Waiting time during process

Hi

I use Codewarrior 8.3 for the programming XTension for Quark.

Now I have the following problem. I have to save a document as a PDF and
during the saving I have to wait in a loop until the PDF is finished. I
can't do that
in a while-loop because the PDF generation doesn't work in this case. I have
to give up processor time in the loop.
- How can I do that?
- The sleep-method is not available in Mac. Any other methods (time
functions)?
- Is there another possibility to give up processor time? If possible
without threads....
- Maybe I can release the event queue. How?

Thanks a lot for any help

Regards
Hans