Milter-greylist

> 
> > What about the following?
> 
> We still don't address the problem of stuck threads that accumulate to
> the point the process will fail. The locking problem is a symptom (that
> should be fixed), but not the root cause.
> 

Currently, the threads are accumulated because they are all permanently
waiting on a lock to have the new configuration available.
With my proposal only those threads would use the new configuration
when it is read in and available in the memory;  existing threads
use the current (old) configuration not waiting on any lock.