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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "cc/worker_pool.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/debug/trace_event.h" | |
| 9 #include "base/stringprintf.h" | |
| 10 #include "base/synchronization/condition_variable.h" | |
| 11 #include "base/threading/simple_thread.h" | |
| 12 #include "cc/rendering_stats.h" | |
| 13 | |
| 14 #if defined(OS_ANDROID) | |
| 15 // TODO(epenner): Move thread priorities to base. (crbug.com/170549) | |
| 16 #include <sys/resource.h> | |
| 17 #endif | |
| 18 | |
| 19 namespace cc { | |
| 20 | |
| 21 namespace { | |
| 22 | |
| 23 class WorkerPoolTaskImpl : public internal::WorkerPoolTask { | |
| 24 public: | |
| 25 WorkerPoolTaskImpl(const WorkerPool::Callback& task, | |
| 26 const base::Closure& reply) | |
| 27 : internal::WorkerPoolTask(reply), | |
| 28 task_(task) {} | |
| 29 | |
| 30 virtual bool IsCheap() OVERRIDE { return false; } | |
| 31 | |
| 32 virtual void Run(RenderingStats* rendering_stats) OVERRIDE { | |
| 33 task_.Run(rendering_stats); | |
| 34 } | |
| 35 | |
| 36 virtual void RunOnThread( | |
| 37 RenderingStats* rendering_stats, unsigned thread_index) OVERRIDE { | |
| 38 task_.Run(rendering_stats); | |
| 39 } | |
| 40 | |
| 41 private: | |
| 42 WorkerPool::Callback task_; | |
| 43 }; | |
| 44 | |
| 45 } // namespace | |
| 46 | |
| 47 namespace internal { | |
| 48 | |
| 49 WorkerPoolTask::WorkerPoolTask(const base::Closure& reply) : reply_(reply) { | |
| 50 } | |
| 51 | |
| 52 WorkerPoolTask::~WorkerPoolTask() { | |
| 53 } | |
| 54 | |
| 55 void WorkerPoolTask::DidComplete() { | |
| 56 reply_.Run(); | |
| 57 } | |
| 58 | |
| 59 } // namespace internal | |
| 60 | |
| 61 // Internal to the worker pool. Any data or logic that needs to be | |
| 62 // shared between threads lives in this class. All members are guarded | |
| 63 // by |lock_|. | |
| 64 class WorkerPool::Inner : public base::DelegateSimpleThread::Delegate { | |
| 65 public: | |
| 66 Inner(WorkerPool* worker_pool, | |
| 67 size_t num_threads, | |
| 68 const std::string& thread_name_prefix, | |
| 69 bool need_on_task_completed_callback); | |
| 70 ~Inner(); | |
| 71 | |
| 72 void Shutdown(); | |
| 73 | |
| 74 void SetRecordRenderingStats(bool record_rendering_stats); | |
| 75 | |
| 76 void GetRenderingStats(RenderingStats* stats); | |
| 77 | |
| 78 void PostTask(scoped_ptr<internal::WorkerPoolTask> task); | |
| 79 | |
| 80 // Appends all completed tasks to worker pool's completed tasks queue | |
| 81 // and returns true if idle. | |
| 82 bool CollectCompletedTasks(); | |
| 83 | |
| 84 // Runs cheap tasks on caller thread until |time_limit| is reached | |
| 85 // and returns true if idle. | |
| 86 bool RunCheapTasksUntilTimeLimit(base::TimeTicks time_limit); | |
| 87 | |
| 88 private: | |
| 89 // Appends all completed tasks to |completed_tasks|. Lock must | |
| 90 // already be acquired before calling this function. | |
| 91 bool AppendCompletedTasksWithLockAcquired( | |
| 92 ScopedPtrDeque<internal::WorkerPoolTask>* completed_tasks); | |
| 93 | |
| 94 // Schedule a OnTaskCompletedOnOriginThread callback if not already | |
