'Unable to read from thread kernel pipe' error in Apache

[Will McCutcheon]

On July 28, 2004 5:32:33 PM EDT Alex Dupre <ale at FreeBSD.org> wrote:
> Threaded apache requires threaded php. That's normal, and since some 
> extensions are not thread-safe it's normal to expect crashes. Use 
> apache prefork if you need stability.

Pardon my ignorance, but isn't the Apache 2 port built with prefork by 
default?  httpd -l says the following:

Compiled in modules:
  core.c
  prefork.c
  http_core.c
  mod_so.c

And the package comment reads:

Version 2 of Apache web server with prefork MPM.

So, am I not already using Apache prefork?  Again, please excuse any misunderstanding on my part, we're in territory I'm not as comfortable in.  Thanks for your help!

W