Re: [issue1416] dma(8): Fix race condition in multi-recipient de
Simon 'corecode' Schuber <submit@crater.dragonflybsd.org> 2009-07-16:
>
> Simon 'corecode' Schubert <corecode@fs.ei.tum.de> added the comment:
>
> Daniel Roethlisberger wrote:
> > Daniel Roethlisberger <daniel@roe.ch> 2009-07-10:
> >> I guess it is easier to lock the queue file instead of fully
> >> reopening and fixing the unlink() race.
> >
> > I cleaned up my original hack, maybe this version is a tad more
> > convincing :)
>
> This doesn't work for me. All processes are stuck in state lockf. I
> think we can't reliably combine fcntl locks and flock locks.
Is that a DragonFlyBSD issue? On FreeBSD seem to be compatible
(both according to manual page and practical testing). Using
flock to synchronize on the dup()d / fork()d queue file
descriptor doesn鬚t work in this case due to the semantics of
flock.
In any case, I鬚m sorry that I cannot test / respond again for 3
weeks since I鬚m abroad, far away from keyboard.
--
Daniel Roethlisberger
http://daniel.roe.ch/
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