| 95 // pending. Lock must already be acquired before calling this function. | |
| 96 void ScheduleOnTaskCompletedWithLockAcquired(); | |
| 97 void OnTaskCompletedOnOriginThread(); | |
| 98 | |
| 99 // Schedule an OnIdleOnOriginThread callback if not already pending. | |
| 100 // Lock must already be acquired before calling this function. | |
| 101 void ScheduleOnIdleWithLockAcquired(); | |
| 102 void OnIdleOnOriginThread(); | |
| 103 | |
| 104 // Overridden from base::DelegateSimpleThread: | |
| 105 virtual void Run() OVERRIDE; | |
| 106 | |
| 107 // Pointer to worker pool. Can only be used on origin thread. | |
| 108 // Not guarded by |lock_|. | |
| 109 WorkerPool* worker_pool_on_origin_thread_; | |
| 110 | |
| 111 // This lock protects all members of this class except | |
| 112 // |worker_pool_on_origin_thread_|. Do not read or modify anything | |
| 113 // without holding this lock. Do not block while holding this lock. | |
| 114 mutable base::Lock lock_; | |
| 115 | |
| 116 // Condition variable that is waited on by worker threads until new | |
| 117 // tasks are posted or shutdown starts. | |
| 118 base::ConditionVariable has_pending_tasks_cv_; | |
| 119 | |
| 120 // Target message loop used for posting callbacks. | |
| 121 scoped_refptr<base::MessageLoopProxy> origin_loop_; | |
| 122 | |
| 123 base::WeakPtrFactory<Inner> weak_ptr_factory_; | |
| 124 | |
| 125 // Set to true when worker pool requires a callback for each | |
| 126 // completed task. | |
| 127 bool need_on_task_completed_callback_; | |
| 128 | |
| 129 const base::Closure on_task_completed_callback_; | |
| 130 // Set when a OnTaskCompletedOnOriginThread() callback is pending. | |
| 131 bool on_task_completed_pending_; | |
| 132 | |
| 133 const base::Closure on_idle_callback_; | |
| 134 // Set when a OnIdleOnOriginThread() callback is pending. | |
| 135 bool on_idle_pending_; | |
| 136 | |
| 137 // Provides each running thread loop with a unique index. First thread | |
| 138 // loop index is 0. | |
| 139 unsigned next_thread_index_; | |
| 140 | |
| 141 // Number of tasks currently running. | |
| 142 unsigned running_task_count_; | |
| 143 | |
| 144 // Set during shutdown. Tells workers to exit when no more tasks | |
| 145 // are pending. | |
| 146 bool shutdown_; | |
| 147 | |
| 148 typedef ScopedPtrDeque<internal::WorkerPoolTask> TaskDeque; | |
| 149 TaskDeque pending_tasks_; | |
| 150 TaskDeque completed_tasks_; | |
| 151 | |
| 152 scoped_ptr<RenderingStats> rendering_stats_; | |
| 153 | |
| 154 ScopedPtrDeque<base::DelegateSimpleThread> workers_; | |
| 155 | |
| 156 DISALLOW_COPY_AND_ASSIGN(Inner); | |
| 157 }; | |
| 158 | |
| 159 WorkerPool::Inner::Inner(WorkerPool* worker_pool, | |
| 160 size_t num_threads, | |
| 161 const std::string& thread_name_prefix, | |
| 162 bool need_on_task_completed_callback) | |
| 163 : worker_pool_on_origin_thread_(worker_pool), | |
| 164 lock_(), | |
| 165 has_pending_tasks_cv_(&lock_), | |
| 166 origin_loop_(base::MessageLoopProxy::current()), | |
| 167 weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)), | |
| 168 need_on_task_completed_callback_(need_on_task_completed_callback), | |
| 169 on_task_completed_callback_( | |
| 170 base::Bind(&WorkerPool::Inner::OnTaskCompletedOnOriginThread, | |
