Adrian Hey wrote:
On Tuesday 30 Nov 2004 3:02 pm, Lennart Augustsson wrote:
I reiterate: not even device drivers written in C use TWIs. (Well, at least not quality drivers. :))
A finite pool of N devices is still a unique resource.
Ultimately you have to contain the problem locally with a modular solution, or all the unique state handle "buck passing" to higher levels (via who knows what intermediate modules) takes you all the way up to main.
This is technically feasible, but highly un-modular and certainly not a desirable characteristic of any programming language (at least not one whose use I would advocate).
It's not a language issue. It's a design issue. And in the case of device drivers you do want to pass the buck up to the layer that handles device drivers. Having each driver keep it's own global state is just broken. But you don't seem to believe this, so I'll let you discover it yourself. :) I agree with you that at some level there has to be a unique resource (for that computer), but it's not something I'd keep in a global variable. -- Lennart