[EMAIL PROTECTED] wrote:
>
> On Thu, Mar 23, 2000 at 03:06:27PM +0000, Stuart Hughes wrote:
> > [EMAIL PROTECTED] wrote:
> > >
> > >
> > > I'm thinking of adding RT schedulable Linux processes that run solely in user
> > > space -- when they do a syscall they fall out of RT scheduling.
> > > They would be memory protected and able to access standard libraries: they
> > > would really only be useful for high precision compute tasks and should connect
> > > to RT via fifos. Is there much interest in such a feature?
> > >
> >
> > Yes, and if you do, you'll have to call it LXRT, as hard real-time in
> > user space in RTAI exits *now* in the current release (1.2)
>
> The LXRT approach seems very useful for teaching purposes, but
> if I understand it correctly does not do what I have in mind or match
> the RTLinux model very well. Perhaps I misunderstand it.
Hi Victor,
I think you do misunderstand as what you describe could be a write up of
the latest LXRT. The first LXRT was soft real-time, but the latest one
lets you switch to hard real-time from a user space process. Once in
this mode you are restricted to RT only calls (as with RT modules), but
it does mean you don't have to write and insmod modules. The real power
is that you can *dynamically* switch between the hard/soft real-time
modes from within your application. Of course while in soft mode, you
can make normal Linux system calls etc.
Regards, Stuart
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