1 #ifndef _INTERNAL_ATOMIC_H
2 #define _INTERNAL_ATOMIC_H
6 static inline int a_ctz_l(unsigned long x)
8 static const char debruijn32[32] = {
9 0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
10 31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
12 return debruijn32[(x&-x)*0x076be629 >> 27];
15 static inline int a_ctz_64(uint64_t x)
20 return 32 + a_ctz_l(y);
25 static inline int a_cas(volatile int *p, int t, int s)
29 if (!((int (*)(int, int, volatile int *))0xffff0fc0)(t, s, p))
36 static inline void *a_cas_p(volatile void *p, void *t, void *s)
38 return (void *)a_cas(p, (int)t, (int)s);
41 static inline long a_cas_l(volatile void *p, long t, long s)
43 return a_cas(p, t, s);
46 static inline int a_swap(volatile int *x, int v)
50 while (a_cas(x, old, v) != old);
54 static inline int a_fetch_add(volatile int *x, int v)
58 while (a_cas(x, old, old+v) != old);
62 static inline void a_inc(volatile int *x)
67 static inline void a_dec(volatile int *x)
72 static inline void a_store(volatile int *p, int x)
77 static inline void a_spin()
81 static inline void a_crash()
83 *(volatile char *)0=0;
86 static inline void a_and(volatile int *p, int v)
90 while (a_cas(p, old, old&v) != old);
93 static inline void a_or(volatile int *p, int v)
97 while (a_cas(p, old, old|v) != old);
100 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
103 a_and((int *)p+1, v>>32);
106 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
109 a_or((int *)p+1, v>>32);