1
2#ifndef _LINUX_ATOMIC_H
3#define _LINUX_ATOMIC_H
4#include <asm/atomic.h>
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14
15static inline int atomic_add_unless(atomic_t *v, int a, int u)
16{
17 return __atomic_add_unless(v, a, u) != u;
18}
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26
27#ifndef atomic_inc_not_zero
28#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
29#endif
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42
43#ifndef atomic_inc_not_zero_hint
44static inline int atomic_inc_not_zero_hint(atomic_t *v, int hint)
45{
46 int val, c = hint;
47
48
49 if (!hint)
50 return atomic_inc_not_zero(v);
51
52 do {
53 val = atomic_cmpxchg(v, c, c + 1);
54 if (val == c)
55 return 1;
56 c = val;
57 } while (c);
58
59 return 0;
60}
61#endif
62
63#ifndef atomic_inc_unless_negative
64static inline int atomic_inc_unless_negative(atomic_t *p)
65{
66 int v, v1;
67 for (v = 0; v >= 0; v = v1) {
68 v1 = atomic_cmpxchg(p, v, v + 1);
69 if (likely(v1 == v))
70 return 1;
71 }
72 return 0;
73}
74#endif
75
76#ifndef atomic_dec_unless_positive
77static inline int atomic_dec_unless_positive(atomic_t *p)
78{
79 int v, v1;
80 for (v = 0; v <= 0; v = v1) {
81 v1 = atomic_cmpxchg(p, v, v - 1);
82 if (likely(v1 == v))
83 return 1;
84 }
85 return 0;
86}
87#endif
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95
96#ifndef atomic_dec_if_positive
97static inline int atomic_dec_if_positive(atomic_t *v)
98{
99 int c, old, dec;
100 c = atomic_read(v);
101 for (;;) {
102 dec = c - 1;
103 if (unlikely(dec < 0))
104 break;
105 old = atomic_cmpxchg((v), c, dec);
106 if (likely(old == c))
107 break;
108 c = old;
109 }
110 return dec;
111}
112#endif
113
114#ifndef CONFIG_ARCH_HAS_ATOMIC_OR
115static inline void atomic_or(int i, atomic_t *v)
116{
117 int old;
118 int new;
119
120 do {
121 old = atomic_read(v);
122 new = old | i;
123 } while (atomic_cmpxchg(v, old, new) != old);
124}
125#endif
126
127#include <asm-generic/atomic-long.h>
128#ifdef CONFIG_GENERIC_ATOMIC64
129#include <asm-generic/atomic64.h>
130#endif
131#endif
132