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

   1 //
   2 // detail/win_fenced_block.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 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
  24 #include <boost/asio/detail/push_options.hpp>
  25
  26 namespace boost {
  27 namespace asio {
  28 namespace detail {
  29
  30 class win_fenced_block
  31   : private noncopyable
  32 {
  33 public:
  34   enum half_t { half };
  35   enum full_t { full };
  36
  37   // Constructor for a half fenced block.
  38   explicit win_fenced_block(half_t)
  39   {
  40   }
  41
  42   // Constructor for a full fenced block.
  43   explicit win_fenced_block(full_t)
  44   {
  45 #if defined(__BORLANDC__)
  46     LONG barrier = 0;
  47     ::InterlockedExchange(&barrier, 1);
  48 #elif defined(BOOST_ASIO_MSVC) \
  49   && ((BOOST_ASIO_MSVC < 1400) || !defined(MemoryBarrier))
  50 # if defined(_M_IX86)
  51 #  pragma warning(push)
  52 #  pragma warning(disable:4793)
  53     LONG barrier;
  54     __asm { xchg barrier, eax }
  55 #  pragma warning(pop)
  56 # endif // defined(_M_IX86)
  57 #else
  58     MemoryBarrier();
  59 #endif
  60   }
  61
  62   // Destructor.
  63   ~win_fenced_block()
  64   {
  65 #if defined(__BORLANDC__)
  66     LONG barrier = 0;
  67     ::InterlockedExchange(&barrier, 1);
  68 #elif defined(BOOST_ASIO_MSVC) \
  69   && ((BOOST_ASIO_MSVC < 1400) || !defined(MemoryBarrier))
  70 # if defined(_M_IX86)
  71 #  pragma warning(push)
  72 #  pragma warning(disable:4793)
  73     LONG barrier;
  74     __asm { xchg barrier, eax }
  75 #  pragma warning(pop)
  76 # endif // defined(_M_IX86)
  77 #else
  78     MemoryBarrier();
  79 #endif
  80   }
  81 };
  82
  83 } // namespace detail
  84 } // namespace asio
  85 } // namespace boost
  86
  87 #include <boost/asio/detail/pop_options.hpp>
  88
  89 #endif // defined(BOOST_ASIO_WINDOWS) && !defined(UNDER_CE)
  90
  91 #endif // BOOST_ASIO_DETAIL_WIN_FENCED_BLOCK_HPP