From: Simon Wright <simon@pushface.org>
Subject: Re: Ravenscar vs selective wait
Date: Tue, 24 Mar 2015 06:48:27 +0000
Date: 2015-03-24T06:48:27+00:00 [thread overview]
Message-ID: <lyk2y6vqkk.fsf@pushface.org> (raw)
In-Reply-To: lyoanjv0g6.fsf@pushface.org
Simon Wright <simon@pushface.org> writes:
> Is it possible to construct an analog of the selective wait using the
> Ravenscar profile?
>
> Turn_On_The_Lamp;
> Next := Clock + Milliseconds (500);
> select
> accept Reset do
> Next := Clock + Milliseconds (500);
> end Reset;
> or
> delay until Next;
> Turn_Off_The_Lamp;
> end select;
This is rather simplified from what I want to achieve, and I can think
of an ugly solution for it.
Turn_On_The_Lamp;
Next := Clock + Milliseconds (500); -- Next is a shared variable
loop
delay until Next;
if Next <= Clock then
exit;
else
-- something else in the program has updated Next
end if;
end loop;
Turn_Off_The_Lamp;
But what if I need the next wake-up to be *earlier*?
next prev parent reply other threads:[~2015-03-24 6:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-23 22:00 Ravenscar vs selective wait Simon Wright
2015-03-24 6:48 ` Simon Wright [this message]
2015-03-24 7:25 ` Jeffrey Carter
2015-03-24 9:21 ` J-P. Rosen
2015-03-24 17:16 ` Jeffrey Carter
2015-03-24 20:12 ` Simon Wright
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