Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.cpp @ 6842:b9a9ed0f8eeb
7197424: update copyright year to match last edit in jdk8 hotspot repository
Summary: Update copyright year to 2012 for relevant files
Reviewed-by: dholmes, coleenp
| author | mikael |
|---|---|
| date | Tue, 09 Oct 2012 10:09:34 -0700 |
| parents | d2a62e0f25eb |
| children | 63a4eb8bcd23 78bbf4d43a14 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/gcTaskThread.hpp" | |
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28 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" |
| 1972 | 29 #include "memory/allocation.hpp" |
| 30 #include "memory/allocation.inline.hpp" | |
| 31 #include "runtime/mutex.hpp" | |
| 32 #include "runtime/mutexLocker.hpp" | |
| 0 | 33 |
| 34 // | |
| 35 // GCTask | |
| 36 // | |
| 37 | |
| 38 const char* GCTask::Kind::to_string(kind value) { | |
| 39 const char* result = "unknown GCTask kind"; | |
| 40 switch (value) { | |
| 41 default: | |
| 42 result = "unknown GCTask kind"; | |
| 43 break; | |
| 44 case unknown_task: | |
| 45 result = "unknown task"; | |
| 46 break; | |
| 47 case ordinary_task: | |
| 48 result = "ordinary task"; | |
| 49 break; | |
| 50 case barrier_task: | |
| 51 result = "barrier task"; | |
| 52 break; | |
| 53 case noop_task: | |
| 54 result = "noop task"; | |
| 55 break; | |
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56 case idle_task: |
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57 result = "idle task"; |
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58 break; |
| 0 | 59 } |
| 60 return result; | |
| 61 }; | |
| 62 | |
| 63 GCTask::GCTask() : | |
| 64 _kind(Kind::ordinary_task), | |
| 65 _affinity(GCTaskManager::sentinel_worker()){ | |
| 66 initialize(); | |
| 67 } | |
| 68 | |
| 69 GCTask::GCTask(Kind::kind kind) : | |
| 70 _kind(kind), | |
| 71 _affinity(GCTaskManager::sentinel_worker()) { | |
| 72 initialize(); | |
| 73 } | |
| 74 | |
| 75 GCTask::GCTask(uint affinity) : | |
| 76 _kind(Kind::ordinary_task), | |
| 77 _affinity(affinity) { | |
| 78 initialize(); | |
| 79 } | |
| 80 | |
| 81 GCTask::GCTask(Kind::kind kind, uint affinity) : | |
| 82 _kind(kind), | |
| 83 _affinity(affinity) { | |
| 84 initialize(); | |
| 85 } | |
| 86 | |
| 87 void GCTask::initialize() { | |
| 88 _older = NULL; | |
| 89 _newer = NULL; | |
| 90 } | |
| 91 | |
| 92 void GCTask::destruct() { | |
| 93 assert(older() == NULL, "shouldn't have an older task"); | |
| 94 assert(newer() == NULL, "shouldn't have a newer task"); | |
| 95 // Nothing to do. | |
| 96 } | |
| 97 | |
| 98 NOT_PRODUCT( | |
| 99 void GCTask::print(const char* message) const { | |
| 100 tty->print(INTPTR_FORMAT " <- " INTPTR_FORMAT "(%u) -> " INTPTR_FORMAT, | |
| 101 newer(), this, affinity(), older()); | |
| 102 } | |
| 103 ) | |
| 104 | |
| 105 // | |
| 106 // GCTaskQueue | |
| 107 // | |
| 108 | |
| 109 GCTaskQueue* GCTaskQueue::create() { | |
| 110 GCTaskQueue* result = new GCTaskQueue(false); | |
| 111 if (TraceGCTaskQueue) { | |
| 112 tty->print_cr("GCTaskQueue::create()" | |
| 113 " returns " INTPTR_FORMAT, result); | |
| 114 } | |
| 115 return result; | |
| 116 } | |
| 117 | |
| 118 GCTaskQueue* GCTaskQueue::create_on_c_heap() { | |
| 6197 | 119 GCTaskQueue* result = new(ResourceObj::C_HEAP, mtGC) GCTaskQueue(true); |
| 0 | 120 if (TraceGCTaskQueue) { |
| 121 tty->print_cr("GCTaskQueue::create_on_c_heap()" | |
| 122 " returns " INTPTR_FORMAT, | |
| 123 result); | |
| 124 } | |
| 125 return result; | |
| 126 } | |
| 127 | |
| 128 GCTaskQueue::GCTaskQueue(bool on_c_heap) : | |
| 129 _is_c_heap_obj(on_c_heap) { | |
| 130 initialize(); | |
| 131 if (TraceGCTaskQueue) { | |
| 132 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 133 " GCTaskQueue::GCTaskQueue() constructor", | |
| 134 this); | |
| 135 } | |
| 136 } | |
| 137 | |
| 138 void GCTaskQueue::destruct() { | |
| 139 // Nothing to do. | |
| 140 } | |
| 141 | |
| 142 void GCTaskQueue::destroy(GCTaskQueue* that) { | |
| 143 if (TraceGCTaskQueue) { | |
| 144 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 145 " GCTaskQueue::destroy()" | |
| 146 " is_c_heap_obj: %s", | |
| 147 that, | |
| 148 that->is_c_heap_obj() ? "true" : "false"); | |
| 149 } | |
| 150 // That instance may have been allocated as a CHeapObj, | |
| 151 // in which case we have to free it explicitly. | |
| 152 if (that != NULL) { | |
| 153 that->destruct(); | |
| 154 assert(that->is_empty(), "should be empty"); | |
| 155 if (that->is_c_heap_obj()) { | |
| 156 FreeHeap(that); | |
| 157 } | |
| 158 } | |
| 159 } | |
| 160 | |
| 161 void GCTaskQueue::initialize() { | |
| 162 set_insert_end(NULL); | |
| 163 set_remove_end(NULL); | |
| 164 set_length(0); | |
| 165 } | |
| 166 | |
| 167 // Enqueue one task. | |
| 168 void GCTaskQueue::enqueue(GCTask* task) { | |
| 169 if (TraceGCTaskQueue) { | |
| 170 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 171 " GCTaskQueue::enqueue(task: " | |
| 172 INTPTR_FORMAT ")", | |
| 173 this, task); | |
| 174 print("before:"); | |
| 175 } | |
| 176 assert(task != NULL, "shouldn't have null task"); | |
| 177 assert(task->older() == NULL, "shouldn't be on queue"); | |
| 178 assert(task->newer() == NULL, "shouldn't be on queue"); | |
| 179 task->set_newer(NULL); | |
| 180 task->set_older(insert_end()); | |
| 181 if (is_empty()) { | |
| 182 set_remove_end(task); | |
| 183 } else { | |
| 184 insert_end()->set_newer(task); | |
| 185 } | |
| 186 set_insert_end(task); | |
| 187 increment_length(); | |
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188 verify_length(); |
| 0 | 189 if (TraceGCTaskQueue) { |
| 190 print("after:"); | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 // Enqueue a whole list of tasks. Empties the argument list. | |
| 195 void GCTaskQueue::enqueue(GCTaskQueue* list) { | |
| 196 if (TraceGCTaskQueue) { | |
| 197 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 198 " GCTaskQueue::enqueue(list: " | |
| 199 INTPTR_FORMAT ")", | |
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200 this, list); |
| 0 | 201 print("before:"); |
| 202 list->print("list:"); | |
| 203 } | |
| 204 if (list->is_empty()) { | |
| 205 // Enqueuing the empty list: nothing to do. | |
| 206 return; | |
| 207 } | |
| 208 uint list_length = list->length(); | |
| 209 if (is_empty()) { | |
| 210 // Enqueuing to empty list: just acquire elements. | |
| 211 set_insert_end(list->insert_end()); | |
| 212 set_remove_end(list->remove_end()); | |
| 213 set_length(list_length); | |
| 214 } else { | |
| 215 // Prepend argument list to our queue. | |
