From: Konstantin Kivi <konst@sirena.rinet.ru>
Subject: Re: Semaphores and Oracle on Unix
Date: 1997/10/10
Message-ID: <EHtqww.AH.0.debian@sirena.rinet.ru>#1/1
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arpege <arpege@imaginet.fr> wrote:
> I've read that each Oracle process needs a semaphore to be available to
> access the SGA. Is that right and if so why ?
> What is alto the difference between latch's and semaphores ?
 
>  Best Regards 
 
> Philippe (arpege@imaginet.fr)

I am not sure what do you mean under latch, but semaphore is
a unix (posix) way to order access from different process
to different objects on the system (SGA in our case).
man ipc 
man semget
man semop
man semctl

Konstantin