You both misunderstand the concept of "return". You cannot mix wait and return.

The first possibility is that sql_get_rows immediately returns a value. In this case iResults has a meaningful value and waiting may either happen forever (because sql_get_rows returned -1) or may not happen at all (because sql_get_rows returned something different).

The second possibility is that sql_get_rows does not return anything. In this case iResults is either random or remains at -1. I don't know. try it if you're interested.

Regardless of the possibilities described above iResults will never change afterwards so that the while loop is pointless.