OS/390

Your governor exit routine can cancel asynchronous commands when a timer is active in TSO or native OS/390.

To cancel QMF commands using asynchronous processing in TSO or native OS/390, the IBM-supplied governor uses a timer macro, which returns control to a timer routine. The timer routine tests whether to cancel the current command. If the command is to be canceled, it carries out the cancellation. The tests are based on processor time and the number of rows fetched for the current DATA object. The tests can also be based on the user's response to a cancellation prompt.