Cygwin: Implement sched_[gs]etaffinity() commit breaks RTEMS port

[Sebastian Huber]

On 29/06/2019 02:57, Mark Geisert wrote:
> Corinna Vinschen wrote:
>> On Jun 28 10:06, Yaakov Selkowitz wrote:
>>> On Fri, 2019-06-28 at 03:17 -0700, Mark Geisert wrote:
>>>> We can call it a day, with review and release of the current patch 
>>>> state.
>>>> If you think it's worthwhile to implement CPU_SET on Cygwin now, rather
>>>> than later, I can look into it but it's not strictly necessary at this
>>>> time.
>>>
>>> We shouldn't be do things half-way.  taskset may not require it, but
>>> any use of CPU sets could very well expect this to be present:
>>>
>>> http://man7.org/linux/man-pages/man3/CPU_SET.3.html
>>
>> Agreed.  We shouldn't release 3.1 without it.
> 
> Fair enough on the requirement.  Just FYI I'll be AFK for two weeks 
> beginning July 4, so will try to get this done before I leave.  No big 
> worry there.
> 
> Please forgive my ignorance of licensing details...  Are we allowed to 
> copy GNU library source into Cygwin?  Or is re-implementation from 
> documentation the way to go?  In either case, must the glibc file 
> organization be followed or is platform-specific rejiggering acceptable?
> 
> I'd like to just add the CPU_SET macros to Cygwin's new sys/cpuset.h and 
> any needed support code to our sched.cc but am willing to hear other 
> options.

It would be nice to have a common Newlib implementation which can be 
used for Cygwin, RTEMS and other systems. The RTEMS implementation is 
BSD licensed and uses the FreeBSD BITSET(9) support:

https://www.freebsd.org/cgi/man.cgi?query=bitset&apropos=0&sektion=9

The goal of the RTEMS <sys/cpuset.h> is to provide the full glibc API

http://man7.org/linux/man-pages/man3/CPU_SET.3.html

and as much as possible from FreeBSD CPUSET(9)

https://www.freebsd.org/cgi/man.cgi?query=cpuset&sektion=9&apropos=0

If you don't want the FreeBSD compatibility in Cygwin (it may confuse 
configure scripts), then we can move this to a separate part and only 
provide it by RTEMS.

-- 
Sebastian Huber, embedded brains GmbH

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