Use IXLLSTC REQUEST=MONITOR_EVENTQ to start or stop monitoring an event queue to determine whether the queue is in an empty or not-empty state. Specify whether the event queue is to be monitored for state transitions of sublists identified by list entry key or for state transitions of sublists identified by secondary key.

If the structure is allocated in a coupling facility of CFLEVEL=9 or higher and has been allocated with secondary keys (IXLCONN KEYTYPE=SECONDARY), there are two event queues that can be monitored. The IXLLSTC KEYTYPE parameter (ENTRY or SECONDARY) designates which event queue is to be monitored. KEYTYPE=ENTRY specifes that the event queue for state transitions of sublists identified by list entry key is to be monitored. KEYTYPE=SECONDARY specifies that the event queue for state transitions of sublists identified by secondary key is to be monitored.

See MONITOR_EVENTQ: Monitoring an Event Queue for additional information about requesting event queue monitoring.