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From: Robert Dewar <dewar@gnat.com>
Subject: Re: homo or hetero
Date: 2000/03/01
Message-ID: <89j4qj$ihc$1@nnrp1.deja.com>#1/1
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In article <89j0hp$fl3$1@nnrp1.deja.com>,
  Oliver Kellogg <okellogg@my-deja.com> wrote:
> In article <89i5vb$tqp$1@nnrp1.deja.com>,
>   Robert Dewar <robert_dewar@my-deja.com> wrote:
>
> > [...], but what possible effect can it have on the use of
the
> > DSA whether you decide to call this situation homogenous or
> > heterogenous?
>
> The confusion stems from the Annex E implementation
> permission that
>
> "An implementation may require that the set of processing
>  nodes of a distributed system be homogeneous."
>
> The operating system (e.g. Linux vs. Linux/RT) *should*
> have no effect on the definition of "homogeneous" ?


This term is not defined in the RM, hence it is implementation
defined, so the issue is not whether something is homogenous
or not, but whether the particular configuration is supported
by the implementation you are using of Annex E. Pretty clearly
an implementation might or might not support two different
operating systems (i.e. might consider them homogenous).

But as I said earlier, the discussion is entirely academic,
since the only available implementation of Annex E,
provided as the GLADE product that works with GNAT, fully
handles the heterogenous case anyway and does not take
advantage of this very ill-defined implementation permission.
(the implementation permission is a bit silly anyway, seeing
as there is permission to omit the entire annex :-)

Robert Dewar
Ada Core Technologies


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