chromium/base/task/sequence_manager/wake_up_queue.h

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TASK_SEQUENCE_MANAGER_WAKE_UP_QUEUE_H_
#define BASE_TASK_SEQUENCE_MANAGER_WAKE_UP_QUEUE_H_

#include <optional>

#include "base/base_export.h"
#include "base/check.h"
#include "base/containers/intrusive_heap.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/raw_ptr_exclusion.h"
#include "base/task/common/lazy_now.h"
#include "base/task/sequence_manager/task_queue_impl.h"
#include "base/time/time.h"
#include "base/values.h"

namespace base {
namespace sequence_manager {

class EnqueueOrder;

namespace internal {

class AssociatedThreadId;
class SequenceManagerImpl;
class TaskQueueImpl;

// WakeUpQueue is a queue of (wake_up, TaskQueueImpl*) pairs which
// aggregates wake-ups from multiple TaskQueueImpl into a single wake-up, and
// notifies TaskQueueImpls when wake-up times are reached.
class BASE_EXPORT WakeUpQueue { … };

// Default WakeUpQueue implementation that forwards wake-ups to
// `sequence_manager_`.
class BASE_EXPORT DefaultWakeUpQueue : public WakeUpQueue { … };

// WakeUpQueue implementation that doesn't sends wake-ups to
// any SequenceManager, such that task queues don't cause wake-ups.
class BASE_EXPORT NonWakingWakeUpQueue : public WakeUpQueue { … };

}  // namespace internal
}  // namespace sequence_manager
}  // namespace base

#endif  // BASE_TASK_SEQUENCE_MANAGER_WAKE_UP_QUEUE_H_