See Mail::Box::Locker
See SYNOPSIS in Mail::Box::Locker
Like the ::DotLock
locker, but then in an NFS-safe fashion. Over NFS,
the creation of a file is not atomic. The ::DotLock
locker depends
on an atomic open
system call, hence in not usable to lock a folder
which accessed over NFS. The ::NFS
locker is therefore more complicated (so therefore slower), but will work
for NFS --and for local disks as well.
See DESCRIPTION in Mail::Box::Locker