On Mon, Nov 13, 2000 at 05:47:55PM +0100, Paolo Mantegazza wrote:
# Denis Karpov wrote:
# >
# > hello All,
# >
# > i have a (newbie) question. i compiled and installed rtai-24.1.2.
# > (linux kernel-2.4.1-test1) all examples are running ok.
# >
# > i'm interested in fifo communication mechanism (i assume there's not
# > much difference in this between rtlinux and rtai). but all examples
# > i've seen so far use fifo to communicate between realtime task and
# > user space process. may be i'm missing something.
# >
# > are there any example that demonstrates communication
# > between a task running in kernel space (usual linux kernel module) and
# > real time task (using the same fifo mechanism, or shared memory) ?
# >
# > thank you in advance,
# >
# > Denis.
# >
# > P.S. btw, is this mailing list the appropriate place to ask questions about
# > RTAI ? unfortunately, there seems to be no offficial RTAI mailing list...
#
# I never tried it your way but it should work. Fifos do no block in
# kernel space so there should be no harm.
#
# What I do not understand is the related need, as all the kernel
# applications can freely communicate among them.
oh, yes... i should have guessed. so, if i understood right, linux is a thread
as weel as other real time tasks, i.e. everything what is running above
HAL/microkernel.
threads have common address space. => i can pass data in usual was (by calling
functions).
is that right ?
the reason why i was trying to use fifos - i misunderstood the documentation.
now i understand that fifo is mainly mechanism for communication between userspace and
real time tasks. that cost me couple of reboots :(
so is it ok if i call RT kernel module's function from withing usual kernel module ?
what about the rt scheduling in that case ?
#
# About the mailing list note that there is also
# [EMAIL PROTECTED] It is the list I use to announce RTAI
# releases and should be a neutral one. Most RTAI users are listed on it.
ok, thanx for pointer.
#
# In any case till Victor remain kind enough to keep RTAI people on the
# RTL list for me is the same, I follow both.
#
# Ciao, Paolo.
thank you. back to hacking,
Denis.
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