| 216 list->remove_end()->set_older(insert_end()); | |
| 217 insert_end()->set_newer(list->remove_end()); | |
| 218 set_insert_end(list->insert_end()); | |
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219 set_length(length() + list_length); |
| 0 | 220 // empty the argument list. |
| 221 } | |
| 222 list->initialize(); | |
| 223 if (TraceGCTaskQueue) { | |
| 224 print("after:"); | |
| 225 list->print("list:"); | |
| 226 } | |
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227 verify_length(); |
| 0 | 228 } |
| 229 | |
| 230 // Dequeue one task. | |
| 231 GCTask* GCTaskQueue::dequeue() { | |
| 232 if (TraceGCTaskQueue) { | |
| 233 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 234 " GCTaskQueue::dequeue()", this); | |
| 235 print("before:"); | |
| 236 } | |
| 237 assert(!is_empty(), "shouldn't dequeue from empty list"); | |
| 238 GCTask* result = remove(); | |
| 239 assert(result != NULL, "shouldn't have NULL task"); | |
| 240 if (TraceGCTaskQueue) { | |
| 241 tty->print_cr(" return: " INTPTR_FORMAT, result); | |
| 242 print("after:"); | |
| 243 } | |
| 244 return result; | |
| 245 } | |
| 246 | |
| 247 // Dequeue one task, preferring one with affinity. | |
| 248 GCTask* GCTaskQueue::dequeue(uint affinity) { | |
| 249 if (TraceGCTaskQueue) { | |
| 250 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 251 " GCTaskQueue::dequeue(%u)", this, affinity); | |
| 252 print("before:"); | |
| 253 } | |
| 254 assert(!is_empty(), "shouldn't dequeue from empty list"); | |
| 255 // Look down to the next barrier for a task with this affinity. | |
| 256 GCTask* result = NULL; | |
| 257 for (GCTask* element = remove_end(); | |
| 258 element != NULL; | |
| 259 element = element->newer()) { | |
| 260 if (element->is_barrier_task()) { | |
| 261 // Don't consider barrier tasks, nor past them. | |
| 262 result = NULL; | |
| 263 break; | |
| 264 } | |
| 265 if (element->affinity() == affinity) { | |
| 266 result = remove(element); | |
| 267 break; | |
| 268 } | |
| 269 } | |
| 270 // If we didn't find anything with affinity, just take the next task. | |
| 271 if (result == NULL) { | |
| 272 result = remove(); | |
| 273 } | |
| 274 if (TraceGCTaskQueue) { | |
| 275 tty->print_cr(" return: " INTPTR_FORMAT, result); | |
| 276 print("after:"); | |
| 277 } | |
| 278 return result; | |
| 279 } | |
| 280 | |
| 281 GCTask* GCTaskQueue::remove() { | |
| 282 // Dequeue from remove end. | |
| 283 GCTask* result = remove_end(); | |
| 284 assert(result != NULL, "shouldn't have null task"); | |
| 285 assert(result->older() == NULL, "not the remove_end"); | |
| 286 set_remove_end(result->newer()); | |
| 287 if (remove_end() == NULL) { | |
| 288 assert(insert_end() == result, "not a singleton"); | |
| 289 set_insert_end(NULL); | |
| 290 } else { | |
| 291 remove_end()->set_older(NULL); | |
| 292 } | |
| 293 result->set_newer(NULL); | |
| 294 decrement_length(); | |
| 295 assert(result->newer() == NULL, "shouldn't be on queue"); | |
| 296 assert(result->older() == NULL, "shouldn't be on queue"); | |
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297 verify_length(); |
| 0 | 298 return result; |
| 299 } | |
| 300 | |
| 301 GCTask* GCTaskQueue::remove(GCTask* task) { | |
| 302 // This is slightly more work, and has slightly fewer asserts | |
| 303 // than removing from the remove end. | |
| 304 assert(task != NULL, "shouldn't have null task"); | |
| 305 GCTask* result = task; | |
| 306 if (result->newer() != NULL) { | |
| 307 result->newer()->set_older(result->older()); | |
| 308 } else { | |
| 309 assert(insert_end() == result, "not youngest"); | |
| 310 set_insert_end(result->older()); | |
| 311 } | |
| 312 if (result->older() != NULL) { | |
| 313 result->older()->set_newer(result->newer()); | |
| 314 } else { | |
| 315 assert(remove_end() == result, "not oldest"); | |
| 316 set_remove_end(result->newer()); | |
| 317 } | |
| 318 result->set_newer(NULL); | |
| 319 result->set_older(NULL); | |
| 320 decrement_length(); | |
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321 verify_length(); |
| 0 | 322 return result; |
| 323 } | |
| 324 | |
| 325 NOT_PRODUCT( | |
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326 // Count the elements in the queue and verify the length against |
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327 // that count. |
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328 void GCTaskQueue::verify_length() const { |
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329 uint count = 0; |
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330 for (GCTask* element = insert_end(); |
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331 element != NULL; |
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332 element = element->older()) { |
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333 |
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334 count++; |
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335 } |
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336 assert(count == length(), "Length does not match queue"); |
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337 } |
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338 |
| 0 | 339 void GCTaskQueue::print(const char* message) const { |
| 340 tty->print_cr("[" INTPTR_FORMAT "] GCTaskQueue:" | |
| 341 " insert_end: " INTPTR_FORMAT | |
| 342 " remove_end: " INTPTR_FORMAT | |
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343 " length: %d" |
| 0 | 344 " %s", |
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345 this, insert_end(), remove_end(), length(), message); |
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346 uint count = 0; |
| 0 | 347 for (GCTask* element = insert_end(); |
| 348 element != NULL; | |
| 349 element = element->older()) { | |
| 350 element->print(" "); | |
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351 count++; |
| 0 | 352 tty->cr(); |
| 353 } | |
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354 tty->print("Total tasks: %d", count); |
| 0 | 355 } |
| 356 ) | |
| 357 | |
| 358 // | |
| 359 // SynchronizedGCTaskQueue | |
| 360 // | |
| 361 | |
| 362 SynchronizedGCTaskQueue::SynchronizedGCTaskQueue(GCTaskQueue* queue_arg, | |
| 363 Monitor * lock_arg) : | |
| 364 _unsynchronized_queue(queue_arg), | |
| 365 _lock(lock_arg) { | |
| 366 assert(unsynchronized_queue() != NULL, "null queue"); | |
| 367 assert(lock() != NULL, "null lock"); | |
| 368 } | |
| 369 | |
| 370 SynchronizedGCTaskQueue::~SynchronizedGCTaskQueue() { | |
| 371 // Nothing to do. | |
| 372 } | |
| 373 | |
| 374 // | |
| 375 // GCTaskManager | |
| 376 // | |
| 377 GCTaskManager::GCTaskManager(uint workers) : | |
| 378 _workers(workers), | |
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379 _active_workers(0), |
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380 _idle_workers(0), |
| 0 | 381 _ndc(NULL) { |
| 382 initialize(); | |
| 383 } | |
| 384 | |
| 385 GCTaskManager::GCTaskManager(uint workers, NotifyDoneClosure* ndc) : | |
| 386 _workers(workers), | |
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387 _active_workers(0), |
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388 _idle_workers(0), |
| 0 | 389 _ndc(ndc) { |
| 390 initialize(); | |
| 391 } | |
| 392 | |
| 393 void GCTaskManager::initialize() { | |
| 394 if (TraceGCTaskManager) { | |
| 395 tty->print_cr("GCTaskManager::initialize: workers: %u", workers()); | |
| 396 } | |
| 397 assert(workers() != 0, "no workers"); | |
| 398 _monitor = new Monitor(Mutex::barrier, // rank | |
| 399 "GCTaskManager monitor", // name | |
| 400 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 401 // The queue for the GCTaskManager must be a CHeapObj. | |
| 402 GCTaskQueue* unsynchronized_queue = GCTaskQueue::create_on_c_heap(); | |
| 403 _queue = SynchronizedGCTaskQueue::create(unsynchronized_queue, lock()); | |
| 404 _noop_task = NoopGCTask::create_on_c_heap(); | |
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405 _idle_inactive_task = WaitForBarrierGCTask::create_on_c_heap(); |
| 6197 | 406 _resource_flag = NEW_C_HEAP_ARRAY(bool, workers(), mtGC); |
| 0 | 407 { |
| 408 // Set up worker threads. | |
| 409 // Distribute the workers among the available processors, | |
| 410 // unless we were told not to, or if the os doesn't want to. | |
| 6197 | 411 uint* processor_assignment = NEW_C_HEAP_ARRAY(uint, workers(), mtGC); |
| 0 | 412 if (!BindGCTaskThreadsToCPUs || |
| 413 !os::distribute_processes(workers(), processor_assignment)) { | |
| 414 for (uint a = 0; a < workers(); a += 1) { | |
| 415 processor_assignment[a] = sentinel_worker(); | |
| 416 } | |
| 417 } | |
| 6197 | 418 _thread = NEW_C_HEAP_ARRAY(GCTaskThread*, workers(), mtGC); |
| 0 | 419 for (uint t = 0; t < workers(); t += 1) { |
| 420 set_thread(t, GCTaskThread::create(this, t, processor_assignment[t])); | |
| 421 } | |
| 422 if (TraceGCTaskThread) { | |
| 423 tty->print("GCTaskManager::initialize: distribution:"); | |
| 424 for (uint t = 0; t < workers(); t += 1) { | |
| 425 tty->print(" %u", processor_assignment[t]); | |
| 426 } | |
| 427 tty->cr(); | |
| 428 } | |
| 6197 | 429 FREE_C_HEAP_ARRAY(uint, processor_assignment, mtGC); |
| 0 | 430 } |
| 431 reset_busy_workers(); | |
| 432 set_unblocked(); | |
| 433 for (uint w = 0; w < workers(); w += 1) { | |
| 434 set_resource_flag(w, false); | |
| 435 } | |
| 436 reset_delivered_tasks(); | |
| 437 reset_completed_tasks(); | |
| 438 reset_noop_tasks(); | |
| 439 reset_barriers(); | |
| 440 reset_emptied_queue(); | |
| 441 for (uint s = 0; s < workers(); s += 1) { | |
| 442 thread(s)->start(); | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 GCTaskManager::~GCTaskManager() { | |
| 447 assert(busy_workers() == 0, "still have busy workers"); | |
| 448 assert(queue()->is_empty(), "still have queued work"); | |
| 449 NoopGCTask::destroy(_noop_task); | |
| 450 _noop_task = NULL; | |
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451 WaitForBarrierGCTask::destroy(_idle_inactive_task); |
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452 _idle_inactive_task = NULL; |
| 0 | 453 if (_thread != NULL) { |
| 454 for (uint i = 0; i < workers(); i += 1) { | |
| 455 GCTaskThread::destroy(thread(i)); | |
| 456 set_thread(i, NULL); | |
| 457 } | |
| 6197 | 458 FREE_C_HEAP_ARRAY(GCTaskThread*, _thread, mtGC); |
| 0 | 459 _thread = NULL; |
| 460 } | |
| 461 if (_resource_flag != NULL) { | |
| 6197 | 462 FREE_C_HEAP_ARRAY(bool, _resource_flag, mtGC); |
| 0 | 463 _resource_flag = NULL; |
| 464 } | |
| 465 if (queue() != NULL) { | |
| 466 GCTaskQueue* unsynchronized_queue = queue()->unsynchronized_queue(); | |
| 467 GCTaskQueue::destroy(unsynchronized_queue); | |
| 468 SynchronizedGCTaskQueue::destroy(queue()); | |
| 469 _queue = NULL; | |
| 470 } | |
| 471 if (monitor() != NULL) { | |
| 472 delete monitor(); | |
| 473 _monitor = NULL; | |
| 474 } | |
| 475 } | |
| 476 | |
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477 void GCTaskManager::set_active_gang() { |
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478 _active_workers = |
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479 AdaptiveSizePolicy::calc_active_workers(workers(), |
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480 active_workers(), |
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481 Threads::number_of_non_daemon_threads()); |
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482 |
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483 assert(!all_workers_active() || active_workers() == ParallelGCThreads, |
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484 err_msg("all_workers_active() is incorrect: " |
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485 "active %d ParallelGCThreads %d", active_workers(), |
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486 ParallelGCThreads)); |
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487 if (TraceDynamicGCThreads) { |
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488 gclog_or_tty->print_cr("GCTaskManager::set_active_gang(): " |
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489 "all_workers_active() %d workers %d " |
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490 "active %d ParallelGCThreads %d ", |
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491 all_workers_active(), workers(), active_workers(), |
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492 ParallelGCThreads); |
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493 } |
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494 } |
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495 |
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496 // Create IdleGCTasks for inactive workers. |
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497 // Creates tasks in a ResourceArea and assumes |
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498 // an appropriate ResourceMark. |
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499 void GCTaskManager::task_idle_workers() { |
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500 { |
