Gilles Chanteperdrix wrote: > Jan Kiszka wrote: > > Gilles Chanteperdrix wrote: > > > Jan Kiszka wrote: > > > > Gilles Chanteperdrix wrote: > > > > > IMO, the only advantage of having absolute timers is to be able to > apply > > > > > the posix scheme. So, if I followed correctly your discussion, what > we > > > > > need is: > > > > > - an XNTBISOL flag with a service xntbase_isol which set this flag > and > > > > > unshare the target timebase if it is shared (IOW, if aperiodic) > > > > > - the service xntbase_adjust_time to walk all the absolute timers > of the > > > > > non isolated timebases and adjust their expiry date or play their > > > > > handler the posix way. > > > > > > > > Two questions came up here regarding item #2: > > > > > > > > - Shouldn't we also adjust the non-monotonic timers of an isolated > base > > > > if it asks for wallclock tuning? I think so. > > > > > > > > - We don't have a service to walk the list of all pending timers, do > > > > we? As that touches all of our timer queue variants and I'm not > > > > familiar with their details (except for plain lists...), I would > > > > welcome any support on this. > > > > > > I am afraid for other things than lists, we will have to define an > > > xntimerq_iterator which holds a little bit more information than just a > > > pointer to a holder. > > > > > > > So we would have to increase the size of each xntimer_t object? Argh. > > > > Sounds a bit like it's worth to have a closer look at some "two timer > > lists, one with adjustable offset"-approach... > > No, I was thinking about defining a new type xntimerq_iterator, whose > sole purpose would be to hold the state of an iteration. In fact, we > only need this in the hashed case, binary heap holders already contain > enough information. >
OK, if that will not have negative impact on existing code, so much the better. Meanwhile I uploaded my current patch stack to http://www.rts.uni-hannover.de/rtaddon/patches/xenomai. I'm going to comment on detail aspects later. Just so much: it /should/ be finished except for the yet empty placeholder re-adjust-timers.patch. Jan
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