J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 4530538 |
| 27 | * @summary Basic unit test of the synchronization statistics support: |
| 28 | * |
| 29 | * @author Mandy Chung |
| 30 | * |
| 31 | * @ignore 6309226 |
| 32 | * @build Semaphore |
| 33 | * @run main SynchronizationStatistics |
| 34 | */ |
| 35 | |
| 36 | import java.lang.management.*; |
| 37 | |
| 38 | public class SynchronizationStatistics { |
| 39 | private static ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); |
| 40 | |
| 41 | private static boolean blockedTimeCheck = |
| 42 | mbean.isThreadContentionMonitoringSupported(); |
| 43 | private static boolean trace = false; |
| 44 | |
| 45 | private static Object lockA = new Object(); |
| 46 | private static Object lockB = new Object(); |
| 47 | private static Object lockC = new Object(); |
| 48 | private static Object lockD = new Object(); |
| 49 | private static Object waiter = new Object(); |
| 50 | private static volatile boolean testFailed = false; |
| 51 | |
| 52 | private static Object go = new Object(); |
| 53 | |
| 54 | private static void goSleep(long ms) { |
| 55 | try { |
| 56 | Thread.sleep(ms); |
| 57 | } catch (InterruptedException e) { |
| 58 | e.printStackTrace(); |
| 59 | System.out.println("Unexpected exception."); |
| 60 | testFailed = true; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | public static void main(String args[]) throws Exception { |
| 65 | if (args.length > 0 && args[0].equals("trace")) { |
| 66 | trace = true; |
| 67 | } |
| 68 | |
| 69 | if (blockedTimeCheck) { |
| 70 | mbean.setThreadContentionMonitoringEnabled(true); |
| 71 | } |
| 72 | |
| 73 | if (!mbean.isThreadContentionMonitoringEnabled()) { |
| 74 | throw new RuntimeException("TEST FAILED: " + |
| 75 | "Thread Contention Monitoring is not enabled"); |
| 76 | } |
| 77 | |
| 78 | Examiner examiner = new Examiner("Examiner"); |
| 79 | BlockedThread blocked = new BlockedThread("BlockedThread"); |
| 80 | examiner.setThread(blocked); |
| 81 | |
| 82 | // Start the threads and check them in Blocked and Waiting states |
| 83 | examiner.start(); |
| 84 | |
| 85 | // wait until the examiner acquires all the locks and waiting |
| 86 | // for the BlockedThread to start |
| 87 | examiner.waitUntilWaiting(); |
| 88 | |
| 89 | System.out.println("Checking the thread state for the examiner thread " + |
| 90 | "is waiting to begin."); |
| 91 | |
| 92 | // The Examiner should be waiting to be notified by the BlockedThread |
| 93 | checkThreadState(examiner, Thread.State.WAITING); |
| 94 | |
| 95 | System.out.println("Now starting the blocked thread"); |
| 96 | blocked.start(); |
| 97 | |
| 98 | try { |
| 99 | examiner.join(); |
| 100 | blocked.join(); |
| 101 | } catch (InterruptedException e) { |
| 102 | e.printStackTrace(); |
| 103 | System.out.println("Unexpected exception."); |
| 104 | testFailed = true; |
| 105 | } |
| 106 | |
| 107 | if (testFailed) |
| 108 | throw new RuntimeException("TEST FAILED."); |
| 109 | |
| 110 | System.out.println("Test passed."); |
| 111 | } |
| 112 | |
| 113 | private static String INDENT = " "; |
| 114 | private static void printStack(Thread t, StackTraceElement[] stack) { |
| 115 | System.out.println(INDENT + t + |
| 116 | " stack: (length = " + stack.length + ")"); |
| 117 | if (t != null) { |
| 118 | for (int j = 0; j < stack.length; j++) { |
