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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2011, Oracle and/or its affiliates. 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.management; | |
| 27 | + | |
| 28 | +import java.lang.management.ManagementFactory; | |
| 29 | + | |
| 30 | +import java.lang.management.ThreadInfo; | |
| 31 | + | |
| 32 | +import javax.management.ObjectName; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * Implementation class for the thread subsystem. | |
| 36 | + * Standard and committed hotspot-specific metrics if any. | |
| 37 | + * | |
| 38 | + * ManagementFactory.getThreadMXBean() returns an instance | |
| 39 | + * of this class. | |
| 40 | + */ | |
| 41 | +class ThreadImpl implements com.sun.management.ThreadMXBean { | |
| 42 | + | |
| 43 | + private final VMManagement jvm; | |
| 44 | + | |
| 45 | + // default for thread contention monitoring is disabled. | |
| 46 | + private boolean contentionMonitoringEnabled = false; | |
| 47 | + private boolean cpuTimeEnabled; | |
| 48 | + private boolean allocatedMemoryEnabled; | |
| 49 | + | |
| 50 | + /** | |
| 51 | + * Constructor of ThreadImpl class. | |
| 52 | + */ | |
| 53 | + ThreadImpl(VMManagement vm) { | |
| 54 | + this.jvm = vm; | |
| 55 | + this.cpuTimeEnabled = jvm.isThreadCpuTimeEnabled(); | |
| 56 | + this.allocatedMemoryEnabled = jvm.isThreadAllocatedMemoryEnabled(); | |
| 57 | + } | |
| 58 | + | |
| 59 | + public int getThreadCount() { | |
| 60 | + return jvm.getLiveThreadCount(); | |
| 61 | + } | |
| 62 | + | |
| 63 | + public int getPeakThreadCount() { | |
| 64 | + return jvm.getPeakThreadCount(); | |
| 65 | + } | |
| 66 | + | |
| 67 | + public long getTotalStartedThreadCount() { | |
| 68 | + return jvm.getTotalThreadCount(); | |
| 69 | + } | |
| 70 | + | |
| 71 | + public int getDaemonThreadCount() { | |
| 72 | + return jvm.getDaemonThreadCount(); | |
| 73 | + } | |
| 74 | + | |
| 75 | + public boolean isThreadContentionMonitoringSupported() { | |
| 76 | + return jvm.isThreadContentionMonitoringSupported(); | |
| 77 | + } | |
| 78 | + | |
| 79 | + public synchronized boolean isThreadContentionMonitoringEnabled() { | |
| 80 | + if (!isThreadContentionMonitoringSupported()) { | |
| 81 | + throw new UnsupportedOperationException( | |
| 82 | + "Thread contention monitoring is not supported."); | |
| 83 | + } | |
| 84 | + return contentionMonitoringEnabled; | |
| 85 | + } | |
| 86 | + | |
| 87 | + public boolean isThreadCpuTimeSupported() { | |
| 88 | + return jvm.isOtherThreadCpuTimeSupported(); | |
| 89 | + } | |
| 90 | + | |
| 91 | + public boolean isCurrentThreadCpuTimeSupported() { | |
| 92 | + return jvm.isCurrentThreadCpuTimeSupported(); | |
| 93 | + } | |
| 94 | + | |
| 95 | + public boolean isThreadAllocatedMemorySupported() { | |
| 96 | + return jvm.isThreadAllocatedMemorySupported(); | |
| 97 | + } | |
| 98 | + | |
| 99 | + public boolean isThreadCpuTimeEnabled() { | |
| 100 | + if (!isThreadCpuTimeSupported() && | |
| 101 | + !isCurrentThreadCpuTimeSupported()) { | |
| 102 | + throw new UnsupportedOperationException( | |
| 103 | + "Thread CPU time measurement is not supported"); | |
| 104 | + } | |
| 105 | + return cpuTimeEnabled; | |
| 106 | + } | |
| 107 | + | |
| 108 | + public boolean isThreadAllocatedMemoryEnabled() { | |
| 109 | + if (!isThreadAllocatedMemorySupported()) { | |
| 110 | + throw new UnsupportedOperationException( | |
| 111 | + "Thread allocated memory measurement is not supported"); | |
