[Tinyos-help] (yet another) Question about signal

[Philip Levis]

On Nov 14, 2007, at 10:39 AM, Michael Schippling wrote:

> OK, so I found
> 	nesC 1.1 Language Reference Manual (2003)
> and
> 	The nesC Language:... (2003)
>
> but in a quick search I don't find _what_ is the meaning of "signal",
> except that it seems to be prefixed to calling functions labeled  
> "event".
> Do I need to really read the whole thing to get the idea, or is there
> some summary that explains the hierarchy and impetus behind these  
> keywords?
> Or do I have to re-remember BNF?

http://www.tinyos.net/tinyos-2.x/doc/html/tutorial/lesson2.html:

Invoking an interface command requires the call keyword, and invoking  
an interface event requires the signal keyword. BlinkC does not  
provide any interfaces, so its code does not have any signal  
statements: in a later lesson, we'll look at the boot sequence, which  
signals the Boot.booted() event.

The impetus comes from a desire to articulate the bidirectional  
nature of interfaces. Providers of interfaces signal completion of  
split-phase operations.

Phil