| 171 weak_ptr_factory_.GetWeakPtr())), | |
| 172 on_task_completed_pending_(false), | |
| 173 on_idle_callback_(base::Bind(&WorkerPool::Inner::OnIdleOnOriginThread, | |
| 174 weak_ptr_factory_.GetWeakPtr())), | |
| 175 on_idle_pending_(false), | |
| 176 next_thread_index_(0), | |
| 177 running_task_count_(0), | |
| 178 shutdown_(false) { | |
| 179 base::AutoLock lock(lock_); | |
| 180 | |
| 181 while (workers_.size() < num_threads) { | |
| 182 scoped_ptr<base::DelegateSimpleThread> worker = make_scoped_ptr( | |
| 183 new base::DelegateSimpleThread( | |
| 184 this, | |
| 185 thread_name_prefix + | |
| 186 StringPrintf("Worker%lu", workers_.size() + 1).c_str())); | |
| 187 worker->Start(); | |
| 188 workers_.push_back(worker.Pass()); | |
| 189 } | |
| 190 } | |
| 191 | |
| 192 WorkerPool::Inner::~Inner() { | |
| 193 base::AutoLock lock(lock_); | |
| 194 | |
| 195 DCHECK(shutdown_); | |
| 196 | |
| 197 // Cancel all pending callbacks. | |
| 198 weak_ptr_factory_.InvalidateWeakPtrs(); | |
| 199 | |
| 200 DCHECK_EQ(pending_tasks_.size(), 0); | |
| 201 DCHECK_EQ(completed_tasks_.size(), 0); | |
| 202 DCHECK_EQ(running_task_count_, 0); | |
| 203 } | |
| 204 | |
| 205 void WorkerPool::Inner::Shutdown() { | |
| 206 { | |
| 207 base::AutoLock lock(lock_); | |
| 208 | |
| 209 DCHECK(!shutdown_); | |
| 210 shutdown_ = true; | |
| 211 | |
| 212 // Wake up a worker so it knows it should exit. This will cause all workers | |
| 213 // to exit as each will wake up another worker before exiting. | |
| 214 has_pending_tasks_cv_.Signal(); | |
| 215 } | |
| 216 | |
| 217 while (workers_.size()) { | |
| 218 scoped_ptr<base::DelegateSimpleThread> worker = workers_.take_front(); | |
| 219 worker->Join(); | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 void WorkerPool::Inner::SetRecordRenderingStats(bool record_rendering_stats) { | |
| 224 base::AutoLock lock(lock_); | |
| 225 | |
| 226 if (record_rendering_stats) | |
| 227 rendering_stats_.reset(new RenderingStats); | |
| 228 else | |
| 229 rendering_stats_.reset(); | |
| 230 } | |
| 231 | |
| 232 void WorkerPool::Inner::GetRenderingStats(RenderingStats* stats) { | |
| 233 base::AutoLock lock(lock_); | |
| 234 | |
| 235 if (rendering_stats_) | |
| 236 stats->Add(*rendering_stats_); | |
| 237 } | |
| 238 | |
| 239 void WorkerPool::Inner::PostTask(scoped_ptr<internal::WorkerPoolTask> task) { | |
| 240 base::AutoLock lock(lock_); | |
| 241 | |
| 242 pending_tasks_.push_back(task.Pass()); | |
| 243 | |
| 244 // There is more work available, so wake up worker thread. | |
| 245 has_pending_tasks_cv_.Signal(); | |
| 246 } | |
| 247 | |
| 248 bool WorkerPool::Inner::CollectCompletedTasks() { | |
| 249 base::AutoLock lock(lock_); | |
| 250 | |
| 251 return AppendCompletedTasksWithLockAcquired( | |
| 252 &worker_pool_on_origin_thread_->completed_tasks_); | |
| 253 } | |
| 254 | |
| 255 bool WorkerPool::Inner::RunCheapTasksUntilTimeLimit( | |
| 256 base::TimeTicks time_limit) { | |
| 257 base::AutoLock lock(lock_); | |
| 258 | |
| 259 while (base::TimeTicks::Now() < time_limit) { | |
| 260 scoped_ptr<internal::WorkerPoolTask> task; | |
| 261 | |
| 262 // Find next cheap task. | |
