jrand48()
QNX SDP8.0C Library ReferenceAPIDeveloper
Generate a pseudo-random signed long integer in a thread-safe manner
Synopsis:
#include <stdlib.h>
long jrand48( unsigned short xsubi[3] );
Arguments:
- xsubi
- An array that comprises the 48 bits of the initial value that you want to use.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
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 [-231, 231). It's a thread-safe version of mrand48().
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:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | No |
| Thread | Yes |
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