For keyed list structures allocated in a coupling facility of CFLEVEL=9 or higher, use KEYRANGESTATE=DEFINE to set or update the threshold counts that define the empty or not-empty state of a keyrange. KREMPTY and KRNOTEMPTY specify the values to be assigned as the empty and not-empty values. The not-empty value must be greater than the empty value. Key-range start and stop values are initialized to binary zeros when the structure is allocated. The keyrange for the list can be set with the IXLLSTC KEYRANGE=SET; starting and ending values of the keyrange are specified with KEYRANGESTART and KEYRANGEEND.

For structures allocated in a coupling facility at CFLEVEL=8 or lower, KEYRANGESTATE=DEFINE is ignored and the list empty and list not-empty threshold counts are always zero.

Use IXLLSTC REQUEST=MONITOR_KEYRANGE to register interest in monitoring transitions between key-range states.