Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/workgroup.hpp @ 3960:f08d439fab8c
7089790: integrate bsd-port changes
Reviewed-by: kvn, twisti, jrose
Contributed-by: Kurt Miller <kurt@intricatesoftware.com>, Greg Lewis <glewis@eyesbeyond.com>, Jung-uk Kim <jkim@freebsd.org>, Christos Zoulas <christos@zoulas.com>, Landon Fuller <landonf@plausible.coop>, The FreeBSD Foundation <board@freebsdfoundation.org>, Michael Franz <mvfranz@gmail.com>, Roger Hoover <rhoover@apple.com>, Alexander Strange <astrange@apple.com>
| author | never |
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| date | Sun, 25 Sep 2011 16:03:29 -0700 |
| parents | 92da084fefc9 |
| children | bca17e38de00 |
| rev | line source |
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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 | |
| 3960 | 38 #ifdef TARGET_OS_FAMILY_bsd |
| 39 # include "thread_bsd.inline.hpp" | |
| 40 #endif | |
| 1972 | 41 |
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42 // Task class hierarchy: |
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43 // AbstractGangTask |
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44 // AbstractGangTaskWOopQueues |
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45 // |
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46 // Gang/Group class hierarchy: |
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47 // AbstractWorkGang |
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48 // WorkGang |
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49 // FlexibleWorkGang |
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50 // YieldingFlexibleWorkGang (defined in another file) |
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51 // |
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52 // Worker class hierarchy: |
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53 // GangWorker (subclass of WorkerThread) |
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54 // YieldingFlexibleGangWorker (defined in another file) |
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55 |
| 0 | 56 // Forward declarations of classes defined here |
| 57 | |
| 58 class WorkGang; | |
| 59 class GangWorker; | |
| 60 class YieldingFlexibleGangWorker; | |
| 61 class YieldingFlexibleGangTask; | |
| 62 class WorkData; | |
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63 class AbstractWorkGang; |
| 0 | 64 |
| 65 // An abstract task to be worked on by a gang. | |
| 66 // You subclass this to supply your own work() method | |
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67 class AbstractGangTask VALUE_OBJ_CLASS_SPEC { |
| 0 | 68 public: |
| 69 // The abstract work method. | |
| 70 // The argument tells you which member of the gang you are. | |
| 71 virtual void work(int i) = 0; | |
| 72 | |
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73 // This method configures the task for proper termination. |
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74 // Some tasks do not have any requirements on termination |
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75 // and may inherit this method that does nothing. Some |
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76 // tasks do some coordination on termination and override |
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77 // this method to implement that coordination. |
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78 virtual void set_for_termination(int active_workers) {}; |
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79 |
| 0 | 80 // Debugging accessor for the name. |
| 81 const char* name() const PRODUCT_RETURN_(return NULL;); | |
| 82 int counter() { return _counter; } | |
| 83 void set_counter(int value) { _counter = value; } | |
| 84 int *address_of_counter() { return &_counter; } | |
| 85 | |
| 86 // RTTI | |
| 87 NOT_PRODUCT(virtual bool is_YieldingFlexibleGang_task() const { | |
| 88 return false; | |
| 89 }) | |
| 90 | |
| 91 private: | |
| 92 NOT_PRODUCT(const char* _name;) | |
| 93 // ??? Should a task have a priority associated with it? | |
| 94 // ??? Or can the run method adjust priority as needed? | |
| 95 int _counter; | |
| 96 | |
| 97 protected: | |
| 98 // Constructor and desctructor: only construct subclasses. | |
| 99 AbstractGangTask(const char* name) { | |
| 100 NOT_PRODUCT(_name = name); | |
| 101 _counter = 0; | |
| 102 } | |
| 103 virtual ~AbstractGangTask() { } | |
| 104 }; | |
| 105 | |
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106 class AbstractGangTaskWOopQueues : public AbstractGangTask { |
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107 OopTaskQueueSet* _queues; |
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108 ParallelTaskTerminator _terminator; |
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109 public: |
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110 AbstractGangTaskWOopQueues(const char* name, OopTaskQueueSet* queues) : |
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111 AbstractGangTask(name), _queues(queues), _terminator(0, _queues) {} |
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112 ParallelTaskTerminator* terminator() { return &_terminator; } |
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113 virtual void set_for_termination(int active_workers) { |
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114 terminator()->reset_for_reuse(active_workers); |
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115 } |
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116 OopTaskQueueSet* queues() { return _queues; } |
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117 }; |
| 0 | 118 |
| 119 // Class AbstractWorkGang: | |
| 120 // An abstract class representing a gang of workers. | |
| 121 // You subclass this to supply an implementation of run_task(). | |
| 122 class AbstractWorkGang: public CHeapObj { | |
| 123 // Here's the public interface to this class. | |
| 124 public: | |
| 125 // Constructor and destructor. | |
| 342 | 126 AbstractWorkGang(const char* name, bool are_GC_task_threads, |
| 127 bool are_ConcurrentGC_threads); | |
| 0 | 128 ~AbstractWorkGang(); |
| 129 // Run a task, returns when the task is done (or terminated). | |
| 130 virtual void run_task(AbstractGangTask* task) = 0; | |
| 131 // Stop and terminate all workers. | |
| 132 virtual void stop(); | |
| 133 public: | |
| 134 // Debugging. | |
| 135 const char* name() const; | |
| 136 protected: | |
| 137 // Initialize only instance data. | |
| 342 | 138 const bool _are_GC_task_threads; |
| 139 const bool _are_ConcurrentGC_threads; | |
| 0 | 140 // Printing support. |
| 141 const char* _name; | |
| 142 // The monitor which protects these data, | |
| 143 // and notifies of changes in it. | |
| 144 Monitor* _monitor; | |
| 145 // The count of the number of workers in the gang. | |
| 146 int _total_workers; | |
| 147 // Whether the workers should terminate. | |
| 148 bool _terminate; | |
| 149 // The array of worker threads for this gang. | |
| 150 // This is only needed for cleaning up. | |
| 151 GangWorker** _gang_workers; | |
| 152 // The task for this gang. | |
| 153 AbstractGangTask* _task; | |
| 154 // A sequence number for the current task. | |
| 155 int _sequence_number; | |
| 156 // The number of started workers. | |
| 157 int _started_workers; | |
| 158 // The number of finished workers. | |
| 159 int _finished_workers; | |
| 160 public: | |
| 161 // Accessors for fields | |
| 162 Monitor* monitor() const { | |
| 163 return _monitor; | |
| 164 } | |
| 165 int total_workers() const { | |
| 166 return _total_workers; | |
| 167 } | |
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168 virtual int active_workers() const { |
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169 return _total_workers; |
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170 } |
| 0 | 171 bool terminate() const { |
| 172 return _terminate; | |
| 173 } | |
| 174 GangWorker** gang_workers() const { | |
| 175 return _gang_workers; | |
| 176 } | |
| 177 AbstractGangTask* task() const { | |
| 178 return _task; | |
| 179 } | |
| 180 int sequence_number() const { | |
| 181 return _sequence_number; | |
| 182 } | |
| 183 int started_workers() const { | |
| 184 return _started_workers; | |
| 185 } | |
| 186 int finished_workers() const { | |
| 187 return _finished_workers; | |
| 188 } | |
| 342 | 189 bool are_GC_task_threads() const { |
| 190 return _are_GC_task_threads; | |
| 191 } | |
| 192 bool are_ConcurrentGC_threads() const { | |
| 193 return _are_ConcurrentGC_threads; | |
| 0 | 194 } |
| 195 // Predicates. | |
| 196 bool is_idle() const { | |
| 197 return (task() == NULL); | |
| 198 } | |
| 199 // Return the Ith gang worker. | |
| 200 GangWorker* gang_worker(int i) const; | |
| 201 | |
| 202 void threads_do(ThreadClosure* tc) const; | |
| 203 | |
| 204 // Printing | |
| 205 void print_worker_threads_on(outputStream *st) const; | |
| 206 void print_worker_threads() const { | |
