calling function written for perl consumption from c

Hi,

Completely new to perlxs. So far I've managed to write a few c functions 
that work fine when referenced in perl. Now I need to call one of those 
functions from another c function. I assume that is possible and I 
assume the perl stack has to be used to make the call instead of the 
normal c conventions. Is this right?

Can someone point me in the right direction on how to do this?

Bill