Question about random() and threads...

[wraithx@morpheus.net]

Hello,

I was wondering how the random() function was implemented?  I see in the 
documentation it mentions "a single internal generator", but if I use threads, 
with parfor() or similar, then I was wondering:

1) Is there a unique internal generator per thread?  ie Each thread can have 
it's own starting seed and produce it's own sequence of random values?

or

2) Is there a single internal generator per pari/gp instance, and each thread 
calling random() gets the next random value from that single internal generator?

Also, if 2 is the case, then is there a worry that two (or more) different 
threads calling random() will get the same value?  Or is random atomic and 
thread-safe?  Thanks for any insights you can provide!

-David C.