| 207 print_worker_threads_on(tty); | |
| 208 } | |
| 209 | |
| 210 protected: | |
| 211 friend class GangWorker; | |
| 212 friend class YieldingFlexibleGangWorker; | |
| 213 // Note activation and deactivation of workers. | |
| 214 // These methods should only be called with the mutex held. | |
| 215 void internal_worker_poll(WorkData* data) const; | |
| 216 void internal_note_start(); | |
| 217 void internal_note_finish(); | |
| 218 }; | |
| 219 | |
| 220 class WorkData: public StackObj { | |
| 221 // This would be a struct, but I want accessor methods. | |
| 222 private: | |
| 223 bool _terminate; | |
| 224 AbstractGangTask* _task; | |
| 225 int _sequence_number; | |
| 226 public: | |
| 227 // Constructor and destructor | |
| 228 WorkData() { | |
| 229 _terminate = false; | |
| 230 _task = NULL; | |
| 231 _sequence_number = 0; | |
| 232 } | |
| 233 ~WorkData() { | |
| 234 } | |
| 235 // Accessors and modifiers | |
| 236 bool terminate() const { return _terminate; } | |
| 237 void set_terminate(bool value) { _terminate = value; } | |
| 238 AbstractGangTask* task() const { return _task; } | |
| 239 void set_task(AbstractGangTask* value) { _task = value; } | |
| 240 int sequence_number() const { return _sequence_number; } | |
| 241 void set_sequence_number(int value) { _sequence_number = value; } | |
| 242 | |
| 243 YieldingFlexibleGangTask* yf_task() const { | |
| 244 return (YieldingFlexibleGangTask*)_task; | |
| 245 } | |
| 246 }; | |
| 247 | |
| 248 // Class WorkGang: | |
| 249 class WorkGang: public AbstractWorkGang { | |
| 250 public: | |
| 251 // Constructor | |
| 342 | 252 WorkGang(const char* name, int workers, |
| 253 bool are_GC_task_threads, bool are_ConcurrentGC_threads); | |
| 0 | 254 // Run a task, returns when the task is done (or terminated). |
| 255 virtual void run_task(AbstractGangTask* task); | |
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256 void run_task(AbstractGangTask* task, uint no_of_parallel_workers); |
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257 // Allocate a worker and return a pointer to it. |
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258 virtual GangWorker* allocate_worker(int which); |
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259 // Initialize workers in the gang. Return true if initialization |
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260 // succeeded. The type of the worker can be overridden in a derived |
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261 // class with the appropriate implementation of allocate_worker(). |
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262 bool initialize_workers(); |
| 0 | 263 }; |
| 264 | |
| 265 // Class GangWorker: | |
| 266 // Several instances of this class run in parallel as workers for a gang. | |
| 267 class GangWorker: public WorkerThread { | |
| 268 public: | |
| 269 // Constructors and destructor. | |
| 270 GangWorker(AbstractWorkGang* gang, uint id); | |
| 271 | |
| 272 // The only real method: run a task for the gang. | |
| 273 virtual void run(); | |
| 274 // Predicate for Thread | |
| 275 virtual bool is_GC_task_thread() const; | |
| 342 | 276 virtual bool is_ConcurrentGC_thread() const; |
| 0 | 277 // Printing |
| 278 void print_on(outputStream* st) const; | |
| 279 virtual void print() const { print_on(tty); } | |
| 280 protected: | |
| 281 AbstractWorkGang* _gang; | |
| 282 | |
| 283 virtual void initialize(); | |
| 284 virtual void loop(); | |
| 285 | |
| 286 public: | |
| 287 AbstractWorkGang* gang() const { return _gang; } | |
| 288 }; | |
| 289 | |
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290 class FlexibleWorkGang: public WorkGang { |
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291 protected: |
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292 int _active_workers; |
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293 public: |
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294 // Constructor and destructor. |
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295 FlexibleWorkGang(const char* name, int workers, |
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296 bool are_GC_task_threads, |
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297 bool are_ConcurrentGC_threads) : |
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298 WorkGang(name, workers, are_GC_task_threads, are_ConcurrentGC_threads) { |
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299 _active_workers = ParallelGCThreads; |
