[Tinyos-help] SplitControlPowerManagerC not checking errors (BUG?)

[Kevin Klues]

The existing component implements the lightweight policy decribed
here, and I made a modified version that does an endless task loop
this morning.  I can either check that one in as
EndlessRetryPowerManagerP or just leave it as is for now until a use
case for something like this comes up.

Kevin

On Thu, May 1, 2008 at 3:51 PM, Philip Levis <pal at cs.stanford.edu> wrote:
>
>  On May 1, 2008, at 2:43 PM, Vlado Handziski wrote:
>
> > This is where the modular architecture of the power locks comes to play. I
> think that the vanilla SplitControlPowerManager should retain a simple
> policy of either ignoring the FAIL events / not releasing the resource to
> the requester until it is sure that the device is on (a new request should
> result in a new retry by the PM to start the device, etc.) That being said,
> nothing prevent us from adding new policy in the form of a
> RetryingXXXPowerManager that contains logic (either an endless task loop or
> give up after N, etc.) to handle the retrying on behalf of the requester, so
> whenever the grant is issued it is guaranteed that the device is on.
> >
> > Vlado
> >
>
>
>  (cc'd to -devel)
>
>  That makes a lot of sense to me. This would allow simple drivers where
> there is no answer to FAIL to remain lightweight, while drivers that can
> have run-time failures and may benefit from a retry can pay the cost of a
> timer if needed.
>
>  Phil
>



-- 
~Kevin