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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Tasking issues
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Date: Sun, 12 Aug 2007 14:05:48 +0200
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On Sun, 12 Aug 2007 12:06:52 +0100, Simon Wright wrote:

> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> 
>> I don't understand, tasks are subject of scheduling and time
>> sharing. They are switched even if they have something to do.
> 
> If you are using an OS with preemptive tasking (eg VxWorks) ready
> tasks are only switched when preempted by something of higher
> priority. A task can voluntarily move itself to the back of the ready
> queue for its priority by "delay 0.0;" (posssibly not RM-mandated
> behaviour).
> 
> Other OSs with this behaviour included (last time I had to find out)
> Solaris for tasks in the RT class and Linux running the program as
> root. Don't know about Windows.

Yes, Windows too has 16 real-time and 16 time sharing priorities. But
that's not Ada! (:-)) Ada is pragma Priority and other means to influence
tasks scheduling.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de