[Tinyos-help] Difference between "async event" and "event"

[Eric Decker]

On Thu, Jul 2, 2009 at 10:25 AM, Rémi Villé <ville.remi at gmail.com> wrote:

> 2009/7/1 sofia aparicio <apariciosofia at hotmail.com>
>
>>
>>  Hello,
>>
>> Could you please tell me the difference between "async event" and "event"?
>>
>> When a "event" is executed?
>>
>
> I  think you should look at section "4.5 Concurrency" of TinyOS Programming
> -> http://csl.stanford.edu/~pal/pubs/tinyos-programming.pdf
>
> I'm not really sure, but I think async event is a hardware or deep system
> event which can preempt any other running task of your application.
>

In practice async stuff typically is generated from a h/w interrupt.
 Labeling a command or event async tells the compiler that it is callable
from that
context.  The compiler uses this information to check references to data
cells and yells if a data cell is accessed from different contexts.

eric


>
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-- 
Eric B. Decker
Senior (over 50 :-) Researcher
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC
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