1 // 2 // detail/win_iocp_socket_recvfrom_op.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2015 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 win_iocp_socket_recvfrom_op(Endpoint & endpoint,socket_ops::weak_cancel_token_type cancel_token,const MutableBufferSequence & buffers,Handler & handler)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 endpoint_size()56 int& endpoint_size() 57 { 58 return endpoint_size_; 59 } 60 do_complete(io_service_impl * owner,operation * base,const boost::system::error_code & result_ec,std::size_t bytes_transferred)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 126