// // 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 ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP #define ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include "asio/detail/config.hpp" #if !defined(ASIO_WINDOWS) && !defined(__CYGWIN__) #include "asio/detail/bind_handler.hpp" #include "asio/detail/buffer_sequence_adapter.hpp" #include "asio/detail/descriptor_ops.hpp" #include "asio/detail/fenced_block.hpp" #include "asio/detail/handler_work.hpp" #include "asio/detail/memory.hpp" #include "asio/detail/reactor_op.hpp" #include "asio/detail/push_options.hpp" namespace asio { namespace detail { template class descriptor_write_op_base : public reactor_op { public: descriptor_write_op_base(const asio::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(base)); typedef buffer_sequence_adapter 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; } ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_write", o->ec_, o->bytes_transferred_)); return result; } private: int descriptor_; ConstBufferSequence buffers_; }; template class descriptor_write_op : public descriptor_write_op_base { public: ASIO_DEFINE_HANDLER_PTR(descriptor_write_op); descriptor_write_op(const asio::error_code& success_ec, int descriptor, const ConstBufferSequence& buffers, Handler& handler, const IoExecutor& io_ex) : descriptor_write_op_base(success_ec, descriptor, buffers, &descriptor_write_op::do_complete), handler_(ASIO_MOVE_CAST(Handler)(handler)), work_(handler_, io_ex) { } static void do_complete(void* owner, operation* base, const asio::error_code& /*ec*/, std::size_t /*bytes_transferred*/) { // Take ownership of the handler object. descriptor_write_op* o(static_cast(base)); ptr p = { asio::detail::addressof(o->handler_), o, o }; ASIO_HANDLER_COMPLETION((*o)); // Take ownership of the operation's outstanding work. handler_work w( ASIO_MOVE_CAST2(handler_work)( 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(o->handler_, o->ec_, o->bytes_transferred_); p.h = asio::detail::addressof(handler.handler_); p.reset(); // Make the upcall if required. if (owner) { fenced_block b(fenced_block::half); ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); w.complete(handler, handler.handler_); ASIO_HANDLER_INVOCATION_END; } } private: Handler handler_; handler_work work_; }; } // namespace detail } // namespace asio #include "asio/detail/pop_options.hpp" #endif // !defined(ASIO_WINDOWS) && !defined(__CYGWIN__) #endif // ASIO_DETAIL_DESCRIPTOR_WRITE_OP_HPP