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501 int more_inactive_workers = 0; |
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502 { |
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503 // Stop any idle tasks from exiting their IdleGCTask's |
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504 // and get the count for additional IdleGCTask's under |
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505 // the GCTaskManager's monitor so that the "more_inactive_workers" |
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506 // count is correct. |
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507 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
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508 _idle_inactive_task->set_should_wait(true); |
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509 // active_workers are a number being requested. idle_workers |
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510 // are the number currently idle. If all the workers are being |
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511 // requested to be active but some are already idle, reduce |
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512 // the number of active_workers to be consistent with the |
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513 // number of idle_workers. The idle_workers are stuck in |
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514 // idle tasks and will no longer be release (since a new GC |
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515 // is starting). Try later to release enough idle_workers |
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516 // to allow the desired number of active_workers. |
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517 more_inactive_workers = |
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518 workers() - active_workers() - idle_workers(); |
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519 if (more_inactive_workers < 0) { |
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520 int reduced_active_workers = active_workers() + more_inactive_workers; |
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521 set_active_workers(reduced_active_workers); |
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522 more_inactive_workers = 0; |
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523 } |
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524 if (TraceDynamicGCThreads) { |
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525 gclog_or_tty->print_cr("JT: %d workers %d active %d " |
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526 "idle %d more %d", |
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527 Threads::number_of_non_daemon_threads(), |
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528 workers(), |
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529 active_workers(), |
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530 idle_workers(), |
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531 more_inactive_workers); |
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532 } |
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533 } |
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534 GCTaskQueue* q = GCTaskQueue::create(); |
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535 for(uint i = 0; i < (uint) more_inactive_workers; i++) { |
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536 q->enqueue(IdleGCTask::create_on_c_heap()); |
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537 increment_idle_workers(); |
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538 } |
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539 assert(workers() == active_workers() + idle_workers(), |
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540 "total workers should equal active + inactive"); |
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541 add_list(q); |
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542 // GCTaskQueue* q was created in a ResourceArea so a |
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543 // destroy() call is not needed. |
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544 } |
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545 } |
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546 |
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547 void GCTaskManager::release_idle_workers() { |
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548 { |
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549 MutexLockerEx ml(monitor(), |
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550 Mutex::_no_safepoint_check_flag); |
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551 _idle_inactive_task->set_should_wait(false); |
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552 monitor()->notify_all(); |
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553 // Release monitor |
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554 } |
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555 } |
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556 |
| 0 | 557 void GCTaskManager::print_task_time_stamps() { |
| 558 for(uint i=0; i<ParallelGCThreads; i++) { | |
| 559 GCTaskThread* t = thread(i); | |
| 560 t->print_task_time_stamps(); | |
| 561 } | |
| 562 } | |
| 563 | |
| 564 void GCTaskManager::print_threads_on(outputStream* st) { | |
| 565 uint num_thr = workers(); | |
| 566 for (uint i = 0; i < num_thr; i++) { | |
| 567 thread(i)->print_on(st); | |
| 568 st->cr(); | |
| 569 } | |
| 570 } | |
| 571 | |
| 572 void GCTaskManager::threads_do(ThreadClosure* tc) { | |
| 573 assert(tc != NULL, "Null ThreadClosure"); | |
| 574 uint num_thr = workers(); | |
| 575 for (uint i = 0; i < num_thr; i++) { | |
| 576 tc->do_thread(thread(i)); | |
| 577 } | |
| 578 } | |
| 579 | |
| 580 GCTaskThread* GCTaskManager::thread(uint which) { | |
| 581 assert(which < workers(), "index out of bounds"); | |
| 582 assert(_thread[which] != NULL, "shouldn't have null thread"); | |
| 583 return _thread[which]; | |
| 584 } | |
| 585 | |
| 586 void GCTaskManager::set_thread(uint which, GCTaskThread* value) { | |
| 587 assert(which < workers(), "index out of bounds"); | |
| 588 assert(value != NULL, "shouldn't have null thread"); | |
| 589 _thread[which] = value; | |
| 590 } | |
| 591 | |
| 592 void GCTaskManager::add_task(GCTask* task) { | |
| 593 assert(task != NULL, "shouldn't have null task"); | |
| 594 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 595 if (TraceGCTaskManager) { | |
