On Fri, Jun 18, 2010 at 4:37 AM, Pedro Nunes <pmrnu...@gmail.com> wrote:
> Hi all.
>
> I have a non-generic module with an uint8_t array inside.
> That module has a command like this:
>
> command SomeModule.setValue(int something) {
> array[sim_node()] = something;
> }
>
> I was expecting that this array would be "global" for all motes and they
> would share it
>
I don't understand why you think "array" would be global within a mote let
alone across motes.
There is no nesc construct for declaring an object that is global across
multiple entities. nesc is a language extension built on top of C that
forces compartmentalization for systems design. It is only symantically
relevant to a module. There are no constructs in nesc for sharing global
objects across motes or for that matter across modules. The whole intent of
nesc is to provide a structure that forces very well defined interfaces
between components of a system.
> (although this is not what WSN's are supposed to do) -- but as far as I
> know about nesC, this was the expected behavior.
>
not sure why you are concluding that.
module globals are unique to a module. A module global is something like:
module exampleP {}
implementation {
uint32_t blah;
...
command SomeModule.setValue(uint32_t something) {
blah = something;
}
}
blah is global only to the module exampleP. It is not global to the mote
nor across the network.
Hopefully that clears things up.
eric
> Instead, I got each mote having its own array without sharing its content
> with any other mote.
>
> Could anyone please enlight me with a logical explanation on why is this
> happening?
>
> Regards,
> Pedro Nunes
>
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--
Eric B. Decker
Senior (over 50 :-) Researcher
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