From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.5-pre1 (2020-06-20) on
	ip-172-31-74-118.ec2.internal
X-Spam-Level: 
X-Spam-Status: No, score=0.0 required=3.0 tests=BAYES_20,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.5-pre1
X-Received: by 2002:a0c:ea4d:: with SMTP id u13mr14539127qvp.22.1623602782213;
        Sun, 13 Jun 2021 09:46:22 -0700 (PDT)
X-Received: by 2002:a25:fc1c:: with SMTP id v28mr19059061ybd.277.1623602782035;
 Sun, 13 Jun 2021 09:46:22 -0700 (PDT)
Path: eternal-september.org!reader02.eternal-september.org!news.mixmin.net!proxad.net!feeder1-2.proxad.net!209.85.160.216.MISMATCH!news-out.google.com!nntp.google.com!postnews.google.com!google-groups.googlegroups.com!not-for-mail
Newsgroups: comp.lang.ada
Date: Sun, 13 Jun 2021 09:46:21 -0700 (PDT)
In-Reply-To: <14166772-2507-4953-8843-57fe35b0f6fbn@googlegroups.com>
Injection-Info: google-groups.googlegroups.com; posting-host=174.71.119.33; posting-account=ix5KpAoAAAD9zo_4u1FxHVmn1uZn7U_d
NNTP-Posting-Host: 174.71.119.33
References: <c6169572-25bc-4db7-a50d-c6c8575069a4n@googlegroups.com>
 <sa2bpc$it8$1@gioia.aioe.org> <aa8d1e4f-494e-4d8a-8c44-edfdb7f3ec04n@googlegroups.com>
 <sa2lhe$ig3$1@gioia.aioe.org> <1d798609-8b73-4bc6-b74f-e435e8af8fedn@googlegroups.com>
 <sa482l$ocp$1@franka.jacob-sparre.dk> <26182d75-4a84-47d2-b151-bbcb01964fabn@googlegroups.com>
 <sa50fc$db5$1@dont-email.me> <14166772-2507-4953-8843-57fe35b0f6fbn@googlegroups.com>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <5470ede9-7036-4af7-8087-6dc8ff8f9ca0n@googlegroups.com>
Subject: Re: non-preemptive tasking on GNAT 2020 Windows 10 multicore AMD
From: Dan Winslow <dandwinslow@gmail.com>
Injection-Date: Sun, 13 Jun 2021 16:46:22 +0000
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Xref: reader02.eternal-september.org comp.lang.ada:62218
List-Id: <comp.lang.ada>

On Sunday, June 13, 2021 at 11:44:00 AM UTC-5, Dan Winslow wrote:
> On Sunday, June 13, 2021 at 8:16:31 AM UTC-5, Jeffrey R. Carter wrote:=20
> > 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 lo=
oking for? How does linux do in this regard, I could use it if needed.=20
> > 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=20
> > Task two done, y=3D 1000001=20
> > 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 =
underlying os threads, windows has its own ideas and does things like autom=
atic priority promotion and other non-compliant stuff. Too bad, but I guess=
 kind of makes sense because windows does everything possible, most likely,=
 to prevent any kind of thread monopolization. Would be nice if the gnat wi=
ndows version at least threw a warning that 'hey, it's legal, but it aint g=
onna work on windows'.=20
>=20
> So, works perfectly on linux. Probably would on windows too if I knew how=
 to swap out for a pthreads implementation on windows.=20
>=20
> Thanks!

Odd that it doesn't require the gnat.adc pragma though. I suppose linux is =
counting on delay statements or other sync points to swap. For what I need,=
 that's perfect.