| 112 | + } | |
| 113 | + return allocatedMemoryEnabled; | |
| 114 | + } | |
| 115 | + | |
| 116 | + public long[] getAllThreadIds() { | |
| 117 | + Util.checkMonitorAccess(); | |
| 118 | + | |
| 119 | + Thread[] threads = getThreads(); | |
| 120 | + int length = threads.length; | |
| 121 | + long[] ids = new long[length]; | |
| 122 | + for (int i = 0; i < length; i++) { | |
| 123 | + Thread t = threads[i]; | |
| 124 | + ids[i] = t.getId(); | |
| 125 | + } | |
| 126 | + return ids; | |
| 127 | + } | |
| 128 | + | |
| 129 | + public ThreadInfo getThreadInfo(long id) { | |
| 130 | + long[] ids = new long[1]; | |
| 131 | + ids[0] = id; | |
| 132 | + final ThreadInfo[] infos = getThreadInfo(ids, 0); | |
| 133 | + return infos[0]; | |
| 134 | + } | |
| 135 | + | |
| 136 | + public ThreadInfo getThreadInfo(long id, int maxDepth) { | |
| 137 | + long[] ids = new long[1]; | |
| 138 | + ids[0] = id; | |
| 139 | + final ThreadInfo[] infos = getThreadInfo(ids, maxDepth); | |
| 140 | + return infos[0]; | |
| 141 | + } | |
| 142 | + | |
| 143 | + public ThreadInfo[] getThreadInfo(long[] ids) { | |
| 144 | + return getThreadInfo(ids, 0); | |
| 145 | + } | |
| 146 | + | |
| 147 | + private void verifyThreadIds(long[] ids) { | |
| 148 | + if (ids == null) { | |
| 149 | + throw new NullPointerException("Null ids parameter."); | |
| 150 | + } | |
| 151 | + | |
| 152 | + for (int i = 0; i < ids.length; i++) { | |
| 153 | + if (ids[i] <= 0) { | |
| 154 | + throw new IllegalArgumentException( | |
| 155 | + "Invalid thread ID parameter: " + ids[i]); | |
| 156 | + } | |
| 157 | + } | |
| 158 | + } | |
| 159 | + | |
| 160 | + public ThreadInfo[] getThreadInfo(long[] ids, int maxDepth) { | |
| 161 | + verifyThreadIds(ids); | |
| 162 | + | |
| 163 | + if (maxDepth < 0) { | |
| 164 | + throw new IllegalArgumentException( | |
| 165 | + "Invalid maxDepth parameter: " + maxDepth); | |
| 166 | + } | |
| 167 | + | |
| 168 | + Util.checkMonitorAccess(); | |
| 169 | + | |
| 170 | + ThreadInfo[] infos = new ThreadInfo[ids.length]; // nulls | |
| 171 | + if (maxDepth == Integer.MAX_VALUE) { | |
| 172 | + getThreadInfo1(ids, -1, infos); | |
| 173 | + } else { | |
| 174 | + getThreadInfo1(ids, maxDepth, infos); | |
| 175 | + } | |
| 176 | + return infos; | |
| 177 | + } | |
| 178 | + | |
| 179 | + public void setThreadContentionMonitoringEnabled(boolean enable) { | |
| 180 | + if (!isThreadContentionMonitoringSupported()) { | |
| 181 | + throw new UnsupportedOperationException( | |
| 182 | + "Thread contention monitoring is not supported"); | |
| 183 | + } | |
| 184 | + | |
| 185 | + Util.checkControlAccess(); | |
| 186 | + | |
| 187 | + synchronized (this) { | |
| 188 | + if (contentionMonitoringEnabled != enable) { | |
| 189 | + if (enable) { | |
| 190 | + // if reeabled, reset contention time statistics | |
| 191 | + // for all threads | |
| 192 | + resetContentionTimes0(0); | |
| 193 | + } | |
| 194 | + | |
| 195 | + // update the VM of the state change | |
| 196 | + setThreadContentionMonitoringEnabled0(enable); | |
| 197 | + | |
| 198 | + contentionMonitoringEnabled = enable; | |
| 199 | + } | |
| 200 | + } | |
| 201 | + } | |
| 202 | + | |
| 203 | + private boolean verifyCurrentThreadCpuTime() { | |
| 204 | + // check if Thread CPU time measurement is supported. | |
| 205 | + if (!isCurrentThreadCpuTimeSupported()) { | |
| 206 | + throw new UnsupportedOperationException( | |
| 207 | + "Current thread CPU time measurement is not supported."); | |
