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 unsigned int __rand(struct frand_state *state) 11 { 12 #define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b) 13 14 state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12); 15 state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4); 16 state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17); 17 18 return (state->s1 ^ state->s2 ^ state->s3); 19 } 20 21 extern void init_rand(struct frand_state *); 22 extern void init_rand_seed(struct frand_state *, unsigned int seed); 23 extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed); 24 extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len); 25 extern unsigned long fill_random_buf_percentage(struct frand_state *, void *buf, unsigned int percentage, unsigned int segment, unsigned int len); 26 27 #endif 28
