Revert 51456 - Disk cache: Switch the disk cache to use the cache_thread....

net/disk_cache/in_flight_io.cc

-// Copyright (c) 2006-2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "net/disk_cache/in_flight_io.h"
-
-#include "base/logging.h"
-
-namespace disk_cache {
-
-// Runs on the primary thread.
-void BackgroundIO::OnIOSignalled() {
-  if (controller_)
-    controller_->InvokeCallback(this, false);
-}
-
-void BackgroundIO::Cancel() {
-  DCHECK(controller_);
-  controller_ = NULL;
-}
-
-// Runs on the background thread.
-void BackgroundIO::NotifyController() {
-  controller_->OnIOComplete(this);
-}
-
-// ---------------------------------------------------------------------------
-
-void InFlightIO::WaitForPendingIO() {
-  while (!io_list_.empty()) {
-    // Block the current thread until all pending IO completes.
-    IOList::iterator it = io_list_.begin();
-    InvokeCallback(*it, true);
-  }
-}
-
-// Runs on a background thread.
-void InFlightIO::OnIOComplete(BackgroundIO* operation) {
-#ifndef NDEBUG
-  if (callback_thread_ == MessageLoop::current()) {
-    DCHECK(single_thread_ || !running_);
-    single_thread_ = true;
-  }
-  running_ = true;
-#endif
-
-  callback_thread_->PostTask(FROM_HERE,
-                             NewRunnableMethod(operation,
-                                               &BackgroundIO::OnIOSignalled));
-  operation->io_completed()->Signal();
-}
-
-// Runs on the primary thread.
-void InFlightIO::InvokeCallback(BackgroundIO* operation, bool cancel_task) {
-  operation->io_completed()->Wait();
-
-  if (cancel_task)
-    operation->Cancel();
-
-  // Make sure that we remove the operation from the list before invoking the
-  // callback (so that a subsequent cancel does not invoke the callback again).
-  DCHECK(io_list_.find(operation) != io_list_.end());
-  io_list_.erase(operation);
-  OnOperationComplete(operation, cancel_task);
-}
-
-// Runs on the primary thread.
-void InFlightIO::OnOperationPosted(BackgroundIO* operation) {
-  DCHECK(callback_thread_ == MessageLoop::current());
-  io_list_.insert(operation);
-}
-
-}  // namespace disk_cache