Adi Sudewa wrote:
>
> Hello,
>
> 1. What is the highest and lowest priority of a task ?
> Can a thread change its priority dynamically ?
lowest priority = 1, RTLinux/RTAI may have different upper limits for
their pthreads, but conventionally POSIX threads on Linux are limited to
99, so this is not a bad retriction to copy.
>
> 2. What is the difference between one-shot clock and periodic clock ?
> (There's no explanation in the manual)
See my posting yesterday. But to recap:
Periodic: less overhead, but can only have tasks that are a multiple of
a base period
One-shot: more overhead, but can have un-related task periods
>
> 3. Can I call a Linux system call ? Of course this will screw up the hard
> real-time constraints, but in case ...
>
In general the answer is no as you may lock up your system. There was a
nice posting yesterday about what was safe/non-safe
Regards, Stuart
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