Buffering of events - to make it threadsafe

I am trying to familiarize myself sc, however I keep ending up with issues.

I have multiple threads that generate events and I am trying to buffer the events in a std::queue and have a thread call process_event with whatever is in the queue.

```
//typedef
typedef boost::statechart::state_machine::event_base_type VSEvent;
--
//queue def
std::queue> events;
--
//enqueue function
void HandleEvent(std::shared_ptr e);
```

Does this approach make sense at all - any references to thread safety would be great.

Besides, getting interactions with the outside world from the states seems non trivial. I have a static struct with thread safe getters and setters at the moment.