Mercurial > hg > truffle
annotate src/share/vm/utilities/workgroup.hpp @ 2426:1d1603768966
7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass
Summary: Update the copyright to be 2010 on all changed files in OpenJDK
Reviewed-by: ohair
| author | trims |
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| date | Tue, 05 Apr 2011 14:12:31 -0700 |
| parents | 92da084fefc9 |
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| 0 | 1 /* |
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2 * Copyright (c) 2002, 2011, 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 #ifndef SHARE_VM_UTILITIES_WORKGROUP_HPP |
| 26 #define SHARE_VM_UTILITIES_WORKGROUP_HPP | |
| 27 | |
| 28 #include "utilities/taskqueue.hpp" | |
| 29 #ifdef TARGET_OS_FAMILY_linux | |
| 30 # include "thread_linux.inline.hpp" | |
| 31 #endif | |
| 32 #ifdef TARGET_OS_FAMILY_solaris | |
| 33 # include "thread_solaris.inline.hpp" | |
| 34 #endif | |
| 35 #ifdef TARGET_OS_FAMILY_windows | |
| 36 # include "thread_windows.inline.hpp" | |
| 37 #endif | |
| 38 | |
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39 // Task class hierarchy: |
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40 // AbstractGangTask |
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41 // AbstractGangTaskWOopQueues |
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42 // |
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43 // Gang/Group class hierarchy: |
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44 // AbstractWorkGang |
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45 // WorkGang |
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46 // FlexibleWorkGang |
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47 // YieldingFlexibleWorkGang (defined in another file) |
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48 // |
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49 // Worker class hierarchy: |
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50 // GangWorker (subclass of WorkerThread) |
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51 // YieldingFlexibleGangWorker (defined in another file) |
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52 |
| 0 | 53 // Forward declarations of classes defined here |
| 54 | |
| 55 class WorkGang; | |
| 56 class GangWorker; | |
| 57 class YieldingFlexibleGangWorker; | |
| 58 class YieldingFlexibleGangTask; | |
| 59 class WorkData; | |
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60 class AbstractWorkGang; |
| 0 | 61 |
| 62 // An abstract task to be worked on by a gang. | |
| 63 // You subclass this to supply your own work() method | |
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64 class AbstractGangTask VALUE_OBJ_CLASS_SPEC { |
| 0 | 65 public: |
| 66 // The abstract work method. | |
| 67 // The argument tells you which member of the gang you are. | |
| 68 virtual void work(int i) = 0; | |
| 69 | |
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70 // This method configures the task for proper termination. |
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71 // Some tasks do not have any requirements on termination |
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72 // and may inherit this method that does nothing. Some |
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73 // tasks do some coordination on termination and override |
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74 // this method to implement that coordination. |
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75 virtual void set_for_termination(int active_workers) {}; |
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76 |
| 0 | 77 // Debugging accessor for the name. |
| 78 const char* name() const PRODUCT_RETURN_(return NULL;); | |
| 79 int counter() { return _counter; } | |
| 80 void set_counter(int value) { _counter = value; } | |
| 81 int *address_of_counter() { return &_counter; } | |
| 82 | |
| 83 // RTTI | |
| 84 NOT_PRODUCT(virtual bool is_YieldingFlexibleGang_task() const { | |
| 85 return false; | |
| 86 }) | |
| 87 | |
| 88 private: | |
| 89 NOT_PRODUCT(const char* _name;) | |
| 90 // ??? Should a task have a priority associated with it? | |
| 91 // ??? Or can the run method adjust priority as needed? | |
| 92 int _counter; | |
| 93 | |
| 94 protected: | |
| 95 // Constructor and desctructor: only construct subclasses. | |
| 96 AbstractGangTask(const char* name) { | |
| 97 NOT_PRODUCT(_name = name); | |
| 98 _counter = 0; | |
| 99 } | |
