeUnpark_parkNanosBlocker() { |
| 111 | testParkBeforeUnpark(ParkMethod.parkNanosBlocker); |
| 112 | } |
| 113 | public void testParkBeforeUnpark_parkUntilBlocker() { |
| 114 | testParkBeforeUnpark(ParkMethod.parkUntilBlocker); |
| 115 | } |
| 116 | public void testParkBeforeUnpark(final ParkMethod parkMethod) { |
| 117 | final CountDownLatch pleaseUnpark = new CountDownLatch(1); |
| 118 | Thread t = newStartedThread(new CheckedRunnable() { |
| 119 | public void realRun() { |
| 120 | pleaseUnpark.countDown(); |
| 121 | parkMethod.park(); |
| 122 | }}); |
| 123 | |
| 124 | await(pleaseUnpark); |
| 125 | LockSupport.unpark(t); |
| 126 | awaitTermination(t); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * park is released by preceding unpark |
| 131 | */ |
| 132 | public void testParkAfterUnpark_park() { |
| 133 | testParkAfterUnpark(ParkMethod.park); |
| 134 | } |
| 135 | public void testParkAfterUnpark_parkNanos() { |
| 136 | testParkAfterUnpark(ParkMethod.parkNanos); |
| 137 | } |
| 138 | public void testParkAfterUnpark_parkUntil() { |
| 139 | testParkAfterUnpark(ParkMethod.parkUntil); |
| 140 | } |
| 141 | public void testParkAfterUnpark_parkBlocker() { |
| 142 | testParkAfterUnpark(ParkMethod.parkBlocker); |
| 143 | } |
| 144 | public void testParkAfterUnpark_parkNanosBlocker() { |
| 145 | testParkAfterUnpark(ParkMethod.parkNanosBlocker); |
| 146 | } |
| 147 | public void testParkAfterUnpark_parkUntilBlocker() { |
| 148 | testParkAfterUnpark(ParkMethod.parkUntilBlocker); |
| 149 | } |
| 150 | public void testParkAfterUnpark(final ParkMethod parkMethod) { |
| 151 | final CountDownLatch pleaseUnpark = new CountDownLatch(1); |
| 152 | final AtomicBoolean pleasePark = new AtomicBoolean(false); |
| 153 | Thread t = newStartedThread(new CheckedRunnable() { |
| 154 | public void realRun() { |
| 155 | pleaseUnpark.countDown(); |
| 156 | while (!pleasePark.get()) |
| 157 | Thread.yield(); |
| 158 | parkMethod.park(); |
| 159 | }}); |
| 160 | |
| 161 | await(pleaseUnpark); |
| 162 | LockSupport.unpark(t); |
| 163 | pleasePark.set(true); |
| 164 | awaitTermination(t); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * park is released by subsequent interrupt |
| 169 | */ |
| 170 | public void testParkBeforeInterrupt_park() { |
| 171 | testParkBeforeInterrupt(ParkMethod.park); |
| 172 | } |
| 173 | public void testParkBeforeInterrupt_parkNanos() { |
| 174 | testParkBeforeInterrupt(ParkMethod.parkNanos); |
| 175 | } |
| 176 | public void testParkBeforeInterrupt_parkUntil() { |
| 177 | testParkBeforeInterrupt(ParkMethod.parkUntil); |
| 178 | } |
| 179 | public void testParkBeforeInterrupt_parkBlocker() { |
| 180 | testParkBeforeInterrupt(ParkMethod.parkBlocker); |
| 181 | } |
| 182 | public void testParkBeforeInterrupt_parkNanosBlocker() { |
| 183 | testParkBeforeInterrupt(ParkMethod.parkNanosBlocker); |
| 184 | } |
| 185 | public void testParkBeforeInterrupt_parkUntilBlocker() { |
| 186 | testParkBeforeInterrupt(ParkMethod.parkUntilBlocker); |
| 187 | } |
| 188 | public void testParkBeforeInterrupt(final ParkMethod parkMethod) { |
| 189 | final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| 190 | Thread t = newStartedThread(new CheckedRunnable() { |
| 191 | public void realRun() { |
| 192 | pleaseInterrupt.countDown(); |
| 193 | do { |
