1 // 2 // detail/win_iocp_socket_recv_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_RECV_OP_HPP 12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECV_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 Handler> 39 class win_iocp_socket_recv_op : public operation 40 { 41 public: 42 BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recv_op); 43 win_iocp_socket_recv_op(socket_ops::state_type state,socket_ops::weak_cancel_token_type cancel_token,const MutableBufferSequence & buffers,Handler & handler)44 win_iocp_socket_recv_op(socket_ops::state_type state, 45 socket_ops::weak_cancel_token_type cancel_token, 46 const MutableBufferSequence& buffers, Handler& handler) 47 : operation(&win_iocp_socket_recv_op::do_complete), 48 state_(state), 49 cancel_token_(cancel_token), 50 buffers_(buffers), 51 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)) 52 { 53 } 54 do_complete(io_service_impl * owner,operation * base,const boost::system::error_code & result_ec,std::size_t bytes_transferred)55 static void do_complete(io_service_impl* owner, operation* base, 56 const boost::system::error_code& result_ec, 57 std::size_t bytes_transferred) 58 { 59 boost::system::error_code ec(result_ec); 60 61 // Take ownership of the operation object. 62 win_iocp_socket_recv_op* o(static_cast<win_iocp_socket_recv_op*>(base)); 63 ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; 64 65 BOOST_ASIO_HANDLER_COMPLETION((o)); 66 67 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 68 // Check whether buffers are still valid. 69 if (owner) 70 { 71 buffer_sequence_adapter<boost::asio::mutable_buffer, 72 MutableBufferSequence>::validate(o->buffers_); 73 } 74 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 75 76 socket_ops::complete_iocp_recv(o->state_, o->cancel_token_, 77 buffer_sequence_adapter<boost::asio::mutable_buffer, 78 MutableBufferSequence>::all_empty(o->buffers_), 79 ec, bytes_transferred); 80 81 // Make a copy of the handler so that the memory can be deallocated before 82 // the upcall is made. Even if we're not about to make an upcall, a 83 // sub-object of the handler may be the true owner of the memory associated 84 // with the handler. Consequently, a local copy of the handler is required 85 // to ensure that any owning sub-object remains valid until after we have 86 // deallocated the memory here. 87 detail::binder2<Handler, boost::system::error_code, std::size_t> 88 handler(o->handler_, ec, bytes_transferred); 89 p.h = boost::asio::detail::addressof(handler.handler_); 90 p.reset(); 91 92 // Make the upcall if required. 93 if (owner) 94 { 95 fenced_block b(fenced_block::half); 96 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 97 boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_); 98 BOOST_ASIO_HANDLER_INVOCATION_END; 99 } 100 } 101 102 private: 103 socket_ops::state_type state_; 104 socket_ops::weak_cancel_token_type cancel_token_; 105 MutableBufferSequence buffers_; 106 Handler handler_; 107 }; 108 109 } // namespace detail 110 } // namespace asio 111 } // namespace boost 112 113 #include <boost/asio/detail/pop_options.hpp> 114 115 #endif // defined(BOOST_ASIO_HAS_IOCP) 116 117 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECV_OP_HPP 118