I figured it was a mistake to do this late at night. :(

Graham Dumpleton (JIRA) wrote:
>     [ http://issues.apache.org/jira/browse/MODPYTHON-131?page=comments#action_12369959 ] 
> 
> Graham Dumpleton commented on MODPYTHON-131:
> --------------------------------------------
> 
> In respect of:
> 
>   http://svn.apache.org/viewcvs/httpd/mod_python/trunk/src/include/mod_python.h.in?rev=385000&r1=384999&r2=385000&view=diff
> 
> I think you probably want:
> 
> /* MUTEX_DIR can be set as a configure option
>  * ./configure --with-mutex-dir=/path/to/dir
>  */
> #define MUTEX_DIR "@MUTEX_DIR@"
> 
> Ie., quote value of macro.
> 
> And in:
> 
>   http://svn.apache.org/viewcvs/httpd/mod_python/trunk/src/mod_python.c?rev=385000&r1=384999&r2=385000&view=diff
> 
> you probably want:
> 
>         snprintf(fname, 255, "%s/mpmtx%d%d", MUTEX_DIR, glb->parent_pid, n);
> 
> Ie., MUTEX_DIR is substituted using %s, as macro will not be expanded in string.

This bit is going to change anyway when I add the PythonOption 
mod_python.mutex_directory support. I have the changes ready, but I 
think I'll review them in the morning rather than committing now.

I decide to do this stuff in 2 steps:
  1. configure option
  2. PythonOption mod_python.mutex_directory
     PythonOption mod_python.mutex_locks

Jim