arch/sparc/include/asm/atomic_32.h

   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
  23 int atomic_add_return(int, atomic_t *);
  24 int atomic_cmpxchg(atomic_t *, int, int);
  25 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
  26 int __atomic_add_unless(atomic_t *, int, int);
  27 void atomic_set(atomic_t *, int);
  28
  29 #define atomic_read(v)          (*(volatile int *)&(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__) */