drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r: generovat rovnoměrně distribuovaná pseudonáhodná čísla reentrantně

Originální popis anglicky: drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r - generate uniformly distributed pseudo-random numbers reentrantly

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#include <stdlib.h>
 
int drand48_r(struct drand48_data *buffer, double *result);
 
int erand48_r(unsigned short xsubi[3],
 
              struct drand48_data *buffer, double *result);
 
int lrand48_r(struct drand48_data *buffer, long int *result);
 
int nrand48_r(unsigned short int xsubi[3],
 
              struct drand48_data *buffer, long int *result);
 
int mrand48_r(struct drand48_data *buffer,long int *result);
 
int jrand48_r(unsigned short int xsubi[3],
 
              struct drand48_data *buffer, long int *result);
 
int srand48_r(long int seedval, struct drand48_data *buffer);
 
int seed48_r(unsigned short int seed16v[3],
 
             struct drand48_data *buffer);
 
int lcong48_r(unsigned short int param[7],
 
              struct drand48_data *buffer);

POPIS / INSTRUKCE

These functions are the reentrant analogs of the functions described in drand48(3). Instead of modifying the global random generator state, they use the supplied data buffer. Before the first use, this struct must be initialized, e.g. by filling it with zeroes, or by calling one of the functions srand48_r(), seed48_r(), or lcong48_r().

NÁVRATOVÁ HODNOTA

The return value is 0.

ODPOVÍDAJÍCÍ

These functions are GNU extensions and are not portable.

SOUVISEJÍCÍ

drand48(3), rand(3), random(3)