| 119 | System.out.println(INDENT + stack[j]); |
| 120 | } |
| 121 | System.out.println(); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | private static void checkThreadState(Thread thread, Thread.State s) |
| 126 | throws Exception { |
| 127 | |
| 128 | ThreadInfo ti = mbean.getThreadInfo(thread.getId()); |
| 129 | if (ti.getThreadState() != s) { |
| 130 | ThreadInfo info = mbean.getThreadInfo(thread.getId(), |
| 131 | Integer.MAX_VALUE); |
| 132 | System.out.println(INDENT + "TEST FAILED:"); |
| 133 | printStack(thread, info.getStackTrace()); |
| 134 | System.out.println(INDENT + "Thread state: " + info.getThreadState()); |
| 135 | |
| 136 | throw new RuntimeException("TEST FAILED: " + |
| 137 | "Thread state for " + thread + " returns " + ti.getThreadState() + |
| 138 | ". Expected to be " + s); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | private static void checkThreadState(Thread thread, |
| 143 | Thread.State s1, Thread.State s2) |
| 144 | throws Exception { |
| 145 | |
| 146 | ThreadInfo ti = mbean.getThreadInfo(thread.getId()); |
| 147 | if (ti.getThreadState() != s1 && ti.getThreadState() != s2) { |
| 148 | throw new RuntimeException("TEST FAILED: " + |
| 149 | "Thread state for " + thread + " returns " + ti.getThreadState() + |
| 150 | ". Expected to be " + s1 + " or " + s2); |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | static class StatThread extends Thread { |
| 155 | private long blockingBaseTime = 0; |
| 156 | private long totalWaitTime = 0; |
| 157 | private long totalBlockedEnterTime = 0; |
| 158 | |
| 159 | StatThread(String name) { |
| 160 | super(name); |
| 161 | } |
| 162 | |
| 163 | void addWaitTime(long ns) { |
| 164 | totalWaitTime = totalWaitTime + ns; |
| 165 | } |
| 166 | void addBlockedEnterTime(long ns) { |
| 167 | totalBlockedEnterTime = totalBlockedEnterTime + ns; |
| 168 | } |
| 169 | void setBlockingBaseTime(long time) { |
| 170 | blockingBaseTime = time; |
| 171 | } |
| 172 | |
| 173 | long totalBlockedTimeMs() { |
| 174 | return totalBlockedEnterTime / 1000000; |
| 175 | } |
| 176 | |
| 177 | long totalBlockedTimeMs(long now) { |
| 178 | long t = totalBlockedEnterTime + (now - blockingBaseTime); |
| 179 | return t / 1000000; |
| 180 | } |
| 181 | |
| 182 | long totalWaitTimeMs() { |
| 183 | return totalWaitTime / 1000000; |
| 184 | } |
| 185 | |
| 186 | long totalWaitTimeMs(long now) { |
| 187 | long t = totalWaitTime + (now - blockingBaseTime); |
| 188 | return t / 1000000; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | static class BlockedThread extends StatThread { |
| 193 | private Semaphore handshake = new Semaphore(); |
| 194 | BlockedThread(String name) { |
| 195 | super(name); |
| 196 | } |
| 197 | void waitUntilBlocked() { |
| 198 | handshake.semaP(); |
| 199 | |
| 200 | // give a chance for the examiner thread to really wait |
| 201 | goSleep(20); |
| 202 | } |
| 203 | |
| 204 | void waitUntilWaiting() { |
| 205 | waitUntilBlocked(); |
| 206 | } |
| 207 | |
| 208 | boolean hasWaitersForBlocked() { |
| 209 | return (handshake.getWaiterCount() > 0); |
| 210 | } |
| 211 | |
| 212 | private void notifyWaiter() { |
| 213 | // wait until the examiner waits on the semaphore |
| 214 | while (handshake.getWaiterCount() == 0) { |
| 215 | goSleep(20); |
| 216 | } |
| 217 | handshake.semaV(); |
| 218 | } |
| 219 | |
