[maemo-developers] [maemo-developers] Maemo Alarm/Notifier Interface

[From: Nils Faerber]

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Andrew Flegg schrieb:
> On 11/01/06, Kimmo Hämäläinen <kimmo.hamalainen at nokia.com> wrote:
> 
>>I assume it will sleep most of the time and poll once in a minute
>>(according to man page).
> 
> Polling once a minute is much too often, though! The daemon (even if
> it's crond) should get told, possibly over DBUS, when a scheduled
> event is added. It then recalculates its sleep time, and goes back to
> sleep until the next currently known event is due.
> 
> Looking at the source to atd(8), this is what it seems to do.

In the hh.org atd for iPaq and friends we even make use of the RTC of
the StrongARM. This will be set to the next alarm and will cause an
interrupt when the event occurs.
This has two major advantages:
1. You do not have to poll and you do not have to trust that sleeping a
certain amount of time is accurate enough with the real time.
2. The RTC interrupt will wake up the machine when it is suspended thus
you get notified about events even if in suspend mode. I would suspect
that the OMAP has a similar RTC which is capable of generating a wakeup
interrupt.

In this case I would vote for atd again because the hh.org atd already
carries the necessary mods to make use of the RTC.

> Cheers,
> Andrew
Cheers
  nils faerber

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