[ECOS] eCos- Thread cycle time...

[ECOS] eCos- Thread cycle time...

[Gorjup Matthias]

Hello,


I am processing all my algorithms in a standard eCos thread. 

What is the default cycle time for threads in eCos platform ?

For example is it possible to process one Rx frame in a high priority task
thread in 4 ms ? ( Of course it depends on the length of frame however the
question is ; is it possible to process less than 10 msec or a thread in
eCos steps in every 10msec ? )

Best Regards

Matthias Gorjup

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[ECOS] Re: eCos- Thread cycle time...

[Grant Edwards]

On Mon, Aug 30, 2004 at 06:24:01PM +0200, Gorjup Matthias wrote:

> What is the default cycle time for threads in eCos platform ?

I don't understand the question.  What do you mean by "cycle
time"?

> For example is it possible to process one Rx frame in a high priority task
> thread in 4 ms? ( Of course it depends on the length of frame however the
> question is ; is it possible to process less than 10 msec or a thread in
> eCos steps in every 10msec ? )

Sure.  10ms is just the timer tick frequency.  The only thing
it affects is the granularity of things like cyg_thread_delay().
If your thread is blocked waiting for a frame, it will wake up
when the frame arrives regardless of the system timer tick
period.

-- 
Grant Edwards
grante@visi.com

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Re: [ECOS] eCos- Thread cycle time...

[Andrew Lunn]

On Mon, Aug 30, 2004 at 06:24:01PM +0200, Gorjup Matthias wrote:
> 
> Hello,
> 
> 
> I am processing all my algorithms in a standard eCos thread. 
> 
> What is the default cycle time for threads in eCos platform ?
>
> For example is it possible to process one Rx frame in a high priority task
> thread in 4 ms ? ( Of course it depends on the length of frame however the
> question is ; is it possible to process less than 10 msec or a thread in
> eCos steps in every 10msec ? )

You are talking about round robin scheduling of multiple threads on
the same priority. The timeslice defaults to 5 ticks, but is
configurable. See CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS. Normally 1 tick
is 10ms but that is also configurable. 

eCos is premptive, so if a higher priority thread becomes runable it
will run till it blocks. Only then will any lower priority threads
run.

Does that answer your question?

        Andrew

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