Re: [Xenomai-help] Intermixing native and POSIX skins

["Doug Brunner" <dbrunner@domain.hid>]

Thanks Philippe. I hadn't even known about the existence of the RTIPC driver, and I definitely like the idea.

I've been experimenting with it a bit today, and found that it seems to be allowed for more than two sockets to connect to the same port. I modified iddp-sendrecv.c to have two client processes, both of which now connect to the same port as the server, then did the same thing with iddp-label.c (two clients both connect()ing to the same label).

This would cause havoc with the communications that go on between my processes--they need a one-to-one channel. I could implement semaphores to enforce this, but it would be nice to avoid that complication. Is there a way to make it happen using just the socket interface?

    Doug Brunner

-----Original Message-----
From: "Philippe Gerum" <rpm@xenomai.orgnomai.org>
Sent: Monday, March 12, 2012 12:43pm
To: "Doug Brunner" <dbrunner@domain.hid>
Cc: xenomai@xenomai.org: Re: [Xenomai-help] Intermixing native and POSIX skins

On 03/12/2012 08:12 PM, Doug Brunner wrote:
> I'd like to be able to use native skin communications services (most importantly real time pipes) from a thread created with the POSIX skin. Is this safe?

Yes, that's fine. You could also use the XDDP protocol (cross-domain 
datagram) implemented by the RTIPC Xenomai driver for exactly the same 
purpose, with a socket-based interface as a bonus.

>
> I'm doing this because I'm building a C++ library that can use either real-time communications services, when used with a real-time application, or regular Linux pipe I/O, when used with a Linux application; these services are called by tasks that need to exist in both cases. I'd like to make the tasks always POSIX threads to eliminate the need for a bunch of wrappers and preprocessor ugliness that I put there to support either skin, depending on which version of the library is being built.
>
> Thanks,
>      Doug Brunner
>
>
>
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-- 
Philippe.