Hello,
I've found a "undocumented feature" in the RTAI fifos (new fifos (both version 0.9a
and 1.5)). We are unable to perform a select system call from a user-space program
(actually this is a TCL script that use the filevent TCL feature, but if you look
through strace you can actually see that this is a call to select with a
filedescriptor corresponding to the FIFO). Although the real-time process perform a
write on the FIFO, the user-space process doesn't wake-up. We observed that it sleeps
on the select
system call.
The only work-around we had, is to have a separate user-space process that does a
blocking read on the RT-FIFO and then we something is written, reads the RT-FIFO and
rewrite the information on named pipe on which the script is now sleeping. This works
but, it's not very elegant and it wastes CPU power.
Thanks for your help.
Laurent Kersten
Alcatel Bell Space N.V.
Berkenrodelei 33
B-2660 Hoboken.
Tel : 00-32-3-829.54.09
Fax : 00-32-3-829.57.63
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