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1 | // | |
2 | // detail/win_iocp_socket_recvfrom_op.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
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_WIN_IOCP_SOCKET_RECVFROM_OP_HPP | |
12 | #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_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 | ||
20 | #if defined(BOOST_ASIO_HAS_IOCP) | |
21 | ||
22 | #include <boost/asio/detail/addressof.hpp> | |
23 | #include <boost/asio/detail/bind_handler.hpp> | |
24 | #include <boost/asio/detail/buffer_sequence_adapter.hpp> | |
25 | #include <boost/asio/detail/fenced_block.hpp> | |
26 | #include <boost/asio/detail/handler_alloc_helpers.hpp> | |
27 | #include <boost/asio/detail/handler_invoke_helpers.hpp> | |
28 | #include <boost/asio/detail/operation.hpp> | |
29 | #include <boost/asio/detail/socket_ops.hpp> | |
30 | #include <boost/asio/error.hpp> | |
31 | ||
32 | #include <boost/asio/detail/push_options.hpp> | |
33 | ||
34 | namespace boost { | |
35 | namespace asio { | |
36 | namespace detail { | |
37 | ||
38 | template <typename MutableBufferSequence, typename Endpoint, typename Handler> | |
39 | class win_iocp_socket_recvfrom_op : public operation | |
40 | { | |
41 | public: | |
42 | BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvfrom_op); | |
43 | ||
44 | win_iocp_socket_recvfrom_op(Endpoint& endpoint, | |
45 | socket_ops::weak_cancel_token_type cancel_token, | |
46 | const MutableBufferSequence& buffers, Handler& handler) | |
47 | : operation(&win_iocp_socket_recvfrom_op::do_complete), | |
48 | endpoint_(endpoint), | |
49 | endpoint_size_(static_cast<int>(endpoint.capacity())), | |
50 | cancel_token_(cancel_token), | |
51 | buffers_(buffers), | |
52 | handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)) | |
53 | { | |
54 | } | |
55 | ||
56 | int& endpoint_size() | |
57 | { | |
58 | return endpoint_size_; | |
59 | } | |
60 | ||
61 | static void do_complete(io_service_impl* owner, operation* base, | |
62 | const boost::system::error_code& result_ec, | |
63 | std::size_t bytes_transferred) | |
64 | { | |
65 | boost::system::error_code ec(result_ec); | |
66 | ||
67 | // Take ownership of the operation object. | |
68 | win_iocp_socket_recvfrom_op* o( | |
69 | static_cast<win_iocp_socket_recvfrom_op*>(base)); | |
70 | ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; | |
71 | ||
72 | BOOST_ASIO_HANDLER_COMPLETION((o)); | |
73 | ||
74 | #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) | |
75 | // Check whether buffers are still valid. | |
76 | if (owner) | |
77 | { | |
78 | buffer_sequence_adapter<boost::asio::mutable_buffer, | |
79 | MutableBufferSequence>::validate(o->buffers_); | |
80 | } | |
81 | #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) | |
82 | ||
83 | socket_ops::complete_iocp_recvfrom(o->cancel_token_, ec); | |
84 | ||
85 | // Record the size of the endpoint returned by the operation. | |
86 | o->endpoint_.resize(o->endpoint_size_); | |
87 | ||
88 | // Make a copy of the handler so that the memory can be deallocated before | |
89 | // the upcall is made. Even if we're not about to make an upcall, a | |
90 | // sub-object of the handler may be the true owner of the memory associated | |
91 | // with the handler. Consequently, a local copy of the handler is required | |
92 | // to ensure that any owning sub-object remains valid until after we have | |
93 | // deallocated the memory here. | |
94 | detail::binder2<Handler, boost::system::error_code, std::size_t> | |
95 | handler(o->handler_, ec, bytes_transferred); | |
96 | p.h = boost::asio::detail::addressof(handler.handler_); | |
97 | p.reset(); | |
98 | ||
99 | // Make the upcall if required. | |
100 | if (owner) | |
101 | { | |
102 | fenced_block b(fenced_block::half); | |
103 | BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); | |
104 | boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_); | |
105 | BOOST_ASIO_HANDLER_INVOCATION_END; | |
106 | } | |
107 | } | |
108 | ||
109 | private: | |
110 | Endpoint& endpoint_; | |
111 | int endpoint_size_; | |
112 | socket_ops::weak_cancel_token_type cancel_token_; | |
113 | MutableBufferSequence buffers_; | |
114 | Handler handler_; | |
115 | }; | |
116 | ||
117 | } // namespace detail | |
118 | } // namespace asio | |
119 | } // namespace boost | |
120 | ||
121 | #include <boost/asio/detail/pop_options.hpp> | |
122 | ||
123 | #endif // defined(BOOST_ASIO_HAS_IOCP) | |
124 | ||
125 | #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP |