Re: [evolution-patches] 36778, file descriptor usage problems

[Not Zed <notzed ximian com>]

committed to all branches (2.8, 2.10 and head)

On Fri, 2005-03-18 at 13:00 +0800, Not Zed wrote:
>     
>     this patch fixes a bug where a file descriptor is closed twice every time a mbox mailbox is synced.
>     
>     normally this is harmless, but if there is a lot of threading going on, it could lead to data corruption, and possibly this is the cause of bug 36778, and some 'summary mismatch' type bugs, and who knows what else.
>     
>     i.e.
>     open() = 12
>     do processing
>     close(12)
>     -> context switch
>         open () = 12
>     <- context switch
>     close(12)
>     -> context switch
>           any processing on file descriptor  will fail (spurious failures)
>     <- context switch
>     open some other file = 12
>     -> context switch
>         any processing on file will corrupt it or interfere with it
>     
>     etc.
>