Isolation and Concurrency in PG functions?

Hail PG Gurus,

Can somebody please tell us about concurrency in PG functions? 

I am porting some VERY big functions to PG for a data warehousing system
(that is GPL'd BTW) and it seems that the results of one portion of the
function (e.g. a create table or a series of inserts) are invisible to
the other parts which obviously causes the function (and following
functions) to fail and is completely driving me nuts because I see the
results when I do the queries interactively.

What can I do about this? Is autocommit off in functions? How can I
bring it on? This becomes worse because transactions are not supported
in functions (anybody knows when will this be around?).

Thanks,

-Roberto Mello

-- 
Roberto Mello, rmello@cc.usu.edu - GNU/Linux Reg.User #96240 Computer Science - Utah State UniversityUSU Free Software
andGNU/Linux Club, Presidenthttp://fslc.usu.edu - http://www.brasileiro.net/roberto