On Mon, Nov 20, 2000 at 06:54:23PM +0200, Koxaras Aris wrote:
> Hello,
>
> I'm trying to develop a small application on RTlinux and i have
> four questions.
>
> a) Is there a way for my periodic RT task to figure out what was the state
> of the processor before the interruption? kernel or user mode?
Not any machine independent way, but it's not hard to find the data in the
linux thread structure.
>
> b) What is the difference between local/global and soft/hard irq in the
> source of RTlinux.
Mostly important on SMP processors where there is a global interrupt controller
for I/O devices that are shared by the processors and local interrupts such as the
on chip timer.
> c) I want my RT task to do the following thing.
> i) disable the delivery of interrupts to linux, by marking them pending
> ii) enable the interrupts to linux, and deliver the pending signals to
> linux
Linux interrupts are never delivered to Linux while the RT thread is running
but are delivered automatically when the RT threads are idle.
> [ BUT hardware interrupts should be caught by RT linux. ]
>
> d) Is it possible for my RT task to call some kernel functions, and if so
> what are they? For instance under what circumstances can I call
> schedule() from my RT task.
You may _never_ call schedule from an RT thread. You can call rtl_schedule, but
calling Linux schedule makes no sense.
>
> TIA
> Koxaras Aris
>
>
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--
---------------------------------------------------------
Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.rtlinux.com
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