The notation int add(int a,int b) {return a+b;} has the disadvantage that it gets one to jump to the conclusion that add has non-atomic semantics where it waits - under the covers - for a and b to arrive before running. In my mind, at a very atomic level, a and b can arrive at separate times, hence add must react separately to each arrival. If add wants to see an a followed by a b, it must explicitly specify this condition in its code. I learned about state machines in electrical engineering and, that is the obvious answer, in my mind, of how to specify such conditions.
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