| 220 | private void waitObj(long ms) { |
| 221 | synchronized (waiter) { |
| 222 | try { |
| 223 | // notify examinerabout to wait on a monitor |
| 224 | notifyWaiter(); |
| 225 | |
| 226 | long base = System.nanoTime(); |
| 227 | setBlockingBaseTime(base); |
| 228 | waiter.wait(ms); |
| 229 | long now = System.nanoTime(); |
| 230 | addWaitTime(now - base); |
| 231 | } catch (Exception e) { |
| 232 | e.printStackTrace(); |
| 233 | System.out.println("Unexpected exception."); |
| 234 | testFailed = true; |
| 235 | } |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | private void test() { |
| 240 | // notify examiner about to block on lockA |
| 241 | notifyWaiter(); |
| 242 | |
| 243 | long base = System.nanoTime(); |
| 244 | setBlockingBaseTime(base); |
| 245 | synchronized (lockA) { |
| 246 | long now = System.nanoTime(); |
| 247 | addBlockedEnterTime(now - base); |
| 248 | |
| 249 | A(); // Expected blocked count = 1 |
| 250 | } |
| 251 | E(); |
| 252 | } |
| 253 | private void A() { |
| 254 | // notify examiner about to block on lockB |
| 255 | notifyWaiter(); |
| 256 | |
| 257 | long base = System.nanoTime(); |
| 258 | setBlockingBaseTime(base); |
| 259 | synchronized (lockB) { |
| 260 | long now = System.nanoTime(); |
| 261 | addBlockedEnterTime(now - base); |
| 262 | |
| 263 | B(); // Expected blocked count = 2 |
| 264 | } |
| 265 | } |
| 266 | private void B() { |
| 267 | // notify examiner about to block on lockC |
| 268 | notifyWaiter(); |
| 269 | |
| 270 | long base = System.nanoTime(); |
| 271 | setBlockingBaseTime(base); |
| 272 | synchronized (lockC) { |
| 273 | long now = System.nanoTime(); |
| 274 | addBlockedEnterTime(now - base); |
| 275 | |
| 276 | C(); // Expected blocked count = 3 |
| 277 | } |
| 278 | } |
| 279 | private void C() { |
| 280 | // notify examiner about to block on lockD |
| 281 | notifyWaiter(); |
| 282 | |
| 283 | long base = System.nanoTime(); |
| 284 | setBlockingBaseTime(base); |
| 285 | synchronized (lockD) { |
| 286 | long now = System.nanoTime(); |
| 287 | addBlockedEnterTime(now - base); |
| 288 | |
| 289 | D(); // Expected blocked count = 4 |
| 290 | } |
| 291 | } |
| 292 | private void D() { |
| 293 | goSleep(50); |
| 294 | } |
| 295 | private void E() { |
| 296 | final int WAIT = 1000; |
| 297 | waitObj(WAIT); |
| 298 | waitObj(WAIT); |
| 299 | waitObj(WAIT); |
| 300 | } |
| 301 | |
| 302 | public void run() { |
| 303 | test(); |
| 304 | } // run() |
| 305 | } // BlockedThread |
| 306 | |
| 307 | static int blockedCount = 0; |
| 308 | static int waitedCount = 0; |
| 309 | static class Examiner extends StatThread { |
| 310 | private BlockedThread blockedThread; |
| 311 | private Semaphore semaphore = new Semaphore(); |
| 312 | |
| 313 | Examiner(String name) { |
| 314 | super(name); |
| 315 | } |
| 316 | |
| 317 | public void setThread(BlockedThread thread) { |
| 318 | blockedThread = thread; |
| 319 | } |
| 320 | |
| 321 | private void blockedTimeRangeCheck(StatThread t, |
| 322 | long blockedTime, |
| 323 | long nowNano) |
| 324 | throws Exception { |
| 325 | long expected = t.totalBlockedTimeMs(nowNano); |
| 326 | |
| 327 | // accept 5% range |
| 328 | timeRangeCheck(blockedTime, expected, 5); |
| 329 | } |
| 330 | private void waitedTimeRangeCheck(StatThread t, |
| 331 | long waitedTime, |
| 332 | long nowNano) |
| 333 | throws Exception { |
