[fpc-devel] pthread scheduler attributes

[Sven Barth]

Am 10.12.2013 12:51 schrieb "Henry Vermaak" <henry.vermaak at gmail.com>:
>
> On Tue, Dec 10, 2013 at 12:27:00PM +0100, Michael Van Canneyt wrote:
> > On Tue, 10 Dec 2013, Henry Vermaak wrote:
> >
> > >Hello everyone
> > >
> > >Could anyone tell me why threads are set to not inherit scheduling
> > >parameters from the calling thread?
> > >
> > >
http://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/rtl/unix/cthreads.pp?view=markup#l339
> >
> > No particular reason. Probably because it tries to mimic windows
behaviour.
>
> I thought Windows threads always start with the same priority as the
> process?

Yes and no. On windows processes have a process class and threads have a
priority level. Threads inherit the priority class from the process (and
this can not be changed on a per thread level) and are created with
priority level THREAD_PRIORITY_NORMAL *within* that priority class.
Changing the priority level then only changes the priority level *inside*
the priority class.
Don't know how good this Windows behavior is approximated on cthreads
systems though... (and I don't really know wether it's good to approximate
it :/ )

Regards,
Sven
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