Store a couple : function name + boolean so you can even provide information on which request is actually processing on a multi request process.
The benefit of this will be to Identify which one of the request is upon a time slow or not returning result.
Ex:
{[ req1:0, req2:1 req3:1 ]}
You'll know that req1 hasn't returned any result yet. With that simple int counter you loose that information, and won't be able to debug easily.