urcu/uatomic_arch_armv7l.h

   1 #ifndef _URCU_ARCH_UATOMIC_ARMV7L_H
   2 #define _URCU_ARCH_UATOMIC_ARMV7L_H
   3
   4 /*
   5  * Atomics for ARMv7.  This approach is usable on kernels back to 2.6.15.
   6  *
   7  * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
   8  * Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
   9  * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
  10  * Copyright (c) 2009      Mathieu Desnoyers
  11  * Copyright (c) 2010      Paul E. McKenney, IBM Corporation
  12  *                         (Adapted from uatomic_arch_ppc.h)
  13  *
  14  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
  15  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
  16  *
  17  * Permission is hereby granted to use or copy this program
  18  * for any purpose,  provided the above notices are retained on all copies.
  19  * Permission to modify the code and to distribute modified code is granted,
  20  * provided the above notices are retained, and a notice that the code was
  21  * modified is included with the above copyright notice.
  22  *
  23  * Code inspired from libuatomic_ops-1.2, inherited in part from the
  24  * Boehm-Demers-Weiser conservative garbage collector.
  25  */
  26
  27 #include <urcu/compiler.h>
  28 #include <urcu/system.h>
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 /* xchg */
  35 #define uatomic_xchg(addr, v) __sync_lock_test_and_set(addr, v)
  36
  37 /* cmpxchg */
  38 #define uatomic_cmpxchg(addr, old, _new) \
  39         __sync_val_compare_and_swap(addr, old, _new)
  40
  41 /* uatomic_add_return */
  42 #define uatomic_add_return(addr, v) __sync_add_and_fetch(addr, v)
  43
  44 #ifdef __cplusplus
  45 }
  46 #endif
  47
  48 #include <urcu/uatomic_generic.h>
  49
  50 #endif /* _URCU_ARCH_UATOMIC_ARMV7L_H */