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Date: Sun, 13 Jun 2021 09:43:59 -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 Sunday, June 13, 2021 at 8:16:31 AM UTC-5, Jeffrey R. Carter wrote:
> On 6/13/21 2:06 PM, Dan Winslow wrote:=20
> >=20
> > Well. You are confirming that I shouldn't expect the behavior I am look=
ing for? How does linux do in this regard, I could use it if needed.
> with Xubuntu 21.04 and GNAT 11 I get=20
>=20
> ~/Code$ ./winslow=20
> 8 CPUs=20
> one=20
> Task one done, x=3D 1000001=20
> two
> Task two done, y=3D 1000001
> main done, x 1000001 y 1000001=20
>=20
> I get this with or without the scheduling pragma in gnat.adc.=20
>=20
> --=20
> Jeff Carter=20
> "Don't knock masturbation. It's sex with someone I love."=20
> Annie Hall=20
> 45
Yep, just found that myself. So, I guess since the tasks get mapped onto un=
derlying os threads, windows has its own ideas and does things like automat=
ic priority promotion and other non-compliant stuff. Too bad, but I guess k=
ind of makes sense because windows does everything possible, most likely, t=
o prevent any kind of thread monopolization. Would be nice if the gnat wind=
ows version at least threw a warning that 'hey, it's legal, but it aint gon=
na work on windows'.

So, works perfectly on linux. Probably would on windows too if I knew how t=
o swap out for a pthreads implementation on windows.

Thanks!