| 208 | + } | |
| 209 | + return isThreadCpuTimeEnabled(); | |
| 210 | + } | |
| 211 | + | |
| 212 | + public long getCurrentThreadCpuTime() { | |
| 213 | + if (verifyCurrentThreadCpuTime()) { | |
| 214 | + return getThreadTotalCpuTime0(0); | |
| 215 | + } | |
| 216 | + return -1; | |
| 217 | + } | |
| 218 | + | |
| 219 | + public long getThreadCpuTime(long id) { | |
| 220 | + long[] ids = new long[1]; | |
| 221 | + ids[0] = id; | |
| 222 | + final long[] times = getThreadCpuTime(ids); | |
| 223 | + return times[0]; | |
| 224 | + } | |
| 225 | + | |
| 226 | + private boolean verifyThreadCpuTime(long[] ids) { | |
| 227 | + verifyThreadIds(ids); | |
| 228 | + | |
| 229 | + // check if Thread CPU time measurement is supported. | |
| 230 | + if (!isThreadCpuTimeSupported() && | |
| 231 | + !isCurrentThreadCpuTimeSupported()) { | |
| 232 | + throw new UnsupportedOperationException( | |
| 233 | + "Thread CPU time measurement is not supported."); | |
| 234 | + } | |
| 235 | + | |
| 236 | + if (!isThreadCpuTimeSupported()) { | |
| 237 | + // support current thread only | |
| 238 | + for (int i = 0; i < ids.length; i++) { | |
| 239 | + if (ids[i] != Thread.currentThread().getId()) { | |
| 240 | + throw new UnsupportedOperationException( | |
| 241 | + "Thread CPU time measurement is only supported" + | |
| 242 | + " for the current thread."); | |
| 243 | + } | |
| 244 | + } | |
| 245 | + } | |
| 246 | + | |
| 247 | + return isThreadCpuTimeEnabled(); | |
| 248 | + } | |
| 249 | + | |
| 250 | + public long[] getThreadCpuTime(long[] ids) { | |
| 251 | + boolean verified = verifyThreadCpuTime(ids); | |
| 252 | + | |
| 253 | + int length = ids.length; | |
| 254 | + long[] times = new long[length]; | |
| 255 | + java.util.Arrays.fill(times, -1); | |
| 256 | + | |
| 257 | + if (verified) { | |
| 258 | + if (length == 1) { | |
| 259 | + long id = ids[0]; | |
| 260 | + if (id == Thread.currentThread().getId()) { | |
| 261 | + id = 0; | |
| 262 | + } | |
| 263 | + times[0] = getThreadTotalCpuTime0(id); | |
| 264 | + } else { | |
| 265 | + getThreadTotalCpuTime1(ids, times); | |
| 266 | + } | |
| 267 | + } | |
| 268 | + return times; | |
| 269 | + } | |
| 270 | + | |
| 271 | + public long getCurrentThreadUserTime() { | |
| 272 | + if (verifyCurrentThreadCpuTime()) { | |
| 273 | + return getThreadUserCpuTime0(0); | |
| 274 | + } | |
| 275 | + return -1; | |
| 276 | + } | |
| 277 | + | |
| 278 | + public long getThreadUserTime(long id) { | |
| 279 | + long[] ids = new long[1]; | |
| 280 | + ids[0] = id; | |
| 281 | + final long[] times = getThreadUserTime(ids); | |
| 282 | + return times[0]; | |
| 283 | + } | |
| 284 | + | |
| 285 | + public long[] getThreadUserTime(long[] ids) { | |
| 286 | + boolean verified = verifyThreadCpuTime(ids); | |
| 287 | + | |
| 288 | + int length = ids.length; | |
| 289 | + long[] times = new long[length]; | |
| 290 | + java.util.Arrays.fill(times, -1); | |
| 291 | + | |
| 292 | + if (verified) { | |
| 293 | + if (length == 1) { | |
| 294 | + long id = ids[0]; | |
| 295 | + if (id == Thread.currentThread().getId()) { | |
| 296 | + id = 0; | |
| 297 | + } | |
| 298 | + times[0] = getThreadUserCpuTime0(id); | |
| 299 | + } else { | |
| 300 | + getThreadUserCpuTime1(ids, times); | |
| 301 | + } | |
| 302 | + } | |
| 303 | + return times; | |
| 304 | + } | |
| 305 | + | |
| 306 | + public void setThreadCpuTimeEnabled(boolean enable) { | |
| 307 | + if (!isThreadCpuTimeSupported() && | |
| 308 | + !isCurrentThreadCpuTimeSupported()) { | |
