Mr. Alvarez,
> Hmmm... This is very interesting.
>
> Can somebody point me to the documentation for fifo handlers
> running within a
> Linux context? The man page only says:
>
> "The handler is executed with the Linux (i.e., lowest) priority."
I can point you towards rtl_fifo.c in the RTLinux source where it is
obvious, but I am afraid I can not point you towards any such documentation.
The handler is, in fact, run by the function that handles putting data into
the FIFO. This is obviously running in the Linux kernel space.
> So what functions can I call from within a FIFO handler?
Almost none of the RTLinux functions are kosher at this point.
There used to be a good web page out there that showed what you could run in
which context, but I will be darned if I can find it now. Anyone know where
this is?
> In
> particular, am I allowed to use rtl_no_interrupts and
> rtl_printf? (The second
> seems to have
> been at least partly responsible for my problems).
I am absolutely certain that rtl_printf in a FIFO handler is bad
news. There are many more limitations to rtl_printf, but they are not
specific to FIFO handlers so I will ignore them here. As for
rtl_no_interrupts it should be "safe" - it is defined as inline assembly
that just executes a few instructions. I say "safe" because it should not
cause a kernel crash or any such. It is not "safe" in that you will prevent
the RTLinux scheduler from running. Thus you will lose the real-time
performance which caused you to choose RTLinux in the first place.
Regards,
Steve
--------------------------
Stephen D. Cohen
Engineering Manager
Xybion Sensor Positioning Systems
11528 53rd Street North
Clearwater, FL 33760
Voice: (727) 299-0150
Fax: (727) 299-0804
[EMAIL PROTECTED]
www.xybion.com
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