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
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