Re: delay until and GNAT

[Buz Cory <hacker@buzco.ddns.org>]

In article <7gpukr$s82$1@nnrp1.dejanews.com>,
  dennison@telepath.com wrote:
> In article <m3_X2.48$6o.1372369@news.siol.net>,
>   "isaac buchwald" <isaac.buchwald@velenje.cx> wrote:
> >
> >   Does  someone  know  the   upper bound  on the lateness of  delay  until
> > and delay relative
> >  for  Gnat  implement.  on  Win95 , WinNT   or  Linux.
>
> I'm not sure there *is* an upper bound. What if a higher priority task is
> running in a busy loop?

That should be correct. There is no guarantee of *maximum* delay between *any*
two statements in Ada.

In particular, for "delay" and "delay until", the only guarantee is that the
delay will have elapsed when the next statement executes. How long ago it
might have elapsed is *not* guaranteed. This is pretty much true of any
prioritized multi-tasking system. For a time-slicing system, you might
reasonably expect that the "upper bound  on the lateness of  delay" will be
some relatively small number times the maximum size of a slice (for 10 ms
slices, it should be of the order of 1 sec or so).

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