[plt-scheme] calling scheme_apply from pthread

I have a C extension that creates a pthread and calls scheme_apply from it.
This crashes mzscheme with a segmentation fault.
Is there some way to call a scheme function from a pthread callback?

thanks in advance...

-- Vijay
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.racket-lang.org/users/archive/attachments/20080326/242fd0d8/attachment.html>