1 // 2 // detail/win_iocp_socket_recvfrom_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_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/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 33 #include <boost/asio/detail/push_options.hpp> 34 35 namespace boost { 36 namespace asio { 37 namespace detail { 38 39 template <typename MutableBufferSequence, typename Endpoint, 40 typename Handler, typename IoExecutor> 41 class win_iocp_socket_recvfrom_op : public operation 42 { 43 public: 44 BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvfrom_op); 45 win_iocp_socket_recvfrom_op(Endpoint & endpoint,socket_ops::weak_cancel_token_type cancel_token,const MutableBufferSequence & buffers,Handler & handler,const IoExecutor & io_ex)46 win_iocp_socket_recvfrom_op(Endpoint& endpoint, 47 socket_ops::weak_cancel_token_type cancel_token, 48 const MutableBufferSequence& buffers, Handler& handler, 49 const IoExecutor& io_ex) 50 : operation(&win_iocp_socket_recvfrom_op::do_complete), 51 endpoint_(endpoint), 52 endpoint_size_(static_cast<int>(endpoint.capacity())), 53 cancel_token_(cancel_token), 54 buffers_(buffers), 55 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)), 56 work_(handler_, io_ex) 57 { 58 } 59 endpoint_size()60 int& endpoint_size() 61 { 62 return endpoint_size_; 63 } 64 do_complete(void * owner,operation * base,const boost::system::error_code & result_ec,std::size_t bytes_transferred)65 static void do_complete(void* owner, operation* base, 66 const boost::system::error_code& result_ec, 67 std::size_t bytes_transferred) 68 { 69 boost::system::error_code ec(result_ec); 70 71 // Take ownership of the operation object. 72 win_iocp_socket_recvfrom_op* o( 73 static_cast<win_iocp_socket_recvfrom_op*>(base)); 74 ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; 75 76 BOOST_ASIO_HANDLER_COMPLETION((*o)); 77 78 // Take ownership of the operation's outstanding work. 79 handler_work<Handler, IoExecutor> w( 80 BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)( 81 o->work_)); 82 83 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 84 // Check whether buffers are still valid. 85 if (owner) 86 { 87 buffer_sequence_adapter<boost::asio::mutable_buffer, 88 MutableBufferSequence>::validate(o->buffers_); 89 } 90 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 91 92 socket_ops::complete_iocp_recvfrom(o->cancel_token_, ec); 93 94 // Record the size of the endpoint returned by the operation. 95 o->endpoint_.resize(o->endpoint_size_); 96 97 // Make a copy of the handler so that the memory can be deallocated before 98 // the upcall is made. Even if we're not about to make an upcall, a 99 // sub-object of the handler may be the true owner of the memory associated 100 // with the handler. Consequently, a local copy of the handler is required 101 // to ensure that any owning sub-object remains valid until after we have 102 // deallocated the memory here. 103 detail::binder2<Handler, boost::system::error_code, std::size_t> 104 handler(o->handler_, ec, bytes_transferred); 105 p.h = boost::asio::detail::addressof(handler.handler_); 106 p.reset(); 107 108 // Make the upcall if required. 109 if (owner) 110 { 111 fenced_block b(fenced_block::half); 112 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 113 w.complete(handler, handler.handler_); 114 BOOST_ASIO_HANDLER_INVOCATION_END; 115 } 116 } 117 118 private: 119 Endpoint& endpoint_; 120 int endpoint_size_; 121 socket_ops::weak_cancel_token_type cancel_token_; 122 MutableBufferSequence buffers_; 123 Handler handler_; 124 handler_work<Handler, IoExecutor> work_; 125 }; 126 127 } // namespace detail 128 } // namespace asio 129 } // namespace boost 130 131 #include <boost/asio/detail/pop_options.hpp> 132 133 #endif // defined(BOOST_ASIO_HAS_IOCP) 134 135 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP 136