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)
40 : "=&r"(t), "=&r"(dummy) : "r"(p), "r"(t), "r"(s) : "memory" );
44 static inline void *a_cas_p(volatile void *p, void *t, void *s)
46 return (void *)a_cas(p, (int)t, (int)s);
49 static inline long a_cas_l(volatile void *p, long t, long s)
51 return a_cas(p, t, s);
55 static inline int a_swap(volatile int *x, int v)
69 : "=&r"(old), "=&r"(dummy) : "r"(x), "r"(v) : "memory" );
73 static inline int a_fetch_add(volatile int *x, int v)
87 : "=&r"(old), "=&r"(dummy) : "r"(x), "r"(v) : "memory" );
91 static inline void a_inc(volatile int *x)
105 : "=&r"(dummy) : "r"(x) : "memory" );
108 static inline void a_dec(volatile int *x)
111 __asm__ __volatile__(
122 : "=&r"(dummy) : "r"(x) : "memory" );
125 static inline void a_store(volatile int *p, int x)
128 __asm__ __volatile__(
139 : "=&r"(dummy) : "r"(p), "r"(x) : "memory" );
142 static inline void a_spin()
146 static inline void a_crash()
148 *(volatile char *)0=0;
151 static inline void a_and(volatile int *p, int v)
154 __asm__ __volatile__(
165 : "=&r"(dummy) : "r"(p), "r"(v) : "memory" );
168 static inline void a_or(volatile int *p, int v)
171 __asm__ __volatile__(
182 : "=&r"(dummy) : "r"(p), "r"(v) : "memory" );
185 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
187 union { uint64_t v; uint32_t r[2]; } u = { v };
188 a_and((int *)p, u.r[0]);
189 a_and((int *)p+1, u.r[1]);
192 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
194 union { uint64_t v; uint32_t r[2]; } u = { v };
195 a_or((int *)p, u.r[0]);
196 a_or((int *)p+1, u.r[1]);