1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 2009 Denys Vlasenko
7 * Licensed under GPLv2, see file LICENSE in this tarball for details.
10 typedef struct random_t {
11 /* Random number generators */
12 int32_t galois_LFSR; /* Galois LFSR (fast but weak). signed! */
13 uint32_t LCG; /* LCG (fast but weak) */
16 #define UNINITED_RANDOM_T(rnd) \
17 ((rnd)->galois_LFSR == 0)
19 #define INIT_RANDOM_T(rnd, nonzero, v) \
20 ((rnd)->galois_LFSR = (nonzero), (rnd)->LCG = (v))
22 #define CLEAR_RANDOM_T(rnd) \
23 ((rnd)->galois_LFSR = 0)
25 uint32_t next_random(random_t *rnd) FAST_FUNC;