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7c673cae | 1 | // |
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2 | // detail/reactive_wait_op.hpp |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
7c673cae | 4 | // |
11fdf7f2 | 5 | // Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
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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 | ||
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11 | #ifndef BOOST_ASIO_DETAIL_REACTIVE_WAIT_OP_HPP |
12 | #define BOOST_ASIO_DETAIL_REACTIVE_WAIT_OP_HPP | |
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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> | |
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19 | #include <boost/asio/detail/fenced_block.hpp> |
20 | #include <boost/asio/detail/handler_alloc_helpers.hpp> | |
21 | #include <boost/asio/detail/handler_invoke_helpers.hpp> | |
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22 | #include <boost/asio/detail/memory.hpp> |
23 | #include <boost/asio/detail/reactor_op.hpp> | |
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24 | |
25 | #include <boost/asio/detail/push_options.hpp> | |
26 | ||
27 | namespace boost { | |
28 | namespace asio { | |
29 | namespace detail { | |
30 | ||
31 | template <typename Handler> | |
b32b8144 | 32 | class reactive_wait_op : public reactor_op |
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33 | { |
34 | public: | |
b32b8144 | 35 | BOOST_ASIO_DEFINE_HANDLER_PTR(reactive_wait_op); |
7c673cae | 36 | |
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37 | reactive_wait_op(Handler& handler) |
38 | : reactor_op(&reactive_wait_op::do_perform, | |
39 | &reactive_wait_op::do_complete), | |
40 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)) | |
7c673cae | 41 | { |
b32b8144 | 42 | handler_work<Handler>::start(handler_); |
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43 | } |
44 | ||
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45 | static status do_perform(reactor_op*) |
46 | { | |
47 | return done; | |
48 | } | |
49 | ||
50 | static void do_complete(void* owner, operation* base, | |
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51 | const boost::system::error_code& /*ec*/, |
52 | std::size_t /*bytes_transferred*/) | |
53 | { | |
54 | // Take ownership of the handler object. | |
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55 | reactive_wait_op* o(static_cast<reactive_wait_op*>(base)); |
56 | ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; | |
57 | handler_work<Handler> w(o->handler_); | |
7c673cae | 58 | |
b32b8144 | 59 | BOOST_ASIO_HANDLER_COMPLETION((*o)); |
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60 | |
61 | // Make a copy of the handler so that the memory can be deallocated before | |
62 | // the upcall is made. Even if we're not about to make an upcall, a | |
63 | // sub-object of the handler may be the true owner of the memory associated | |
64 | // with the handler. Consequently, a local copy of the handler is required | |
65 | // to ensure that any owning sub-object remains valid until after we have | |
66 | // deallocated the memory here. | |
67 | detail::binder1<Handler, boost::system::error_code> | |
b32b8144 | 68 | handler(o->handler_, o->ec_); |
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69 | p.h = boost::asio::detail::addressof(handler.handler_); |
70 | p.reset(); | |
71 | ||
72 | // Make the upcall if required. | |
73 | if (owner) | |
74 | { | |
75 | fenced_block b(fenced_block::half); | |
76 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_)); | |
b32b8144 | 77 | w.complete(handler, handler.handler_); |
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78 | BOOST_ASIO_HANDLER_INVOCATION_END; |
79 | } | |
80 | } | |
81 | ||
82 | private: | |
83 | Handler handler_; | |
84 | }; | |
85 | ||
86 | } // namespace detail | |
87 | } // namespace asio | |
88 | } // namespace boost | |
89 | ||
90 | #include <boost/asio/detail/pop_options.hpp> | |
91 | ||
b32b8144 | 92 | #endif // BOOST_ASIO_DETAIL_REACTIVE_WAIT_OP_HPP |