include/atomic.h

   1 /*
   2  * Copyright (c) 2011 RedHat, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __ATOMIC_H__
  19 #define __ATOMIC_H__
  20
  21 /*
  22  * Warning: These are not really atomic at all. They are wrappers around the
  23  * kernel atomic variable interface. If we do need these variables to be atomic
  24  * (due to multithreading of the code that uses them) we need to add some
  25  * pthreads magic here.
  26  */
  27 typedef int32_t atomic_t;
  28 typedef int64_t atomic64_t;
  29
  30 #define atomic_inc_return(x)    (++(*(x)))
  31 #define atomic_dec_return(x)    (--(*(x)))
  32
  33 #define atomic64_read(x)        *(x)
  34 #define atomic64_set(x, v)      (*(x) = v)
  35
  36 #endif /* __ATOMIC_H__ */