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Linux/arch/sparc/include/asm/atomic_32.h

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  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-generic/atomic64.h>
 18 
 19 
 20 #define ATOMIC_INIT(i)  { (i) }
 21 
 22 extern int __atomic_add_return(int, atomic_t *);
 23 extern int atomic_cmpxchg(atomic_t *, int, int);
 24 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 25 extern int __atomic_add_unless(atomic_t *, int, int);
 26 extern void atomic_set(atomic_t *, int);
 27 
 28 #define atomic_read(v)          (*(volatile int *)&(v)->counter)
 29 
 30 #define atomic_add(i, v)        ((void)__atomic_add_return( (int)(i), (v)))
 31 #define atomic_sub(i, v)        ((void)__atomic_add_return(-(int)(i), (v)))
 32 #define atomic_inc(v)           ((void)__atomic_add_return(        1, (v)))
 33 #define atomic_dec(v)           ((void)__atomic_add_return(       -1, (v)))
 34 
 35 #define atomic_add_return(i, v) (__atomic_add_return( (int)(i), (v)))
 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 /* Atomic operations are already serializing */
 56 #define smp_mb__before_atomic_dec()     barrier()
 57 #define smp_mb__after_atomic_dec()      barrier()
 58 #define smp_mb__before_atomic_inc()     barrier()
 59 #define smp_mb__after_atomic_inc()      barrier()
 60 
 61 #endif /* !(__ARCH_SPARC_ATOMIC__) */
 62 

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