chromium/v8/src/tasks/cancelable-task.h

// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_TASKS_CANCELABLE_TASK_H_
#define V8_TASKS_CANCELABLE_TASK_H_

#include <atomic>
#include <unordered_map>

#include "include/v8-platform.h"
#include "src/base/macros.h"
#include "src/base/platform/condition-variable.h"

namespace v8 {
namespace internal {

class Cancelable;
class Isolate;

// The possible outcomes of trying to abort a job are:
// (1) The task is already finished running or was canceled before and
//     thus has been removed from the manager.
// (2) The task is currently running and cannot be canceled anymore.
// (3) The task is not yet running (or finished) so it is canceled and
//     removed.
enum class TryAbortResult { … };

// Keeps track of cancelable tasks. It is possible to register and remove tasks
// from any fore- and background task/thread.
class V8_EXPORT_PRIVATE CancelableTaskManager { … };

class V8_EXPORT_PRIVATE Cancelable { … };

// Multiple inheritance can be used because Task is a pure interface.
class V8_EXPORT_PRIVATE CancelableTask : public Cancelable,
                                         NON_EXPORTED_BASE(public Task) { … };

// Multiple inheritance can be used because IdleTask is a pure interface.
class CancelableIdleTask : public Cancelable, public IdleTask { … };

}  // namespace internal
}  // namespace v8

#endif  // V8_TASKS_CANCELABLE_TASK_H_