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Re: Question
- From: Andrew Lunn <andrew dot lunn at ascom dot ch>
- To: Francesco Regazzoni <fregazzo at erasmus dot cdc dot polimi dot it>
- Cc: eCos Discuss <ecos-discuss at sources dot redhat dot com>
- Date: Tue, 5 Feb 2002 11:58:06 +0100
- Subject: Re: [ECOS] Question
- References: <3C5FCC0F.3DC6B96C@erasmus.cdc.polimi.it>
On Tue, Feb 05, 2002 at 01:11:59PM +0100, Francesco Regazzoni wrote:
> Dear anyone,
>
> We are two students. We read the user manual but we need some more
> detailed information about eCos, in particular, we would like to know
> how eCos manages dead-lines and how exactly work priority and event
> management, since we couldn't find them in the eCos manuals.
eCos is a soft real time system, not a hard real time system with a
deadline schedular. The default scheduler is a multi level queue with
round robin within a queue. So the scheduler will run a runnable
thread from the highest priority queue. If there are multiple runnable
threads in that queue, it round robins between them on each tick.
Andrew