Norman Vine writes:
> David Megginson writes:
> >
> > Norman Vine writes:
> >
> > > This should work fine, the only thing I am worried about is that it
> > > seems as if every sub component of FGFS is passing a double dt in
> > > both the initialization and the update function. Then locally
> > > storing a double elapsed variable to compare against.
> >
> > There might be some legacy code that does that, but nothing recent
> > should. The subsystem manager automatically takes care of minimum
> > time slices: for example, if you want to make sure that a subsystem is
> > never updated more than 5 times per second, you would just do this:
> >
> > globals->add_subsystem("my-subsystem",
> > new MySubsystem,
> > FGSubsystemMgr::GENERAL,
> > 0.2);
> >
> > The subsystem manager automatically takes care of the timeslice, and
> > will not invoke the subsystem's update method until at least 0.2
> > seconds has elapsed.
>
> Yes this is better but ... you are still checking every possible event
> at every iteration and doing a quadword add compare and store
> each time
>
> The event queue model is more efficient esp when you get many
> subsytems Linux's success as a RT platform has demonstrated
> this well :-)
Are you sure that's true? The event queue still needs to check every
event every iteration to see if anything is ready to run ...
Curt.
--
Curtis Olson IVLab / HumanFIRST Program FlightGear Project
Twin Cities curt 'at' me.umn.edu curt 'at' flightgear.org
Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org
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