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)
42 : "=&r"(t), "=&r"(dummy), "+m"(*p) : "r"(t), "r"(s) : "memory" );
46 static inline void *a_cas_p(volatile void *p, void *t, void *s)
48 return (void *)a_cas(p, (int)t, (int)s);
51 static inline int a_swap(volatile int *x, int v)
66 : "=&r"(old), "=&r"(dummy), "+m"(*x) : "r"(v) : "memory" );
70 static inline int a_fetch_add(volatile int *x, int v)
85 : "=&r"(old), "=&r"(dummy), "+m"(*x) : "r"(v) : "memory" );
89 static inline void a_inc(volatile int *x)
104 : "=&r"(dummy), "+m"(*x) : : "memory" );
107 static inline void a_dec(volatile int *x)
110 __asm__ __volatile__(
122 : "=&r"(dummy), "+m"(*x) : : "memory" );
125 static inline void a_store(volatile int *p, int x)
127 __asm__ __volatile__(
135 : "+m"(*p) : "r"(x) : "memory" );
138 #define a_spin a_barrier
140 static inline void a_barrier()
142 a_cas(&(int){0}, 0, 0);
145 static inline void a_crash()
147 *(volatile char *)0=0;
150 static inline void a_and(volatile int *p, int v)
153 __asm__ __volatile__(
165 : "=&r"(dummy), "+m"(*p) : "r"(v) : "memory" );
168 static inline void a_or(volatile int *p, int v)
171 __asm__ __volatile__(
183 : "=&r"(dummy), "+m"(*p) : "r"(v) : "memory" );
186 static inline void a_or_l(volatile void *p, long v)
191 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
193 union { uint64_t v; uint32_t r[2]; } u = { v };
194 a_and((int *)p, u.r[0]);
195 a_and((int *)p+1, u.r[1]);
198 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
200 union { uint64_t v; uint32_t r[2]; } u = { v };
201 a_or((int *)p, u.r[0]);
202 a_or((int *)p+1, u.r[1]);