| 263 for (TaskDeque::iterator iter = pending_tasks_.begin(); | |
| 264 iter != pending_tasks_.end(); ++iter) { | |
| 265 if ((*iter)->IsCheap()) { | |
| 266 task = pending_tasks_.take(iter); | |
| 267 break; | |
| 268 } | |
| 269 } | |
| 270 | |
| 271 if (!task) { | |
| 272 // Schedule an idle callback if requested and not pending. | |
| 273 if (!running_task_count_ && pending_tasks_.empty()) | |
| 274 ScheduleOnIdleWithLockAcquired(); | |
| 275 | |
| 276 // Exit when no more cheap tasks are pending. | |
| 277 break; | |
| 278 } | |
| 279 | |
| 280 scoped_ptr<RenderingStats> rendering_stats; | |
| 281 // Collect rendering stats if |rendering_stats_| is set. | |
| 282 if (rendering_stats_) | |
| 283 rendering_stats = make_scoped_ptr(new RenderingStats); | |
| 284 | |
| 285 // Increment |running_task_count_| before starting to run task. | |
| 286 running_task_count_++; | |
| 287 | |
| 288 { | |
| 289 base::AutoUnlock unlock(lock_); | |
| 290 | |
| 291 task->Run(rendering_stats.get()); | |
| 292 | |
| 293 // Append tasks directly to worker pool's completed tasks queue. | |
| 294 worker_pool_on_origin_thread_->completed_tasks_.push_back(task.Pass()); | |
| 295 if (need_on_task_completed_callback_) | |
| 296 worker_pool_on_origin_thread_->OnTaskCompleted(); | |
| 297 } | |
| 298 | |
| 299 // Add rendering stat results to |rendering_stats_|. | |
| 300 if (rendering_stats && rendering_stats_) | |
| 301 rendering_stats_->Add(*rendering_stats); | |
| 302 | |
| 303 // Decrement |running_task_count_| now that we are done running task. | |
| 304 running_task_count_--; | |
| 305 } | |
| 306 | |
| 307 // Append any other completed tasks before releasing lock. | |
| 308 return AppendCompletedTasksWithLockAcquired( | |
| 309 &worker_pool_on_origin_thread_->completed_tasks_); | |
| 310 } | |
| 311 | |
| 312 bool WorkerPool::Inner::AppendCompletedTasksWithLockAcquired( | |
| 313 ScopedPtrDeque<internal::WorkerPoolTask>* completed_tasks) { | |
| 314 lock_.AssertAcquired(); | |
| 315 | |
| 316 while (completed_tasks_.size()) | |
| 317 completed_tasks->push_back(completed_tasks_.take_front().Pass()); | |
| 318 | |
| 319 return !running_task_count_ && pending_tasks_.empty(); | |
| 320 } | |
| 321 | |
| 322 void WorkerPool::Inner::ScheduleOnTaskCompletedWithLockAcquired() { | |
| 323 lock_.AssertAcquired(); | |
| 324 | |
| 325 if (on_task_completed_pending_ || !need_on_task_completed_callback_) | |
| 326 return; | |
| 327 origin_loop_->PostTask(FROM_HERE, on_task_completed_callback_); | |
| 328 on_task_completed_pending_ = true; | |
| 329 } | |
| 330 | |
| 331 void WorkerPool::Inner::OnTaskCompletedOnOriginThread() { | |
| 332 { | |
| 333 base::AutoLock lock(lock_); | |
| 334 | |
| 335 DCHECK(on_task_completed_pending_); | |
| 336 on_task_completed_pending_ = false; | |
| 337 | |
| 338 AppendCompletedTasksWithLockAcquired( | |
| 339 &worker_pool_on_origin_thread_->completed_tasks_); | |
| 340 } | |
| 341 | |
| 342 worker_pool_on_origin_thread_->OnTaskCompleted(); | |
| 343 } | |
| 344 | |
| 345 void WorkerPool::Inner::ScheduleOnIdleWithLockAcquired() { | |
| 346 lock_.AssertAcquired(); | |
| 347 | |
| 348 if (on_idle_pending_) | |
| 349 return; | |
