In some case (like threading / synchronization issues on Windows), C++ modules need to do some cleanup before the DLL gets unloaded per say (and before stdlib's atexit() ).

In such cases, it would be handy if we could register for some sort of "finalize" callback. It's possible that "process.on('exit')" could work, however I'm not sure that it's easy to use for a C++ only module (?).