| 194 | parkMethod.park(); |
| 195 | // park may return spuriously |
| 196 | } while (! Thread.currentThread().isInterrupted()); |
| 197 | }}); |
| 198 | |
| 199 | await(pleaseInterrupt); |
| 200 | assertThreadStaysAlive(t); |
| 201 | t.interrupt(); |
| 202 | awaitTermination(t); |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * park is released by preceding interrupt |
| 207 | */ |
| 208 | public void testParkAfterInterrupt_park() { |
| 209 | testParkAfterInterrupt(ParkMethod.park); |
| 210 | } |
| 211 | public void testParkAfterInterrupt_parkNanos() { |
| 212 | testParkAfterInterrupt(ParkMethod.parkNanos); |
| 213 | } |
| 214 | public void testParkAfterInterrupt_parkUntil() { |
| 215 | testParkAfterInterrupt(ParkMethod.parkUntil); |
| 216 | } |
| 217 | public void testParkAfterInterrupt_parkBlocker() { |
| 218 | testParkAfterInterrupt(ParkMethod.parkBlocker); |
| 219 | } |
| 220 | public void testParkAfterInterrupt_parkNanosBlocker() { |
| 221 | testParkAfterInterrupt(ParkMethod.parkNanosBlocker); |
| 222 | } |
| 223 | public void testParkAfterInterrupt_parkUntilBlocker() { |
| 224 | testParkAfterInterrupt(ParkMethod.parkUntilBlocker); |
| 225 | } |
| 226 | public void testParkAfterInterrupt(final ParkMethod parkMethod) { |
| 227 | final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
| 228 | final AtomicBoolean pleasePark = new AtomicBoolean(false); |
| 229 | Thread t = newStartedThread(new CheckedRunnable() { |
| 230 | public void realRun() throws Exception { |
| 231 | pleaseInterrupt.countDown(); |
| 232 | while (!pleasePark.get()) |
| 233 | Thread.yield(); |
| 234 | assertTrue(Thread.currentThread().isInterrupted()); |
| 235 | parkMethod.park(); |
| 236 | assertTrue(Thread.currentThread().isInterrupted()); |
| 237 | }}); |
| 238 | |
| 239 | await(pleaseInterrupt); |
| 240 | t.interrupt(); |
| 241 | pleasePark.set(true); |
| 242 | awaitTermination(t); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * timed park times out if not unparked |
| 247 | */ |
| 248 | public void testParkTimesOut_parkNanos() { |
| 249 | testParkTimesOut(ParkMethod.parkNanos); |
| 250 | } |
| 251 | public void testParkTimesOut_parkUntil() { |
| 252 | testParkTimesOut(ParkMethod.parkUntil); |
| 253 | } |
| 254 | public void testParkTimesOut_parkNanosBlocker() { |
| 255 | testParkTimesOut(ParkMethod.parkNanosBlocker); |
| 256 | } |
| 257 | public void testParkTimesOut_parkUntilBlocker() { |
| 258 | testParkTimesOut(ParkMethod.parkUntilBlocker); |
| 259 | } |
| 260 | public void testParkTimesOut(final ParkMethod parkMethod) { |
| 261 | Thread t = newStartedThread(new CheckedRunnable() { |
| 262 | public void realRun() { |
| 263 | for (;;) { |
| 264 | long startTime = System.nanoTime(); |
| 265 | parkMethod.park(timeoutMillis()); |
| 266 | // park may return spuriously |
| 267 | if (millisElapsedSince(startTime) >= timeoutMillis()) |
| 268 | return; |
| 269 | } |
| 270 | }}); |
| 271 | |
| 272 | awaitTermination(t); |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * getBlocker(null) throws NullPointerException |
| 277 | */ |
| 278 | public void testGetBlockerNull() { |
| 279 | try { |
| 280 | LockSupport.getBlocker(null); |
| 281 | shouldThrow(); |
| 282 | } catch (NullPointerException success) {} |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * getBlocker returns the blocker object passed to park |
