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Date: Sat, 12 Jun 2021 13:56:14 -0700 (PDT)
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Subject: Re: non-preemptive tasking on GNAT 2020 Windows 10 multicore AMD
From: Dan Winslow <dandwinslow@gmail.com>
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On Saturday, June 12, 2021 at 11:30:37 AM UTC-5, Dmitry A. Kazakov wrote:
> On 2021-06-12 18:05, AdaMagica wrote: 
> > Dmitry A. Kazakov schrieb am Samstag, 12. Juni 2021 um 17:57:39 UTC+2: 
> >> Because under Windows the default priority is in the time sharing class. 
> >> As the name suggests such threads are preempted when the their quant 
> >> expires. AFAIK, even a lower priority thread can preempt a higher 
> >> priority one if both are time sharing. Time sharing priority only 
> >> influences the duration of the quant and the chances to gain the processor. 
> > 
> > Hm OK. Is this compatible with the Ada RM?
> Unless tasks are scheduled by Ada from a single thread, it is difficult 
> to implement without having administrative rights. I wonder if the 
> behavior would change should the process start elevated and/or on a real 
> time priority. Something like that could be a prerequisition for the 
> pragma to work. One should take a look on the implementation notes...
> -- 
> Regards, 
> Dmitry A. Kazakov 
> http://www.dmitry-kazakov.de


run as admin made no difference.