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From: Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
Newsgroups: comp.lang.ada,comp.os.vxworks
Subject: Re: redirecting the standard output
Date: 11 Apr 2001 08:04:07 -0400
Organization: NASA Goddard Space Flight Center
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Date: 2001-04-11T12:19:03+00:00
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"Martin Dowie" <martin.dowie@nospam.baesystems.com> writes:

> > Backing up a bit, why do you want to do this? I can guess that you
> > want to turn off some debugging output. It is _far_ better to define a
> > Debug_IO package, with a Boolean or Integer debug enabled variable.
> > Then have a style guide that says "Ada.Text_IO is _forbidden_ in
> > delivered code; use Debug_IO if you need debug output".
> 
> In our 'real' development code this is exactly what will be done (we have
> a Project.Text_IO package which is the same for all projects, and we
> slap on whatever the OS provides in the way of 'Simple_IO' via the body,
> or 'null'ed for production)
> 
> This is for testing and timing purposes.

Hmm, another requirement I use is "test and time what you fly". It is
easier to use Project.Text_IO from the start, than to change to it
later.

Also, packages should be testable without editing; use child packages to
get access to private stuff. 

> So far, from what simple tests we've run each character seems to be
> taking about 10ms to display via serial and 0.03ms via ethernet -
> does this sound reasonable to everyone?.. :-)

Hmm. Assuming 9600 baud serial link, 9 bits per character (with
parity), that's about 1 ms per character. So you seem to have a
significant tasking overhead in the serial implementation.

-- 
-- Stephe