0
Files
src/content/browser/startup_task_runner.h
Colin Blundell 1c7c45672b [Histograms] Remove expired Startup.StartupTaskRunner.AsyncTaskQueueTime
Bug: 1370598
Change-Id: If3496338f16e21c0f32b1fd397ef250eaaf49dcd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4679173
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1170038}
2023-07-13 17:52:37 +00:00

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2.3 KiB
C++

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_
#define CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_
#include <list>
#include "base/functional/callback.h"
#include "base/task/single_thread_task_runner.h"
#include "content/common/content_export.h"
#include "base/task/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.
using StartupTask = base::OnceCallback<int(void)>;
// 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 {
public:
// 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);
StartupTaskRunner(const StartupTaskRunner&) = delete;
StartupTaskRunner& operator=(const StartupTaskRunner&) = delete;
~StartupTaskRunner();
// 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();
private:
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
#endif // CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_