Hello to you all!
First my honest congratulations for the great work you did.
I'm unfortunately no RT-Linux user yet, but I follow the discussions
to get an impression of the problems arising when delving into.
Now I have a question about an email from Jens.
Jens wrote:
> From: SteenbeckDigital <[EMAIL PROTECTED]>
> Subject: [rtl] do not call Linux from within RT-LinuX
> I would like to answer round about 15000
> questions here. All of them looking like this:
> ( I use the word LinuX for the non RT part)
>
> I use ((any LinuX function)) from within my
> RT process and get ((any smptom)). Help me!!.
>
> Please fill in the symptom and the LinuX function you like :-).
> Many Linux function call sti/cli or so to do atomic things.
> Any call to LinuX from within a RtLinuX call break this!!!
>
> Example:
>
> LinuxCall{
> cli();
> do( not )disturb;
> sti();
> }
>
> If this gets called from LinuX it can be interrupted between
> cli/sti by any RTprocess. So if the RTprocess calls this
> again the atomic call is broken. So I put this on my
> "Things not to do" list and I'm fine with RTlinuX.
>
> Jens Michaelsen
I thought, that the cli()/sti() in normal kernel is mapped into an
`interruptible' CLI()/STI(), which will be executed, as soon as no
__OTHER__ Rt-Linux process with higher prio runs.
This means for me: If I call any routine, which doesn't actively suspend
my process, in an RT-module, this routine will be executed with the prio
I have asociated to the process. If I run it as RT-process, it will run
to the end, without being suspended, not even by CLI()/STI()?
Could You be so kind to give me hints, as to where I am wrong, and where
to look for the code which shows my error?
Thomas
------------------------------------------------------------------------
Thomas Fruehbeck Alcatel Austria AG
Tel: +43 1 29121 237 A-1210 Ruthnergasse 1-7, Vienna, Austria
Fax: +43 1 2921452 [EMAIL PROTECTED]
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