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

   1 //
   2 // detail/win_fenced_block.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_FENCED_BLOCK_HPP
  12 #define BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_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_WINDOWS) && !defined(UNDER_CE)
  21
  22 #include <boost/asio/detail/socket_types.hpp>
  23 #include <boost/asio/detail/noncopyable.hpp>
  24
  25 #include <boost/asio/detail/push_options.hpp>
  26
  27 namespace boost {
  28 namespace asio {
  29 namespace detail {
  30
  31 class win_fenced_block
  32   : private noncopyable
  33 {
  34 public:
  35   enum half_t { half };
  36   enum full_t { full };
  37
  38   // Constructor for a half fenced block.
  39   explicit win_fenced_block(half_t)
  40   {
  41   }
  42
  43   // Constructor for a full fenced block.
  44   explicit win_fenced_block(full_t)
  45   {
  46 #if defined(__BORLANDC__)
  47     LONG barrier = 0;
  48     ::InterlockedExchange(&barrier, 1);
  49 #elif defined(BOOST_ASIO_MSVC) \
  50   && ((BOOST_ASIO_MSVC < 1400) || !defined(MemoryBarrier))
  51 # if defined(_M_IX86)
  52 #  pragma warning(push)
  53 #  pragma warning(disable:4793)
  54     LONG barrier;
  55     __asm { xchg barrier, eax }
  56 #  pragma warning(pop)
  57 # endif // defined(_M_IX86)
  58 #else
  59     MemoryBarrier();
  60 #endif
  61   }
  62
  63   // Destructor.
  64   ~win_fenced_block()
  65   {
  66 #if defined(__BORLANDC__)
  67     LONG barrier = 0;
  68     ::InterlockedExchange(&barrier, 1);
  69 #elif defined(BOOST_ASIO_MSVC) \
  70   && ((BOOST_ASIO_MSVC < 1400) || !defined(MemoryBarrier))
  71 # if defined(_M_IX86)
  72 #  pragma warning(push)
  73 #  pragma warning(disable:4793)
  74     LONG barrier;
  75     __asm { xchg barrier, eax }
  76 #  pragma warning(pop)
  77 # endif // defined(_M_IX86)
  78 #else
  79     MemoryBarrier();
  80 #endif
  81   }
  82 };
  83
  84 } // namespace detail
  85 } // namespace asio
  86 } // namespace boost
  87
  88 #include <boost/asio/detail/pop_options.hpp>
  89
  90 #endif // defined(BOOST_ASIO_WINDOWS) && !defined(UNDER_CE)
  91
  92 #endif // BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP