Generate a pseudo-random signed long integer in a thread-safe manner
#include <stdlib.h> long jrand48( unsigned short xsubi[3] );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
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}). 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.
A pseudo-random long integer.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |