1 //
2 // detail/win_iocp_operation.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6 //
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)
9 //
10 
11 #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
12 #define BOOST_ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
13 
14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
15 # pragma once
16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17 
18 #include <boost/asio/detail/config.hpp>
19 
20 #if defined(BOOST_ASIO_HAS_IOCP)
21 
22 #include <boost/asio/detail/handler_tracking.hpp>
23 #include <boost/asio/detail/op_queue.hpp>
24 #include <boost/asio/detail/socket_types.hpp>
25 #include <boost/system/error_code.hpp>
26 
27 #include <boost/asio/detail/push_options.hpp>
28 
29 namespace boost {
30 namespace asio {
31 namespace detail {
32 
33 class win_iocp_io_context;
34 
35 // Base class for all operations. A function pointer is used instead of virtual
36 // functions to avoid the associated overhead.
37 class win_iocp_operation
38   : public OVERLAPPED
39     BOOST_ASIO_ALSO_INHERIT_TRACKED_HANDLER
40 {
41 public:
42   typedef win_iocp_operation operation_type;
43 
complete(void * owner,const boost::system::error_code & ec,std::size_t bytes_transferred)44   void complete(void* owner, const boost::system::error_code& ec,
45       std::size_t bytes_transferred)
46   {
47     func_(owner, this, ec, bytes_transferred);
48   }
49 
destroy()50   void destroy()
51   {
52     func_(0, this, boost::system::error_code(), 0);
53   }
54 
55 protected:
56   typedef void (*func_type)(
57       void*, win_iocp_operation*,
58       const boost::system::error_code&, std::size_t);
59 
win_iocp_operation(func_type func)60   win_iocp_operation(func_type func)
61     : next_(0),
62       func_(func)
63   {
64     reset();
65   }
66 
67   // Prevents deletion through this type.
~win_iocp_operation()68   ~win_iocp_operation()
69   {
70   }
71 
reset()72   void reset()
73   {
74     Internal = 0;
75     InternalHigh = 0;
76     Offset = 0;
77     OffsetHigh = 0;
78     hEvent = 0;
79     ready_ = 0;
80   }
81 
82 private:
83   friend class op_queue_access;
84   friend class win_iocp_io_context;
85   win_iocp_operation* next_;
86   func_type func_;
87   long ready_;
88 };
89 
90 } // namespace detail
91 } // namespace asio
92 } // namespace boost
93 
94 #include <boost/asio/detail/pop_options.hpp>
95 
96 #endif // defined(BOOST_ASIO_HAS_IOCP)
97 
98 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
99