blob: e4fb7b55732e2165995da15138c8f50b46c0fd52 (
plain)
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
|
// Copyright 2014 The Chromium 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 CC_BASE_UNIQUE_NOTIFIER_H_
#define CC_BASE_UNIQUE_NOTIFIER_H_
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "cc/base/base_export.h"
namespace base {
class SequencedTaskRunner;
} // namespace base
namespace cc {
class CC_BASE_EXPORT UniqueNotifier {
public:
// Configure this notifier to issue the |closure| notification when scheduled.
UniqueNotifier(base::SequencedTaskRunner* task_runner,
const base::Closure& closure);
// Destroying the notifier will ensure that no further notifications will
// happen from this class.
~UniqueNotifier();
// Schedule a notification to be run. If another notification is already
// pending, then only one notification will take place.
void Schedule();
// Cancel a pending notification, if one was scheduled.
void Cancel();
private:
void Notify();
// TODO(dcheng): How come this doesn't need to hold a ref to the task runner?
base::SequencedTaskRunner* const task_runner_;
const base::Closure closure_;
// Lock should be held before modifying |notification_pending_|.
base::Lock lock_;
bool notification_pending_;
base::WeakPtrFactory<UniqueNotifier> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(UniqueNotifier);
};
} // namespace cc
#endif // CC_BASE_UNIQUE_NOTIFIER_H_
|