| 350 origin_loop_->PostTask(FROM_HERE, on_idle_callback_); | |
| 351 on_idle_pending_ = true; | |
| 352 } | |
| 353 | |
| 354 void WorkerPool::Inner::OnIdleOnOriginThread() { | |
| 355 { | |
| 356 base::AutoLock lock(lock_); | |
| 357 | |
| 358 DCHECK(on_idle_pending_); | |
| 359 on_idle_pending_ = false; | |
| 360 | |
| 361 // Early out if no longer idle. | |
| 362 if (running_task_count_ || !pending_tasks_.empty()) | |
| 363 return; | |
| 364 | |
| 365 AppendCompletedTasksWithLockAcquired( | |
| 366 &worker_pool_on_origin_thread_->completed_tasks_); | |
| 367 } | |
| 368 | |
| 369 worker_pool_on_origin_thread_->OnIdle(); | |
| 370 } | |
| 371 | |
| 372 void WorkerPool::Inner::Run() { | |
| 373 #if defined(OS_ANDROID) | |
| 374 // TODO(epenner): Move thread priorities to base. (crbug.com/170549) | |
| 375 int nice_value = 10; // Idle priority. | |
| 376 setpriority(PRIO_PROCESS, base::PlatformThread::CurrentId(), nice_value); | |
| 377 #endif | |
| 378 | |
| 379 { | |
| 380 base::AutoLock lock(lock_); | |
| 381 | |
| 382 // Get a unique thread index. | |
| 383 int thread_index = next_thread_index_++; | |
| 384 | |
| 385 while (true) { | |
| 386 if (pending_tasks_.empty()) { | |
| 387 // Exit when shutdown is set and no more tasks are pending. | |
| 388 if (shutdown_) | |
| 389 break; | |
| 390 | |
| 391 // Schedule an idle callback if requested and not pending. | |
| 392 if (!running_task_count_) | |
| 393 ScheduleOnIdleWithLockAcquired(); | |
| 394 | |
| 395 // Wait for new pending tasks. | |
| 396 has_pending_tasks_cv_.Wait(); | |
| 397 continue; | |
| 398 } | |
| 399 | |
| 400 // Get next task. | |
| 401 scoped_ptr<internal::WorkerPoolTask> task = pending_tasks_.take_front(); | |
| 402 | |
| 403 scoped_ptr<RenderingStats> rendering_stats; | |
| 404 // Collect rendering stats if |rendering_stats_| is set. | |
| 405 if (rendering_stats_) | |
| 406 rendering_stats = make_scoped_ptr(new RenderingStats); | |
| 407 | |
| 408 // Increment |running_task_count_| before starting to run task. | |
| 409 running_task_count_++; | |
| 410 | |
| 411 // There may be more work available, so wake up another | |
| 412 // worker thread. | |
| 413 has_pending_tasks_cv_.Signal(); | |
| 414 | |
| 415 { | |
| 416 base::AutoUnlock unlock(lock_); | |
| 417 | |
| 418 task->RunOnThread(rendering_stats.get(), thread_index); | |
| 419 } | |
| 420 | |
| 421 completed_tasks_.push_back(task.Pass()); | |
| 422 | |
| 423 // Add rendering stat results to |rendering_stats_|. | |
| 424 if (rendering_stats && rendering_stats_) | |
| 425 rendering_stats_->Add(*rendering_stats); | |
| 426 | |
| 427 // Decrement |running_task_count_| now that we are done running task. | |
| 428 running_task_count_--; | |
| 429 | |
| 430 // Schedule a task completed callback if requested and not pending. | |
| 431 ScheduleOnTaskCompletedWithLockAcquired(); | |
| 432 } | |
| 433 | |
| 434 // We noticed we should exit. Wake up the next worker so it knows it should | |
| 435 // exit as well (because the Shutdown() code only signals once). | |
| 436 has_pending_tasks_cv_.Signal(); | |
| 437 } | |
| 438 } | |
| 439 | |
| 440 WorkerPool::WorkerPool(WorkerPoolClient* client, | |
| 441 size_t num_threads, | |