| 100 virtual ~AbstractGangTask() { } | |
| 101 }; | |
| 102 | |
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103 class AbstractGangTaskWOopQueues : public AbstractGangTask { |
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104 OopTaskQueueSet* _queues; |
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105 ParallelTaskTerminator _terminator; |
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106 public: |
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107 AbstractGangTaskWOopQueues(const char* name, OopTaskQueueSet* queues) : |
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108 AbstractGangTask(name), _queues(queues), _terminator(0, _queues) {} |
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109 ParallelTaskTerminator* terminator() { return &_terminator; } |
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110 virtual void set_for_termination(int active_workers) { |
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111 terminator()->reset_for_reuse(active_workers); |
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112 } |
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113 OopTaskQueueSet* queues() { return _queues; } |
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114 }; |
| 0 | 115 |
| 116 // Class AbstractWorkGang: | |
| 117 // An abstract class representing a gang of workers. | |
| 118 // You subclass this to supply an implementation of run_task(). | |
| 119 class AbstractWorkGang: public CHeapObj { | |
| 120 // Here's the public interface to this class. | |
| 121 public: | |
| 122 // Constructor and destructor. | |
| 342 | 123 AbstractWorkGang(const char* name, bool are_GC_task_threads, |
| 124 bool are_ConcurrentGC_threads); | |
| 0 | 125 ~AbstractWorkGang(); |
| 126 // Run a task, returns when the task is done (or terminated). | |
| 127 virtual void run_task(AbstractGangTask* task) = 0; | |
| 128 // Stop and terminate all workers. | |
| 129 virtual void stop(); | |
| 130 public: | |
| 131 // Debugging. | |
| 132 const char* name() const; | |
| 133 protected: | |
| 134 // Initialize only instance data. | |
| 342 | 135 const bool _are_GC_task_threads; |
| 136 const bool _are_ConcurrentGC_threads; | |
| 0 | 137 // Printing support. |
| 138 const char* _name; | |
| 139 // The monitor which protects these data, | |
| 140 // and notifies of changes in it. | |
| 141 Monitor* _monitor; | |
| 142 // The count of the number of workers in the gang. | |
| 143 int _total_workers; | |
| 144 // Whether the workers should terminate. | |
| 145 bool _terminate; | |
| 146 // The array of worker threads for this gang. | |
| 147 // This is only needed for cleaning up. | |
| 148 GangWorker** _gang_workers; | |
| 149 // The task for this gang. | |
| 150 AbstractGangTask* _task; | |
| 151 // A sequence number for the current task. | |
| 152 int _sequence_number; | |
| 153 // The number of started workers. | |
| 154 int _started_workers; | |
| 155 // The number of finished workers. | |
| 156 int _finished_workers; | |
| 157 public: | |
| 158 // Accessors for fields | |
| 159 Monitor* monitor() const { | |
| 160 return _monitor; | |
| 161 } | |
| 162 int total_workers() const { | |
| 163 return _total_workers; | |
| 164 } | |
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165 virtual int active_workers() const { |
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166 return _total_workers; |
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167 } |
| 0 | 168 bool terminate() const { |
| 169 return _terminate; | |
| 170 } | |
| 171 GangWorker** gang_workers() const { | |
| 172 return _gang_workers; | |
| 173 } | |
| 174 AbstractGangTask* task() const { | |
| 175 return _task; | |
| 176 } | |
| 177 int sequence_number() const { | |
| 178 return _sequence_number; | |
| 179 } | |
| 180 int started_workers() const { | |
| 181 return _started_workers; | |
| 182 } | |
| 183 int finished_workers() const { | |
| 184 return _finished_workers; | |
| 185 } | |
| 342 | 186 bool are_GC_task_threads() const { |
| 187 return _are_GC_task_threads; | |
| 188 } | |
| 189 bool are_ConcurrentGC_threads() const { | |
| 190 return _are_ConcurrentGC_threads; | |
| 0 | 191 } |
| 192 // Predicates. | |
| 193 bool is_idle() const { | |
| 194 return (task() == NULL); | |
| 195 } | |
| 196 // Return the Ith gang worker. | |
| 197 GangWorker* gang_worker(int i) const; | |
| 198 | |
| 199 void threads_do(ThreadClosure* tc) const; | |
| 200 | |
| 201 // Printing | |
| 202 void print_worker_threads_on(outputStream *st) const; | |
