+1 here - we shouldn't be dispatching to NULL().
A couple of random thoughts:
1) Would it be better to check for NULL before calling the functions? (mod_dav tends to do this)
2) Or, how about a proc_mutex_tryacquire_notimpl instead? Have a standard function that just returns APR_ENOTIMPL. (buckets tend to do this)
No big deal either way. -- justin
