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) 5a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "net/disk_cache/blockfile/in_flight_io.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/bind.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/location.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 1003b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles)#include "base/single_thread_task_runner.h" 1103b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles)#include "base/task_runner.h" 1203b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles)#include "base/thread_task_runner_handle.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/threading/thread_restrictions.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace disk_cache { 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)BackgroundIO::BackgroundIO(InFlightIO* controller) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : result_(-1), io_completed_(true, false), controller_(controller) { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Runs on the primary thread. 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void BackgroundIO::OnIOSignalled() { 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (controller_) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) controller_->InvokeCallback(this, false); 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void BackgroundIO::Cancel() { 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // controller_ may be in use from the background thread at this time. 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock lock(controller_lock_); 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(controller_); 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) controller_ = NULL; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)BackgroundIO::~BackgroundIO() { 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// --------------------------------------------------------------------------- 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)InFlightIO::InFlightIO() 4003b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) : callback_task_runner_(base::ThreadTaskRunnerHandle::Get()), 4103b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) running_(false), 4203b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) single_thread_(false) { 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)InFlightIO::~InFlightIO() { 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Runs on the background thread. 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void BackgroundIO::NotifyController() { 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock lock(controller_lock_); 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (controller_) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) controller_->OnIOComplete(this); 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void InFlightIO::WaitForPendingIO() { 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (!io_list_.empty()) { 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Block the current thread until all pending IO completes. 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) IOList::iterator it = io_list_.begin(); 59868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) InvokeCallback(it->get(), true); 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void InFlightIO::DropPendingIO() { 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (!io_list_.empty()) { 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) IOList::iterator it = io_list_.begin(); 66868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) BackgroundIO* operation = it->get(); 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) operation->Cancel(); 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(io_list_.find(operation) != io_list_.end()); 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) io_list_.erase(make_scoped_refptr(operation)); 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Runs on a background thread. 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void InFlightIO::OnIOComplete(BackgroundIO* operation) { 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef NDEBUG 7603b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) if (callback_task_runner_->RunsTasksOnCurrentThread()) { 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(single_thread_ || !running_); 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) single_thread_ = true; 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8203b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) callback_task_runner_->PostTask( 8303b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) FROM_HERE, base::Bind(&BackgroundIO::OnIOSignalled, operation)); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) operation->io_completed()->Signal(); 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Runs on the primary thread. 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void InFlightIO::InvokeCallback(BackgroundIO* operation, bool cancel_task) { 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // http://crbug.com/74623 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::ThreadRestrictions::ScopedAllowWait allow_wait; 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) operation->io_completed()->Wait(); 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) running_ = true; 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (cancel_task) 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) operation->Cancel(); 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Make sure that we remove the operation from the list before invoking the 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // callback (so that a subsequent cancel does not invoke the callback again). 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(io_list_.find(operation) != io_list_.end()); 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!operation->HasOneRef()); 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) io_list_.erase(make_scoped_refptr(operation)); 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) OnOperationComplete(operation, cancel_task); 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Runs on the primary thread. 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void InFlightIO::OnOperationPosted(BackgroundIO* operation) { 10903b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) DCHECK(callback_task_runner_->RunsTasksOnCurrentThread()); 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) io_list_.insert(make_scoped_refptr(operation)); 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace disk_cache 114