1 // 2 // detail/descriptor_write_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 BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP 12 #define BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_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_WINDOWS) && !defined(__CYGWIN__) 21 22 #include <boost/asio/detail/addressof.hpp> 23 #include <boost/asio/detail/bind_handler.hpp> 24 #include <boost/asio/detail/buffer_sequence_adapter.hpp> 25 #include <boost/asio/detail/descriptor_ops.hpp> 26 #include <boost/asio/detail/fenced_block.hpp> 27 #include <boost/asio/detail/reactor_op.hpp> 28 29 #include <boost/asio/detail/push_options.hpp> 30 31 namespace boost { 32 namespace asio { 33 namespace detail { 34 35 template <typename ConstBufferSequence> 36 class descriptor_write_op_base : public reactor_op 37 { 38 public: descriptor_write_op_base(int descriptor,const ConstBufferSequence & buffers,func_type complete_func)39 descriptor_write_op_base(int descriptor, 40 const ConstBufferSequence& buffers, func_type complete_func) 41 : reactor_op(&descriptor_write_op_base::do_perform, complete_func), 42 descriptor_(descriptor), 43 buffers_(buffers) 44 { 45 } 46 do_perform(reactor_op * base)47 static bool do_perform(reactor_op* base) 48 { 49 descriptor_write_op_base* o(static_cast<descriptor_write_op_base*>(base)); 50 51 buffer_sequence_adapter<boost::asio::const_buffer, 52 ConstBufferSequence> bufs(o->buffers_); 53 54 return descriptor_ops::non_blocking_write(o->descriptor_, 55 bufs.buffers(), bufs.count(), o->ec_, o->bytes_transferred_); 56 } 57 58 private: 59 int descriptor_; 60 ConstBufferSequence buffers_; 61 }; 62 63 template <typename ConstBufferSequence, typename Handler> 64 class descriptor_write_op 65 : public descriptor_write_op_base<ConstBufferSequence> 66 { 67 public: 68 BOOST_ASIO_DEFINE_HANDLER_PTR(descriptor_write_op); 69 descriptor_write_op(int descriptor,const ConstBufferSequence & buffers,Handler & handler)70 descriptor_write_op(int descriptor, 71 const ConstBufferSequence& buffers, Handler& handler) 72 : descriptor_write_op_base<ConstBufferSequence>( 73 descriptor, buffers, &descriptor_write_op::do_complete), 74 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)) 75 { 76 } 77 do_complete(io_service_impl * owner,operation * base,const boost::system::error_code &,std::size_t)78 static void do_complete(io_service_impl* owner, operation* base, 79 const boost::system::error_code& /*ec*/, 80 std::size_t /*bytes_transferred*/) 81 { 82 // Take ownership of the handler object. 83 descriptor_write_op* o(static_cast<descriptor_write_op*>(base)); 84 ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; 85 86 BOOST_ASIO_HANDLER_COMPLETION((o)); 87 88 // Make a copy of the handler so that the memory can be deallocated before 89 // the upcall is made. Even if we're not about to make an upcall, a 90 // sub-object of the handler may be the true owner of the memory associated 91 // with the handler. Consequently, a local copy of the handler is required 92 // to ensure that any owning sub-object remains valid until after we have 93 // deallocated the memory here. 94 detail::binder2<Handler, boost::system::error_code, std::size_t> 95 handler(o->handler_, o->ec_, o->bytes_transferred_); 96 p.h = boost::asio::detail::addressof(handler.handler_); 97 p.reset(); 98 99 // Make the upcall if required. 100 if (owner) 101 { 102 fenced_block b(fenced_block::half); 103 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 104 boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_); 105 BOOST_ASIO_HANDLER_INVOCATION_END; 106 } 107 } 108 109 private: 110 Handler handler_; 111 }; 112 113 } // namespace detail 114 } // namespace asio 115 } // namespace boost 116 117 #include <boost/asio/detail/pop_options.hpp> 118 119 #endif // !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__) 120 121 #endif // BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP 122