cleanup_for_exec() v/s spawn_proc_prog()

Hi,

I was just reading about Apache::SubProcess [1] because I wanted to do
something like [2] . But now with Apache2::SubProcess I'm a little bit
confused with the idea of spawn_proc_prog() . I will really appreciate if
someone could explain me the differences between cleanup_for_exec() and
spawn_proc_prog() .


[1]:
http://perl.apache.org/docs/1.0/guide/performance.html#Forking_and_Executing_Subprocesses_from_mod_perl

[2]:
http://perl.apache.org/docs/1.0/guide/performance.html#A_Complete_Fork_Example

--
Israel Leiva