1 // 2 // detail/win_iocp_null_buffers_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_NULL_BUFFERS_OP_HPP 12 #define BOOST_ASIO_DETAIL_WIN_IOCP_NULL_BUFFERS_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/fenced_block.hpp> 24 #include <boost/asio/detail/handler_alloc_helpers.hpp> 25 #include <boost/asio/detail/handler_invoke_helpers.hpp> 26 #include <boost/asio/detail/handler_work.hpp> 27 #include <boost/asio/detail/memory.hpp> 28 #include <boost/asio/detail/reactor_op.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 Handler, typename IoExecutor> 39 class win_iocp_null_buffers_op : public reactor_op 40 { 41 public: 42 BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_null_buffers_op); 43 win_iocp_null_buffers_op(socket_ops::weak_cancel_token_type cancel_token,Handler & handler,const IoExecutor & io_ex)44 win_iocp_null_buffers_op(socket_ops::weak_cancel_token_type cancel_token, 45 Handler& handler, const IoExecutor& io_ex) 46 : reactor_op(boost::system::error_code(), 47 &win_iocp_null_buffers_op::do_perform, 48 &win_iocp_null_buffers_op::do_complete), 49 cancel_token_(cancel_token), 50 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)), 51 work_(handler_, io_ex) 52 { 53 } 54 do_perform(reactor_op *)55 static status do_perform(reactor_op*) 56 { 57 return done; 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_null_buffers_op* o(static_cast<win_iocp_null_buffers_op*>(base)); 68 ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; 69 70 BOOST_ASIO_HANDLER_COMPLETION((*o)); 71 72 // Take ownership of the operation's outstanding work. 73 handler_work<Handler, IoExecutor> w( 74 BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)( 75 o->work_)); 76 77 // The reactor may have stored a result in the operation object. 78 if (o->ec_) 79 ec = o->ec_; 80 81 // Map non-portable errors to their portable counterparts. 82 if (ec.value() == ERROR_NETNAME_DELETED) 83 { 84 if (o->cancel_token_.expired()) 85 ec = boost::asio::error::operation_aborted; 86 else 87 ec = boost::asio::error::connection_reset; 88 } 89 else if (ec.value() == ERROR_PORT_UNREACHABLE) 90 { 91 ec = boost::asio::error::connection_refused; 92 } 93 94 // Make a copy of the handler so that the memory can be deallocated before 95 // the upcall is made. Even if we're not about to make an upcall, a 96 // sub-object of the handler may be the true owner of the memory associated 97 // with the handler. Consequently, a local copy of the handler is required 98 // to ensure that any owning sub-object remains valid until after we have 99 // deallocated the memory here. 100 detail::binder2<Handler, boost::system::error_code, std::size_t> 101 handler(o->handler_, ec, bytes_transferred); 102 p.h = boost::asio::detail::addressof(handler.handler_); 103 p.reset(); 104 105 // Make the upcall if required. 106 if (owner) 107 { 108 fenced_block b(fenced_block::half); 109 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 110 w.complete(handler, handler.handler_); 111 BOOST_ASIO_HANDLER_INVOCATION_END; 112 } 113 } 114 115 private: 116 socket_ops::weak_cancel_token_type cancel_token_; 117 Handler handler_; 118 handler_work<Handler, IoExecutor> work_; 119 }; 120 121 } // namespace detail 122 } // namespace asio 123 } // namespace boost 124 125 #include <boost/asio/detail/pop_options.hpp> 126 127 #endif // defined(BOOST_ASIO_HAS_IOCP) 128 129 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_NULL_BUFFERS_OP_HPP 130