On Tue, Apr 24, 2012 at 10:06 AM, James Turner <zakal...@mac.com> wrote:
> It's probably a reference counting issue. FGAirport is a FGPositioned and
> hence reference counted. The Nasal Ghost is supposed to deal with this -
> when we create a ghost around the airport, we take a reference
> (SGReferenced::get) and when Nasal garbage-collects the ghost, the
> reference count is decremented. (SGReferenced::put)
>
> If the reference count hits zero, the airport will be freed, leading to
> the issue you see. But that would imply there's nothing else holding a
> reference to the airport, and that's not the case, because the the spatial
> index (the octree) in positioned.cxx holds a reference to everything at the
> moment.
>
> If I'd screwed up the ref-counting logic completely, I'd expect it to be
> crashing for me exactly the same, and it's not. Very weird.
>
> So likely I have made a subtle screw-up that only affects Linux. You could
> test this by commenting out the call to
>
> SGreferencd::put()
>
> in sgrefGhostDestroy - references will be leaked, but if it stops the
> crash then we can be sure it's a ref-counting bug.
Hi James,
Based on two runs with out crashing, that seems to prevent the crash ...
Curt.
--
Curtis Olson:
http://www.atiak.com - http://aem.umn.edu/~uav/
http://www.flightgear.org - http://gallinazo.flightgear.org
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