1 // 2 // detail/reactive_socket_recvfrom_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 ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP 12 #define ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP 13 14 15 #include "asio/detail/config.hpp" 16 #include "asio/detail/addressof.hpp" 17 #include "asio/detail/bind_handler.hpp" 18 #include "asio/detail/buffer_sequence_adapter.hpp" 19 #include "asio/detail/fenced_block.hpp" 20 #include "asio/detail/reactor_op.hpp" 21 #include "asio/detail/socket_ops.hpp" 22 23 #include "asio/detail/push_options.hpp" 24 25 namespace asio { 26 namespace detail { 27 28 template <typename MutableBufferSequence, typename Endpoint> 29 class reactive_socket_recvfrom_op_base : public reactor_op 30 { 31 public: reactive_socket_recvfrom_op_base(socket_type socket,int protocol_type,const MutableBufferSequence & buffers,Endpoint & endpoint,socket_base::message_flags flags,func_type complete_func)32 reactive_socket_recvfrom_op_base(socket_type socket, int protocol_type, 33 const MutableBufferSequence& buffers, Endpoint& endpoint, 34 socket_base::message_flags flags, func_type complete_func) 35 : reactor_op(&reactive_socket_recvfrom_op_base::do_perform, complete_func), 36 socket_(socket), 37 protocol_type_(protocol_type), 38 buffers_(buffers), 39 sender_endpoint_(endpoint), 40 flags_(flags) 41 { 42 } 43 do_perform(reactor_op * base)44 static bool do_perform(reactor_op* base) 45 { 46 reactive_socket_recvfrom_op_base* o( 47 static_cast<reactive_socket_recvfrom_op_base*>(base)); 48 49 buffer_sequence_adapter<asio::mutable_buffer, 50 MutableBufferSequence> bufs(o->buffers_); 51 52 std::size_t addr_len = o->sender_endpoint_.capacity(); 53 bool result = socket_ops::non_blocking_recvfrom(o->socket_, 54 bufs.buffers(), bufs.count(), o->flags_, 55 o->sender_endpoint_.data(), &addr_len, 56 o->ec_, o->bytes_transferred_); 57 58 if (result && !o->ec_) 59 o->sender_endpoint_.resize(addr_len); 60 61 return result; 62 } 63 64 private: 65 socket_type socket_; 66 int protocol_type_; 67 MutableBufferSequence buffers_; 68 Endpoint& sender_endpoint_; 69 socket_base::message_flags flags_; 70 }; 71 72 template <typename MutableBufferSequence, typename Endpoint, typename Handler> 73 class reactive_socket_recvfrom_op : 74 public reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint> 75 { 76 public: 77 ASIO_DEFINE_HANDLER_PTR(reactive_socket_recvfrom_op); 78 reactive_socket_recvfrom_op(socket_type socket,int protocol_type,const MutableBufferSequence & buffers,Endpoint & endpoint,socket_base::message_flags flags,Handler & handler)79 reactive_socket_recvfrom_op(socket_type socket, int protocol_type, 80 const MutableBufferSequence& buffers, Endpoint& endpoint, 81 socket_base::message_flags flags, Handler& handler) 82 : reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>( 83 socket, protocol_type, buffers, endpoint, flags, 84 &reactive_socket_recvfrom_op::do_complete), 85 handler_(ASIO_MOVE_CAST(Handler)(handler)) 86 { 87 } 88 do_complete(io_service_impl * owner,operation * base,const asio::error_code &,std::size_t)89 static void do_complete(io_service_impl* owner, operation* base, 90 const asio::error_code& /*ec*/, 91 std::size_t /*bytes_transferred*/) 92 { 93 // Take ownership of the handler object. 94 reactive_socket_recvfrom_op* o( 95 static_cast<reactive_socket_recvfrom_op*>(base)); 96 ptr p = { asio::detail::addressof(o->handler_), o, o }; 97 98 ASIO_HANDLER_COMPLETION((o)); 99 100 // Make a copy of the handler so that the memory can be deallocated before 101 // the upcall is made. Even if we're not about to make an upcall, a 102 // sub-object of the handler may be the true owner of the memory associated 103 // with the handler. Consequently, a local copy of the handler is required 104 // to ensure that any owning sub-object remains valid until after we have 105 // deallocated the memory here. 106 detail::binder2<Handler, asio::error_code, std::size_t> 107 handler(o->handler_, o->ec_, o->bytes_transferred_); 108 p.h = asio::detail::addressof(handler.handler_); 109 p.reset(); 110 111 // Make the upcall if required. 112 if (owner) 113 { 114 fenced_block b(fenced_block::half); 115 ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 116 asio_handler_invoke_helpers::invoke(handler, handler.handler_); 117 ASIO_HANDLER_INVOCATION_END; 118 } 119 } 120 121 private: 122 Handler handler_; 123 }; 124 125 } // namespace detail 126 } // namespace asio 127 128 #include "asio/detail/pop_options.hpp" 129 130 #endif // ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP 131