Won't that make multiple copies of the 'global' function,
with module specific extended names, in the final code?
MS
Kevin Klues wrote:
Again, bad style, but there's nothing really preventing you from just
creating a c-style function in a header file, and then #including it in
any component you wish to use it in.
You can even declare it in a header file, #include that file in any
components you wish to use it, and then implement it within the body of
one of your TinyOS modules so that it will have access to the variables
defined in that module. To go this route, you need to add some nesC
attributes to your function definition though. Take a look at the
defintiion of uart_putchar() in tos/lib/printf/PrintfP.nc for an
example. And take a look at chapter 9 of the TinyOS programming Manual
to understand what these attributes are doing.
http://csl.stanford.edu/~pal/pubs/tinyos-programming.pdf
Kevin
On Dec 14, 2007 8:12 AM, Greg Hackmann < [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
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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~Kevin
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