| 287 | */ |
| 288 | public void testGetBlocker_parkBlocker() { |
| 289 | testGetBlocker(ParkMethod.parkBlocker); |
| 290 | } |
| 291 | public void testGetBlocker_parkNanosBlocker() { |
| 292 | testGetBlocker(ParkMethod.parkNanosBlocker); |
| 293 | } |
| 294 | public void testGetBlocker_parkUntilBlocker() { |
| 295 | testGetBlocker(ParkMethod.parkUntilBlocker); |
| 296 | } |
| 297 | public void testGetBlocker(final ParkMethod parkMethod) { |
| 298 | final CountDownLatch started = new CountDownLatch(1); |
| 299 | Thread t = newStartedThread(new CheckedRunnable() { |
| 300 | public void realRun() { |
| 301 | Thread t = Thread.currentThread(); |
| 302 | started.countDown(); |
| 303 | do { |
| 304 | assertNull(LockSupport.getBlocker(t)); |
| 305 | parkMethod.park(); |
| 306 | assertNull(LockSupport.getBlocker(t)); |
| 307 | // park may return spuriously |
| 308 | } while (! Thread.currentThread().isInterrupted()); |
| 309 | }}); |
| 310 | |
| 311 | long startTime = System.nanoTime(); |
| 312 | await(started); |
| 313 | for (;;) { |
| 314 | Object x = LockSupport.getBlocker(t); |
| 315 | if (x == theBlocker()) { // success |
| 316 | t.interrupt(); |
| 317 | awaitTermination(t); |
| 318 | assertNull(LockSupport.getBlocker(t)); |
| 319 | return; |
| 320 | } else { |
| 321 | assertNull(x); // ok |
| 322 | if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
| 323 | fail("timed out"); |
| 324 | Thread.yield(); |
| 325 | } |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * timed park(0) returns immediately. |
| 331 | * |
| 332 | * Requires hotspot fix for: |
| 333 | * 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever |
| 334 | * which is in jdk7-b118 and 6u25. |
| 335 | */ |
| 336 | public void testPark0_parkNanos() { |
| 337 | testPark0(ParkMethod.parkNanos); |
| 338 | } |
| 339 | public void testPark0_parkUntil() { |
| 340 | testPark0(ParkMethod.parkUntil); |
| 341 | } |
| 342 | public void testPark0_parkNanosBlocker() { |
| 343 | testPark0(ParkMethod.parkNanosBlocker); |
| 344 | } |
| 345 | public void testPark0_parkUntilBlocker() { |
| 346 | testPark0(ParkMethod.parkUntilBlocker); |
| 347 | } |
| 348 | public void testPark0(final ParkMethod parkMethod) { |
| 349 | Thread t = newStartedThread(new CheckedRunnable() { |
| 350 | public void realRun() { |
| 351 | parkMethod.park(0L); |
| 352 | }}); |
| 353 | |
| 354 | awaitTermination(t); |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * timed park(Long.MIN_VALUE) returns immediately. |
| 359 | */ |
| 360 | public void testParkNeg_parkNanos() { |
| 361 | testParkNeg(ParkMethod.parkNanos); |
| 362 | } |
| 363 | public void testParkNeg_parkUntil() { |
| 364 | testParkNeg(ParkMethod.parkUntil); |
| 365 | } |
| 366 | public void testParkNeg_parkNanosBlocker() { |
| 367 | testParkNeg(ParkMethod.parkNanosBlocker); |
| 368 | } |
| 369 | public void testParkNeg_parkUntilBlocker() { |
| 370 | testParkNeg(ParkMethod.parkUntilBlocker); |
| 371 | } |
| 372 | public void testParkNeg(final ParkMethod parkMethod) { |
| 373 | Thread t = newStartedThread(new CheckedRunnable() { |
| 374 | public void realRun() { |
| 375 | parkMethod.park(Long.MIN_VALUE); |
| 376 | }}); |
| 377 | |
| 378 | awaitTermination(t); |
| 379 | } |
| 380 | } |