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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
//
// io_object_executor.hpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP
#define BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <boost/asio/detail/handler_invoke_helpers.hpp>
#include <boost/asio/detail/type_traits.hpp>
#include <boost/asio/io_context.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
// Wrap the (potentially polymorphic) executor so that we can bypass it when
// dispatching on a target executor that has a native I/O implementation.
template <typename Executor>
class io_object_executor
{
public:
io_object_executor(const Executor& ex,
bool native_implementation) BOOST_ASIO_NOEXCEPT
: executor_(ex),
has_native_impl_(native_implementation)
{
}
io_object_executor(const io_object_executor& other) BOOST_ASIO_NOEXCEPT
: executor_(other.executor_),
has_native_impl_(other.has_native_impl_)
{
}
template <typename Executor1>
io_object_executor(
const io_object_executor<Executor1>& other) BOOST_ASIO_NOEXCEPT
: executor_(other.inner_executor()),
has_native_impl_(other.has_native_implementation())
{
}
#if defined(BOOST_ASIO_HAS_MOVE)
io_object_executor(io_object_executor&& other) BOOST_ASIO_NOEXCEPT
: executor_(BOOST_ASIO_MOVE_CAST(Executor)(other.executor_)),
has_native_impl_(other.has_native_impl_)
{
}
#endif // defined(BOOST_ASIO_HAS_MOVE)
const Executor& inner_executor() const BOOST_ASIO_NOEXCEPT
{
return executor_;
}
bool has_native_implementation() const BOOST_ASIO_NOEXCEPT
{
return has_native_impl_;
}
execution_context& context() const BOOST_ASIO_NOEXCEPT
{
return executor_.context();
}
void on_work_started() const BOOST_ASIO_NOEXCEPT
{
if (is_same<Executor, io_context::executor_type>::value
|| has_native_impl_)
{
// When using a native implementation, work is already counted by the
// execution context.
}
else
{
executor_.on_work_started();
}
}
void on_work_finished() const BOOST_ASIO_NOEXCEPT
{
if (is_same<Executor, io_context::executor_type>::value
|| has_native_impl_)
{
// When using a native implementation, work is already counted by the
// execution context.
}
else
{
executor_.on_work_finished();
}
}
template <typename F, typename A>
void dispatch(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const
{
if (is_same<Executor, io_context::executor_type>::value
|| has_native_impl_)
{
// When using a native implementation, I/O completion handlers are
// already dispatched according to the execution context's executor's
// rules. We can call the function directly.
#if defined(BOOST_ASIO_HAS_MOVE)
if (is_same<F, typename decay<F>::type>::value)
{
boost_asio_handler_invoke_helpers::invoke(f, f);
return;
}
#endif // defined(BOOST_ASIO_HAS_MOVE)
typename decay<F>::type function(BOOST_ASIO_MOVE_CAST(F)(f));
boost_asio_handler_invoke_helpers::invoke(function, function);
}
else
{
executor_.dispatch(BOOST_ASIO_MOVE_CAST(F)(f), a);
}
}
template <typename F, typename A>
void post(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const
{
executor_.post(BOOST_ASIO_MOVE_CAST(F)(f), a);
}
template <typename F, typename A>
void defer(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const
{
executor_.defer(BOOST_ASIO_MOVE_CAST(F)(f), a);
}
friend bool operator==(const io_object_executor& a,
const io_object_executor& b) BOOST_ASIO_NOEXCEPT
{
return a.executor_ == b.executor_
&& a.has_native_impl_ == b.has_native_impl_;
}
friend bool operator!=(const io_object_executor& a,
const io_object_executor& b) BOOST_ASIO_NOEXCEPT
{
return a.executor_ != b.executor_
|| a.has_native_impl_ != b.has_native_impl_;
}
private:
Executor executor_;
const bool has_native_impl_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP
|