| 334 | long expected = t.totalWaitTimeMs(nowNano); |
| 335 | |
| 336 | // accept 5% range |
| 337 | timeRangeCheck(waitedTime, expected, 5); |
| 338 | } |
| 339 | |
| 340 | private void timeRangeCheck(long time, long expected, int percent) |
| 341 | throws Exception { |
| 342 | |
| 343 | double diff = expected - time; |
| 344 | |
| 345 | if (trace) { |
| 346 | System.out.println(" Time = " + time + |
| 347 | " expected = " + expected + |
| 348 | ". Diff = " + diff); |
| 349 | |
| 350 | } |
| 351 | // throw an exception if blockedTime and expectedTime |
| 352 | // differs > percent% |
| 353 | if (diff < 0) { |
| 354 | diff = diff * -1; |
| 355 | } |
| 356 | |
| 357 | long range = (expected * percent) / 100; |
| 358 | // minimum range = 2 ms |
| 359 | if (range < 2) { |
| 360 | range = 2; |
| 361 | } |
| 362 | if (diff > range) { |
| 363 | throw new RuntimeException("TEST FAILED: " + |
| 364 | "Time returned = " + time + |
| 365 | " expected = " + expected + ". Diff = " + diff); |
| 366 | } |
| 367 | } |
| 368 | private void checkInfo(StatThread t, Thread.State s, Object lock, |
| 369 | String lockName, int bcount, int wcount) |
| 370 | throws Exception { |
| 371 | |
| 372 | String action = "ERROR"; |
| 373 | if (s == Thread.State.WAITING || s == Thread.State.TIMED_WAITING) { |
| 374 | action = "wait on "; |
| 375 | } else if (s == Thread.State.BLOCKED) { |
| 376 | action = "block on "; |
| 377 | } |
| 378 | System.out.println(t + " expected to " + action + lockName + |
| 379 | " with blocked count = " + bcount + |
| 380 | " and waited count = " + wcount); |
| 381 | |
| 382 | long now = System.nanoTime(); |
| 383 | ThreadInfo info = mbean.getThreadInfo(t.getId()); |
| 384 | if (info.getThreadState() != s) { |
| 385 | printStack(t, info.getStackTrace()); |
| 386 | throw new RuntimeException("TEST FAILED: " + |
| 387 | "Thread state returned is " + info.getThreadState() + |
| 388 | ". Expected to be " + s); |
| 389 | } |
| 390 | |
| 391 | if (info.getLockName() == null || |
| 392 | !info.getLockName().equals(lock.toString())) { |
| 393 | throw new RuntimeException("TEST FAILED: " + |
| 394 | "getLockName() returned " + info.getLockName() + |
| 395 | ". Expected to be " + lockName + " - " + lock.toString()); |
| 396 | } |
| 397 | |
| 398 | if (info.getBlockedCount() != bcount) { |
| 399 | throw new RuntimeException("TEST FAILED: " + |
| 400 | "Blocked Count returned is " + info.getBlockedCount() + |
| 401 | ". Expected to be " + bcount); |
| 402 | } |
| 403 | if (info.getWaitedCount() != wcount) { |
| 404 | throw new RuntimeException("TEST FAILED: " + |
| 405 | "Waited Count returned is " + info.getWaitedCount() + |
| 406 | ". Expected to be " + wcount); |
| 407 | } |
| 408 | |
| 409 | String lockObj = info.getLockName(); |
| 410 | if (lockObj == null || !lockObj.equals(lock.toString())) { |
| 411 | throw new RuntimeException("TEST FAILED: " + |
| 412 | "Object blocked on is " + lockObj + |
| 413 | ". Expected to be " + lock.toString()); |
| 414 | } |
| 415 | |
| 416 | if (!blockedTimeCheck) { |
| 417 | return; |
| 418 | } |
| 419 | long blockedTime = info.getBlockedTime(); |
| 420 | if (blockedTime < 0) { |
| 421 | throw new RuntimeException("TEST FAILED: " + |
| 422 | "Blocked time returned is negative = " + blockedTime); |
| 423 | } |
| 424 | |
| 425 | if (s == Thread.State.BLOCKED) { |
