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Date: Thu, 19 Dec 2024 13:39:47 -0500
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Subject: Re: 2 SCHED_IDLE bugs in Cygwin 3.6
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To: Cedric Blancher <cedric DOT blancher AT gmail DOT com>, cygwin AT cygwin DOT com
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From: Eliot Moss via Cygwin <cygwin AT cygwin DOT com>
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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.

Cheers - Eliot

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