[ECOS] need cdl help

Jonathan Larmour jifl@eCosCentric.com
Wed Apr 2 14:35:00 GMT 2003


Bart Veer wrote:
> 
>     Jifl> Actually it is a bit of a mistake. When the interface has no
>     Jifl> implementations, the requires will have no effect because
>     Jifl> the interface will then be inactive (in the CDL sense). So
>     Jifl> in practice this would permit no watchdog implementations.
> 
> No. By default interfaces have the data flavor, not bool or booldata,
> so they are always enabled. Hence the "requires" property is always
> active, whether it belongs to the package or to the interface. It can
> be argued that the "requires" property is more properly associated
> with the package or the interface. IIRC in an early implementation the
> "requires" property did have to belong to the interface, so much
> existing CDL will reflect that.

Hmm... I'm sure I remembered something about you saying *not* to use a 
requires within an interface for some reason like this. Am I thinking of 
something different but related? Perhaps it _was_ about using active_if in 
the parent package.

Jifl
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