Hi, i have encountered some similiar problems with multithreading (and the datavariance stuff).
One thing I have considered is changing the design of osg::Statesets and osg::StateAttribute to immutable classes. So once the stuff is created you can only change it by cloning it. At least for those objects you don't have to think about datavariance anymore. Attached you will find a 'setup' design pattern, which helps you spawning immutable objects. Richard PS.: Just an idea.
TestClass.cpp
Description: TestClass.cpp
TestClass.h
Description: TestClass.h
Test.cpp
Description: Test.cpp
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