how do i know if multiprocessing has been initialized?

hi list,

how do i know if multiprocessing has been enabled in an image
by calling mp:initialize-multiprocessing?

i am asking because ucw with the mod_lisp backend currently just runs
in the thread it was started in.  starting it in a separate thread
can be easily achieved by a read-time cond on :lispworks, but
doing this by default would break ucw for non-mp images ...

so is there something like mp:multiprocessing-initialized-p ?

thanks,
juergen