1 //
2 // detail/win_iocp_handle_write_op.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6 // Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.com)
7 //
8 // Distributed under the Boost Software License, Version 1.0. (See accompanying
9 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
10 //
11 
12 #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_WRITE_OP_HPP
13 #define BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_WRITE_OP_HPP
14 
15 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
16 # pragma once
17 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
18 
19 #include <boost/asio/detail/config.hpp>
20 
21 #if defined(BOOST_ASIO_HAS_IOCP)
22 
23 #include <boost/asio/error.hpp>
24 #include <boost/asio/detail/addressof.hpp>
25 #include <boost/asio/detail/bind_handler.hpp>
26 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
27 #include <boost/asio/detail/fenced_block.hpp>
28 #include <boost/asio/detail/handler_alloc_helpers.hpp>
29 #include <boost/asio/detail/handler_invoke_helpers.hpp>
30 #include <boost/asio/detail/operation.hpp>
31 
32 #include <boost/asio/detail/push_options.hpp>
33 
34 namespace boost {
35 namespace asio {
36 namespace detail {
37 
38 template <typename ConstBufferSequence, typename Handler>
39 class win_iocp_handle_write_op : public operation
40 {
41 public:
42   BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_handle_write_op);
43 
win_iocp_handle_write_op(const ConstBufferSequence & buffers,Handler & handler)44   win_iocp_handle_write_op(const ConstBufferSequence& buffers, Handler& handler)
45     : operation(&win_iocp_handle_write_op::do_complete),
46       buffers_(buffers),
47       handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
48   {
49   }
50 
do_complete(io_service_impl * owner,operation * base,const boost::system::error_code & ec,std::size_t bytes_transferred)51   static void do_complete(io_service_impl* owner, operation* base,
52       const boost::system::error_code& ec, std::size_t bytes_transferred)
53   {
54     // Take ownership of the operation object.
55     win_iocp_handle_write_op* o(static_cast<win_iocp_handle_write_op*>(base));
56     ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
57 
58     BOOST_ASIO_HANDLER_COMPLETION((o));
59 
60 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
61     if (owner)
62     {
63       // Check whether buffers are still valid.
64       buffer_sequence_adapter<boost::asio::const_buffer,
65           ConstBufferSequence>::validate(o->buffers_);
66     }
67 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
68 
69     // Make a copy of the handler so that the memory can be deallocated before
70     // the upcall is made. Even if we're not about to make an upcall, a
71     // sub-object of the handler may be the true owner of the memory associated
72     // with the handler. Consequently, a local copy of the handler is required
73     // to ensure that any owning sub-object remains valid until after we have
74     // deallocated the memory here.
75     detail::binder2<Handler, boost::system::error_code, std::size_t>
76       handler(o->handler_, ec, bytes_transferred);
77     p.h = boost::asio::detail::addressof(handler.handler_);
78     p.reset();
79 
80     // Make the upcall if required.
81     if (owner)
82     {
83       fenced_block b(fenced_block::half);
84       BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
85       boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
86       BOOST_ASIO_HANDLER_INVOCATION_END;
87     }
88   }
89 
90 private:
91   ConstBufferSequence buffers_;
92   Handler handler_;
93 };
94 
95 } // namespace detail
96 } // namespace asio
97 } // namespace boost
98 
99 #include <boost/asio/detail/pop_options.hpp>
100 
101 #endif // defined(BOOST_ASIO_HAS_IOCP)
102 
103 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_HANDLE_WRITE_OP_HPP
104