[EMAIL PROTECTED] wrote:
>
> Hello,
>
> I discovered something strange with the FIFOs (RTAI-1.5). I wrote a small RT task
>that basically put a character to a FIFO, do a few thing (print a message in the log
>file and do a few computation). and then read the FIFO again. This is the only RT
>task in
> the system. So normally, you expect every read to succeed. However, I observed a
>strangebehaviour. If when my task is running, I lauch a "cat </dev/rtf10" process on
>the shell prompt. The command gives me characters !!!!!!!!. So, this means that the
> rtf_put function stop the thread and do some rescheduling and so allow the linux
>process to read the character ... And the consequence is .... a simple Linux user
>space program is able to preempt a real time task which is not the expected behaviour
>in a
> realtime system.
>
> Does anybody know a mean for solving this undesirable side effect ?
>
> Laurent
Send me the code. I think I can easilly put a preemtion check in the
real time task and see if your assumption is right.
Ciao, Paolo.
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