DFSMSdss Dynamic Exit (ADRDYEXT

The ADRDYEXT_EXIT1 dynamic exit uses the dynamic exits service, CSVDYNEX, which is described in z/OS MVS Programming: Authorized Assembler Services Reference ALE-DYN. Using this service, the ADRDYEXT_EXIT1 dynamic exit has been defined to allow multiple exit routines to be invoked, to process the functions that the dynamic exit supports. The ADRDYEXT_EXIT1 dynamic exit will support functions related to data set notification related events. This includes:

Closing allocated file systems. An exit routine will gain control to determine if any action needs to be taken for a data set for which serialization cannot be performed because the data set was allocated and the SMS management class for class transition specified USEREXIT to indicate that the dynamic exit should be invoked.

Using this facility, the system provides a dummy exit routine, ADRDYX01, which is defined to be called when the ADRDYEXT_EXIT1 dynamic exit routine is invoked by the system. A sample version of this dummy exit routine is provided in the SAMPLIB as member ADRDYXS1. This exit routine can be replaced with installation code, or installations can associate their own exit routines with this dynamic exit. For more details, see the "Adding an Exit Routine to an Exit" chapter in z/OS MVS Programming: Authorized Assembler Services Reference ALE-DYN.

Each defined exit routine to the ADRDYEXT_EXIT1 dynamic exit will be called when the dynamic exit is called by the system. Since the dynamic exits facility allows multiple exit routines to be simultaneously defined to a single exit, coordination of processing between these exit routines is necessary.