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1fbbf72e JA |
1 | #ifndef FIO_RAND_H |
2 | #define FIO_RAND_H | |
3 | ||
4 | struct frand_state { | |
5 | unsigned int s1, s2, s3; | |
6 | }; | |
7 | ||
8 | extern struct frand_state __fio_rand_state; | |
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 *); | |
637ef8d9 | 22 | extern void fill_random_buf(void *buf, unsigned int len); |
1fbbf72e JA |
23 | |
24 | #endif |