Is there a way to get the asIScriptContext while handling a generic function call?

The asIScriptGeneric argument only gives me access to the asIScriptEngine. However, I want to get to the user data of the script context in which the function is executed.

Currently the only way that I see to achieve this, is to set a thread local variable before I call into AS.

The global function asGetActiveContext will give you the context that is calling the application function. It works in multithreaded environments as well.