multithreaded PDF Rendering

FROM : Jerome Laurens
DATE : Tue Jan 15 15:01:07 2002

I actually use NSPDFImageRep to render PDF and everything works fine.
However, very complex pdf files may cause slow machines (like mine)
to stop the handling of the user interface for a long time.
So i tried to render the pdf representation using another thread,
i also used a detached drawing thread but all that does not make no
differece to me:
i still cannot use the UI while some PDF is rendering.

As i am not familiar with multithreading, i might have missed something
very important.
Any hints on how to achieve this?

TIA