| 596 tty->print_cr("GCTaskManager::add_task(" INTPTR_FORMAT " [%s])", | |
| 597 task, GCTask::Kind::to_string(task->kind())); | |
| 598 } | |
| 599 queue()->enqueue(task); | |
| 600 // Notify with the lock held to avoid missed notifies. | |
| 601 if (TraceGCTaskManager) { | |
| 602 tty->print_cr(" GCTaskManager::add_task (%s)->notify_all", | |
| 603 monitor()->name()); | |
| 604 } | |
| 605 (void) monitor()->notify_all(); | |
| 606 // Release monitor(). | |
| 607 } | |
| 608 | |
| 609 void GCTaskManager::add_list(GCTaskQueue* list) { | |
| 610 assert(list != NULL, "shouldn't have null task"); | |
| 611 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 612 if (TraceGCTaskManager) { | |
| 613 tty->print_cr("GCTaskManager::add_list(%u)", list->length()); | |
| 614 } | |
| 615 queue()->enqueue(list); | |
| 616 // Notify with the lock held to avoid missed notifies. | |
| 617 if (TraceGCTaskManager) { | |
| 618 tty->print_cr(" GCTaskManager::add_list (%s)->notify_all", | |
| 619 monitor()->name()); | |
| 620 } | |
| 621 (void) monitor()->notify_all(); | |
| 622 // Release monitor(). | |
| 623 } | |
| 624 | |
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625 // GC workers wait in get_task() for new work to be added |
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626 // to the GCTaskManager's queue. When new work is added, |
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627 // a notify is sent to the waiting GC workers which then |
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628 // compete to get tasks. If a GC worker wakes up and there |
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629 // is no work on the queue, it is given a noop_task to execute |
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630 // and then loops to find more work. |
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631 |
| 0 | 632 GCTask* GCTaskManager::get_task(uint which) { |
| 633 GCTask* result = NULL; | |
| 634 // Grab the queue lock. | |
| 635 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 636 // Wait while the queue is block or | |
| 637 // there is nothing to do, except maybe release resources. | |
| 638 while (is_blocked() || | |
| 639 (queue()->is_empty() && !should_release_resources(which))) { | |
| 640 if (TraceGCTaskManager) { | |
| 641 tty->print_cr("GCTaskManager::get_task(%u)" | |
| 642 " blocked: %s" | |
| 643 " empty: %s" | |
| 644 " release: %s", | |
| 645 which, | |
| 646 is_blocked() ? "true" : "false", | |
| 647 queue()->is_empty() ? "true" : "false", | |
| 648 should_release_resources(which) ? "true" : "false"); | |
| 649 tty->print_cr(" => (%s)->wait()", | |
| 650 monitor()->name()); | |
| 651 } | |
| 652 monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 653 } | |
| 654 // We've reacquired the queue lock here. | |
| 655 // Figure out which condition caused us to exit the loop above. | |
| 656 if (!queue()->is_empty()) { | |
| 657 if (UseGCTaskAffinity) { | |
| 658 result = queue()->dequeue(which); | |
| 659 } else { | |
| 660 result = queue()->dequeue(); | |
| 661 } | |
| 662 if (result->is_barrier_task()) { | |
| 663 assert(which != sentinel_worker(), | |
| 664 "blocker shouldn't be bogus"); | |
| 665 set_blocking_worker(which); | |
| 666 } | |
| 667 } else { | |
| 668 // The queue is empty, but we were woken up. | |
| 669 // Just hand back a Noop task, | |
| 670 // in case someone wanted us to release resources, or whatever. | |
| 671 result = noop_task(); | |
| 672 increment_noop_tasks(); | |
| 673 } | |
| 674 assert(result != NULL, "shouldn't have null task"); | |
| 675 if (TraceGCTaskManager) { | |
| 676 tty->print_cr("GCTaskManager::get_task(%u) => " INTPTR_FORMAT " [%s]", | |
| 677 which, result, GCTask::Kind::to_string(result->kind())); | |
| 678 tty->print_cr(" %s", result->name()); | |
| 679 } | |
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680 if (!result->is_idle_task()) { |
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681 increment_busy_workers(); |
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682 increment_delivered_tasks(); |
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683 } |
| 0 | 684 return result; |
| 685 // Release monitor(). | |
| 686 } | |
| 687 | |
| 688 void GCTaskManager::note_completion(uint which) { | |
| 689 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 690 if (TraceGCTaskManager) { | |
| 691 tty->print_cr("GCTaskManager::note_completion(%u)", which); | |
| 692 } | |
| 693 // If we are blocked, check if the completing thread is the blocker. | |
| 694 if (blocking_worker() == which) { | |
| 695 assert(blocking_worker() != sentinel_worker(), | |
| 696 "blocker shouldn't be bogus"); | |
| 697 increment_barriers(); | |
| 698 set_unblocked(); | |
| 699 } | |
| 700 increment_completed_tasks(); | |
| 701 uint active = decrement_busy_workers(); | |
| 702 if ((active == 0) && (queue()->is_empty())) { | |
| 703 increment_emptied_queue(); | |
| 704 if (TraceGCTaskManager) { | |
| 705 tty->print_cr(" GCTaskManager::note_completion(%u) done", which); | |
| 706 } | |
| 707 // Notify client that we are done. | |
| 708 NotifyDoneClosure* ndc = notify_done_closure(); | |
| 709 if (ndc != NULL) { | |
| 710 ndc->notify(this); | |
| 711 } | |
| 712 } | |
| 713 if (TraceGCTaskManager) { | |
| 714 tty->print_cr(" GCTaskManager::note_completion(%u) (%s)->notify_all", | |
| 715 which, monitor()->name()); | |
| 716 tty->print_cr(" " | |
| 717 " blocked: %s" | |
| 718 " empty: %s" | |
| 719 " release: %s", | |
| 720 is_blocked() ? "true" : "false", | |
| 721 queue()->is_empty() ? "true" : "false", | |
| 722 should_release_resources(which) ? "true" : "false"); | |
| 723 tty->print_cr(" " | |
| 724 " delivered: %u" | |
| 725 " completed: %u" | |
| 726 " barriers: %u" | |
| 727 " emptied: %u", | |
| 728 delivered_tasks(), | |
| 729 completed_tasks(), | |
| 730 barriers(), | |
| 731 emptied_queue()); | |
| 732 } | |
| 733 // Tell everyone that a task has completed. | |
| 734 (void) monitor()->notify_all(); | |
| 735 // Release monitor(). | |
| 736 } | |
| 737 | |
| 738 uint GCTaskManager::increment_busy_workers() { | |
| 739 assert(queue()->own_lock(), "don't own the lock"); | |
| 740 _busy_workers += 1; | |
| 741 return _busy_workers; | |
| 742 } | |
| 743 | |
| 744 uint GCTaskManager::decrement_busy_workers() { | |
| 745 assert(queue()->own_lock(), "don't own the lock"); | |
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746 assert(_busy_workers > 0, "About to make a mistake"); |
| 0 | 747 _busy_workers -= 1; |
