same function called by events

[sarris]

Hi there. i have a wondering that might affect my application pretty much.
I have a function, lets call its

functionX(ByVal A() as byte)

I have as well three public subs that handle an event (when data is written on a specific com port) and they all three at some point might call functionX, with a different array of bytes each, as parameter.
Question: Is there a chance that functionX will be called by one of the subs, while its allready processing the data A() from previous call? Is there any possibility to have some kind of confusion of data there?

Thanks in advance