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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT.Sockets: Timeval_Duration is in milliseconds?
Date: Sat, 08 Dec 2007 22:11:49 +0000
Organization: Pushface
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Date: 2007-12-08T22:11:49+00:00
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gpriv@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 :-(