asio/detail/win_iocp_overlapped_op.hpp

0001 //
0002 // detail/win_iocp_overlapped_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_WIN_IOCP_OVERLAPPED_OP_HPP
0012 #define BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_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_HAS_IOCP)
0021
0022 #include <boost/asio/detail/bind_handler.hpp>
0023 #include <boost/asio/detail/fenced_block.hpp>
0024 #include <boost/asio/detail/handler_alloc_helpers.hpp>
0025 #include <boost/asio/detail/handler_work.hpp>
0026 #include <boost/asio/detail/memory.hpp>
0027 #include <boost/asio/detail/operation.hpp>
0028 #include <boost/asio/error.hpp>
0029
0030 #include <boost/asio/detail/push_options.hpp>
0031
0032 namespace boost {
0033 namespace asio {
0034 namespace detail {
0035
0036 template <typename Handler, typename IoExecutor>
0037 class win_iocp_overlapped_op : public operation
0038 {
0039 public:
0040   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_overlapped_op);
0041
0042   win_iocp_overlapped_op(Handler& handler, const IoExecutor& io_ex)
0043     : operation(&win_iocp_overlapped_op::do_complete),
0044       handler_(static_cast<Handler&&>(handler)),
0045       work_(handler_, io_ex)
0046   {
0047   }
0048
0049   static void do_complete(void* owner, operation* base,
0050       const boost::system::error_code& result_ec, std::size_t bytes_transferred)
0051   {
0052     boost::system::error_code ec(result_ec);
0053
0054     // Take ownership of the operation object.
0055     BOOST_ASIO_ASSUME(base != 0);
0056     win_iocp_overlapped_op* o(static_cast<win_iocp_overlapped_op*>(base));
0057     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
0058
0059     BOOST_ASIO_HANDLER_COMPLETION((*o));
0060
0061     // Take ownership of the operation's outstanding work.
0062     handler_work<Handler, IoExecutor> w(
0063         static_cast<handler_work<Handler, IoExecutor>&&>(
0064           o->work_));
0065
0066     BOOST_ASIO_ERROR_LOCATION(ec);
0067
0068     // Make a copy of the handler so that the memory can be deallocated before
0069     // the upcall is made. Even if we're not about to make an upcall, a
0070     // sub-object of the handler may be the true owner of the memory associated
0071     // with the handler. Consequently, a local copy of the handler is required
0072     // to ensure that any owning sub-object remains valid until after we have
0073     // deallocated the memory here.
0074     detail::binder2<Handler, boost::system::error_code, std::size_t>
0075       handler(o->handler_, ec, bytes_transferred);
0076     p.h = boost::asio::detail::addressof(handler.handler_);
0077     p.reset();
0078
0079     // Make the upcall if required.
0080     if (owner)
0081     {
0082       fenced_block b(fenced_block::half);
0083       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
0084       w.complete(handler, handler.handler_);
0085       BOOST_ASIO_HANDLER_INVOCATION_END;
0086     }
0087   }
0088
0089 private:
0090   Handler handler_;
0091   handler_work<Handler, IoExecutor> work_;
0092 };
0093
0094 } // namespace detail
0095 } // namespace asio
0096 } // namespace boost
0097
0098 #include <boost/asio/detail/pop_options.hpp>
0099
0100 #endif // defined(BOOST_ASIO_HAS_IOCP)
0101
0102 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_OP_HPP