повторно генерировать равномерно распределенные псевдослучайные числа (generate uniformly distributed pseudo-random numbers reentrantly)
Имя (Name)
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
Синопсис (Synopsis)
#include <stdlib.h>
int drand48_r(struct drand48_data *restrict buffer,
double *restrict result);
int erand48_r(unsigned short xsubi[3],
struct drand48_data *restrict buffer,
double *restrict result);
int lrand48_r(struct drand48_data *restrict buffer,
long *restrict result);
int nrand48_r(unsigned short xsubi[3],
struct drand48_data *restrict buffer,
long *restrict result);
int mrand48_r(struct drand48_data *restrict buffer,
long *restrict result);
int jrand48_r(unsigned short xsubi[3],
struct drand48_data *restrict buffer,
long *restrict result);
int srand48_r(long int seedval, struct drand48_data *buffer);
int seed48_r(unsigned short seed16v[3], struct drand48_data *buffer);
int lcong48_r(unsigned short param[7], struct drand48_data *buffer);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
All functions shown above:
/* Glibc since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
Описание (Description)
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, for
example, by filling it with zeros, or by calling one of the
functions srand48_r(), seed48_r(), or lcong48_r().
Возвращаемое значение (Return value)
The return value is 0.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────┬───────────────┬─────────────────────┐
│Interface │ Attribute │ Value │
├──────────────────────────┼───────────────┼─────────────────────┤
│drand48_r(), erand48_r(), │ Thread safety │ MT-Safe race:buffer │
│lrand48_r(), nrand48_r(), │ │ │
│mrand48_r(), jrand48_r(), │ │ │
│srand48_r(), seed48_r(), │ │ │
│lcong48_r() │ │ │
└──────────────────────────┴───────────────┴─────────────────────┘
Стандарты (Conforming to)
These functions are GNU extensions and are not portable.
Смотри также (See also)
drand48(3), rand(3), random(3)
