1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65


base / task / sequence_manager / delayed_task_handle_delegate.h [blame]

// 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_DELAYED_TASK_HANDLE_DELEGATE_H_
#define BASE_TASK_SEQUENCE_MANAGER_DELAYED_TASK_HANDLE_DELEGATE_H_

#include "base/containers/intrusive_heap.h"
#include "base/memory/raw_ptr_exclusion.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/task/delayed_task_handle.h"

namespace base {
namespace sequence_manager {
namespace internal {

class TaskQueueImpl;

class DelayedTaskHandleDelegate : public DelayedTaskHandle::Delegate {
 public:
  explicit DelayedTaskHandleDelegate(TaskQueueImpl* outer);

  DelayedTaskHandleDelegate(const DelayedTaskHandleDelegate&) = delete;
  DelayedTaskHandleDelegate& operator=(const DelayedTaskHandleDelegate&) =
      delete;

  ~DelayedTaskHandleDelegate() override;

  WeakPtr<DelayedTaskHandleDelegate> AsWeakPtr();

  // DelayedTaskHandle::Delegate:
  bool IsValid() const override;
  void CancelTask() override;

  void SetHeapHandle(HeapHandle heap_handle);
  void ClearHeapHandle();
  HeapHandle GetHeapHandle();

  // Indicates that this task will be executed. This will invalidate the handle.
  void WillRunTask();

 private:
  // The TaskQueueImpl where the task was posted.
  // RAW_PTR_EXCLUSION: Performance reasons (based on analysis of speedometer3).
  RAW_PTR_EXCLUSION TaskQueueImpl* const outer_
      GUARDED_BY_CONTEXT(sequence_checker_) = nullptr;

  // The HeapHandle to the task, if the task is in the DelayedIncomingQueue,
  // invalid otherwise.
  HeapHandle heap_handle_ GUARDED_BY_CONTEXT(sequence_checker_);

  SEQUENCE_CHECKER(sequence_checker_);

  // Allows TaskQueueImpl to retain a weak reference to |this|. An outstanding
  // weak pointer indicates that the task is valid.
  WeakPtrFactory<DelayedTaskHandleDelegate> weak_ptr_factory_
      GUARDED_BY_CONTEXT(sequence_checker_){this};
};

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

#endif  // BASE_TASK_SEQUENCE_MANAGER_DELAYED_TASK_HANDLE_DELEGATE_H_