2 // detail/win_iocp_socket_recvfrom_op.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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)
11 #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP
12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP
14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
18 #include <boost/asio/detail/config.hpp>
20 #if defined(BOOST_ASIO_HAS_IOCP)
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>
32 #include <boost/asio/detail/push_options.hpp>
38 template <typename MutableBufferSequence, typename Endpoint, typename Handler>
39 class win_iocp_socket_recvfrom_op : public operation
42 BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvfrom_op);
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),
49 endpoint_size_(static_cast<int>(endpoint.capacity())),
50 cancel_token_(cancel_token),
52 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
58 return endpoint_size_;
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)
65 boost::system::error_code ec(result_ec);
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 };
72 BOOST_ASIO_HANDLER_COMPLETION((o));
74 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
75 // Check whether buffers are still valid.
78 buffer_sequence_adapter<boost::asio::mutable_buffer,
79 MutableBufferSequence>::validate(o->buffers_);
81 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
83 socket_ops::complete_iocp_recvfrom(o->cancel_token_, ec);
85 // Record the size of the endpoint returned by the operation.
86 o->endpoint_.resize(o->endpoint_size_);
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_);
99 // Make the upcall if required.
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;
112 socket_ops::weak_cancel_token_type cancel_token_;
113 MutableBufferSequence buffers_;
117 } // namespace detail
121 #include <boost/asio/detail/pop_options.hpp>
123 #endif // defined(BOOST_ASIO_HAS_IOCP)
125 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP