Your notify exit provides a mechanism for list services to inform you that contention exists for a lock you hold. When you issue the IXLCONN macro to connect to a serialized list structure, you must specify the address of a user-written notify exit using the NOTIFYEXIT parameter. It is possible that your notify exit might receive control before you receive control back from IXLCONN. Therefore, ensure that before you issue IXLCONN, you have the notify exit established along with any control structures necessary to complete the exit's processing.

Understanding Lock Contention and the Notify Exit explains in detail the role of the notify exit, the circumstances under which it receives control, and the actions it can take. This topic is limited to reference information for coding the exit.