1. A method, comprising: using a computer to perform: setting a watchpoint on a memory location that corresponds to a transactional variable, wherein the transactional variable is a variable that is accessed by one or more atomic transactions; detecting access, by an instruction within a given one of the one or more atomic transactions during execution of the given atomic transaction, to the watchpointed memory location; and in response to the detected access, interrupting execution of the given atomic transaction during execution of the given atomic transaction.