blob: a38776d147ededcf4ca23129efbc4eae5bd2d0f8 [file] [log] [blame]
// Copyright 2013 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 <list>
#include "base/callback.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "build/build_config.h"
#include "content/public/browser/browser_main_runner.h"
namespace content {
// A startup task is a void function returning the status on completion.
// a status of > 0 indicates a failure, and that no further startup tasks should
// be run.
typedef base::Callback<int(void)> StartupTask;
// This class runs startup tasks. The tasks are either run immediately inline,
// or are queued one at a time on the UI thread's message loop. If the events
// are queued, UI events that are received during startup will be acted upon
// between startup tasks. The motivation for this is that, on targets where the
// UI is already started, it allows us to keep the UI responsive during startup.
// Note that this differs from a SingleThreadedTaskRunner in that there may be
// no opportunity to handle UI events between the tasks of a
// SingleThreadedTaskRunner.
class CONTENT_EXPORT StartupTaskRunner {
// Constructor: Note that |startup_complete_callback| is optional. If it is
// not null it will be called once all the startup tasks have run.
StartupTaskRunner(base::OnceCallback<void(int)> startup_complete_callback,
scoped_refptr<base::SingleThreadTaskRunner> proxy);
// Add a task to the queue of startup tasks to be run.
void AddTask(StartupTask callback);
// Start running the tasks asynchronously.
void StartRunningTasksAsync();
// Run all tasks, or all remaining tasks, synchronously
void RunAllTasksNow();
friend class base::RefCounted<StartupTaskRunner>;
std::list<StartupTask> task_list_;
void WrappedTask();
base::OnceCallback<void(int)> startup_complete_callback_;
scoped_refptr<base::SingleThreadTaskRunner> proxy_;
} // namespace content