Out of interest, what form of locking does nmh use? It looks like hard
links to ~/mail/inbox/.mh_sequences.lock for one of them. Is it
consistent in the method used everywhere, or does it mix in lockf,
flock, fcntl, etc., for other resources?
It's whatever you configure it to be (and essentially that ends up defaulting
to dot locking most of the time). Here's one of the problems: there's no
seperation between spool file locking and locking everything else.
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