Re: non-preemptive tasking on GNAT 2020 Windows 10 multicore AMD

[darek <darek.maksimiuk@gmail.com>]

On Sunday, 13 June 2021 at 08:20:08 UTC+2, Randy Brukardt wrote:
> "AdaMagica" <christ-u...@t-online.de> wrote in message 
> news:1d798609-8b73-4bc6...@googlegroups.com...
> > 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?
> Not really, at least in an Annex D sense. (The core doesn't require much, in 
> part so Ada will work on a wide variety of targets.) Pretty much everyone 
> has agreed to ignore the impossibility of implementing Annex D on Windows -- 
> remember that there is an "impossible or impractical" exception in 1.1.3 
> which certainly applies in this case. Indeed, I suspect that it is 
> impossible to implement all of Annex D on any target other than a bare 
> machine. (One example is that there is no known implementation of EDF 
> scheduling even though Annex D seems to require it to be implemented.) 
> 
> Randy.


Hi All,
  It could be useful for Ada community - a bit different (and refreshing) approach :

      https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/154828/eth-47094-02.pdf

 Darek