On Mon, 2004-01-05 at 06:47, Mark Crispin wrote: > > With mbox this could be done by adding a new header (X-IMAP-Expunged: > > timestamp). > > Indeed, but the problem with traditional UNIX mailbox format is that > shared access itself is a problem if the messages can move about in the > mailbox. Plus, there's the problem with interaction with legacy UNIX > applications that alter traditional UNIX mailbox format files.
I don't think it's that much of a problem. It may be slow when other applications modify it though. My plan is: - whenever mtime or size changes "unexpectedly", resync everything - whenever we modify or sync the mailbox, keep shared lock for two extra seconds so we can be sure that we're the only one who did modifications at a given mtime - to actually support the fast shared access, we'd have a log of recent changes in X-IMAP-Log: <timestamp> <change description>, .. header in first mail. If the log doesn't contain our last known change, resync everything Or I'm not sure if I'll bother with the last one, it can be done more easily with separate index files.
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