On Thu, Aug 24, 2000 at 11:28:07AM -0500, Troy Davis wrote:
> Hello all-
> I want to create a thread (or process) that executes on a regular
> basis (about 20 times per second - 20 hz) in user space. Doing this
> using the rtlinux thread library in kernel space is very easy, but it
> does not appear to be the case in user space using the regular pthread
> library in linux. Another method of doing this would be to utilize a
> rtlinux timer or thread in a module but I'm unsure of how to trigger a
> function in user space from an event in rtlinux. What I'm trying to do
> is create an interrupt driven read/write function in user space to send
> and poll for messages over a tcp/ip connection. The messages being sent
> over tcp/ip do not need to occur in real-time, so a simple 'is there a
> message? okay - send it or receive it' will work. Anyone have any
> ideas on this?
I'm a little confused about what you want to do. It sounds like
there is a comlete, in Linux, solution using sched_setsched and
select and maybe rtl fifos.
make my process RR
do{ read a rt fifo to see when its time to send a message
send the message
}
where the RT thread sends the notification via the fifo.
If you want to try this, please email me for some fifo-speedup code.
--
---------------------------------------------------------
Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.rtlinux.com
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