| 748 return _busy_workers; | |
| 749 } | |
| 750 | |
| 751 void GCTaskManager::release_all_resources() { | |
| 752 // If you want this to be done atomically, do it in a BarrierGCTask. | |
| 753 for (uint i = 0; i < workers(); i += 1) { | |
| 754 set_resource_flag(i, true); | |
| 755 } | |
| 756 } | |
| 757 | |
| 758 bool GCTaskManager::should_release_resources(uint which) { | |
| 759 // This can be done without a lock because each thread reads one element. | |
| 760 return resource_flag(which); | |
| 761 } | |
| 762 | |
| 763 void GCTaskManager::note_release(uint which) { | |
| 764 // This can be done without a lock because each thread writes one element. | |
| 765 set_resource_flag(which, false); | |
| 766 } | |
| 767 | |
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768 // "list" contains tasks that are ready to execute. Those |
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769 // tasks are added to the GCTaskManager's queue of tasks and |
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770 // then the GC workers are notified that there is new work to |
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771 // do. |
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772 // |
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773 // Typically different types of tasks can be added to the "list". |
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774 // For example in PSScavenge OldToYoungRootsTask, SerialOldToYoungRootsTask, |
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775 // ScavengeRootsTask, and StealTask tasks are all added to the list |
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776 // and then the GC workers are notified of new work. The tasks are |
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777 // handed out in the order in which they are added to the list |
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778 // (although execution is not necessarily in that order). As long |
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779 // as any tasks are running the GCTaskManager will wait for execution |
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780 // to complete. GC workers that execute a stealing task remain in |
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781 // the stealing task until all stealing tasks have completed. The load |
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782 // balancing afforded by the stealing tasks work best if the stealing |
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783 // tasks are added last to the list. |
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784 |
| 0 | 785 void GCTaskManager::execute_and_wait(GCTaskQueue* list) { |
| 786 WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); | |
| 787 list->enqueue(fin); | |
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788 // The barrier task will be read by one of the GC |
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789 // workers once it is added to the list of tasks. |
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790 // Be sure that is globally visible before the |
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791 // GC worker reads it (which is after the task is added |
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792 // to the list of tasks below). |
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793 OrderAccess::storestore(); |
| 0 | 794 add_list(list); |
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795 fin->wait_for(true /* reset */); |
| 0 | 796 // We have to release the barrier tasks! |
| 797 WaitForBarrierGCTask::destroy(fin); | |
| 798 } | |
| 799 | |
| 800 bool GCTaskManager::resource_flag(uint which) { | |
| 801 assert(which < workers(), "index out of bounds"); | |
| 802 return _resource_flag[which]; | |
| 803 } | |
| 804 | |
| 805 void GCTaskManager::set_resource_flag(uint which, bool value) { | |
| 806 assert(which < workers(), "index out of bounds"); | |
| 807 _resource_flag[which] = value; | |
| 808 } | |
| 809 | |
| 810 // | |
| 811 // NoopGCTask | |
| 812 // | |
| 813 | |
| 814 NoopGCTask* NoopGCTask::create() { | |
| 815 NoopGCTask* result = new NoopGCTask(false); | |
| 816 return result; | |
| 817 } | |
| 818 | |
| 819 NoopGCTask* NoopGCTask::create_on_c_heap() { | |
| 6197 | 820 NoopGCTask* result = new(ResourceObj::C_HEAP, mtGC) NoopGCTask(true); |
| 0 | 821 return result; |
| 822 } | |
| 823 | |
| 824 void NoopGCTask::destroy(NoopGCTask* that) { | |
| 825 if (that != NULL) { | |
| 826 that->destruct(); | |
| 827 if (that->is_c_heap_obj()) { | |
| 828 FreeHeap(that); | |
| 829 } | |
| 830 } | |
| 831 } | |
| 832 | |
| 833 void NoopGCTask::destruct() { | |
| 834 // This has to know it's superclass structure, just like the constructor. | |
| 835 this->GCTask::destruct(); | |
| 836 // Nothing else to do. | |
| 837 } | |
| 838 | |
| 839 // | |
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840 // IdleGCTask |
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841 // |
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842 |
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843 IdleGCTask* IdleGCTask::create() { |
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844 IdleGCTask* result = new IdleGCTask(false); |
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845 assert(UseDynamicNumberOfGCThreads, |
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846 "Should only be used with dynamic GC thread"); |
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847 return result; |
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848 } |
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849 |
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850 IdleGCTask* IdleGCTask::create_on_c_heap() { |
| 6197 | 851 IdleGCTask* result = new(ResourceObj::C_HEAP, mtGC) IdleGCTask(true); |
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852 assert(UseDynamicNumberOfGCThreads, |
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853 "Should only be used with dynamic GC thread"); |
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854 return result; |
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855 } |
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856 |
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857 void IdleGCTask::do_it(GCTaskManager* manager, uint which) { |
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858 WaitForBarrierGCTask* wait_for_task = manager->idle_inactive_task(); |