| 309 | + throw new UnsupportedOperationException( | |
| 310 | + "Thread CPU time measurement is not supported"); | |
| 311 | + } | |
| 312 | + | |
| 313 | + Util.checkControlAccess(); | |
| 314 | + synchronized (this) { | |
| 315 | + if (cpuTimeEnabled != enable) { | |
| 316 | + // notify VM of the state change | |
| 317 | + setThreadCpuTimeEnabled0(enable); | |
| 318 | + cpuTimeEnabled = enable; | |
| 319 | + } | |
| 320 | + } | |
| 321 | + } | |
| 322 | + | |
| 323 | + public long getThreadAllocatedBytes(long id) { | |
| 324 | + long[] ids = new long[1]; | |
| 325 | + ids[0] = id; | |
| 326 | + final long[] sizes = getThreadAllocatedBytes(ids); | |
| 327 | + return sizes[0]; | |
| 328 | + } | |
| 329 | + | |
| 330 | + private boolean verifyThreadAllocatedMemory(long[] ids) { | |
| 331 | + verifyThreadIds(ids); | |
| 332 | + | |
| 333 | + // check if Thread allocated memory measurement is supported. | |
| 334 | + if (!isThreadAllocatedMemorySupported()) { | |
| 335 | + throw new UnsupportedOperationException( | |
| 336 | + "Thread allocated memory measurement is not supported."); | |
| 337 | + } | |
| 338 | + | |
| 339 | + return isThreadAllocatedMemoryEnabled(); | |
| 340 | + } | |
| 341 | + | |
| 342 | + public long[] getThreadAllocatedBytes(long[] ids) { | |
| 343 | + boolean verified = verifyThreadAllocatedMemory(ids); | |
| 344 | + | |
| 345 | + long[] sizes = new long[ids.length]; | |
| 346 | + java.util.Arrays.fill(sizes, -1); | |
| 347 | + | |
| 348 | + if (verified) { | |
| 349 | + getThreadAllocatedMemory1(ids, sizes); | |
| 350 | + } | |
| 351 | + return sizes; | |
| 352 | + } | |
| 353 | + | |
| 354 | + public void setThreadAllocatedMemoryEnabled(boolean enable) { | |
| 355 | + if (!isThreadAllocatedMemorySupported()) { | |
| 356 | + throw new UnsupportedOperationException( | |
| 357 | + "Thread allocated memory measurement is not supported."); | |
| 358 | + } | |
| 359 | + | |
| 360 | + Util.checkControlAccess(); | |
| 361 | + synchronized (this) { | |
| 362 | + if (allocatedMemoryEnabled != enable) { | |
| 363 | + // notify VM of the state change | |
| 364 | + setThreadAllocatedMemoryEnabled0(enable); | |
| 365 | + allocatedMemoryEnabled = enable; | |
| 366 | + } | |
| 367 | + } | |
| 368 | + } | |
| 369 | + | |
| 370 | + public long[] findMonitorDeadlockedThreads() { | |
| 371 | + Util.checkMonitorAccess(); | |
| 372 | + | |
| 373 | + Thread[] threads = findMonitorDeadlockedThreads0(); | |
| 374 | + if (threads == null) { | |
| 375 | + return null; | |
| 376 | + } | |
| 377 | + | |
| 378 | + long[] ids = new long[threads.length]; | |
| 379 | + for (int i = 0; i < threads.length; i++) { | |
| 380 | + Thread t = threads[i]; | |
| 381 | + ids[i] = t.getId(); | |
| 382 | + } | |
| 383 | + return ids; | |
| 384 | + } | |
| 385 | + | |
| 386 | + public long[] findDeadlockedThreads() { | |
| 387 | + if (!isSynchronizerUsageSupported()) { | |
| 388 | + throw new UnsupportedOperationException( | |
| 389 | + "Monitoring of Synchronizer Usage is not supported."); | |
| 390 | + } | |
| 391 | + | |
| 392 | + Util.checkMonitorAccess(); | |
| 393 | + | |
| 394 | + Thread[] threads = findDeadlockedThreads0(); | |
| 395 | + if (threads == null) { | |
| 396 | + return null; | |
| 397 | + } | |
| 398 | + | |
| 399 | + long[] ids = new long[threads.length]; | |
| 400 | + for (int i = 0; i < threads.length; i++) { | |
| 401 | + Thread t = threads[i]; | |
| 402 | + ids[i] = t.getId(); | |
| 403 | + } | |