| 442 base::TimeDelta check_for_completed_tasks_delay, | |
| 443 const std::string& thread_name_prefix) | |
| 444 : client_(client), | |
| 445 origin_loop_(base::MessageLoopProxy::current()), | |
| 446 weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)), | |
| 447 check_for_completed_tasks_delay_(check_for_completed_tasks_delay), | |
| 448 check_for_completed_tasks_pending_(false), | |
| 449 run_cheap_tasks_callback_( | |
| 450 base::Bind(&WorkerPool::RunCheapTasks, | |
| 451 weak_ptr_factory_.GetWeakPtr())), | |
| 452 run_cheap_tasks_pending_(false), | |
| 453 inner_(make_scoped_ptr( | |
| 454 new Inner( | |
| 455 this, | |
| 456 num_threads, | |
| 457 thread_name_prefix, | |
| 458 // Request OnTaskCompleted() callback when check | |
| 459 // for completed tasks delay is 0. | |
| 460 check_for_completed_tasks_delay == base::TimeDelta()))) { | |
| 461 } | |
| 462 | |
| 463 WorkerPool::~WorkerPool() { | |
| 464 Shutdown(); | |
| 465 | |
| 466 // Cancel all pending callbacks. | |
| 467 weak_ptr_factory_.InvalidateWeakPtrs(); | |
| 468 | |
| 469 DCHECK_EQ(completed_tasks_.size(), 0); | |
| 470 } | |
| 471 | |
| 472 void WorkerPool::Shutdown() { | |
| 473 inner_->Shutdown(); | |
| 474 DispatchCompletionCallbacks(); | |
| 475 } | |
| 476 | |
| 477 void WorkerPool::PostTaskAndReply( | |
| 478 const Callback& task, const base::Closure& reply) { | |
| 479 PostTask(make_scoped_ptr(new WorkerPoolTaskImpl( | |
| 480 task, | |
| 481 reply)).PassAs<internal::WorkerPoolTask>()); | |
| 482 } | |
| 483 | |
| 484 void WorkerPool::SetRunCheapTasksTimeLimit( | |
| 485 base::TimeTicks run_cheap_tasks_time_limit) { | |
| 486 run_cheap_tasks_time_limit_ = run_cheap_tasks_time_limit; | |
| 487 ScheduleRunCheapTasks(); | |
| 488 } | |
| 489 | |
| 490 void WorkerPool::SetRecordRenderingStats(bool record_rendering_stats) { | |
| 491 inner_->SetRecordRenderingStats(record_rendering_stats); | |
| 492 } | |
| 493 | |
| 494 void WorkerPool::GetRenderingStats(RenderingStats* stats) { | |
| 495 inner_->GetRenderingStats(stats); | |
| 496 } | |
| 497 | |
| 498 void WorkerPool::OnIdle() { | |
| 499 TRACE_EVENT0("cc", "WorkerPool::OnIdle"); | |
| 500 | |
| 501 DispatchCompletionCallbacks(); | |
| 502 } | |
| 503 | |
| 504 void WorkerPool::OnTaskCompleted() { | |
| 505 TRACE_EVENT0("cc", "WorkerPool::OnTaskCompleted"); | |
| 506 | |
| 507 DispatchCompletionCallbacks(); | |
| 508 } | |
| 509 | |
| 510 void WorkerPool::ScheduleCheckForCompletedTasks() { | |
| 511 if (check_for_completed_tasks_pending_ || | |
| 512 check_for_completed_tasks_delay_ == base::TimeDelta()) | |
| 513 return; | |
| 514 check_for_completed_tasks_callback_.Reset( | |
| 515 base::Bind(&WorkerPool::CheckForCompletedTasks, | |
| 516 weak_ptr_factory_.GetWeakPtr())); | |
| 517 check_for_completed_tasks_time_ = base::TimeTicks::Now() + | |
| 518 check_for_completed_tasks_delay_; | |
| 519 origin_loop_->PostDelayedTask( | |
| 520 FROM_HERE, | |
| 521 check_for_completed_tasks_callback_.callback(), | |
| 522 check_for_completed_tasks_delay_); | |
| 523 check_for_completed_tasks_pending_ = true; | |
| 524 } | |
| 525 | |
| 526 void WorkerPool::CheckForCompletedTasks() { | |
