rtprio and kse

[Daniel Eischen]

On Tue, 1 Jul 2003, David Xu wrote:
> From: "Daniel Eischen" <eischen at vigrid.com>
> > 
> > Obviously you're expectations are not correct :-)  Aside from
> > breaking POSIX (a scope process thread being silently converted
> > to a scope system thread), rtprio() is a system call and
> > affects the kernel priority.
> >
> 
> rtprio means he want to exclusively use CPU, not only between
> threads in process but also between threads in system, I can
> not image a guy is stilling using PTHREAD_SCOPE_PROCESS but not
> PTHREAD_SCOPE_SYSTEM to define a competition scope in process
> but not system wide, if he want to be rtprio in a process but
> not system scope, I think he'd use pthread_setprio(), otherwise
> setting thread to PTHREAD_SCOPE_SYSTEM is necessary.

It is legitimate to want a single (or set) of threads to
have real-time priority and not the others.  Since the
priority is in the KSEG, this is possible to do without
fork()ing.

-- 
Dan Eischen