[CCC DEV] Sleep (when time permits)

[Matt Jadud]

On Mon, Jun 13, 2011 at 13:00, Omer Kilic <omer at concurrency.cc> wrote:
> Yup. AVR datasheet, page 40 bottom paragraph states:

Ah. Yes. Documentation. I should read it. :)

> * https://projects.cs.kent.ac.uk/projects/kroc/trac/changeset/7218

Ah. Yes. Commits in a project I am a committer on. I should read those, too. :)

> Hmm, that would be nice as an optional thing I guess. When the processor
> wakes up it will continue where it left off though so we might have to force
> the stack pointer to where the wakeup function is before issuing a sleep
> command. Alternatively we can use a flag to check if we have woken up from
> sleep every time there is a context switch.

It would probably have to be something like the flag, and further,
we'd have to have a way of stuffing a magic wake/sleep PROC at the
front of the scheduler queue... which might not be ideal. In fact, it
would probably be rather dangerous... we'd be moving into a world
where there were "special" PROCs.

I think the second approach (just put it to sleep, and structure the
process network appropriately around the external interrupt wakeup) is
the way to go.

> I started working on it but didn't have time sadly. The beamer skeleton is
> in the repository.

That was a great kickstart, actually... it spared me having to do that
from scratch. I started throwing content in, and have some pretty
pictures for the first section or two now. I'll fill in more this
afternoon.

Cheers,
Matt