15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/threading/worker_pool.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/bind.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/compiler_specific.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/lazy_instance.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/task_runner.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/threading/post_task_and_reply_impl.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/tracked_objects.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace { 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class PostTaskAndReplyWorkerPool : public internal::PostTaskAndReplyImpl { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) explicit PostTaskAndReplyWorkerPool(bool task_is_slow) 212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) : task_is_slow_(task_is_slow) { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool PostTask(const tracked_objects::Location& from_here, 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Closure& task) OVERRIDE { 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return WorkerPool::PostTask(from_here, task, task_is_slow_); 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool task_is_slow_; 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// WorkerPoolTaskRunner --------------------------------------------- 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// A TaskRunner which posts tasks to a WorkerPool with a 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// fixed ShutdownBehavior. 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Note that this class is RefCountedThreadSafe (inherited from TaskRunner). 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class WorkerPoolTaskRunner : public TaskRunner { 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) explicit WorkerPoolTaskRunner(bool tasks_are_slow); 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TaskRunner implementation 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool PostDelayedTask(const tracked_objects::Location& from_here, 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Closure& task, 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TimeDelta delay) OVERRIDE; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool RunsTasksOnCurrentThread() const OVERRIDE; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~WorkerPoolTaskRunner(); 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Helper function for posting a delayed task. Asserts that the delay is 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // zero because non-zero delays are not supported. 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool PostDelayedTaskAssertZeroDelay( 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const tracked_objects::Location& from_here, 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Closure& task, 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::TimeDelta delay); 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const bool tasks_are_slow_; 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(WorkerPoolTaskRunner); 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WorkerPoolTaskRunner::WorkerPoolTaskRunner(bool tasks_are_slow) 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : tasks_are_slow_(tasks_are_slow) { 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WorkerPoolTaskRunner::~WorkerPoolTaskRunner() { 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool WorkerPoolTaskRunner::PostDelayedTask( 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const tracked_objects::Location& from_here, 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Closure& task, 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TimeDelta delay) { 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return PostDelayedTaskAssertZeroDelay(from_here, task, delay); 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool WorkerPoolTaskRunner::RunsTasksOnCurrentThread() const { 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return WorkerPool::RunsTasksOnCurrentThread(); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool WorkerPoolTaskRunner::PostDelayedTaskAssertZeroDelay( 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const tracked_objects::Location& from_here, 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Closure& task, 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::TimeDelta delay) { 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(delay.InMillisecondsRoundedUp(), 0) 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << "WorkerPoolTaskRunner does not support non-zero delays"; 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return WorkerPool::PostTask(from_here, task, tasks_are_slow_); 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct TaskRunnerHolder { 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TaskRunnerHolder() { 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) taskrunners_[0] = new WorkerPoolTaskRunner(false); 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) taskrunners_[1] = new WorkerPoolTaskRunner(true); 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<TaskRunner> taskrunners_[2]; 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)base::LazyInstance<TaskRunnerHolder>::Leaky 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_taskrunners = LAZY_INSTANCE_INITIALIZER; 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool WorkerPool::PostTaskAndReply(const tracked_objects::Location& from_here, 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Closure& task, 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Closure& reply, 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool task_is_slow) { 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return PostTaskAndReplyWorkerPool(task_is_slow).PostTaskAndReply( 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) from_here, task, reply); 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const scoped_refptr<TaskRunner>& 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WorkerPool::GetTaskRunner(bool tasks_are_slow) { 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return g_taskrunners.Get().taskrunners_[tasks_are_slow]; 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace base 118