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 "chrome/common/worker_thread_ticker.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <algorithm> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/bind.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/bind_helpers.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 129ab5563a3196760eb381d102cbb2bc0f7abc6a50Ben Murdoch#include "base/message_loop/message_loop.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/threading/thread.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WorkerThreadTicker::WorkerThreadTicker(int tick_interval) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : timer_thread_("worker_thread_ticker"), 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) is_running_(false), 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tick_interval_(base::TimeDelta::FromMilliseconds(tick_interval)) { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WorkerThreadTicker::~WorkerThreadTicker() { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Stop(); 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool WorkerThreadTicker::RegisterTickHandler(Callback *tick_handler) { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(tick_handler); 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock lock(lock_); 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // You cannot change the list of handlers when the timer is running. 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // You need to call Stop first. 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (IsRunning()) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tick_handler_list_.push_back(tick_handler); 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool WorkerThreadTicker::UnregisterTickHandler(Callback *tick_handler) { 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(tick_handler); 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock lock(lock_); 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // You cannot change the list of handlers when the timer is running. 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // You need to call Stop first. 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (IsRunning()) { 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TickHandlerListType::iterator index = std::remove(tick_handler_list_.begin(), 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tick_handler_list_.end(), 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tick_handler); 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (index == tick_handler_list_.end()) { 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tick_handler_list_.erase(index, tick_handler_list_.end()); 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool WorkerThreadTicker::Start() { 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Do this in a lock because we don't want 2 threads to 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // call Start at the same time 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock lock(lock_); 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (IsRunning()) 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!timer_thread_.Start()) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) is_running_ = true; 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScheduleTimerTask(); 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool WorkerThreadTicker::Stop() { 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Do this in a lock because we don't want 2 threads to 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // call Stop at the same time 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock lock(lock_); 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!IsRunning()) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) is_running_ = false; 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) timer_thread_.Stop(); 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WorkerThreadTicker::ScheduleTimerTask() { 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) timer_thread_.message_loop()->PostDelayedTask( 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FROM_HERE, 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::Bind(&WorkerThreadTicker::TimerTask, base::Unretained(this)), 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tick_interval_); 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WorkerThreadTicker::TimerTask() { 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // When the ticker is running, the handler list CANNOT be modified. 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // So we can do the enumeration safely without a lock 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const TickHandlerListType& handlers = tick_handler_list_; 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (TickHandlerListType::const_iterator i = handlers.begin(); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) i != handlers.end(); ++i) { 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (*i)->OnTick(); 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScheduleTimerTask(); 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 97