On 24 Apr 2012, at 15:57, Curtis Olson wrote:
> I tried running with valgrind and the error didn't happen -- hmmm...
>
> Trying it again, but a valgrind startup is excruciatingly slow ...
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.
James
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Flightgear-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/flightgear-devel
