From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: non-preemptive tasking on GNAT 2020 Windows 10 multicore AMD
Date: Sat, 12 Jun 2021 18:30:36 +0200 [thread overview]
Message-ID: <sa2nf9$1dbi$1@gioia.aioe.org> (raw)
In-Reply-To: 1d798609-8b73-4bc6-b74f-e435e8af8fedn@googlegroups.com
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
next prev parent reply other threads:[~2021-06-12 16:30 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-12 12:51 non-preemptive tasking on GNAT 2020 Windows 10 multicore AMD Dan Winslow
2021-06-12 13:11 ` Dmitry A. Kazakov
2021-06-12 15:43 ` AdaMagica
2021-06-12 15:57 ` Dmitry A. Kazakov
2021-06-12 16:05 ` AdaMagica
2021-06-12 16:30 ` Dmitry A. Kazakov [this message]
2021-06-12 20:56 ` Dan Winslow
2021-06-12 22:21 ` Dan Winslow
2021-06-13 1:24 ` Dennis Lee Bieber
2021-06-13 1:55 ` Dennis Lee Bieber
2021-06-13 10:24 ` J-P. Rosen
2021-06-13 12:11 ` Dan Winslow
2021-06-13 6:20 ` Randy Brukardt
2021-06-13 8:04 ` darek
2021-06-13 9:13 ` Dmitry A. Kazakov
2021-06-13 21:43 ` darek
2021-06-13 12:06 ` Dan Winslow
2021-06-13 13:16 ` Jeffrey R. Carter
2021-06-13 16:43 ` Dan Winslow
2021-06-13 16:46 ` Dan Winslow
2021-06-13 16:50 ` Dan Winslow
2021-06-13 17:44 ` Jeffrey R. Carter
2021-06-15 0:41 ` Dan Winslow
2021-06-16 0:10 ` Dennis Lee Bieber
2021-06-14 2:09 ` Dennis Lee Bieber
2021-06-12 16:03 ` AdaMagica
2021-06-12 18:02 ` Niklas Holsti
2021-06-12 20:50 ` Dan Winslow
2021-06-13 17:41 ` AdaMagica
2021-06-12 17:18 ` Dan Winslow
2021-06-12 17:21 ` Dan Winslow
2021-06-12 18:06 ` Dennis Lee Bieber
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