| 203 void print_worker_threads() const { | |
| 204 print_worker_threads_on(tty); | |
| 205 } | |
| 206 | |
| 207 protected: | |
| 208 friend class GangWorker; | |
| 209 friend class YieldingFlexibleGangWorker; | |
| 210 // Note activation and deactivation of workers. | |
| 211 // These methods should only be called with the mutex held. | |
| 212 void internal_worker_poll(WorkData* data) const; | |
| 213 void internal_note_start(); | |
| 214 void internal_note_finish(); | |
| 215 }; | |
| 216 | |
| 217 class WorkData: public StackObj { | |
| 218 // This would be a struct, but I want accessor methods. | |
| 219 private: | |
| 220 bool _terminate; | |
| 221 AbstractGangTask* _task; | |
| 222 int _sequence_number; | |
| 223 public: | |
| 224 // Constructor and destructor | |
| 225 WorkData() { | |
| 226 _terminate = false; | |
| 227 _task = NULL; | |
| 228 _sequence_number = 0; | |
| 229 } | |
| 230 ~WorkData() { | |
| 231 } | |
| 232 // Accessors and modifiers | |
| 233 bool terminate() const { return _terminate; } | |
| 234 void set_terminate(bool value) { _terminate = value; } | |
| 235 AbstractGangTask* task() const { return _task; } | |
| 236 void set_task(AbstractGangTask* value) { _task = value; } | |
| 237 int sequence_number() const { return _sequence_number; } | |
| 238 void set_sequence_number(int value) { _sequence_number = value; } | |
| 239 | |
| 240 YieldingFlexibleGangTask* yf_task() const { | |
| 241 return (YieldingFlexibleGangTask*)_task; | |
| 242 } | |
| 243 }; | |
| 244 | |
| 245 // Class WorkGang: | |
| 246 class WorkGang: public AbstractWorkGang { | |
| 247 public: | |
| 248 // Constructor | |
| 342 | 249 WorkGang(const char* name, int workers, |
| 250 bool are_GC_task_threads, bool are_ConcurrentGC_threads); | |
| 0 | 251 // Run a task, returns when the task is done (or terminated). |
| 252 virtual void run_task(AbstractGangTask* task); | |
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253 void run_task(AbstractGangTask* task, uint no_of_parallel_workers); |
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254 // Allocate a worker and return a pointer to it. |
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255 virtual GangWorker* allocate_worker(int which); |
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256 // Initialize workers in the gang. Return true if initialization |
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257 // succeeded. The type of the worker can be overridden in a derived |
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258 // class with the appropriate implementation of allocate_worker(). |
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259 bool initialize_workers(); |
| 0 | 260 }; |
| 261 | |
| 262 // Class GangWorker: | |
| 263 // Several instances of this class run in parallel as workers for a gang. | |
| 264 class GangWorker: public WorkerThread { | |
| 265 public: | |
| 266 // Constructors and destructor. | |
| 267 GangWorker(AbstractWorkGang* gang, uint id); | |
| 268 | |
| 269 // The only real method: run a task for the gang. | |
| 270 virtual void run(); | |
| 271 // Predicate for Thread | |
| 272 virtual bool is_GC_task_thread() const; | |
| 342 | 273 virtual bool is_ConcurrentGC_thread() const; |
| 0 | 274 // Printing |
| 275 void print_on(outputStream* st) const; | |
| 276 virtual void print() const { print_on(tty); } | |
| 277 protected: | |
| 278 AbstractWorkGang* _gang; | |
| 279 | |
| 280 virtual void initialize(); | |
| 281 virtual void loop(); | |
| 282 | |
| 283 public: | |
| 284 AbstractWorkGang* gang() const { return _gang; } | |
| 285 }; | |
| 286 | |
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287 class FlexibleWorkGang: public WorkGang { |
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288 protected: |
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289 int _active_workers; |
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290 public: |
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291 // Constructor and destructor. |
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292 FlexibleWorkGang(const char* name, int workers, |
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293 bool are_GC_task_threads, |
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294 bool are_ConcurrentGC_threads) : |
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295 WorkGang(name, workers, are_GC_task_threads, are_ConcurrentGC_threads) { |
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296 _active_workers = ParallelGCThreads; |
