Deleting an entry from an access list

Use ALESERV DELETE to delete an entry on an access list. The ALET parameter identifies the specific entry.

Access lists have a limited size; the DU-AL has 509 entries and the PASN-AL has 510 entries. Therefore, it is a good programming practice to delete entries from an access list when the entries are no longer needed. The specific rules are:

If a program needs an entry for a short period of time, it should delete the entry when it no longer needs the entry.
If a program adds an entry and uses that entry during execution, the program does not need to delete the entry; the system deletes the entry when the task terminates.
If a supervisor state or PSW key 0 - 7 program does not want the system to check the EAX-authority of the program when it deletes an entry for an address space, it should use CHKEAX=NO on ALESERV DELETE. CHKEAX=YES is the default.
Once the entry is deleted, the system can immediately reuse the ALET.

Programs that share data spaces with other programs have another action to take when they delete an entry from an access list. They should notify the other programs that the entry is no longer connecting the ALET to the data space. Otherwise, those programs might continue to use an ALET for the deleted entry. See ALET reuse by the system for more information.