jrand48()

Generate a pseudo-random signed long integer

Synopsis:

#include <stdlib.h>

long jrand48( unsigned short xsubi[3] );

Library:

libc

Description:

The jrand48() function uses a linear congruential algorithm and 48-bit integer arithmetic to generate a signed long integer uniformly distributed over the interval [-2^31, 2^31).

The xsubi array should contain the desired initial value; this makes jrand48() thread-safe, and lets you start a sequence of random numbers at any known value.

Returns:

A pseudo-random long integer.

Classification:

Standard Unix

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	No
Thread	Yes