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Linux/arch/sh/include/asm/atomic.h

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  1 #ifndef __ASM_SH_ATOMIC_H
  2 #define __ASM_SH_ATOMIC_H
  3 
  4 /*
  5  * Atomic operations that C can't guarantee us.  Useful for
  6  * resource counting etc..
  7  *
  8  */
  9 
 10 #include <linux/compiler.h>
 11 #include <linux/types.h>
 12 #include <asm/cmpxchg.h>
 13 #include <asm/barrier.h>
 14 
 15 #define ATOMIC_INIT(i)  { (i) }
 16 
 17 #define atomic_read(v)          ACCESS_ONCE((v)->counter)
 18 #define atomic_set(v,i)         ((v)->counter = (i))
 19 
 20 #if defined(CONFIG_GUSA_RB)
 21 #include <asm/atomic-grb.h>
 22 #elif defined(CONFIG_CPU_SH4A)
 23 #include <asm/atomic-llsc.h>
 24 #else
 25 #include <asm/atomic-irq.h>
 26 #endif
 27 
 28 #define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
 29 #define atomic_dec_return(v)            atomic_sub_return(1, (v))
 30 #define atomic_inc_return(v)            atomic_add_return(1, (v))
 31 #define atomic_inc_and_test(v)          (atomic_inc_return(v) == 0)
 32 #define atomic_sub_and_test(i,v)        (atomic_sub_return((i), (v)) == 0)
 33 #define atomic_dec_and_test(v)          (atomic_sub_return(1, (v)) == 0)
 34 
 35 #define atomic_inc(v)                   atomic_add(1, (v))
 36 #define atomic_dec(v)                   atomic_sub(1, (v))
 37 
 38 #define atomic_xchg(v, new)             (xchg(&((v)->counter), new))
 39 #define atomic_cmpxchg(v, o, n)         (cmpxchg(&((v)->counter), (o), (n)))
 40 
 41 /**
 42  * __atomic_add_unless - add unless the number is a given value
 43  * @v: pointer of type atomic_t
 44  * @a: the amount to add to v...
 45  * @u: ...unless v is equal to u.
 46  *
 47  * Atomically adds @a to @v, so long as it was not @u.
 48  * Returns the old value of @v.
 49  */
 50 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
 51 {
 52         int c, old;
 53         c = atomic_read(v);
 54         for (;;) {
 55                 if (unlikely(c == (u)))
 56                         break;
 57                 old = atomic_cmpxchg((v), c, c + (a));
 58                 if (likely(old == c))
 59                         break;
 60                 c = old;
 61         }
 62 
 63         return c;
 64 }
 65 
 66 #endif /* __ASM_SH_ATOMIC_H */
 67 

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