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From: Tucker Taft <stt@averstar.com>
Newsgroups: comp.lang.ada
Subject: Re: Help with Atomic_Components and whole array assignment
Date: Tue, 30 Jan 2001 10:57:10 -0500
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References: <94h55t$9a1$1@nnrp1.deja.com> <94hml1$o64$1@nnrp1.deja.com>
 <94hno6$p8s$1@nnrp1.deja.com>
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Date: 2001-01-30T15:57:10+00:00
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r_c_chapman@my-deja.com wrote:
> 
> In article <94hml1$o64$1@nnrp1.deja.com>,
>   Robert Dewar <robert_dewar@my-deja.com> wrote:
> > pragma Atomic merely says that two tasks cannot intefere with
> > one another...
> 
> Ah..got it..of course, from the point of view of another Ada task,
> the writes can be combined.  This means I've mis-understood Atomic
> for at least the last 4 years... :-(

I don't agree with Robert on this.  Have you tried writing it
as a loop rather than an aggregate assignment.  I suspect that
all Ada compilers would use separate assignments, including GNAT.
In any case, I believe they should use separate assignments.

> 
> Package Machine_Code here we come...

This is not necessarily the right conclusion in my view.
Most device drivers are written without dropping into machine
code these days.  Ada of all languages should not change that.

>  - Rod

-- 
-Tucker Taft   stt@avercom.net   http://www.averstar.com/~stt/
Chief Technology Officer, AverCom, Inc. (A Titan Company) Burlington, MA  USA
(AverCom was formed 1/1/01 from the Commercial Division of AverStar)
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