To perform a serialized DELETE_ENTRYLIST operation, one in which a lock operation is performed before performing a DELETE_ENTRYLIST request, specify the LOCKOPER parameter on the IXLLIST macro. If the list service cannot perform both the lock operation and the DELETE_ENTRYLIST operation, it performs neither and fails the request.

See LOCK: Performing a Lock Operation for detailed information about the LOCKOPER parameter.

If your serialization protocol permits lock stealing, you can use either of these lock operations to ensure that your delete request is performed only if the specified lock is in the state you expect.