4e1b7bc33d
The methodology used to generate this CL is documented in https://crbug.com/1098010#c34. No-Try: true No-Presubmit: true Bug: 1098010 Change-Id: I8c0f009d16350271f07d8e5e561085822cc9dd27 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3895935 Owners-Override: Avi Drissman <avi@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org> Commit-Queue: Mark Mentovai <mark@chromium.org> Auto-Submit: Avi Drissman <avi@chromium.org> Cr-Commit-Position: refs/heads/main@{#1047456}
73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
// Copyright 2013 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_
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#define CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_
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#include <list>
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#include "base/callback.h"
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#include "base/task/single_thread_task_runner.h"
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#include "base/time/time.h"
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#include "content/common/content_export.h"
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#include "build/build_config.h"
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#include "content/public/browser/browser_main_runner.h"
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namespace content {
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// A startup task is a void function returning the status on completion.
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// a status of > 0 indicates a failure, and that no further startup tasks should
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// be run.
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using StartupTask = base::OnceCallback<int(void)>;
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// This class runs startup tasks. The tasks are either run immediately inline,
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// or are queued one at a time on the UI thread's message loop. If the events
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// are queued, UI events that are received during startup will be acted upon
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// between startup tasks. The motivation for this is that, on targets where the
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// UI is already started, it allows us to keep the UI responsive during startup.
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//
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// Note that this differs from a SingleThreadedTaskRunner in that there may be
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// no opportunity to handle UI events between the tasks of a
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// SingleThreadedTaskRunner.
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class CONTENT_EXPORT StartupTaskRunner {
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public:
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// Constructor: Note that |startup_complete_callback| is optional. If it is
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// not null it will be called once all the startup tasks have run.
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StartupTaskRunner(base::OnceCallback<void(int)> startup_complete_callback,
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scoped_refptr<base::SingleThreadTaskRunner> proxy);
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StartupTaskRunner(const StartupTaskRunner&) = delete;
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StartupTaskRunner& operator=(const StartupTaskRunner&) = delete;
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~StartupTaskRunner();
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// Add a task to the queue of startup tasks to be run.
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void AddTask(StartupTask callback);
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// Start running the tasks asynchronously.
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void StartRunningTasksAsync();
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// Run all tasks, or all remaining tasks, synchronously
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void RunAllTasksNow();
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private:
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friend class base::RefCounted<StartupTaskRunner>;
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std::list<StartupTask> task_list_;
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void WrappedTask();
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base::OnceCallback<void(int)> startup_complete_callback_;
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// Stores the time that the last post of a WrappedTask occurred. Used for
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// gathering metrics.
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base::TimeTicks last_wrapped_task_post_time_;
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scoped_refptr<base::SingleThreadTaskRunner> proxy_;
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};
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} // namespace content
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#endif // CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_
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