/* $Id: atomic.h,v 1.22 2001/07/11 23:56:07 davem Exp $ * atomic.h: Thankfully the V9 is at least reasonable for this * stuff. * * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com) */ #ifndef __ARCH_SPARC64_ATOMIC__ #define __ARCH_SPARC64_ATOMIC__ #include <linux/types.h> typedef struct { volatile int counter; } atomic_t; typedef struct { volatile __s64 counter; } atomic64_t; #define ATOMIC_INIT(i) { (i) } #define ATOMIC64_INIT(i) { (i) } #define atomic_read(v) ((v)->counter) #define atomic64_read(v) ((v)->counter) #define atomic_set(v, i) (((v)->counter) = i) #define atomic64_set(v, i) (((v)->counter) = i) extern void atomic_add(int, atomic_t *); extern void atomic64_add(int, atomic64_t *); extern void atomic_sub(int, atomic_t *); extern void atomic64_sub(int, atomic64_t *); extern int atomic_add_ret(int, atomic_t *); extern int atomic64_add_ret(int, atomic64_t *); extern int atomic_sub_ret(int, atomic_t *); extern int atomic64_sub_ret(int, atomic64_t *); #define atomic_dec_return(v) atomic_sub_ret(1, v) #define atomic64_dec_return(v) atomic64_sub_ret(1, v) #define atomic_inc_return(v) atomic_add_ret(1, v) #define atomic64_inc_return(v) atomic64_add_ret(1, v) #define atomic_sub_return(i, v) atomic_sub_ret(i, v) #define atomic64_sub_return(i, v) atomic64_sub_ret(i, v) #define atomic_add_return(i, v) atomic_add_ret(i, v) #define atomic64_add_return(i, v) atomic64_add_ret(i, v) /* * atomic_inc_and_test - increment and test * @v: pointer of type atomic_t * * Atomically increments @v by 1 * and returns true if the result is zero, or false for all * other cases. */ #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) #define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0) #define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0) #define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0) #define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0) #define atomic_inc(v) atomic_add(1, v) #define atomic64_inc(v) atomic64_add(1, v) #define atomic_dec(v) atomic_sub(1, v) #define atomic64_dec(v) atomic64_sub(1, v) #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0) #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0) #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) #define atomic_add_unless(v, a, u) \ ({ \ int c, old; \ c = atomic_read(v); \ for (;;) { \ if (unlikely(c == (u))) \ break; \ old = atomic_cmpxchg((v), c, c + (a)); \ if (likely(old == c)) \ break; \ c = old; \ } \ likely(c != (u)); \ }) #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) /* Atomic operations are already serializing */ #ifdef CONFIG_SMP #define smp_mb__before_atomic_dec() membar_storeload_loadload(); #define smp_mb__after_atomic_dec() membar_storeload_storestore(); #define smp_mb__before_atomic_inc() membar_storeload_loadload(); #define smp_mb__after_atomic_inc() membar_storeload_storestore(); #else #define smp_mb__before_atomic_dec() barrier() #define smp_mb__after_atomic_dec() barrier() #define smp_mb__before_atomic_inc() barrier() #define smp_mb__after_atomic_inc() barrier() #endif #include <asm-generic/atomic.h> #endif /* !(__ARCH_SPARC64_ATOMIC__) */