Hi Robert,
On 2/6/09 12:49 PM, Robert Osfield wrote:
Nothing special should be required when removing a PageLOD database
from the scene graph. One should just need to take the usual care
about threading.
Okay thanks.
The fact that you are getting a crash in osgTerrain
does suggest that the DatabasePager thread is trying to do something
on a scene graph that it doesn't have a reference to, but what code
this might be I just can't say without at least a stack trace.
I managed to get one :-)
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0xc0000000
[Switching to process 14997 thread 0xc903]
0x945f4a03 in __dynamic_cast ()
(gdb) where
#0 0x945f4a03 in __dynamic_cast ()
#1 0x1c169f73 in osgTerrain::TerrainTile::traverse ()
#2 0x0347fea3 in osg::NodeVisitor::traverse ()
#3 0x03493aa6 in osgDB::DatabasePager::FindCompileableGLObjectsVisitor::apply
()
#4 0x036c495b in osg::NodeVisitor::apply ()
#5 0x1c16e15f in osgTerrain::TerrainTile::accept ()
#6 0x036a8f94 in osg::NodeAcceptOp::operator() ()
#7 0x036a960d in std::for_each<__gnu_cxx::__normal_iterator<osg::ref_ptr<osg::Node>*,
std::vector<osg::ref_ptr<osg::Node>, std::allocator<osg::ref_ptr<osg::Node> > > >,
osg::NodeAcceptOp> ()
#8 0x036d292c in osg::PagedLOD::traverse ()
#9 0x0347fea3 in osg::NodeVisitor::traverse ()
#10 0x03493aa6 in osgDB::DatabasePager::FindCompileableGLObjectsVisitor::apply
()
#11 0x036c495b in osg::NodeVisitor::apply ()
#12 0x036c4b37 in osg::NodeVisitor::apply ()
#13 0x036c4b59 in osg::NodeVisitor::apply ()
#14 0x036d46cd in osg::PagedLOD::accept ()
#15 0x03675a7f in osg::Group::traverse ()
#16 0x0347fea3 in osg::NodeVisitor::traverse ()
#17 0x03493aa6 in osgDB::DatabasePager::FindCompileableGLObjectsVisitor::apply
()
#18 0x036c495b in osg::NodeVisitor::apply ()
#19 0x03677845 in osg::Group::accept ()
#20 0x03478f8b in osgDB::DatabasePager::DatabaseThread::run ()
#21 0x02c2af1c in OpenThreads::ThreadPrivateActions::StartThread ()
#22 0x97037155 in _pthread_start ()
#23 0x97037012 in thread_start ()
are there any special steps involved to unload a PagedLOD database?
What I want to do is release the main memory and OpenGL resources associated
with a PagedLOD.
My setup is roughtly the following:
- osgViewer::Viewer in single-threaded mode
- rendering is triggered on-demand by calling 'viewer->frame()'
- osg::Group* sceneNode and osg::Node* modelNode (both as osg::ref_ptr)
- to release the model I call sceneNode->removeChild(modelNode) and then set
modelNode = 0 to invalidate the ref_ptr
- after that the frame draw is not triggered anymore.
This works *most* of the times but I sporadicly get a crash in
osgTerrain::traverse which appears like there is some thread still running
on the database.
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