1 // 2 // detail/win_iocp_socket_recvmsg_op.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2021 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_RECVMSG_OP_HPP 12 #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVMSG_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/handler_work.hpp> 28 #include <boost/asio/detail/memory.hpp> 29 #include <boost/asio/detail/operation.hpp> 30 #include <boost/asio/detail/socket_ops.hpp> 31 #include <boost/asio/error.hpp> 32 #include <boost/asio/socket_base.hpp> 33 34 #include <boost/asio/detail/push_options.hpp> 35 36 namespace boost { 37 namespace asio { 38 namespace detail { 39 40 template <typename MutableBufferSequence, typename Handler, typename IoExecutor> 41 class win_iocp_socket_recvmsg_op : public operation 42 { 43 public: 44 BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvmsg_op); 45 win_iocp_socket_recvmsg_op(socket_ops::weak_cancel_token_type cancel_token,const MutableBufferSequence & buffers,socket_base::message_flags & out_flags,Handler & handler,const IoExecutor & io_ex)46 win_iocp_socket_recvmsg_op( 47 socket_ops::weak_cancel_token_type cancel_token, 48 const MutableBufferSequence& buffers, 49 socket_base::message_flags& out_flags, 50 Handler& handler, const IoExecutor& io_ex) 51 : operation(&win_iocp_socket_recvmsg_op::do_complete), 52 cancel_token_(cancel_token), 53 buffers_(buffers), 54 out_flags_(out_flags), 55 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)), 56 work_(handler_, io_ex) 57 { 58 } 59 do_complete(void * owner,operation * base,const boost::system::error_code & result_ec,std::size_t bytes_transferred)60 static void do_complete(void* owner, operation* base, 61 const boost::system::error_code& result_ec, 62 std::size_t bytes_transferred) 63 { 64 boost::system::error_code ec(result_ec); 65 66 // Take ownership of the operation object. 67 win_iocp_socket_recvmsg_op* o( 68 static_cast<win_iocp_socket_recvmsg_op*>(base)); 69 ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; 70 71 BOOST_ASIO_HANDLER_COMPLETION((*o)); 72 73 // Take ownership of the operation's outstanding work. 74 handler_work<Handler, IoExecutor> w( 75 BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)( 76 o->work_)); 77 78 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 79 // Check whether buffers are still valid. 80 if (owner) 81 { 82 buffer_sequence_adapter<boost::asio::mutable_buffer, 83 MutableBufferSequence>::validate(o->buffers_); 84 } 85 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 86 87 socket_ops::complete_iocp_recvmsg(o->cancel_token_, ec); 88 o->out_flags_ = 0; 89 90 // Make a copy of the handler so that the memory can be deallocated before 91 // the upcall is made. Even if we're not about to make an upcall, a 92 // sub-object of the handler may be the true owner of the memory associated 93 // with the handler. Consequently, a local copy of the handler is required 94 // to ensure that any owning sub-object remains valid until after we have 95 // deallocated the memory here. 96 detail::binder2<Handler, boost::system::error_code, std::size_t> 97 handler(o->handler_, ec, bytes_transferred); 98 p.h = boost::asio::detail::addressof(handler.handler_); 99 p.reset(); 100 101 // Make the upcall if required. 102 if (owner) 103 { 104 fenced_block b(fenced_block::half); 105 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 106 w.complete(handler, handler.handler_); 107 BOOST_ASIO_HANDLER_INVOCATION_END; 108 } 109 } 110 111 private: 112 socket_ops::weak_cancel_token_type cancel_token_; 113 MutableBufferSequence buffers_; 114 socket_base::message_flags& out_flags_; 115 Handler handler_; 116 handler_work<Handler, IoExecutor> work_; 117 }; 118 119 } // namespace detail 120 } // namespace asio 121 } // namespace boost 122 123 #include <boost/asio/detail/pop_options.hpp> 124 125 #endif // defined(BOOST_ASIO_HAS_IOCP) 126 127 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVMSG_OP_HPP 128