Timing

You should be aware of the following possible events related to timing:

XCF does not notify the group user routines about every event. XCF skips some events, and the group user routines must be able to infer events if necessary. Examples appear in Events that Cause XCF to Schedule a Group User Routine and more detail is provided in Table 1.
Once a member issues IXCLEAVE or IXCQUIES, XCF no longer schedules the member's group user routine (XCF schedules the group user routines of active members only). If the group user routine is in control when IXCLEAVE or IXCQUIES is issued, the routine completes normally before the leave or quiesce service returns control.
When a member's group user routine receives notification that the member's system is about to be removed from the sysplex (event type GESYSPRT), the member should clean up any resources it is using, and issue IXCLEAVE or IXCQUIES as soon as possible.