Re: [Xenomai-help] Porting / API Questions

[Jan Kiszka <jan.kiszka@domain.hid>]

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Jeff Webb wrote:
> 
> I am attempting to port a real-time simulation from rtlinux3.2-pre3
> (GPL) to xenomai.  The application consists of a kernel module, and a
> user-space application.  I would like to port the application to xenomai
> with as few changes as possible, and then make improvements in
> incremental steps.  I am currently working on a Fedora Core I,
> Linux-2.4.32 / xenomai-2.1-rc4 system.
> 
> In this simulation, we use the rtlinux POSIX-like API for threads,
> timing, and writing-to / reading-from real-time FIFOs.  It looks like
> the xeno_posix API will allow me to port the thread and timing code with
> very few (if any) changes.  There does not appear to be a kernel-space
> version of read and write for use on xenomai pipes.  Am I missing
> something?

For what side, RT or non-RT? Or what service (function name) is missing
precisely?

> 
> I noticed that the rtai API appears to support real-time FIFOs, much
> like the old RTLinux API.  In light of this discovery, I changed my
> RT-Linux code to use rtf_get and rtf_put calls (instead of read/write). 
> This code seems to compile for xeno_rtai without too much trouble.
> 
> Is it okay to use the POSIX API for threads and timing, and the rtai API
> for FIFOs?  It seems like this is working, but I want to make sure that
> there are no hidden problems.

I haven't used the RTAI skin so far, but from a look at the FIFO code I
cannot find any reasons for not using it with other skins.

> 
> I have compiled my application for xenomai.  The kernel module loads
> fine, and the userspace application runs as well.  The problem I am
> having now is creating a large FIFO, which is why I wrote the previous
> email.
> 
> Any input on this porting project would be appreciated.  Thanks!
> 
> -Jeff
> 

Jan


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