Re: [HEADS UP] movemail locking overhaul ahead
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>>>> "Jan" == Jan Vroonhof
<vroonhof(a)math.ethz.ch> writes:
Jan> sperber(a)informatik.uni-tuebingen.de (Michael Sperber [Mr. Preprocessor]) writes:
> The locking policies can be controlled through three mechanisms
(by
> descending precedence):
>
> - Specification on the movemail command line.
> - Specification of an environment variable EMACSLOCKMETHOD with the
> same possible values as the --mail-locking argument to configure.
> - Configuration via autoconf and src/config.h.
Jan> I propose that it should (by default) always use dotlocking (even
Jan> together with any other method).
I don't believe that's a good idea: Locking would no longer be atomic,
and you can get deadlocks that way.
--
Cheers =8-} Chipsy
Friede, Völkerverständigung und überhaupt blabla
Glynn Clements
Tuesday, 9 November
Tue, 9 Nov
12:53 p.m.
New subject: [HEADS UP] movemail locking overhaul ahead
Michael Sperber [Mr. Preprocessor] wrote:
Jan> I propose that it should (by default) always use dotlocking
(even
Jan> together with any other method).
I don't believe that's a good idea: Locking would no longer be atomic,
and you can get deadlocks that way.
I don't think that it's that big a problem. If the second lock fails,
you release the first lock and wait for a bit. Then the worst that can
happen is a livelock.
FWIW, procmail (on Linux at least) uses both dot-locking and kernel
locks (can't remember whether it's flock, fcntl or lockf).
--
Glynn Clements <glynn(a)sensei.co.uk>
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