Michiel Konstapel wrote:
>> I'm wondering whether I can define global function.
>> The global function mean, I define a function in
>> component A, and I can call this function in component
>> B without using interface, just call the function directly?
>
> No, all interaction between components has to go through the commands and
> events they define in their interfaces. Well, you could probably hack your
> way there, but you're not really supposed to.
Actually, you can have components provide and use commands and events
that aren't tied to any interfaces; e.g.:
module SomeComponentP {
provides command bool someCommand(uint8_t param);
}
implementation {
command bool someCommand(uint8_t param) {
...
}
}
This feature is used in a handful of places in TinyOS 2.0, like the
TOSSIM ActiveMessage layer. See
tos/lib/tossim/ActiveMessageAddressC.nc and
tos/lib/tossim/TossimActiveMessageP.nc for an example.
Doing this is arguably bad style, but it's possible nonetheless.
Greg Hackmann
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