| 404 | + return ids; | |
| 405 | + } | |
| 406 | + | |
| 407 | + public void resetPeakThreadCount() { | |
| 408 | + Util.checkControlAccess(); | |
| 409 | + resetPeakThreadCount0(); | |
| 410 | + } | |
| 411 | + | |
| 412 | + public boolean isObjectMonitorUsageSupported() { | |
| 413 | + return jvm.isObjectMonitorUsageSupported(); | |
| 414 | + } | |
| 415 | + | |
| 416 | + public boolean isSynchronizerUsageSupported() { | |
| 417 | + return jvm.isSynchronizerUsageSupported(); | |
| 418 | + } | |
| 419 | + | |
| 420 | + private void verifyDumpThreads(boolean lockedMonitors, | |
| 421 | + boolean lockedSynchronizers) { | |
| 422 | + if (lockedMonitors && !isObjectMonitorUsageSupported()) { | |
| 423 | + throw new UnsupportedOperationException( | |
| 424 | + "Monitoring of Object Monitor Usage is not supported."); | |
| 425 | + } | |
| 426 | + | |
| 427 | + if (lockedSynchronizers && !isSynchronizerUsageSupported()) { | |
| 428 | + throw new UnsupportedOperationException( | |
| 429 | + "Monitoring of Synchronizer Usage is not supported."); | |
| 430 | + } | |
| 431 | + | |
| 432 | + Util.checkMonitorAccess(); | |
| 433 | + } | |
| 434 | + | |
| 435 | + public ThreadInfo[] getThreadInfo(long[] ids, | |
| 436 | + boolean lockedMonitors, | |
| 437 | + boolean lockedSynchronizers) { | |
| 438 | + verifyThreadIds(ids); | |
| 439 | + verifyDumpThreads(lockedMonitors, lockedSynchronizers); | |
| 440 | + return dumpThreads0(ids, lockedMonitors, lockedSynchronizers); | |
| 441 | + } | |
| 442 | + | |
| 443 | + public ThreadInfo[] dumpAllThreads(boolean lockedMonitors, | |
| 444 | + boolean lockedSynchronizers) { | |
| 445 | + verifyDumpThreads(lockedMonitors, lockedSynchronizers); | |
| 446 | + return dumpThreads0(null, lockedMonitors, lockedSynchronizers); | |
| 447 | + } | |
| 448 | + | |
| 449 | + // VM support where maxDepth == -1 to request entire stack dump | |
| 450 | + private static native Thread[] getThreads(); | |
| 451 | + private static native void getThreadInfo1(long[] ids, | |
| 452 | + int maxDepth, | |
| 453 | + ThreadInfo[] result); | |
| 454 | + private static native long getThreadTotalCpuTime0(long id); | |
| 455 | + private static native void getThreadTotalCpuTime1(long[] ids, long[] result); | |
| 456 | + private static native long getThreadUserCpuTime0(long id); | |
| 457 | + private static native void getThreadUserCpuTime1(long[] ids, long[] result); | |
| 458 | + private static native void getThreadAllocatedMemory1(long[] ids, long[] result); | |
| 459 | + private static native void setThreadCpuTimeEnabled0(boolean enable); | |
| 460 | + private static native void setThreadAllocatedMemoryEnabled0(boolean enable); | |
| 461 | + private static native void setThreadContentionMonitoringEnabled0(boolean enable); | |
| 462 | + private static native Thread[] findMonitorDeadlockedThreads0(); | |
| 463 | + private static native Thread[] findDeadlockedThreads0(); | |
| 464 | + private static native void resetPeakThreadCount0(); | |
| 465 | + private static native ThreadInfo[] dumpThreads0(long[] ids, | |
| 466 | + boolean lockedMonitors, | |
| 467 | + boolean lockedSynchronizers); | |
| 468 | + | |
| 469 | + // tid == 0 to reset contention times for all threads | |
| 470 | + private static native void resetContentionTimes0(long tid); | |
| 471 | + | |
| 472 | + public ObjectName getObjectName() { | |
| 473 | + return Util.newObjectName(ManagementFactory.THREAD_MXBEAN_NAME); | |
| 474 | + } | |
| 475 | + | |
| 476 | +} | |