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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <functional>
#include <memory>
#include <mutex>
#include <queue>
#include "common/bind.h"
#include "common/callback.h"
#include "common/contextual_callback.h"
#include "os/thread.h"
#include "os/utils.h"
namespace bluetooth {
namespace os {
// A message-queue style handler for reactor-based thread to handle incoming events from different threads. When it's
// constructed, it will register a reactable on the specified thread; when it's destroyed, it will unregister itself
// from the thread.
class Handler : public common::IPostableContext {
public:
// Create and register a handler on given thread
explicit Handler(Thread* thread);
Handler(const Handler&) = delete;
Handler& operator=(const Handler&) = delete;
// Unregister this handler from the thread and release resource. Unhandled events will be discarded and not executed.
virtual ~Handler();
// Enqueue a closure to the queue of this handler
virtual void Post(common::OnceClosure closure) override;
// Remove all pending events from the queue of this handler
void Clear();
// Die if the current reactable doesn't stop before the timeout. Must be called after Clear()
void WaitUntilStopped(std::chrono::milliseconds timeout);
template <typename Functor, typename... Args>
void Call(Functor&& functor, Args&&... args) {
Post(common::BindOnce(std::forward<Functor>(functor), std::forward<Args>(args)...));
}
template <typename T, typename Functor, typename... Args>
void CallOn(T* obj, Functor&& functor, Args&&... args) {
Post(common::BindOnce(std::forward<Functor>(functor), common::Unretained(obj), std::forward<Args>(args)...));
}
template <typename Functor, typename... Args>
common::ContextualOnceCallback<common::MakeUnboundRunType<Functor, Args...>> BindOnce(
Functor&& functor, Args&&... args) {
return common::ContextualOnceCallback<common::MakeUnboundRunType<Functor, Args...>>(
common::BindOnce(std::forward<Functor>(functor), std::forward<Args>(args)...), this);
}
template <typename Functor, typename T, typename... Args>
common::ContextualOnceCallback<common::MakeUnboundRunType<Functor, T, Args...>> BindOnceOn(
T* obj, Functor&& functor, Args&&... args) {
return common::ContextualOnceCallback<common::MakeUnboundRunType<Functor, T, Args...>>(
common::BindOnce(std::forward<Functor>(functor), common::Unretained(obj), std::forward<Args>(args)...), this);
}
template <typename Functor, typename... Args>
common::ContextualCallback<common::MakeUnboundRunType<Functor, Args...>> Bind(Functor&& functor, Args&&... args) {
return common::ContextualCallback<common::MakeUnboundRunType<Functor, Args...>>(
common::Bind(std::forward<Functor>(functor), std::forward<Args>(args)...), this);
}
template <typename Functor, typename T, typename... Args>
common::ContextualCallback<common::MakeUnboundRunType<Functor, T, Args...>> BindOn(
T* obj, Functor&& functor, Args&&... args) {
return common::ContextualCallback<common::MakeUnboundRunType<Functor, T, Args...>>(
common::Bind(std::forward<Functor>(functor), common::Unretained(obj), std::forward<Args>(args)...), this);
}
template <typename T>
friend class Queue;
friend class Alarm;
friend class RepeatingAlarm;
private:
inline bool was_cleared() const {
return tasks_ == nullptr;
};
std::queue<common::OnceClosure>* tasks_;
Thread* thread_;
std::unique_ptr<Reactor::Event> event_;
Reactor::Reactable* reactable_;
mutable std::mutex mutex_;
void handle_next_event();
};
} // namespace os
} // namespace bluetooth
|