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859 if (TraceGCTaskManager) { |
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860 tty->print_cr("[" INTPTR_FORMAT "]" |
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861 " IdleGCTask:::do_it()" |
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862 " should_wait: %s", |
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863 this, wait_for_task->should_wait() ? "true" : "false"); |
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864 } |
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865 MutexLockerEx ml(manager->monitor(), Mutex::_no_safepoint_check_flag); |
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866 if (TraceDynamicGCThreads) { |
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867 gclog_or_tty->print_cr("--- idle %d", which); |
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868 } |
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869 // Increment has to be done when the idle tasks are created. |
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870 // manager->increment_idle_workers(); |
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871 manager->monitor()->notify_all(); |
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872 while (wait_for_task->should_wait()) { |
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873 if (TraceGCTaskManager) { |
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874 tty->print_cr("[" INTPTR_FORMAT "]" |
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875 " IdleGCTask::do_it()" |
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876 " [" INTPTR_FORMAT "] (%s)->wait()", |
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877 this, manager->monitor(), manager->monitor()->name()); |
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878 } |
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879 manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
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880 } |
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881 manager->decrement_idle_workers(); |
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882 if (TraceDynamicGCThreads) { |
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883 gclog_or_tty->print_cr("--- release %d", which); |
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884 } |
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885 if (TraceGCTaskManager) { |
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886 tty->print_cr("[" INTPTR_FORMAT "]" |
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887 " IdleGCTask::do_it() returns" |
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888 " should_wait: %s", |
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889 this, wait_for_task->should_wait() ? "true" : "false"); |
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890 } |
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891 // Release monitor(). |
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892 } |
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893 |
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894 void IdleGCTask::destroy(IdleGCTask* that) { |
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895 if (that != NULL) { |
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896 that->destruct(); |
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897 if (that->is_c_heap_obj()) { |
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898 FreeHeap(that); |
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899 } |
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900 } |
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901 } |
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902 |
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903 void IdleGCTask::destruct() { |
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904 // This has to know it's superclass structure, just like the constructor. |
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905 this->GCTask::destruct(); |
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906 // Nothing else to do. |
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907 } |
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908 |
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909 // |
| 0 | 910 // BarrierGCTask |
| 911 // | |
| 912 | |
| 913 void BarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 914 // Wait for this to be the only busy worker. | |
| 915 // ??? I thought of having a StackObj class | |
| 916 // whose constructor would grab the lock and come to the barrier, | |
| 917 // and whose destructor would release the lock, | |
| 918 // but that seems like too much mechanism for two lines of code. | |
| 919 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 920 do_it_internal(manager, which); | |
| 921 // Release manager->lock(). | |
| 922 } | |
| 923 | |
| 924 void BarrierGCTask::do_it_internal(GCTaskManager* manager, uint which) { | |
| 925 // Wait for this to be the only busy worker. | |
| 926 assert(manager->monitor()->owned_by_self(), "don't own the lock"); | |
| 927 assert(manager->is_blocked(), "manager isn't blocked"); | |
| 928 while (manager->busy_workers() > 1) { | |
| 929 if (TraceGCTaskManager) { | |
| 930 tty->print_cr("BarrierGCTask::do_it(%u) waiting on %u workers", | |
| 931 which, manager->busy_workers()); | |
| 932 } | |
| 933 manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 934 } | |
| 935 } | |
| 936 | |
| 937 void BarrierGCTask::destruct() { | |
| 938 this->GCTask::destruct(); | |
| 939 // Nothing else to do. | |
| 940 } | |
| 941 | |
| 942 // | |
| 943 // ReleasingBarrierGCTask | |
| 944 // | |
| 945 | |
| 946 void ReleasingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 947 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 948 do_it_internal(manager, which); | |
| 949 manager->release_all_resources(); | |
| 950 // Release manager->lock(). | |
| 951 } | |
| 952 | |
| 953 void ReleasingBarrierGCTask::destruct() { | |
| 954 this->BarrierGCTask::destruct(); | |
| 955 // Nothing else to do. | |
| 956 } | |
| 957 | |
| 958 // | |
| 959 // NotifyingBarrierGCTask | |
| 960 // | |
| 961 | |
| 962 void NotifyingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 963 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 964 do_it_internal(manager, which); | |
| 965 NotifyDoneClosure* ndc = notify_done_closure(); | |
| 966 if (ndc != NULL) { | |
| 967 ndc->notify(manager); | |
| 968 } | |
| 969 // Release manager->lock(). | |
| 970 } | |
