Home | History | Annotate | Download | only in detail 
      1 //
      2 // detail/reactive_socket_sendto_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_SENDTO_OP_HPP
     12 #define ASIO_DETAIL_REACTIVE_SOCKET_SENDTO_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 ConstBufferSequence, typename Endpoint>
     29 class reactive_socket_sendto_op_base : public reactor_op
     30 {
     31 public:
     32   reactive_socket_sendto_op_base(socket_type socket,
     33       const ConstBufferSequence& buffers, const Endpoint& endpoint,
     34       socket_base::message_flags flags, func_type complete_func)
     35     : reactor_op(&reactive_socket_sendto_op_base::do_perform, complete_func),
     36       socket_(socket),
     37       buffers_(buffers),
     38       destination_(endpoint),
     39       flags_(flags)
     40   {
     41   }
     42 
     43   static bool do_perform(reactor_op* base)
     44   {
     45     reactive_socket_sendto_op_base* o(
     46         static_cast<reactive_socket_sendto_op_base*>(base));
     47 
     48     buffer_sequence_adapter<asio::const_buffer,
     49         ConstBufferSequence> bufs(o->buffers_);
     50 
     51     return socket_ops::non_blocking_sendto(o->socket_,
     52           bufs.buffers(), bufs.count(), o->flags_,
     53           o->destination_.data(), o->destination_.size(),
     54           o->ec_, o->bytes_transferred_);
     55   }
     56 
     57 private:
     58   socket_type socket_;
     59   ConstBufferSequence buffers_;
     60   Endpoint destination_;
     61   socket_base::message_flags flags_;
     62 };
     63 
     64 template <typename ConstBufferSequence, typename Endpoint, typename Handler>
     65 class reactive_socket_sendto_op :
     66   public reactive_socket_sendto_op_base<ConstBufferSequence, Endpoint>
     67 {
     68 public:
     69   ASIO_DEFINE_HANDLER_PTR(reactive_socket_sendto_op);
     70 
     71   reactive_socket_sendto_op(socket_type socket,
     72       const ConstBufferSequence& buffers, const Endpoint& endpoint,
     73       socket_base::message_flags flags, Handler& handler)
     74     : reactive_socket_sendto_op_base<ConstBufferSequence, Endpoint>(socket,
     75         buffers, endpoint, flags, &reactive_socket_sendto_op::do_complete),
     76       handler_(ASIO_MOVE_CAST(Handler)(handler))
     77   {
     78   }
     79 
     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_sendto_op* o(static_cast<reactive_socket_sendto_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_SENDTO_OP_HPP
    121