| 527 TRACE_EVENT0("cc", "WorkerPool::CheckForCompletedTasks"); | |
| 528 DCHECK(check_for_completed_tasks_pending_); | |
| 529 check_for_completed_tasks_pending_ = false; | |
| 530 | |
| 531 // Schedule another check for completed tasks if not idle. | |
| 532 if (!inner_->CollectCompletedTasks()) | |
| 533 ScheduleCheckForCompletedTasks(); | |
| 534 | |
| 535 DispatchCompletionCallbacks(); | |
| 536 } | |
| 537 | |
| 538 void WorkerPool::CancelCheckForCompletedTasks() { | |
| 539 if (!check_for_completed_tasks_pending_) | |
| 540 return; | |
| 541 | |
| 542 check_for_completed_tasks_callback_.Cancel(); | |
| 543 check_for_completed_tasks_pending_ = false; | |
| 544 } | |
| 545 | |
| 546 void WorkerPool::DispatchCompletionCallbacks() { | |
| 547 TRACE_EVENT0("cc", "WorkerPool::DispatchCompletionCallbacks"); | |
| 548 | |
| 549 if (completed_tasks_.empty()) | |
| 550 return; | |
| 551 | |
| 552 while (completed_tasks_.size()) { | |
| 553 scoped_ptr<internal::WorkerPoolTask> task = completed_tasks_.take_front(); | |
| 554 task->DidComplete(); | |
| 555 } | |
| 556 | |
| 557 client_->DidFinishDispatchingWorkerPoolCompletionCallbacks(); | |
| 558 } | |
| 559 | |
| 560 void WorkerPool::PostTask(scoped_ptr<internal::WorkerPoolTask> task) { | |
| 561 if (task->IsCheap()) | |
| 562 ScheduleRunCheapTasks(); | |
| 563 | |
| 564 // Schedule check for completed tasks if not pending. | |
| 565 ScheduleCheckForCompletedTasks(); | |
| 566 | |
| 567 inner_->PostTask(task.Pass()); | |
| 568 } | |
| 569 | |
| 570 void WorkerPool::ScheduleRunCheapTasks() { | |
| 571 if (run_cheap_tasks_pending_) | |
| 572 return; | |
| 573 origin_loop_->PostTask(FROM_HERE, run_cheap_tasks_callback_); | |
| 574 run_cheap_tasks_pending_ = true; | |
| 575 } | |
| 576 | |
| 577 void WorkerPool::RunCheapTasks() { | |
| 578 TRACE_EVENT0("cc", "WorkerPool::RunCheapTasks"); | |
| 579 DCHECK(run_cheap_tasks_pending_); | |
| 580 run_cheap_tasks_pending_ = false; | |
| 581 | |
| 582 while (true) { | |
| 583 base::TimeTicks time_limit = run_cheap_tasks_time_limit_; | |
| 584 | |
| 585 if (!check_for_completed_tasks_time_.is_null()) | |
| 586 time_limit = std::min(time_limit, check_for_completed_tasks_time_); | |
| 587 | |
| 588 bool is_idle = inner_->RunCheapTasksUntilTimeLimit(time_limit); | |
| 589 | |
| 590 if (base::TimeTicks::Now() >= run_cheap_tasks_time_limit_) { | |
| 591 TRACE_EVENT_INSTANT0("cc", "WorkerPool::RunCheapTasks out of time"); | |
| 592 break; | |
| 593 } | |
| 594 | |
| 595 // We must be out of cheap tasks if this happens. | |
| 596 if (check_for_completed_tasks_time_.is_null() || | |
| 597 base::TimeTicks::Now() < run_cheap_tasks_time_limit_) | |
| 598 break; | |
| 599 | |
| 600 TRACE_EVENT_INSTANT0("cc", "WorkerPool::RunCheapTasks check time"); | |
| 601 CancelCheckForCompletedTasks(); | |
| 602 DispatchCompletionCallbacks(); | |
| 603 // Schedule another check for completed tasks if not idle. | |
| 604 if (!is_idle) | |
| 605 ScheduleCheckForCompletedTasks(); | |
| 606 } | |
| 607 } | |
| 608 | |
| 609 } // namespace cc | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 12472028:
Part 1 of cc/ directory shuffles: base (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src