Messages in this thread | | | Date | Fri, 17 Sep 2010 14:08:03 +0300 | From | Alexander Shishkin <> | Subject | Re: [PATCH 1/7] notify userspace about time changes |
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On Fri, Sep 17, 2010 at 12:22:36 +0200, Kay Sievers wrote: > On Fri, Sep 17, 2010 at 12:33, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote: > >> Certain userspace applications (like "clock" desktop applets or cron) might > >> want to be notified when some other application changes the system time. It > >> might also be important for an application to be able to distinguish between > >> its own and somebody else's time changes. > > > > A program that cannot work out if it or someone else changed the time is > > very very broken indeed ! > > Yeah, that seems a bit weird to me too.
Ok, I get it. Filtering has to go.
> > Clocks apps don't care because they check the actual time so notice it > > shfited. Cron and anacron appear to contain the needed internal handling. > > Cron wakes up every minute to check if the time has changed. We don't > want such silly behavior, but there are no other options at the moment > for scheduling re-occurring events. > > > Anything sleeping until a time occurs maybe ? In which case its a lot > > simpler and cleaner than events to provide a new itimer which wakes the > > process when the wall time hits the time specified in the timer. > > That seems not sufficient. The details should be in the changelog of the patch.
Yes, I did include your description of the problem in the 0/7, but that doesn't seem sufficient. I really need to compile all the usecases from previous threads and include them in 1/7 as well.
Regards, -- Alex
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