Asynchronous statechart 

Hi,
I'm sorry for this question, but I need of an example of asynchronous statechart.
In english, I want to say that I need to execute the transition in reentrant way.
For example, if I have a state A and it posts an event to state B and this state B posts an event to state A, actually I got an error.
Do you think that asynchronous statechart resolve my problem?