2 // detail/win_iocp_overlapped_op.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
11 #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_OP_HPP
12 #define BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_OP_HPP
14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
18 #include <boost/asio/detail/config.hpp>
20 #if defined(BOOST_ASIO_HAS_IOCP)
22 #include <boost/asio/detail/bind_handler.hpp>
23 #include <boost/asio/detail/fenced_block.hpp>
24 #include <boost/asio/detail/handler_alloc_helpers.hpp>
25 #include <boost/asio/detail/handler_invoke_helpers.hpp>
26 #include <boost/asio/detail/handler_work.hpp>
27 #include <boost/asio/detail/memory.hpp>
28 #include <boost/asio/detail/operation.hpp>
29 #include <boost/asio/error.hpp>
31 #include <boost/asio/detail/push_options.hpp>
37 template <typename Handler, typename IoExecutor>
38 class win_iocp_overlapped_op : public operation
41 BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_overlapped_op);
43 win_iocp_overlapped_op(Handler& handler, const IoExecutor& io_ex)
44 : operation(&win_iocp_overlapped_op::do_complete),
45 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
46 work_(handler_, io_ex)
50 static void do_complete(void* owner, operation* base,
51 const boost::system::error_code& ec, std::size_t bytes_transferred)
53 // Take ownership of the operation object.
54 win_iocp_overlapped_op* o(static_cast<win_iocp_overlapped_op*>(base));
55 ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
57 BOOST_ASIO_HANDLER_COMPLETION((*o));
59 // Take ownership of the operation's outstanding work.
60 handler_work<Handler, IoExecutor> w(
61 BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
64 // Make a copy of the handler so that the memory can be deallocated before
65 // the upcall is made. Even if we're not about to make an upcall, a
66 // sub-object of the handler may be the true owner of the memory associated
67 // with the handler. Consequently, a local copy of the handler is required
68 // to ensure that any owning sub-object remains valid until after we have
69 // deallocated the memory here.
70 detail::binder2<Handler, boost::system::error_code, std::size_t>
71 handler(o->handler_, ec, bytes_transferred);
72 p.h = boost::asio::detail::addressof(handler.handler_);
75 // Make the upcall if required.
78 fenced_block b(fenced_block::half);
79 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
80 w.complete(handler, handler.handler_);
81 BOOST_ASIO_HANDLER_INVOCATION_END;
87 handler_work<Handler, IoExecutor> work_;
94 #include <boost/asio/detail/pop_options.hpp>
96 #endif // defined(BOOST_ASIO_HAS_IOCP)
98 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_OP_HPP