Re: Default of max_stack_depth and getrlimit

"Heikki Linnakangas" <heikki@enterprisedb.com> writes:
> In 8.2, we started to use getrlimit(RLIMIT_STACK, ...) to set 
> max_stack_depth automatically, to a max of 2MB:

> http://archives.postgresql.org/pgsql-hackers/2006-10/msg00389.php

> However, it's not behaving as I expected when the stack limit is set to 
> "unlimited".

Is there really any such thing as "unlimited" stack depth?  I think that
treating that as "unknown" is a good conservative thing to do, because
it is surely a lie.
        regards, tom lane