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300 }; |
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301 // Accessors for fields |
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302 virtual int active_workers() const { return _active_workers; } |
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303 void set_active_workers(int v) { _active_workers = v; } |
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304 }; |
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305 |
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306 // Work gangs in garbage collectors: 2009-06-10 |
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307 // |
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308 // SharedHeap - work gang for stop-the-world parallel collection. |
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309 // Used by |
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310 // ParNewGeneration |
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311 // CMSParRemarkTask |
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312 // CMSRefProcTaskExecutor |
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313 // G1CollectedHeap |
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314 // G1ParFinalCountTask |
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315 // ConcurrentMark |
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316 // CMSCollector |
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317 |
| 0 | 318 // A class that acts as a synchronisation barrier. Workers enter |
| 319 // the barrier and must wait until all other workers have entered | |
| 320 // before any of them may leave. | |
| 321 | |
| 322 class WorkGangBarrierSync : public StackObj { | |
| 323 protected: | |
| 324 Monitor _monitor; | |
| 325 int _n_workers; | |
| 326 int _n_completed; | |
| 342 | 327 bool _should_reset; |
| 0 | 328 |
| 342 | 329 Monitor* monitor() { return &_monitor; } |
| 330 int n_workers() { return _n_workers; } | |
| 331 int n_completed() { return _n_completed; } | |
| 332 bool should_reset() { return _should_reset; } | |
| 0 | 333 |
| 342 | 334 void zero_completed() { _n_completed = 0; } |
| 335 void inc_completed() { _n_completed++; } | |
| 336 | |
| 337 void set_should_reset(bool v) { _should_reset = v; } | |
| 0 | 338 |
| 339 public: | |
| 340 WorkGangBarrierSync(); | |
| 341 WorkGangBarrierSync(int n_workers, const char* name); | |
| 342 | |
| 343 // Set the number of workers that will use the barrier. | |
| 344 // Must be called before any of the workers start running. | |
| 345 void set_n_workers(int n_workers); | |
| 346 | |
| 347 // Enter the barrier. A worker that enters the barrier will | |
| 348 // not be allowed to leave until all other threads have | |
| 349 // also entered the barrier. | |
| 350 void enter(); | |
| 351 }; | |
| 352 | |
| 353 // A class to manage claiming of subtasks within a group of tasks. The | |
| 354 // subtasks will be identified by integer indices, usually elements of an | |
| 355 // enumeration type. | |
| 356 | |
| 357 class SubTasksDone: public CHeapObj { | |
| 358 jint* _tasks; | |
| 359 int _n_tasks; | |
| 360 int _n_threads; | |
| 361 jint _threads_completed; | |
| 362 #ifdef ASSERT | |
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363 volatile jint _claimed; |
| 0 | 364 #endif |
| 365 | |
| 366 // Set all tasks to unclaimed. | |
| 367 void clear(); | |
| 368 | |
| 369 public: | |
| 370 // Initializes "this" to a state in which there are "n" tasks to be | |
| 371 // processed, none of the which are originally claimed. The number of | |
| 372 // threads doing the tasks is initialized 1. | |
| 373 SubTasksDone(int n); | |
| 374 | |
| 375 // True iff the object is in a valid state. | |
| 376 bool valid(); | |
| 377 | |
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378 // Get/set the number of parallel threads doing the tasks to "t". Can only |
| 0 | 379 // be called before tasks start or after they are complete. |
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380 int n_threads() { return _n_threads; } |
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381 void set_n_threads(int t); |
| 0 | 382 |
| 383 // Returns "false" if the task "t" is unclaimed, and ensures that task is | |
| 384 // claimed. The task "t" is required to be within the range of "this". | |
| 385 bool is_task_claimed(int t); | |
| 386 | |
| 387 // The calling thread asserts that it has attempted to claim all the | |
