Re: [Xenomai-help] rt_printf and file writing

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

nourry@domain.hid wrote:
> Hi all,
> 
> maybe another silly question but where is written string passed to rt_printf ?
> My program compiled fine but nothing appears on the screen, the issue is that
> i'm doing data acquisition and i need to check during progression values i get
> (anyway i've been asked to print these values on the screen).
> 
> Another thing, in order to keep these data even if the computer may come to
> crash, we would appreciate to save them in a file, is there a way to do so in
> realtime ?

Printing on the screen or to a file uses Linux drivers, so is not a
real-time operation, at least up to now with Xenomai. What you can do is
get real-time tasks to use a buffering IPC of some sort to let a non
real-time task do the actual writing to file or to the screen.

This is what rt_printf does. So, maybe you do not see anything because
your real-time task is running all the time and does not let linux run?

-- 
                                                 Gilles.