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Date:	Thu, 19 Dec 2024 19:43:03 +0100
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Subject:	Re: 2 SCHED_IDLE bugs in Cygwin 3.6
To:	cygwin AT cygwin DOT com
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From:	Cedric Blancher via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Cedric Blancher <cedric DOT blancher AT gmail DOT com>
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

On Thu, 19 Dec 2024 at 19:39, Eliot Moss <moss AT cs DOT umass DOT edu> wrote:
>
> On 12/19/2024 11:38 AM, Cedric Blancher via Cygwin wrote:
> > Good afternoon!
> >
> > 2 bugs with SCHED_IDLE support in Cygwin 3.6 after SCHED_IDLE support was added:
> >
> > 1. /bin/chrt does not list SCHED_IDLE
> > $ chrt --max
> > SCHED_OTHER min/max priority    : 0/0
> > SCHED_FIFO min/max priority     : 1/32
> > SCHED_RR min/max priority       : 1/32
> >
> > 2. Prio 0 does not work:
> > chrt --idle 0 bash -c 'do something' gives an error in Cygwin 3.6, but
> > works on Linux and other Oses
> >
> > Ced
>
> I wonder if this note from the man page is relevant:
>
> "Only SCHED_FIFO, SCHED_OTHER and SCHED_RR are part of POSIX 1003.1b Process Scheduling. The other scheduling attributes
> may be ignored on some systems."
>
> Of course is SCHED_IDLE was advertised as being available, this does seem to be a bug (I see it on my system as well).
>
> I was able to use some commands under WSL (presumably more Linux-y), but none at all on Cygwin.

https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=61c2f075cd55d4a52b4713383f75870c1e416923
added SCHED_IDLE support for Cygwin 3.6. It should work.

Ced
-- 
Cedric Blancher <cedric DOT blancher AT gmail DOT com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur

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