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297 }; |
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298 // Accessors for fields |
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299 virtual int active_workers() const { return _active_workers; } |
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300 void set_active_workers(int v) { _active_workers = v; } |
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301 }; |
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302 |
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303 // Work gangs in garbage collectors: 2009-06-10 |
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304 // |
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305 // SharedHeap - work gang for stop-the-world parallel collection. |
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306 // Used by |
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307 // ParNewGeneration |
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308 // CMSParRemarkTask |
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309 // CMSRefProcTaskExecutor |
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310 // G1CollectedHeap |
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311 // G1ParFinalCountTask |
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312 // ConcurrentMark |
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313 // CMSCollector |
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314 |
| 0 | 315 // A class that acts as a synchronisation barrier. Workers enter |
| 316 // the barrier and must wait until all other workers have entered | |
| 317 // before any of them may leave. | |
| 318 | |
| 319 class WorkGangBarrierSync : public StackObj { | |
| 320 protected: | |
| 321 Monitor _monitor; | |
| 322 int _n_workers; | |
| 323 int _n_completed; | |
| 342 | 324 bool _should_reset; |
| 0 | 325 |
| 342 | 326 Monitor* monitor() { return &_monitor; } |
| 327 int n_workers() { return _n_workers; } | |
| 328 int n_completed() { return _n_completed; } | |
| 329 bool should_reset() { return _should_reset; } | |
| 0 | 330 |
| 342 | 331 void zero_completed() { _n_completed = 0; } |
| 332 void inc_completed() { _n_completed++; } | |
| 333 | |
| 334 void set_should_reset(bool v) { _should_reset = v; } | |
| 0 | 335 |
| 336 public: | |
| 337 WorkGangBarrierSync(); | |
| 338 WorkGangBarrierSync(int n_workers, const char* name); | |
| 339 | |
| 340 // Set the number of workers that will use the barrier. | |
| 341 // Must be called before any of the workers start running. | |
| 342 void set_n_workers(int n_workers); | |
| 343 | |
| 344 // Enter the barrier. A worker that enters the barrier will | |
| 345 // not be allowed to leave until all other threads have | |
| 346 // also entered the barrier. | |
| 347 void enter(); | |
| 348 }; | |
| 349 | |
| 350 // A class to manage claiming of subtasks within a group of tasks. The | |
| 351 // subtasks will be identified by integer indices, usually elements of an | |
| 352 // enumeration type. | |
| 353 | |
| 354 class SubTasksDone: public CHeapObj { | |
| 355 jint* _tasks; | |
| 356 int _n_tasks; | |
| 357 int _n_threads; | |
| 358 jint _threads_completed; | |
| 359 #ifdef ASSERT | |
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360 volatile jint _claimed; |
| 0 | 361 #endif |
| 362 | |
| 363 // Set all tasks to unclaimed. | |
| 364 void clear(); | |
| 365 | |
| 366 public: | |
| 367 // Initializes "this" to a state in which there are "n" tasks to be | |
| 368 // processed, none of the which are originally claimed. The number of | |
| 369 // threads doing the tasks is initialized 1. | |
| 370 SubTasksDone(int n); | |
| 371 | |
| 372 // True iff the object is in a valid state. | |
| 373 bool valid(); | |
| 374 | |
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375 // Get/set the number of parallel threads doing the tasks to "t". Can only |
| 0 | 376 // be called before tasks start or after they are complete. |
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377 int n_threads() { return _n_threads; } |
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378 void set_n_threads(int t); |
| 0 | 379 |
| 380 // Returns "false" if the task "t" is unclaimed, and ensures that task is | |
| 381 // claimed. The task "t" is required to be within the range of "this". | |
| 382 bool is_task_claimed(int t); | |
| 383 | |
| 384 // The calling thread asserts that it has attempted to claim all the | |
