Re: [Xenomai-help] Native API rt_pipe_monitor() call can not be called from an RT Task in linux userspace ?

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Peter Soetens wrote:
> On Wed, Jun 17, 2009 at 10:09, Philippe Gerum<rpm@xenomai.org> wrote:
>> As you have probably understood already, building a full real-time to
>> real-time data path using pipes is not possible; this said, this is not
>> the purpose of this API anyway, which has been designed for real-time to
>> non-RT communication.
> 
> I was hoping to use rt_pipe + select in real-time context to implement
> a data receiving server for real-time inter-process communication. Is
> this possible ?
> What would happen if the real-time clients open the pipes as rt_pipes
> and start sending
> data in ? What's the alternative to listen in real-time to many
> connections from
> a single thread ?

Note that posix message queues already work for inter-process
communications, with support for select. Depending on your needs, this
may be sufficient: you will need Xenomai threads on both sides, but the
non real-time one may use the SCHED_OTHER policy.

I was thinking, maybe we could map the xnpipe to a special flag in mq_open ?

-- 
                                          Gilles