ceph/src/boost/boost/asio/detail/win_iocp_overlapped_ptr.hpp

   1 //
   2 // detail/win_iocp_overlapped_ptr.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 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_OVERLAPPED_PTR_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_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/io_context.hpp>
  23 #include <boost/asio/detail/handler_alloc_helpers.hpp>
  24 #include <boost/asio/detail/memory.hpp>
  25 #include <boost/asio/detail/noncopyable.hpp>
  26 #include <boost/asio/detail/win_iocp_overlapped_op.hpp>
  27 #include <boost/asio/detail/win_iocp_io_context.hpp>
  28
  29 #include <boost/asio/detail/push_options.hpp>
  30
  31 namespace boost {
  32 namespace asio {
  33 namespace detail {
  34
  35 // Wraps a handler to create an OVERLAPPED object for use with overlapped I/O.
  36 class win_iocp_overlapped_ptr
  37   : private noncopyable
  38 {
  39 public:
  40   // Construct an empty win_iocp_overlapped_ptr.
  41   win_iocp_overlapped_ptr()
  42     : ptr_(0),
  43       iocp_service_(0)
  44   {
  45   }
  46
  47   // Construct an win_iocp_overlapped_ptr to contain the specified handler.
  48   template <typename Handler>
  49   explicit win_iocp_overlapped_ptr(
  50       boost::asio::io_context& io_context, BOOST_ASIO_MOVE_ARG(Handler) handler)
  51     : ptr_(0),
  52       iocp_service_(0)
  53   {
  54     this->reset(io_context, BOOST_ASIO_MOVE_CAST(Handler)(handler));
  55   }
  56
  57   // Destructor automatically frees the OVERLAPPED object unless released.
  58   ~win_iocp_overlapped_ptr()
  59   {
  60     reset();
  61   }
  62
  63   // Reset to empty.
  64   void reset()
  65   {
  66     if (ptr_)
  67     {
  68       ptr_->destroy();
  69       ptr_ = 0;
  70       iocp_service_->work_finished();
  71       iocp_service_ = 0;
  72     }
  73   }
  74
  75   // Reset to contain the specified handler, freeing any current OVERLAPPED
  76   // object.
  77   template <typename Handler>
  78   void reset(boost::asio::io_context& io_context, Handler handler)
  79   {
  80     typedef win_iocp_overlapped_op<Handler> op;
  81     typename op::ptr p = { boost::asio::detail::addressof(handler),
  82       op::ptr::allocate(handler), 0 };
  83     p.p = new (p.v) op(handler);
  84
  85     BOOST_ASIO_HANDLER_CREATION((io_context, *p.p,
  86           "io_context", &io_context.impl_, 0, "overlapped"));
  87
  88     io_context.impl_.work_started();
  89     reset();
  90     ptr_ = p.p;
  91     p.v = p.p = 0;
  92     iocp_service_ = &io_context.impl_;
  93   }
  94
  95   // Get the contained OVERLAPPED object.
  96   OVERLAPPED* get()
  97   {
  98     return ptr_;
  99   }
 100
 101   // Get the contained OVERLAPPED object.
 102   const OVERLAPPED* get() const
 103   {
 104     return ptr_;
 105   }
 106
 107   // Release ownership of the OVERLAPPED object.
 108   OVERLAPPED* release()
 109   {
 110     if (ptr_)
 111       iocp_service_->on_pending(ptr_);
 112
 113     OVERLAPPED* tmp = ptr_;
 114     ptr_ = 0;
 115     iocp_service_ = 0;
 116     return tmp;
 117   }
 118
 119   // Post completion notification for overlapped operation. Releases ownership.
 120   void complete(const boost::system::error_code& ec,
 121       std::size_t bytes_transferred)
 122   {
 123     if (ptr_)
 124     {
 125       iocp_service_->on_completion(ptr_, ec,
 126           static_cast<DWORD>(bytes_transferred));
 127       ptr_ = 0;
 128       iocp_service_ = 0;
 129     }
 130   }
 131
 132 private:
 133   win_iocp_operation* ptr_;
 134   win_iocp_io_context* iocp_service_;
 135 };
 136
 137 } // namespace detail
 138 } // namespace asio
 139 } // namespace boost
 140
 141 #include <boost/asio/detail/pop_options.hpp>
 142
 143 #endif // defined(BOOST_ASIO_HAS_IOCP)
 144
 145 #endif // BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP