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From: gpriv@axonx.com
Newsgroups: comp.lang.ada
Subject: Re: GNAT.Sockets: Timeval_Duration is in milliseconds?
Date: Sat, 8 Dec 2007 14:34:36 -0800 (PST)
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Date: 2007-12-08T14:34:36-08:00
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On Dec 8, 5:11 pm, Simon Wright <simon.j.wri...@mac.com> wrote:
> gp...@axonx.com writes:
> > I find it somewhat misleading that Timeout values use different scale
> > than Ada duration while share that type (not Ada way).  Is there a
> > purpose in that (other than direct translation in socket library).  It
> > does cost some headache to figure that out and it would be more
> > appropriate in Ada style to make a new type for timeouts or scale it
> > back to seconds.  Anyone would agree?
>
> GNAT GPL 2006[1] agrees with you! from GNAT.Sockets,
>
>    --  Timeval_Duration is a subtype of Standard.Duration because the full
>    --  range of Standard.Duration cannot be represented in the equivalent C
>    --  structure. Moreover, negative values are not allowed to avoid system
>    --  incompatibilities.
>
>    Immediate : constant := 0.0;
>    Forever   : constant := Duration (Integer'Last) * 1.0;
>
>    subtype Timeval_Duration is Duration range Immediate .. Forever;
>
> [1] No GNAT GPL 2007 for Mac OS X :-(

But that was precisely my point to rather make a new type instead of
subtyping, since scales are totally different.  But that is subjective
I guess.