Hello Pablo,
Pablo Carneiro Elias wrote:
> Hi, we're experiencing random access violations in our program under
> windows, and it seems to have something to do with OpenSG. We did this
> simple test:
>
> int main( int argc, char *argv[] )
> {
> bool init1 = OSG::osgInit( argc, argv );
> bool exit1 = OSG::osgExit();
>
> bool init2 = OSG::osgInit( argc, argv );
> bool exit2 = OSG::osgExit();
>
> return 0;
> }
sorry, but this tests does not allow many conclusions, because it is
fully expected to fail. OpenSG makes use a lot of static initialization
and (in order to reduce the amount of memory reported as being leaked)
tries to clean that up during osgExit. So once you call osgExit a lot of
the internal objects are lost and they can not be reocovered.
> This program crashes at the second osgExit() call. But if we comment this
> line, it crashes at the "return 0". If we comment the second osgInit(), then
> the program "works".
yes, the only surprise here is that it even makes it through osgInit ;)
> But in our real application we're experiencing a similar crash even though
> we only call osgInit() once (and don't even call osgExit()). If we remove
> nodes from the graph, the program will crash at random locations. I've
> already checked and both our program and OpenSG are use the same runtime
> libraries.
>
> Looks like memory corruption. Any clues?!
that is a possibility, my general bet would be that you have objects in
your scene that have actually been deleted already.
I'm really sorry but I don't know how to help you track this down other
than that you might want to run a traversal over the scene that prints
the reference count of the objects and look for those that have a zero
there.
The reference count can be obtained by calling a member function of the
pointer, i.e.
NodePtr p = Node::create();
p.getRefCount() // note . instead of ->
Hope it helps,
Carsten
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