[issue1416] dma(8): Fix race condition in multi-recipient delivery

Thu Jul 16 07:41:47 PDT 2009

Daniel Roethlisberger wrote:
Simon 'corecode' Schuber <submit at crater.dragonflybsd.org> 2009-07-16:
Simon 'corecode' Schubert <corecode at fs.ei.tum.de> added the comment:

Daniel Roethlisberger wrote:
Daniel Roethlisberger <daniel at 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 doesnÅ½t work in this case due to the semantics of
flock.
In any case, IÅ½m sorry that I cannot test / respond again for 3
weeks since IÅ½m abroad, far away from keyboard.
No problem, I fixed the issue by re-opening the queue file.  Thanks for 
your bug report!

cheers
  simon
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