Re: [Flightgear-devel] Listener not firing, 10Hz nasal loop harmful?

[Patrick C. <pat...@gm...>]

How many property subscriptions at most can be serviced in one tenth of a
second?


On Tue, Jun 13, 2023 at 11:29 AM James Turner <ja...@fl...> wrote:

>
>
> > On 12 Jun 2023, at 20:46, TheFGFSEagle <the...@gm...> wrote:
> >
> > Oh great, could you explain it a bit, please ? I have no idea how it
> could work without storing a pointer to the node ! :mrgreen:
> >
>
> Well, you are right of course, but what I did was replace the simple
> pointer to the target node (which was already present in the size of
> SGPropertyNode), with a helper struct ‘AliasData’ which contains the target
> node and the listener pointer. So I replaced a pointer to one kind of
> thing, with a pointer to a slightly more sophisticated thing, no magic.
>
> This is the same pattern we use for listeners; the first time you add a
> listener to a property we allocate an extra struct to store the listeners
> and related info, so if you never add a listener at all, we only pay the
> cost of the empty pointer.
>
> In principle there’s a bit more of this kind of thing we could do, to put
> SGPropertyNode on a diet, but the disruption to the existing code would be
> high, so I’m not super keen on that.
>
> Kind regards,
> James
>
>
>
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