text: 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 [-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.
  A pseudo-random long integer.