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From: rracine@draper.com (Roger Racine)
Subject: Re: delay until and GNAT - expand
Date: 1999/05/07
Message-ID: <rracine.12.00086B05@draper.com>#1/1
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Date: 1999-05-07T00:00:00+00:00
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In article <k_kY2.71$6o.2036023@news.siol.net> "isaac buchwald" <isaac.buchwald@velenje.cx> writes:
>  Thank's to all.   It was  the req. of D.9(10,11).

>   So  to expand  the  ques. can you  state  any  impl.  of  Gnat ( or other
>ada95 imp.)
>  on  some  real-time system   with the  upper limit .

>    Thanks.

The implementation of "delay", given today's processor speeds, is pretty good. 
 I have recently single stepped my way (in assembly) through it, and while I 
did not count the instructions, it had to be on the order of 100 instructions.

So, given a good real-time operating system and a reasonably fast processor, a 
reasonable upper limit would probably be close to 1 microsecond (conservative 
estimate).  

I am surprised GNAT documentation does not have this, except that the number 
will be different for every underlying OS.

Roger Racine