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[Python-Dev] best place for an atomic file API
Victor Stinnervictor.stinner at gmail.com
Thu Feb 16 10:54:34 CET 2012
Most users don't need a truly ACID write, but implement their ownbest-effort function. Instead of having a different implement in eachproject, Python can provide something better, especially when the OSprovides low level function to implement such feature.Victor2012/2/16 "Martin v. Löwis" <martin at v.loewis.de>:> I'm not so sure that "atomic writes" is a useful concept. I haven't seen> a proposed implementation, yet, but I'm doubtful that truly ACID> writes are possible unless the operating system supports transactions> (which only Windows 7 does). Even if you are ignoring Isolation,> Atomic already is a challenge: if you first write to a tempfile, then> rename it, you may end up with a state tempfile (e.g. if the process> is killed), and no rollback operation.>> So "atomic write" to me promises something that it likely can't> deliver. OTOH, I still think that the promise isn't actually asked> for in practice (not even when overwriting bytecode files)
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