> Let's just say I thought the concept of a 4000 mHz pentium was very
> interesting. Especially when you consider that as a 14 year old (1967) I
> was excited as he** to get a 6L6 to oscillate at 1 mHz. (And dont anybody
> ask what a 6L6 is..... look it up :>)
>
> Ok, so let me ask a dumb question.
>
> What happens if I have a rtl thread dumping characters into a FIFO, and my
> linux process doesn't query and empty the FIFO for a while, maybe for a long
> while. Will the FIFO fill up and crash the system?
no you simply start losing data - fifos are non-blocking from the RT-side.
>
> Also,
>
> I want a rtlinux module to watch for the change of state of a digital input
> and then flag the change of state to the linux process and also communicate
> how much time has elapsed since the last change of state. Elapsed times
> could be anywhere from 1500 msec to 6000 msec. I figure using a FIFO to
> xmit a flag value (i.e. 0 or 1) and an elapsed time value (like the
> nanosecond clock's change in count).
>
> Am I on the right track?
you can use a fifo that the linux task has opend for reading
or you could use shared memory .
>
> Also, Victor, if you read this (or anyone else who may want to interject),
> is it normal for RTL 3.0 to pass thru single user mode on it's way to level
> 3 and then level 5 sysinit? I had to reconstruct just exactly how my PATH
> environmental variable was being built on a stock RTL 3.0 install, and it
> turns out the first 4 entries are coming from /etc/rc.d/init.d/single. Is
> this part of the plan (i.e. normal?)
>
the init levels are devined in /etc/inittab - it is basically up to
the distribution at what level they launce what - SuSE launces X
in init level 3 RedHat in init level 5 . The init level is only
a hook to what scripts are being executed (located in /etc/rc.d/rc0.d...rc6.d
for RedHat and in /sbin/init.d/rc0.d...rc6.d for SuSE) .
so every box boots into rcS first and then goes up to the initdefault also
defined in /etc/inittab .
hofrat
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