From: Colin Nevin (colin_nevin at domain yahoo.com)
Date: Fri 06 Sep 2002 - 15:14:56 IST
Hi
Success! I got around the problem by making my
subprocesses sleep for 20milliseconds before they go
off and try sync'ing via semop(), does this imply
something odd (or slow) with the system V
implementation of semop in the kernel? As the same
code runs fine on SCO, though it could just be one of
those mysteries in life...lol
C.
--- Padraig Brady <padraig.brady at domain corvil.com> wrote: >
Colin Nevin wrote:
> > Hi All,
> >
> > I have a question which is a bit tricky and was
> > wondering of anyone has come across this problem
> > before or could point me in the right direction.
> >
> > I am involved in porting a SCO unix application to
> > Linux, and we have encountered a problem with the
> way
> > semaphores are being handled.
>
> I would guess that the "error" values returned
> are not being processed correctly. I think his would
> be the main source of differences between SCO and
> Linux
> if there were any.
>
> info libc "Interrupted Primitives" might have
> also have pertinent info?
>
> > I have also noticed that if I introduce a slight
> delay
> > between changing semaphore states the problem goes
> > away, but this causes our entire application to
> run
> > really sloooww !! lol
>
> Think that's bad! Eircell bought a mad
> mainframe class machine from Compaq (GS160) to
> run their billing app faster. But it ran at exactly
> the same speed for some reason. I was called in
> and promptly found a sleep(1) synchronisation
> between 2 processes! So much for throwing hardware
> at a problem.
>
> Padraig.
>
>
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