| 971 | |
| 972 void NotifyingBarrierGCTask::destruct() { | |
| 973 this->BarrierGCTask::destruct(); | |
| 974 // Nothing else to do. | |
| 975 } | |
| 976 | |
| 977 // | |
| 978 // WaitForBarrierGCTask | |
| 979 // | |
| 980 WaitForBarrierGCTask* WaitForBarrierGCTask::create() { | |
| 981 WaitForBarrierGCTask* result = new WaitForBarrierGCTask(false); | |
| 982 return result; | |
| 983 } | |
| 984 | |
| 985 WaitForBarrierGCTask* WaitForBarrierGCTask::create_on_c_heap() { | |
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986 WaitForBarrierGCTask* result = |
| 6197 | 987 new (ResourceObj::C_HEAP, mtGC) WaitForBarrierGCTask(true); |
| 0 | 988 return result; |
| 989 } | |
| 990 | |
| 991 WaitForBarrierGCTask::WaitForBarrierGCTask(bool on_c_heap) : | |
| 992 _is_c_heap_obj(on_c_heap) { | |
| 993 _monitor = MonitorSupply::reserve(); | |
| 994 set_should_wait(true); | |
| 995 if (TraceGCTaskManager) { | |
| 996 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 997 " WaitForBarrierGCTask::WaitForBarrierGCTask()" | |
| 998 " monitor: " INTPTR_FORMAT, | |
| 999 this, monitor()); | |
| 1000 } | |
| 1001 } | |
| 1002 | |
| 1003 void WaitForBarrierGCTask::destroy(WaitForBarrierGCTask* that) { | |
| 1004 if (that != NULL) { | |
| 1005 if (TraceGCTaskManager) { | |
| 1006 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1007 " WaitForBarrierGCTask::destroy()" | |
| 1008 " is_c_heap_obj: %s" | |
| 1009 " monitor: " INTPTR_FORMAT, | |
| 1010 that, | |
| 1011 that->is_c_heap_obj() ? "true" : "false", | |
| 1012 that->monitor()); | |
| 1013 } | |
| 1014 that->destruct(); | |
| 1015 if (that->is_c_heap_obj()) { | |
| 1016 FreeHeap(that); | |
| 1017 } | |
| 1018 } | |
| 1019 } | |
| 1020 | |
| 1021 void WaitForBarrierGCTask::destruct() { | |
| 1022 assert(monitor() != NULL, "monitor should not be NULL"); | |
| 1023 if (TraceGCTaskManager) { | |
| 1024 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1025 " WaitForBarrierGCTask::destruct()" | |
| 1026 " monitor: " INTPTR_FORMAT, | |
| 1027 this, monitor()); | |
| 1028 } | |
| 1029 this->BarrierGCTask::destruct(); | |
| 1030 // Clean up that should be in the destructor, | |
| 1031 // except that ResourceMarks don't call destructors. | |
| 1032 if (monitor() != NULL) { | |
| 1033 MonitorSupply::release(monitor()); | |
| 1034 } | |
| 1035 _monitor = (Monitor*) 0xDEAD000F; | |
| 1036 } | |
| 1037 | |
| 1038 void WaitForBarrierGCTask::do_it(GCTaskManager* manager, uint which) { | |
| 1039 if (TraceGCTaskManager) { | |
| 1040 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1041 " WaitForBarrierGCTask::do_it() waiting for idle" | |
| 1042 " monitor: " INTPTR_FORMAT, | |
| 1043 this, monitor()); | |
| 1044 } | |
| 1045 { | |
| 1046 // First, wait for the barrier to arrive. | |
| 1047 MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); | |
| 1048 do_it_internal(manager, which); | |
| 1049 // Release manager->lock(). | |
| 1050 } | |
| 1051 { | |
| 1052 // Then notify the waiter. | |
| 1053 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 1054 set_should_wait(false); | |
| 1055 // Waiter doesn't miss the notify in the wait_for method | |
| 1056 // since it checks the flag after grabbing the monitor. | |
| 1057 if (TraceGCTaskManager) { | |
| 1058 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1059 " WaitForBarrierGCTask::do_it()" | |
| 1060 " [" INTPTR_FORMAT "] (%s)->notify_all()", | |
| 1061 this, monitor(), monitor()->name()); | |
| 1062 } | |
| 1063 monitor()->notify_all(); | |
| 1064 // Release monitor(). | |
| 1065 } | |
| 1066 } | |
| 1067 | |
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1068 void WaitForBarrierGCTask::wait_for(bool reset) { |
| 0 | 1069 if (TraceGCTaskManager) { |
| 1070 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1071 " WaitForBarrierGCTask::wait_for()" | |
| 1072 " should_wait: %s", | |
| 1073 this, should_wait() ? "true" : "false"); | |
| 1074 } | |
| 1075 { | |
| 1076 // Grab the lock and check again. | |
| 1077 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
| 1078 while (should_wait()) { | |
| 1079 if (TraceGCTaskManager) { | |
| 1080 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1081 " WaitForBarrierGCTask::wait_for()" | |
| 1082 " [" INTPTR_FORMAT "] (%s)->wait()", | |
| 1083 this, monitor(), monitor()->name()); | |
| 1084 } | |
| 1085 monitor()->wait(Mutex::_no_safepoint_check_flag, 0); | |
| 1086 } | |
| 1087 // Reset the flag in case someone reuses this task. | |
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1088 if (reset) { |
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1089 set_should_wait(true); |
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1090 } |
| 0 | 1091 if (TraceGCTaskManager) { |
| 1092 tty->print_cr("[" INTPTR_FORMAT "]" | |
| 1093 " WaitForBarrierGCTask::wait_for() returns" | |
| 1094 " should_wait: %s", | |
| 1095 this, should_wait() ? "true" : "false"); | |
| 1096 } | |
| 1097 // Release monitor(). | |
| 1098 } | |
| 1099 } | |
| 1100 | |
| 1101 Mutex* MonitorSupply::_lock = NULL; | |
| 1102 GrowableArray<Monitor*>* MonitorSupply::_freelist = NULL; | |
| 1103 | |
| 1104 Monitor* MonitorSupply::reserve() { | |
| 1105 Monitor* result = NULL; | |
| 1106 // Lazy initialization: possible race. | |
| 1107 if (lock() == NULL) { | |
| 1108 _lock = new Mutex(Mutex::barrier, // rank | |
| 1109 "MonitorSupply mutex", // name | |
| 1110 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 1111 } | |
| 1112 { | |
| 1113 MutexLockerEx ml(lock()); | |
| 1114 // Lazy initialization. | |
| 1115 if (freelist() == NULL) { | |
| 1116 _freelist = | |
| 6197 | 1117 new(ResourceObj::C_HEAP, mtGC) GrowableArray<Monitor*>(ParallelGCThreads, |
| 0 | 1118 true); |
| 1119 } | |
| 1120 if (! freelist()->is_empty()) { | |
| 1121 result = freelist()->pop(); | |
| 1122 } else { | |
| 1123 result = new Monitor(Mutex::barrier, // rank | |
| 1124 "MonitorSupply monitor", // name | |
| 1125 Mutex::_allow_vm_block_flag); // allow_vm_block | |
| 1126 } | |
| 1127 guarantee(result != NULL, "shouldn't return NULL"); | |
| 1128 assert(!result->is_locked(), "shouldn't be locked"); | |
| 1129 // release lock(). | |
| 1130 } | |
| 1131 return result; | |
| 1132 } | |
| 1133 | |
| 1134 void MonitorSupply::release(Monitor* instance) { | |
| 1135 assert(instance != NULL, "shouldn't release NULL"); | |
| 1136 assert(!instance->is_locked(), "shouldn't be locked"); | |
| 1137 { | |
| 1138 MutexLockerEx ml(lock()); | |
| 1139 freelist()->push(instance); | |
| 1140 // release lock(). | |
| 1141 } | |
| 1142 } |