1 // 2 // detail/win_iocp_socket_recv_op.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2019 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/bind_handler.hpp> 23 #include <boost/asio/detail/buffer_sequence_adapter.hpp> 24 #include <boost/asio/detail/fenced_block.hpp> 25 #include <boost/asio/detail/handler_alloc_helpers.hpp> 26 #include <boost/asio/detail/handler_invoke_helpers.hpp> 27 #include <boost/asio/detail/memory.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, typename IoExecutor> 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,const IoExecutor & io_ex)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 const IoExecutor& io_ex) 48 : operation(&win_iocp_socket_recv_op::do_complete), 49 state_(state), 50 cancel_token_(cancel_token), 51 buffers_(buffers), 52 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)), 53 io_executor_(io_ex) 54 { 55 handler_work<Handler, IoExecutor>::start(handler_, io_executor_); 56 } 57 do_complete(void * owner,operation * base,const boost::system::error_code & result_ec,std::size_t bytes_transferred)58 static void do_complete(void* owner, operation* base, 59 const boost::system::error_code& result_ec, 60 std::size_t bytes_transferred) 61 { 62 boost::system::error_code ec(result_ec); 63 64 // Take ownership of the operation object. 65 win_iocp_socket_recv_op* o(static_cast<win_iocp_socket_recv_op*>(base)); 66 ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; 67 handler_work<Handler, IoExecutor> w(o->handler_, o->io_executor_); 68 69 BOOST_ASIO_HANDLER_COMPLETION((*o)); 70 71 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 72 // Check whether buffers are still valid. 73 if (owner) 74 { 75 buffer_sequence_adapter<boost::asio::mutable_buffer, 76 MutableBufferSequence>::validate(o->buffers_); 77 } 78 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 79 80 socket_ops::complete_iocp_recv(o->state_, o->cancel_token_, 81 buffer_sequence_adapter<boost::asio::mutable_buffer, 82 MutableBufferSequence>::all_empty(o->buffers_), 83 ec, bytes_transferred); 84 85 // Make a copy of the handler so that the memory can be deallocated before 86 // the upcall is made. Even if we're not about to make an upcall, a 87 // sub-object of the handler may be the true owner of the memory associated 88 // with the handler. Consequently, a local copy of the handler is required 89 // to ensure that any owning sub-object remains valid until after we have 90 // deallocated the memory here. 91 detail::binder2<Handler, boost::system::error_code, std::size_t> 92 handler(o->handler_, ec, bytes_transferred); 93 p.h = boost::asio::detail::addressof(handler.handler_); 94 p.reset(); 95 96 // Make the upcall if required. 97 if (owner) 98 { 99 fenced_block b(fenced_block::half); 100 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 101 w.complete(handler, handler.handler_); 102 BOOST_ASIO_HANDLER_INVOCATION_END; 103 } 104 } 105 106 private: 107 socket_ops::state_type state_; 108 socket_ops::weak_cancel_token_type cancel_token_; 109 MutableBufferSequence buffers_; 110 Handler handler_; 111 IoExecutor io_executor_; 112 }; 113 114 } // namespace detail 115 } // namespace asio 116 } // namespace boost 117 118 #include <boost/asio/detail/pop_options.hpp> 119 120 #endif // defined(BOOST_ASIO_HAS_IOCP) 121 122 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECV_OP_HPP 123