1 /* $Id: atomic.h,v 1.22 2001/07/11 23:56:07 davem Exp $
2 * atomic.h: Thankfully the V9 is at least reasonable for this
5 * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com)
8 #ifndef __ARCH_SPARC64_ATOMIC__
9 #define __ARCH_SPARC64_ATOMIC__
11 #include <linux/types.h>
13 typedef struct { volatile int counter; } atomic_t;
14 typedef struct { volatile __s64 counter; } atomic64_t;
16 #define ATOMIC_INIT(i) { (i) }
17 #define ATOMIC64_INIT(i) { (i) }
19 #define atomic_read(v) ((v)->counter)
20 #define atomic64_read(v) ((v)->counter)
22 #define atomic_set(v, i) (((v)->counter) = i)
23 #define atomic64_set(v, i) (((v)->counter) = i)
25 extern int __atomic_add(int, atomic_t *);
26 extern int __atomic64_add(__s64, atomic64_t *);
28 extern int __atomic_sub(int, atomic_t *);
29 extern int __atomic64_sub(__s64, atomic64_t *);
31 #define atomic_add(i, v) ((void)__atomic_add(i, v))
32 #define atomic64_add(i, v) ((void)__atomic64_add(i, v))
34 #define atomic_sub(i, v) ((void)__atomic_sub(i, v))
35 #define atomic64_sub(i, v) ((void)__atomic64_sub(i, v))
37 #define atomic_dec_return(v) __atomic_sub(1, v)
38 #define atomic64_dec_return(v) __atomic64_sub(1, v)
40 #define atomic_inc_return(v) __atomic_add(1, v)
41 #define atomic64_inc_return(v) __atomic64_add(1, v)
44 * atomic_inc_and_test - increment and test
45 * @v: pointer of type atomic_t
47 * Atomically increments @v by 1
48 * and returns true if the result is zero, or false for all
51 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
53 #define atomic_sub_and_test(i, v) (__atomic_sub(i, v) == 0)
54 #define atomic64_sub_and_test(i, v) (__atomic64_sub(i, v) == 0)
56 #define atomic_dec_and_test(v) (__atomic_sub(1, v) == 0)
57 #define atomic64_dec_and_test(v) (__atomic64_sub(1, v) == 0)
59 #define atomic_inc(v) ((void)__atomic_add(1, v))
60 #define atomic64_inc(v) ((void)__atomic64_add(1, v))
62 #define atomic_dec(v) ((void)__atomic_sub(1, v))
63 #define atomic64_dec(v) ((void)__atomic64_sub(1, v))
65 #define atomic_add_negative(i, v) (__atomic_add(i, v) < 0)
66 #define atomic64_add_negative(i, v) (__atomic64_add(i, v) < 0)
68 /* Atomic operations are already serializing */
69 #define smp_mb__before_atomic_dec() barrier()
70 #define smp_mb__after_atomic_dec() barrier()
71 #define smp_mb__before_atomic_inc() barrier()
72 #define smp_mb__after_atomic_inc() barrier()
74 #endif /* !(__ARCH_SPARC64_ATOMIC__) */