LXR linux/arch/sparc/include/asm/atomic

   1/* atomic.h: These still suck, but the I-cache hit rate is higher.
   2 *
   3 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
   4 * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com.au)
   5 * Copyright (C) 2007 Kyle McMartin (kyle@parisc-linux.org)
   6 *
   7 * Additions by Keith M Wesolowski (wesolows@foobazco.org) based
   8 * on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>.
   9 */
  10
  11#ifndef __ARCH_SPARC_ATOMIC__
  12#define __ARCH_SPARC_ATOMIC__
  13
  14#include <linux/types.h>
  15
  16#include <asm/cmpxchg.h>
  17#include <asm/barrier.h>
  18#include <asm-generic/atomic64.h>
  19
  20
  21#define ATOMIC_INIT(i)  { (i) }
  22
  23int atomic_add_return(int, atomic_t *);
  24int atomic_cmpxchg(atomic_t *, int, int);
  25int atomic_xchg(atomic_t *, int);
  26int __atomic_add_unless(atomic_t *, int, int);
  27void atomic_set(atomic_t *, int);
  28
  29#define atomic_read(v)          ACCESS_ONCE((v)->counter)
  30
  31#define atomic_add(i, v)        ((void)atomic_add_return( (int)(i), (v)))
  32#define atomic_sub(i, v)        ((void)atomic_add_return(-(int)(i), (v)))
  33#define atomic_inc(v)           ((void)atomic_add_return(        1, (v)))
  34#define atomic_dec(v)           ((void)atomic_add_return(       -1, (v)))
  35
  36#define atomic_sub_return(i, v) (atomic_add_return(-(int)(i), (v)))
  37#define atomic_inc_return(v)    (atomic_add_return(        1, (v)))
  38#define atomic_dec_return(v)    (atomic_add_return(       -1, (v)))
  39
  40#define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
  41
  42/*
  43 * atomic_inc_and_test - increment and test
  44 * @v: pointer of type atomic_t
  45 *
  46 * Atomically increments @v by 1
  47 * and returns true if the result is zero, or false for all
  48 * other cases.
  49 */
  50#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
  51
  52#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
  53#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
  54
  55#endif /* !(__ARCH_SPARC_ATOMIC__) */
  56