| 388 // tasks that it will try to claim. Every thread in the parallel task | |
| 389 // must execute this. (When the last thread does so, the task array is | |
| 390 // cleared.) | |
| 391 void all_tasks_completed(); | |
| 392 | |
| 393 // Destructor. | |
| 394 ~SubTasksDone(); | |
| 395 }; | |
| 396 | |
| 397 // As above, but for sequential tasks, i.e. instead of claiming | |
| 398 // sub-tasks from a set (possibly an enumeration), claim sub-tasks | |
| 399 // in sequential order. This is ideal for claiming dynamically | |
| 400 // partitioned tasks (like striding in the parallel remembered | |
| 401 // set scanning). Note that unlike the above class this is | |
| 402 // a stack object - is there any reason for it not to be? | |
| 403 | |
| 404 class SequentialSubTasksDone : public StackObj { | |
| 405 protected: | |
| 406 jint _n_tasks; // Total number of tasks available. | |
| 407 jint _n_claimed; // Number of tasks claimed. | |
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408 // _n_threads is used to determine when a sub task is done. |
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409 // See comments on SubTasksDone::_n_threads |
| 0 | 410 jint _n_threads; // Total number of parallel threads. |
| 411 jint _n_completed; // Number of completed threads. | |
| 412 | |
| 413 void clear(); | |
| 414 | |
| 415 public: | |
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416 SequentialSubTasksDone() { |
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417 clear(); |
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418 } |
| 0 | 419 ~SequentialSubTasksDone() {} |
| 420 | |
| 421 // True iff the object is in a valid state. | |
| 422 bool valid(); | |
| 423 | |
| 424 // number of tasks | |
| 425 jint n_tasks() const { return _n_tasks; } | |
| 426 | |
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427 // Get/set the number of parallel threads doing the tasks to t. |
| 0 | 428 // Should be called before the task starts but it is safe |
| 429 // to call this once a task is running provided that all | |
| 430 // threads agree on the number of threads. | |
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431 int n_threads() { return _n_threads; } |
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432 void set_n_threads(int t) { _n_threads = t; } |
| 0 | 433 |
| 434 // Set the number of tasks to be claimed to t. As above, | |
| 435 // should be called before the tasks start but it is safe | |
| 436 // to call this once a task is running provided all threads | |
| 437 // agree on the number of tasks. | |
| 438 void set_n_tasks(int t) { _n_tasks = t; } | |
| 439 | |
| 440 // Returns false if the next task in the sequence is unclaimed, | |
| 441 // and ensures that it is claimed. Will set t to be the index | |
| 442 // of the claimed task in the sequence. Will return true if | |
| 443 // the task cannot be claimed and there are none left to claim. | |
| 444 bool is_task_claimed(int& t); | |
| 445 | |
| 446 // The calling thread asserts that it has attempted to claim | |
| 447 // all the tasks it possibly can in the sequence. Every thread | |
| 448 // claiming tasks must promise call this. Returns true if this | |
| 449 // is the last thread to complete so that the thread can perform | |
| 450 // cleanup if necessary. | |
| 451 bool all_tasks_completed(); | |
| 452 }; | |
| 342 | 453 |
| 454 // Represents a set of free small integer ids. | |
| 455 class FreeIdSet { | |
| 456 enum { | |
| 457 end_of_list = -1, | |
| 458 claimed = -2 | |
| 459 }; | |
| 460 | |
| 461 int _sz; | |
| 462 Monitor* _mon; | |
| 463 | |
| 464 int* _ids; | |
| 465 int _hd; | |
| 466 int _waiters; | |
| 467 int _claimed; | |
| 468 | |
| 469 static bool _safepoint; | |
| 470 typedef FreeIdSet* FreeIdSetPtr; | |
| 471 static const int NSets = 10; | |
| 472 static FreeIdSetPtr _sets[NSets]; | |
| 473 static bool _stat_init; | |
| 474 int _index; | |
| 475 | |
| 476 public: | |
| 477 FreeIdSet(int sz, Monitor* mon); | |
| 478 ~FreeIdSet(); | |
| 479 | |
| 480 static void set_safepoint(bool b); | |
| 481 | |
| 482 // Attempt to claim the given id permanently. Returns "true" iff | |
| 483 // successful. | |
| 484 bool claim_perm_id(int i); | |
| 485 | |
| 486 // Returns an unclaimed parallel id (waiting for one to be released if | |
| 487 // necessary). Returns "-1" if a GC wakes up a wait for an id. | |
| 488 int claim_par_id(); | |
| 489 | |
| 490 void release_par_id(int id); | |
| 491 }; | |
| 1972 | 492 |
| 493 #endif // SHARE_VM_UTILITIES_WORKGROUP_HPP |