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Re: RE: File Locking

by fokat (Deacon)
on Oct 24, 2001 at 23:31 UTC ( #121239=note: print w/replies, xml ) Need Help??


in reply to RE: File Locking
in thread File Locking

This is not really the fault of sendmail in modern versions. sendmail has no knowledge about the user's mailbox. This is the task of mail.local, which is the one responsible of dealing with mailboxes.

mail.local does require some form of file locking to prevent races in multiple message delivery scenarios. It attempts to use a number of schemes (fcntl(), lockf, flock, no locks at all) depending on the particular OS in which it is being installed.

Unfortunetely, locking does not work reliably in all the scenarios on all the OSes, so multiple schemes must be relied on if attempting to be portable.

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[Corion]: marioroy: Oh, that's always cool, having API-compatible modules. This makes testing and comparing things much easier
[marioroy]: IPC in MCE::Shared can handle 400k (sends) per second. That's seems a lot for being a pure-Perl module. After making the release, will come back and post a solution for a node by a fellow wanting faster logging.
[Corion]: While working on WWW::Mechanize:: Chrome, I had the suspicion that AnyEvent was doing something wrong, but I was able to swap it out for Mojolicious and the error persisted.
[Corion]: Of course, the error was in my own code ;)
[marioroy]: Corion, start and start_child in MCE::Hobo::Manager return a MCE::Hobo object, whereas P::FM returns the PID. I can have it return the PID though. I tried Hobo::Manager with several P::FM modules, just changed P::FM to MCE::Hobo::Manager and it works.

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