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

   1 //
   2 // detail/gcc_sync_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_GCC_SYNC_FENCED_BLOCK_HPP
  12 #define BOOST_ASIO_DETAIL_GCC_SYNC_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(__GNUC__) \
  21   && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)) \
  22   && !defined(__INTEL_COMPILER) && !defined(__ICL) \
  23   && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
  24
  25 #include <boost/asio/detail/noncopyable.hpp>
  26
  27 #include <boost/asio/detail/push_options.hpp>
  28
  29 namespace boost {
  30 namespace asio {
  31 namespace detail {
  32
  33 class gcc_sync_fenced_block
  34   : private noncopyable
  35 {
  36 public:
  37   enum half_or_full_t { half, full };
  38
  39   // Constructor.
  40   explicit gcc_sync_fenced_block(half_or_full_t)
  41     : value_(0)
  42   {
  43     __sync_lock_test_and_set(&value_, 1);
  44   }
  45
  46   // Destructor.
  47   ~gcc_sync_fenced_block()
  48   {
  49     __sync_lock_release(&value_);
  50   }
  51
  52 private:
  53   int value_;
  54 };
  55
  56 } // namespace detail
  57 } // namespace asio
  58 } // namespace boost
  59
  60 #include <boost/asio/detail/pop_options.hpp>
  61
  62 #endif // defined(__GNUC__)
  63        // && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4))
  64        // && !defined(__INTEL_COMPILER) && !defined(__ICL)
  65        // && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
  66
  67 #endif // BOOST_ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP