1 #ifndef FIO_RAND_H 2 #define FIO_RAND_H 3 4 #define FRAND_MAX (-1U) 5 6 struct frand_state { 7 unsigned int s1, s2, s3; 8 }; 9 10 static inline void frand_copy(struct frand_state *dst, 11 struct frand_state *src) 12 { 13 dst->s1 = src->s1; 14 dst->s2 = src->s2; 15 dst->s3 = src->s3; 16 } 17 18 static inline unsigned int __rand(struct frand_state *state) 19 { 20 #define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b) 21 22 state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12); 23 state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4); 24 state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17); 25 26 return (state->s1 ^ state->s2 ^ state->s3); 27 } 28 29 extern void init_rand(struct frand_state *); 30 extern void init_rand_seed(struct frand_state *, unsigned int seed); 31 extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed); 32 extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len); 33 extern void __fill_random_buf_percentage(unsigned long, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int); 34 extern unsigned long fill_random_buf_percentage(struct frand_state *, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int); 35 extern void fill_pattern(void *p, unsigned int len, char *pattern, unsigned int pattern_bytes); 36 37 #endif 38
