1 // 2 // detail/reactive_socket_recv_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_RECV_OP_HPP 12 #define ASIO_DETAIL_REACTIVE_SOCKET_RECV_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> 29 class reactive_socket_recv_op_base : public reactor_op 30 { 31 public: reactive_socket_recv_op_base(socket_type socket,socket_ops::state_type state,const MutableBufferSequence & buffers,socket_base::message_flags flags,func_type complete_func)32 reactive_socket_recv_op_base(socket_type socket, 33 socket_ops::state_type state, const MutableBufferSequence& buffers, 34 socket_base::message_flags flags, func_type complete_func) 35 : reactor_op(&reactive_socket_recv_op_base::do_perform, complete_func), 36 socket_(socket), 37 state_(state), 38 buffers_(buffers), 39 flags_(flags) 40 { 41 } 42 do_perform(reactor_op * base)43 static bool do_perform(reactor_op* base) 44 { 45 reactive_socket_recv_op_base* o( 46 static_cast<reactive_socket_recv_op_base*>(base)); 47 48 buffer_sequence_adapter<asio::mutable_buffer, 49 MutableBufferSequence> bufs(o->buffers_); 50 51 return socket_ops::non_blocking_recv(o->socket_, 52 bufs.buffers(), bufs.count(), o->flags_, 53 (o->state_ & socket_ops::stream_oriented) != 0, 54 o->ec_, o->bytes_transferred_); 55 } 56 57 private: 58 socket_type socket_; 59 socket_ops::state_type state_; 60 MutableBufferSequence buffers_; 61 socket_base::message_flags flags_; 62 }; 63 64 template <typename MutableBufferSequence, typename Handler> 65 class reactive_socket_recv_op : 66 public reactive_socket_recv_op_base<MutableBufferSequence> 67 { 68 public: 69 ASIO_DEFINE_HANDLER_PTR(reactive_socket_recv_op); 70 reactive_socket_recv_op(socket_type socket,socket_ops::state_type state,const MutableBufferSequence & buffers,socket_base::message_flags flags,Handler & handler)71 reactive_socket_recv_op(socket_type socket, 72 socket_ops::state_type state, const MutableBufferSequence& buffers, 73 socket_base::message_flags flags, Handler& handler) 74 : reactive_socket_recv_op_base<MutableBufferSequence>(socket, state, 75 buffers, flags, &reactive_socket_recv_op::do_complete), 76 handler_(ASIO_MOVE_CAST(Handler)(handler)) 77 { 78 } 79 do_complete(io_service_impl * owner,operation * base,const asio::error_code &,std::size_t)80 static void do_complete(io_service_impl* owner, operation* base, 81 const asio::error_code& /*ec*/, 82 std::size_t /*bytes_transferred*/) 83 { 84 // Take ownership of the handler object. 85 reactive_socket_recv_op* o(static_cast<reactive_socket_recv_op*>(base)); 86 ptr p = { asio::detail::addressof(o->handler_), o, o }; 87 88 ASIO_HANDLER_COMPLETION((o)); 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, asio::error_code, std::size_t> 97 handler(o->handler_, o->ec_, o->bytes_transferred_); 98 p.h = 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 ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 106 asio_handler_invoke_helpers::invoke(handler, handler.handler_); 107 ASIO_HANDLER_INVOCATION_END; 108 } 109 } 110 111 private: 112 Handler handler_; 113 }; 114 115 } // namespace detail 116 } // namespace asio 117 118 #include "asio/detail/pop_options.hpp" 119 120 #endif // ASIO_DETAIL_REACTIVE_SOCKET_RECV_OP_HPP 121