| 426 | blockedTimeRangeCheck(t, blockedTime, now); |
| 427 | } else { |
| 428 | timeRangeCheck(blockedTime, t.totalBlockedTimeMs(), 5); |
| 429 | } |
| 430 | |
| 431 | long waitedTime = info.getWaitedTime(); |
| 432 | if (waitedTime < 0) { |
| 433 | throw new RuntimeException("TEST FAILED: " + |
| 434 | "Waited time returned is negative = " + waitedTime); |
| 435 | } |
| 436 | if (s == Thread.State.WAITING || s == Thread.State.TIMED_WAITING) { |
| 437 | waitedTimeRangeCheck(t, waitedTime, now); |
| 438 | } else { |
| 439 | timeRangeCheck(waitedTime, t.totalWaitTimeMs(), 5); |
| 440 | } |
| 441 | |
| 442 | } |
| 443 | |
| 444 | private void examine() { |
| 445 | try { |
| 446 | synchronized (lockD) { |
| 447 | synchronized (lockC) { |
| 448 | synchronized (lockB) { |
| 449 | synchronized (lockA) { |
| 450 | // notify main thread to continue |
| 451 | semaphore.semaV(); |
| 452 | |
| 453 | // wait until BlockedThread has started |
| 454 | blockedThread.waitUntilBlocked(); |
| 455 | |
| 456 | blockedCount++; |
| 457 | checkInfo(blockedThread, Thread.State.BLOCKED, |
| 458 | lockA, "lockA", |
| 459 | blockedCount, waitedCount); |
| 460 | } |
| 461 | |
| 462 | // wait until BlockedThread to block on lockB |
| 463 | blockedThread.waitUntilBlocked(); |
| 464 | |
| 465 | blockedCount++; |
| 466 | checkInfo(blockedThread, Thread.State.BLOCKED, |
| 467 | lockB, "lockB", |
| 468 | blockedCount, waitedCount); |
| 469 | } |
| 470 | |
| 471 | // wait until BlockedThread to block on lockC |
| 472 | blockedThread.waitUntilBlocked(); |
| 473 | |
| 474 | blockedCount++; |
| 475 | checkInfo(blockedThread, Thread.State.BLOCKED, |
| 476 | lockC, "lockC", |
| 477 | blockedCount, waitedCount); |
| 478 | } |
| 479 | // wait until BlockedThread to block on lockD |
| 480 | blockedThread.waitUntilBlocked(); |
| 481 | blockedCount++; |
| 482 | |
| 483 | checkInfo(blockedThread, Thread.State.BLOCKED, |
| 484 | lockD, "lockD", |
| 485 | blockedCount, waitedCount); |
| 486 | } |
| 487 | |
| 488 | // wait until BlockedThread about to call E() |
| 489 | // BlockedThread will wait on waiter for 3 times |
| 490 | blockedThread.waitUntilWaiting(); |
| 491 | |
| 492 | waitedCount++; |
| 493 | checkInfo(blockedThread, Thread.State.TIMED_WAITING, |
| 494 | waiter, "waiter", blockedCount, waitedCount); |
| 495 | |
| 496 | blockedThread.waitUntilWaiting(); |
| 497 | |
| 498 | waitedCount++; |
| 499 | checkInfo(blockedThread, Thread.State.TIMED_WAITING, |
| 500 | waiter, "waiter", blockedCount, waitedCount); |
| 501 | |
| 502 | blockedThread.waitUntilWaiting(); |
| 503 | |
| 504 | waitedCount++; |
| 505 | checkInfo(blockedThread, Thread.State.TIMED_WAITING, |
| 506 | waiter, "waiter", blockedCount, waitedCount); |
| 507 | |
| 508 | } catch (Exception e) { |
| 509 | e.printStackTrace(); |
| 510 | System.out.println("Unexpected exception."); |
| 511 | testFailed = true; |
| 512 | } |
| 513 | } |
| 514 | |
| 515 | public void run() { |
| 516 | examine(); |
| 517 | } // run() |
| 518 | |
| 519 | public void waitUntilWaiting() { |
| 520 | semaphore.semaP(); |
| 521 | |
| 522 | // wait until the examiner is waiting for |
| 523 | while (!blockedThread.hasWaitersForBlocked()) { |
| 524 | goSleep(50); |
| 525 | } |
| 526 | // give a chance for the examiner thread to really wait |
| 527 | goSleep(20); |
| 528 | |
| 529 | } |
| 530 | } // Examiner |
| 531 | } |