| // |
| // detail/descriptor_write_op.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #ifndef BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP |
| #define BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/config.hpp> |
| |
| #if !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__) |
| |
| #include <boost/asio/detail/bind_handler.hpp> |
| #include <boost/asio/detail/buffer_sequence_adapter.hpp> |
| #include <boost/asio/detail/descriptor_ops.hpp> |
| #include <boost/asio/detail/fenced_block.hpp> |
| #include <boost/asio/detail/handler_work.hpp> |
| #include <boost/asio/detail/memory.hpp> |
| #include <boost/asio/detail/reactor_op.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace detail { |
| |
| template <typename ConstBufferSequence> |
| class descriptor_write_op_base : public reactor_op |
| { |
| public: |
| descriptor_write_op_base(const boost::system::error_code& success_ec, |
| int descriptor, const ConstBufferSequence& buffers, |
| func_type complete_func) |
| : reactor_op(success_ec, |
| &descriptor_write_op_base::do_perform, complete_func), |
| descriptor_(descriptor), |
| buffers_(buffers) |
| { |
| } |
| |
| static status do_perform(reactor_op* base) |
| { |
| descriptor_write_op_base* o(static_cast<descriptor_write_op_base*>(base)); |
| |
| typedef buffer_sequence_adapter<boost::asio::const_buffer, |
| ConstBufferSequence> bufs_type; |
| |
| status result; |
| if (bufs_type::is_single_buffer) |
| { |
| result = descriptor_ops::non_blocking_write1(o->descriptor_, |
| bufs_type::first(o->buffers_).data(), |
| bufs_type::first(o->buffers_).size(), |
| o->ec_, o->bytes_transferred_) ? done : not_done; |
| } |
| else |
| { |
| bufs_type bufs(o->buffers_); |
| result = descriptor_ops::non_blocking_write(o->descriptor_, |
| bufs.buffers(), bufs.count(), o->ec_, o->bytes_transferred_) |
| ? done : not_done; |
| } |
| |
| BOOST_ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_write", |
| o->ec_, o->bytes_transferred_)); |
| |
| return result; |
| } |
| |
| private: |
| int descriptor_; |
| ConstBufferSequence buffers_; |
| }; |
| |
| template <typename ConstBufferSequence, typename Handler, typename IoExecutor> |
| class descriptor_write_op |
| : public descriptor_write_op_base<ConstBufferSequence> |
| { |
| public: |
| BOOST_ASIO_DEFINE_HANDLER_PTR(descriptor_write_op); |
| |
| descriptor_write_op(const boost::system::error_code& success_ec, |
| int descriptor, const ConstBufferSequence& buffers, |
| Handler& handler, const IoExecutor& io_ex) |
| : descriptor_write_op_base<ConstBufferSequence>(success_ec, |
| descriptor, buffers, &descriptor_write_op::do_complete), |
| handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)), |
| work_(handler_, io_ex) |
| { |
| } |
| |
| static void do_complete(void* owner, operation* base, |
| const boost::system::error_code& /*ec*/, |
| std::size_t /*bytes_transferred*/) |
| { |
| // Take ownership of the handler object. |
| descriptor_write_op* o(static_cast<descriptor_write_op*>(base)); |
| ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; |
| |
| BOOST_ASIO_HANDLER_COMPLETION((*o)); |
| |
| // Take ownership of the operation's outstanding work. |
| handler_work<Handler, IoExecutor> w( |
| BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)( |
| o->work_)); |
| |
| // Make a copy of the handler so that the memory can be deallocated before |
| // the upcall is made. Even if we're not about to make an upcall, a |
| // sub-object of the handler may be the true owner of the memory associated |
| // with the handler. Consequently, a local copy of the handler is required |
| // to ensure that any owning sub-object remains valid until after we have |
| // deallocated the memory here. |
| detail::binder2<Handler, boost::system::error_code, std::size_t> |
| handler(o->handler_, o->ec_, o->bytes_transferred_); |
| p.h = boost::asio::detail::addressof(handler.handler_); |
| p.reset(); |
| |
| // Make the upcall if required. |
| if (owner) |
| { |
| fenced_block b(fenced_block::half); |
| BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); |
| w.complete(handler, handler.handler_); |
| BOOST_ASIO_HANDLER_INVOCATION_END; |
| } |
| } |
| |
| private: |
| Handler handler_; |
| handler_work<Handler, IoExecutor> work_; |
| }; |
| |
| } // namespace detail |
| } // namespace asio |
| } // namespace boost |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__) |
| |
| #endif // BOOST_ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP |