asio/detail/win_iocp_handle_read_op.hpp

0001 //
0002 // detail/win_iocp_handle_read_op.hpp
0003 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 // Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
0007 //
0008 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0009 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011
0012 #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_READ_OP_HPP
0013 #define BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_READ_OP_HPP
0014
0015 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0016 # pragma once
0017 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0018
0019 #include <boost/asio/detail/config.hpp>
0020
0021 #if defined(BOOST_ASIO_HAS_IOCP)
0022
0023 #include <boost/asio/detail/bind_handler.hpp>
0024 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
0025 #include <boost/asio/detail/fenced_block.hpp>
0026 #include <boost/asio/detail/handler_alloc_helpers.hpp>
0027 #include <boost/asio/detail/handler_work.hpp>
0028 #include <boost/asio/detail/memory.hpp>
0029 #include <boost/asio/detail/operation.hpp>
0030 #include <boost/asio/error.hpp>
0031
0032 #include <boost/asio/detail/push_options.hpp>
0033
0034 namespace boost {
0035 namespace asio {
0036 namespace detail {
0037
0038 template <typename MutableBufferSequence, typename Handler, typename IoExecutor>
0039 class win_iocp_handle_read_op : public operation
0040 {
0041 public:
0042   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_handle_read_op);
0043
0044   win_iocp_handle_read_op(const MutableBufferSequence& buffers,
0045       Handler& handler, const IoExecutor& io_ex)
0046     : operation(&win_iocp_handle_read_op::do_complete),
0047       buffers_(buffers),
0048       handler_(static_cast<Handler&&>(handler)),
0049       work_(handler_, io_ex)
0050   {
0051   }
0052
0053   static void do_complete(void* owner, operation* base,
0054       const boost::system::error_code& result_ec,
0055       std::size_t bytes_transferred)
0056   {
0057     boost::system::error_code ec(result_ec);
0058
0059     // Take ownership of the operation object.
0060     BOOST_ASIO_ASSUME(base != 0);
0061     win_iocp_handle_read_op* o(static_cast<win_iocp_handle_read_op*>(base));
0062     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
0063
0064     BOOST_ASIO_HANDLER_COMPLETION((*o));
0065
0066     // Take ownership of the operation's outstanding work.
0067     handler_work<Handler, IoExecutor> w(
0068         static_cast<handler_work<Handler, IoExecutor>&&>(
0069           o->work_));
0070
0071 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
0072     if (owner)
0073     {
0074       // Check whether buffers are still valid.
0075       buffer_sequence_adapter<boost::asio::mutable_buffer,
0076           MutableBufferSequence>::validate(o->buffers_);
0077     }
0078 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
0079
0080     // Map non-portable errors to their portable counterparts.
0081     if (ec.value() == ERROR_HANDLE_EOF)
0082       ec = boost::asio::error::eof;
0083
0084     BOOST_ASIO_ERROR_LOCATION(ec);
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_, 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> work_;
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_HAS_IOCP)
0120
0121 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_READ_OP_HPP