| 385 // tasks that it will try to claim. Every thread in the parallel task | |
| 386 // must execute this. (When the last thread does so, the task array is | |
| 387 // cleared.) | |
| 388 void all_tasks_completed(); | |
| 389 | |
| 390 // Destructor. | |
| 391 ~SubTasksDone(); | |
| 392 }; | |
| 393 | |
| 394 // As above, but for sequential tasks, i.e. instead of claiming | |
| 395 // sub-tasks from a set (possibly an enumeration), claim sub-tasks | |
| 396 // in sequential order. This is ideal for claiming dynamically | |
| 397 // partitioned tasks (like striding in the parallel remembered | |
| 398 // set scanning). Note that unlike the above class this is | |
| 399 // a stack object - is there any reason for it not to be? | |
| 400 | |
| 401 class SequentialSubTasksDone : public StackObj { | |
| 402 protected: | |
| 403 jint _n_tasks; // Total number of tasks available. | |
| 404 jint _n_claimed; // Number of tasks claimed. | |
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405 // _n_threads is used to determine when a sub task is done. |
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406 // See comments on SubTasksDone::_n_threads |
| 0 | 407 jint _n_threads; // Total number of parallel threads. |
| 408 jint _n_completed; // Number of completed threads. | |
| 409 | |
| 410 void clear(); | |
| 411 | |
| 412 public: | |
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413 SequentialSubTasksDone() { |
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414 clear(); |
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415 } |
| 0 | 416 ~SequentialSubTasksDone() {} |
| 417 | |
| 418 // True iff the object is in a valid state. | |
| 419 bool valid(); | |
| 420 | |
| 421 // number of tasks | |
| 422 jint n_tasks() const { return _n_tasks; } | |
| 423 | |
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424 // Get/set the number of parallel threads doing the tasks to t. |
| 0 | 425 // Should be called before the task starts but it is safe |
| 426 // to call this once a task is running provided that all | |
| 427 // threads agree on the number of threads. | |
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428 int n_threads() { return _n_threads; } |
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429 void set_n_threads(int t) { _n_threads = t; } |
| 0 | 430 |
| 431 // Set the number of tasks to be claimed to t. As above, | |
| 432 // should be called before the tasks start but it is safe | |
| 433 // to call this once a task is running provided all threads | |
| 434 // agree on the number of tasks. | |
| 435 void set_n_tasks(int t) { _n_tasks = t; } | |
| 436 | |
| 437 // Returns false if the next task in the sequence is unclaimed, | |
| 438 // and ensures that it is claimed. Will set t to be the index | |
| 439 // of the claimed task in the sequence. Will return true if | |
| 440 // the task cannot be claimed and there are none left to claim. | |
| 441 bool is_task_claimed(int& t); | |
| 442 | |
| 443 // The calling thread asserts that it has attempted to claim | |
| 444 // all the tasks it possibly can in the sequence. Every thread | |
| 445 // claiming tasks must promise call this. Returns true if this | |
| 446 // is the last thread to complete so that the thread can perform | |
| 447 // cleanup if necessary. | |
| 448 bool all_tasks_completed(); | |
| 449 }; | |
| 342 | 450 |
| 451 // Represents a set of free small integer ids. | |
| 452 class FreeIdSet { | |
| 453 enum { | |
| 454 end_of_list = -1, | |
| 455 claimed = -2 | |
| 456 }; | |
| 457 | |
| 458 int _sz; | |
| 459 Monitor* _mon; | |
| 460 | |
| 461 int* _ids; | |
| 462 int _hd; | |
| 463 int _waiters; | |
| 464 int _claimed; | |
| 465 | |
| 466 static bool _safepoint; | |
| 467 typedef FreeIdSet* FreeIdSetPtr; | |
| 468 static const int NSets = 10; | |
| 469 static FreeIdSetPtr _sets[NSets]; | |
| 470 static bool _stat_init; | |
| 471 int _index; | |
| 472 | |
| 473 public: | |
| 474 FreeIdSet(int sz, Monitor* mon); | |
| 475 ~FreeIdSet(); | |
| 476 | |
| 477 static void set_safepoint(bool b); | |
| 478 | |
| 479 // Attempt to claim the given id permanently. Returns "true" iff | |
| 480 // successful. | |
| 481 bool claim_perm_id(int i); | |
| 482 | |
| 483 // Returns an unclaimed parallel id (waiting for one to be released if | |
| 484 // necessary). Returns "-1" if a GC wakes up a wait for an id. | |
| 485 int claim_par_id(); | |
| 486 | |
| 487 void release_par_id(int id); | |
| 488 }; | |
| 1972 | 489 |
| 490 #endif // SHARE_VM_UTILITIES_WORKGROUP_HPP |