diff options
Diffstat (limited to 'sys/libkern/random.c')
| -rw-r--r-- | sys/libkern/random.c | 35 |
1 files changed, 3 insertions, 32 deletions
diff --git a/sys/libkern/random.c b/sys/libkern/random.c index e5e9de6108e1..23a8887fa49b 100644 --- a/sys/libkern/random.c +++ b/sys/libkern/random.c @@ -36,43 +36,14 @@ __FBSDID("$FreeBSD$"); #include <sys/types.h> #include <sys/libkern.h> +#include <sys/prng.h> #include <sys/systm.h> -static u_long randseed = 937186357; /* after srandom(1), NSHUFF counted */ - /* - * Pseudo-random number generator for perturbing the profiling clock, - * and whatever else we might use it for. The result is uniform on - * [0, 2^31 - 1]. + * Pseudo-random number generator. The result is uniform in [0, 2^31 - 1]. */ u_long random(void) { - static bool warned = false; - - long x, hi, lo, t; - - /* Warn only once, or it gets very spammy. */ - if (!warned) { - gone_in(13, - "random(9) is the obsolete Park-Miller LCG from 1988"); - warned = true; - } - - /* - * Compute x[n + 1] = (7^5 * x[n]) mod (2^31 - 1). - * From "Random number generators: good ones are hard to find", - * Park and Miller, Communications of the ACM, vol. 31, no. 10, - * October 1988, p. 1195. - */ - /* Can't be initialized with 0, so use another value. */ - if ((x = randseed) == 0) - x = 123459876; - hi = x / 127773; - lo = x % 127773; - t = 16807 * lo - 2836 * hi; - if (t < 0) - t += 0x7fffffff; - randseed = t; - return (t); + return (prng32()); } |