From: Nate Lawson <nate-Y6VGUYTwhu0@public.gmane.org>
To: "Moore, Robert" <robert.moore-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: RE: [PATCH] Stall semantics
Date: Tue, 30 Sep 2003 14:45:03 -0700 (PDT) [thread overview]
Message-ID: <20030930144300.D81965@root.org> (raw)
In-Reply-To: <D3A3AA459175A44CB5326F26DA7A189C1C3DAB-sBd4vmA9Se58QrAoInS571DQ4js95KgL@public.gmane.org>
On Tue, 30 Sep 2003, Moore, Robert wrote:
> The ACPI spec says this:
>
> 16.2.3.4.1.15 Stall (Stall for a Short Time)
Yes, this is what I was referring to.
> StallTerm := Stall(
> MicroSecs //TermArg=>Integer
> )
> The Stall term is used to implement short-term timing requirements.
> Execution is delayed for at least the required number of microseconds.
> The implementation of Stall is OS-specific, but must not relinquish
> control of the processor. Because of this, delays longer than 100
> microseconds must use Sleep instead of Stall.
-----
>
> This seems to imply that sleep() cannot be used to implement long
> "stalls" because it can relinquish the cpu.
Please read the patch and the last sentence you quoted from the spec.
Your code already calls Sleep instead of Stall for values > 1000 us. I
simply made it stick to the spec of > 100 us.
-Nate
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next prev parent reply other threads:[~2003-09-30 21:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-30 21:38 [PATCH] Stall semantics Moore, Robert
[not found] ` <D3A3AA459175A44CB5326F26DA7A189C1C3DAB-sBd4vmA9Se58QrAoInS571DQ4js95KgL@public.gmane.org>
2003-09-30 21:45 ` Nate Lawson [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-10-03 20:23 Moore, Robert
[not found] ` <D3A3AA459175A44CB5326F26DA7A189C1C3DD1-sBd4vmA9Se58QrAoInS571DQ4js95KgL@public.gmane.org>
2003-10-03 20:28 ` Matthew Wilcox
2003-10-03 20:49 ` Nate Lawson
2003-09-30 22:04 Moore, Robert
[not found] ` <D3A3AA459175A44CB5326F26DA7A189C1C3DAF-sBd4vmA9Se58QrAoInS571DQ4js95KgL@public.gmane.org>
2003-10-01 16:59 ` Nate Lawson
[not found] ` <20031001093943.J85056-Y6VGUYTwhu0@public.gmane.org>
2003-10-01 17:16 ` Matthew Wilcox
[not found] ` <20031001171657.GW24824-+pPCBgu9SkPzIGdyhVEDUDl5KyyQGfY2kSSpQ9I8OhVaa/9Udqfwiw@public.gmane.org>
2003-10-01 17:27 ` Nate Lawson
[not found] ` <20031001101854.J85056-Y6VGUYTwhu0@public.gmane.org>
2003-10-01 18:55 ` Matthew Wilcox
[not found] ` <20031001185524.GX24824-+pPCBgu9SkPzIGdyhVEDUDl5KyyQGfY2kSSpQ9I8OhVaa/9Udqfwiw@public.gmane.org>
2003-10-01 19:45 ` Nate Lawson
2003-09-30 19:37 Nate Lawson
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