ceph/src/boost/libs/smart_ptr/include/boost/smart_ptr/detail/atomic_count_sync.hpp

   1 #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SYNC_HPP_INCLUDED
   2 #define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SYNC_HPP_INCLUDED
   3
   4 //
   5 //  boost/detail/atomic_count_sync.hpp
   6 //
   7 //  atomic_count for g++ 4.1+
   8 //
   9 //  http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Atomic-Builtins.html
  10 //
  11 //  Copyright 2007 Peter Dimov
  12 //
  13 //  Distributed under the Boost Software License, Version 1.0. (See
  14 //  accompanying file LICENSE_1_0.txt or copy at
  15 //  http://www.boost.org/LICENSE_1_0.txt)
  16 //
  17
  18 #if defined( __ia64__ ) && defined( __INTEL_COMPILER )
  19 # include <ia64intrin.h>
  20 #endif
  21
  22 namespace boost
  23 {
  24
  25 namespace detail
  26 {
  27
  28 class atomic_count
  29 {
  30 public:
  31
  32     explicit atomic_count( long v ) : value_( v ) {}
  33
  34     long operator++()
  35     {
  36         return __sync_add_and_fetch( &value_, 1 );
  37     }
  38
  39     long operator--()
  40     {
  41         return __sync_add_and_fetch( &value_, -1 );
  42     }
  43
  44     operator long() const
  45     {
  46         return __sync_fetch_and_add( &value_, 0 );
  47     }
  48
  49 private:
  50
  51     atomic_count(atomic_count const &);
  52     atomic_count & operator=(atomic_count const &);
  53
  54     mutable long value_;
  55 };
  56
  57 } // namespace detail
  58
  59 } // namespace boost
  60
  61 #endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SYNC_HPP_INCLUDED