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1 | // |
2 | // io_object_executor.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
f67539c2 | 5 | // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
92f5a8d4 TL |
6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #ifndef BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP | |
12 | #define BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP | |
13 | ||
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
15 | # pragma once | |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
17 | ||
18 | #include <boost/asio/detail/config.hpp> | |
19 | #include <boost/asio/detail/handler_invoke_helpers.hpp> | |
20 | #include <boost/asio/detail/type_traits.hpp> | |
21 | #include <boost/asio/io_context.hpp> | |
22 | ||
23 | #include <boost/asio/detail/push_options.hpp> | |
24 | ||
25 | namespace boost { | |
26 | namespace asio { | |
27 | namespace detail { | |
28 | ||
29 | // Wrap the (potentially polymorphic) executor so that we can bypass it when | |
30 | // dispatching on a target executor that has a native I/O implementation. | |
31 | template <typename Executor> | |
32 | class io_object_executor | |
33 | { | |
34 | public: | |
35 | io_object_executor(const Executor& ex, | |
36 | bool native_implementation) BOOST_ASIO_NOEXCEPT | |
37 | : executor_(ex), | |
38 | has_native_impl_(native_implementation) | |
39 | { | |
40 | } | |
41 | ||
42 | io_object_executor(const io_object_executor& other) BOOST_ASIO_NOEXCEPT | |
43 | : executor_(other.executor_), | |
44 | has_native_impl_(other.has_native_impl_) | |
45 | { | |
46 | } | |
47 | ||
48 | template <typename Executor1> | |
49 | io_object_executor( | |
50 | const io_object_executor<Executor1>& other) BOOST_ASIO_NOEXCEPT | |
51 | : executor_(other.inner_executor()), | |
52 | has_native_impl_(other.has_native_implementation()) | |
53 | { | |
54 | } | |
55 | ||
56 | #if defined(BOOST_ASIO_HAS_MOVE) | |
57 | io_object_executor(io_object_executor&& other) BOOST_ASIO_NOEXCEPT | |
58 | : executor_(BOOST_ASIO_MOVE_CAST(Executor)(other.executor_)), | |
59 | has_native_impl_(other.has_native_impl_) | |
60 | { | |
61 | } | |
62 | #endif // defined(BOOST_ASIO_HAS_MOVE) | |
63 | ||
64 | const Executor& inner_executor() const BOOST_ASIO_NOEXCEPT | |
65 | { | |
66 | return executor_; | |
67 | } | |
68 | ||
69 | bool has_native_implementation() const BOOST_ASIO_NOEXCEPT | |
70 | { | |
71 | return has_native_impl_; | |
72 | } | |
73 | ||
74 | execution_context& context() const BOOST_ASIO_NOEXCEPT | |
75 | { | |
76 | return executor_.context(); | |
77 | } | |
78 | ||
79 | void on_work_started() const BOOST_ASIO_NOEXCEPT | |
80 | { | |
81 | if (is_same<Executor, io_context::executor_type>::value | |
82 | || has_native_impl_) | |
83 | { | |
84 | // When using a native implementation, work is already counted by the | |
85 | // execution context. | |
86 | } | |
87 | else | |
88 | { | |
89 | executor_.on_work_started(); | |
90 | } | |
91 | } | |
92 | ||
93 | void on_work_finished() const BOOST_ASIO_NOEXCEPT | |
94 | { | |
95 | if (is_same<Executor, io_context::executor_type>::value | |
96 | || has_native_impl_) | |
97 | { | |
98 | // When using a native implementation, work is already counted by the | |
99 | // execution context. | |
100 | } | |
101 | else | |
102 | { | |
103 | executor_.on_work_finished(); | |
104 | } | |
105 | } | |
106 | ||
107 | template <typename F, typename A> | |
108 | void dispatch(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const | |
109 | { | |
110 | if (is_same<Executor, io_context::executor_type>::value | |
111 | || has_native_impl_) | |
112 | { | |
113 | // When using a native implementation, I/O completion handlers are | |
114 | // already dispatched according to the execution context's executor's | |
115 | // rules. We can call the function directly. | |
116 | #if defined(BOOST_ASIO_HAS_MOVE) | |
117 | if (is_same<F, typename decay<F>::type>::value) | |
118 | { | |
119 | boost_asio_handler_invoke_helpers::invoke(f, f); | |
120 | return; | |
121 | } | |
122 | #endif // defined(BOOST_ASIO_HAS_MOVE) | |
123 | typename decay<F>::type function(BOOST_ASIO_MOVE_CAST(F)(f)); | |
124 | boost_asio_handler_invoke_helpers::invoke(function, function); | |
125 | } | |
126 | else | |
127 | { | |
128 | executor_.dispatch(BOOST_ASIO_MOVE_CAST(F)(f), a); | |
129 | } | |
130 | } | |
131 | ||
132 | template <typename F, typename A> | |
133 | void post(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const | |
134 | { | |
135 | executor_.post(BOOST_ASIO_MOVE_CAST(F)(f), a); | |
136 | } | |
137 | ||
138 | template <typename F, typename A> | |
139 | void defer(BOOST_ASIO_MOVE_ARG(F) f, const A& a) const | |
140 | { | |
141 | executor_.defer(BOOST_ASIO_MOVE_CAST(F)(f), a); | |
142 | } | |
143 | ||
144 | friend bool operator==(const io_object_executor& a, | |
145 | const io_object_executor& b) BOOST_ASIO_NOEXCEPT | |
146 | { | |
147 | return a.executor_ == b.executor_ | |
148 | && a.has_native_impl_ == b.has_native_impl_; | |
149 | } | |
150 | ||
151 | friend bool operator!=(const io_object_executor& a, | |
152 | const io_object_executor& b) BOOST_ASIO_NOEXCEPT | |
153 | { | |
154 | return a.executor_ != b.executor_ | |
155 | || a.has_native_impl_ != b.has_native_impl_; | |
156 | } | |
157 | ||
158 | private: | |
159 | Executor executor_; | |
160 | const bool has_native_impl_; | |
161 | }; | |
162 | ||
163 | } // namespace detail | |
164 | } // namespace asio | |
165 | } // namespace boost | |
166 | ||
167 | #include <boost/asio/detail/pop_options.hpp> | |
168 | ||
169 | #endif // BOOST_ASIO_DETAIL_IO_OBJECT_EXECUTOR_HPP |