How to properly shutdown osgEarth?

[MauFranco]

What is the correct way to manually shutdown osgEarth?
Looks like threads are only stopped at the application exit: std::atexit(JobArena::shutdownAll);
I need to shutdown osgearth but keep the application running.

Thanks in advance,

[MauFranco]

I think this is related: #1827 (comment)