IUnityEventQueue - how do I use it?

I am currently writing a C++ native plugin for my Unity application. I've came across the IUnityEventQueue.h file in the UnityPluginAPI folder, but documentation is pretty thin on the ground - do some docs and/or examples exist for writing native plugins that use it? What I want to do is; issue an event from my *Unmanaged* code that is then picked up on the Unity main thread in *Managed* code - is this possible? Currently I am achieving this with Unmanaged->Managed callbacks, but I would prefer to use a more robust solution if one exists. From the comments in the IUnityEventQueue.h file, this sounds like it may be possible, but there are no examples of how to achieve this.