asio/detail/winrt_socket_recv_op.hpp

0001 //
0002 // detail/winrt_socket_recv_op.hpp
0003 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010
0011 #ifndef BOOST_ASIO_DETAIL_WINRT_SOCKET_RECV_OP_HPP
0012 #define BOOST_ASIO_DETAIL_WINRT_SOCKET_RECV_OP_HPP
0013
0014 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0015 # pragma once
0016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0017
0018 #include <boost/asio/detail/config.hpp>
0019
0020 #if defined(BOOST_ASIO_WINDOWS_RUNTIME)
0021
0022 #include <boost/asio/detail/bind_handler.hpp>
0023 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
0024 #include <boost/asio/detail/fenced_block.hpp>
0025 #include <boost/asio/detail/handler_alloc_helpers.hpp>
0026 #include <boost/asio/detail/handler_work.hpp>
0027 #include <boost/asio/detail/memory.hpp>
0028 #include <boost/asio/detail/winrt_async_op.hpp>
0029 #include <boost/asio/error.hpp>
0030
0031 #include <boost/asio/detail/push_options.hpp>
0032
0033 namespace boost {
0034 namespace asio {
0035 namespace detail {
0036
0037 template <typename MutableBufferSequence, typename Handler, typename IoExecutor>
0038 class winrt_socket_recv_op :
0039   public winrt_async_op<Windows::Storage::Streams::IBuffer^>
0040 {
0041 public:
0042   BOOST_ASIO_DEFINE_HANDLER_PTR(winrt_socket_recv_op);
0043
0044   winrt_socket_recv_op(const MutableBufferSequence& buffers,
0045       Handler& handler, const IoExecutor& io_ex)
0046     : winrt_async_op<Windows::Storage::Streams::IBuffer^>(
0047           &winrt_socket_recv_op::do_complete),
0048       buffers_(buffers),
0049       handler_(static_cast<Handler&&>(handler)),
0050       work_(handler_, io_ex)
0051   {
0052   }
0053
0054   static void do_complete(void* owner, operation* base,
0055       const boost::system::error_code&, std::size_t)
0056   {
0057     // Take ownership of the operation object.
0058     BOOST_ASIO_ASSUME(base != 0);
0059     winrt_socket_recv_op* o(static_cast<winrt_socket_recv_op*>(base));
0060     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
0061
0062     BOOST_ASIO_HANDLER_COMPLETION((*o));
0063
0064     // Take ownership of the operation's outstanding work.
0065     handler_work<Handler, IoExecutor> w(
0066         static_cast<handler_work<Handler, IoExecutor>&&>(
0067           o->work_));
0068
0069 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
0070     // Check whether buffers are still valid.
0071     if (owner)
0072     {
0073       buffer_sequence_adapter<boost::asio::mutable_buffer,
0074           MutableBufferSequence>::validate(o->buffers_);
0075     }
0076 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
0077
0078     std::size_t bytes_transferred = o->result_ ? o->result_->Length : 0;
0079     if (bytes_transferred == 0 && !o->ec_ &&
0080         !buffer_sequence_adapter<boost::asio::mutable_buffer,
0081           MutableBufferSequence>::all_empty(o->buffers_))
0082     {
0083       o->ec_ = boost::asio::error::eof;
0084     }
0085
0086     // Make a copy of the handler so that the memory can be deallocated before
0087     // the upcall is made. Even if we're not about to make an upcall, a
0088     // sub-object of the handler may be the true owner of the memory associated
0089     // with the handler. Consequently, a local copy of the handler is required
0090     // to ensure that any owning sub-object remains valid until after we have
0091     // deallocated the memory here.
0092     detail::binder2<Handler, boost::system::error_code, std::size_t>
0093       handler(o->handler_, o->ec_, bytes_transferred);
0094     p.h = boost::asio::detail::addressof(handler.handler_);
0095     p.reset();
0096
0097     // Make the upcall if required.
0098     if (owner)
0099     {
0100       fenced_block b(fenced_block::half);
0101       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
0102       w.complete(handler, handler.handler_);
0103       BOOST_ASIO_HANDLER_INVOCATION_END;
0104     }
0105   }
0106
0107 private:
0108   MutableBufferSequence buffers_;
0109   Handler handler_;
0110   handler_work<Handler, IoExecutor> executor_;
0111 };
0112
0113 } // namespace detail
0114 } // namespace asio
0115 } // namespace boost
0116
0117 #include <boost/asio/detail/pop_options.hpp>
0118
0119 #endif // defined(BOOST_ASIO_WINDOWS_RUNTIME)
0120
0121 #endif // BOOST_ASIO_DETAIL_WINRT_SOCKET_RECV_OP_HPP