IBM System/360 System Programmer's Guide

THE RESIDENT BLDL TABLE AND RESIDENT ACCESS METHOD OPTIONS
These options, when included in an Operating System/360 configu-
ration, provide you with the capabilities of placing in the system
nucleus:
1. All, or any selection of linkage library directory entries (40
bytes per entry).
2. A selected group of access method routines.
Placement occurs during the initial program load (IPL) process. You
include either or both of these options when the system is generated.
Parameters for specification of these options are provided in the system
generation SUPRVSOR macro-instruction. Operator communication with
these options may also be specified.
System issued ATTACH, LINK, LOAD, or XCTL macro-instructions request-
ing load modules in partitioned data sets require direct-access storage
device accesses to search the data set directory for the location of the
requested module (the BLDL table operation) and to fetch the module.
The resident BLDL table option reduces the number of accesses required
during execution of these macro-instructions when a load module (whose
directory entry is resident) is requested from the linkage library. The
resident access method option eliminates such accesses during execution
of a system issued LOAD macro-instruction that requests any of the group
of resident access method routines.
You specify the linkage library directory entries and the access
method routines to be made resident through lists of linkage library or
access method load module names placed in the procedure library
(SYS1.PROCLIB). A standard list and alternative lists may exist for
each option. IBM provides a standard list for the resident access
method option. The stanaard lists are processed without operator
intervention when the operator communication facility is not included
with the options. When the operator communication facility is included,
the operator must indicate the action to be taken. Selection of
alternative lists may not be made unless the operator corrmunication
facility is included. The Operator's Guide publication describes the
messages and replies associated with the two options.
The balance of this chapter discusses the function of each option,
the creaticn of the procedure library lists, the use of the operator
communication facility, and, in Appendix A, lists the content of the
resident access method standard list.
~rHE RESIDENT BLDL TABLE OprION
This option builds, in the system nucleus, a list of linkage library
directory entries for use by ATTACH, LINK, LOAD, or XCTL macro-
instructions requesting linkage library load modules. During execution
of the BLDL operation in the ~acro-instruction routines, the linkage
library directory is searched only when the directory entry for the
~equested load module is not present in the resident BLDL table.
You list, in a member of SYS1.PROCLIB, the load module name of
linkage library load modules whose directory entries are to be made
resident. The member name for the standard list is IEABLDOO. Creation
of procedure library lists is discussed later in this chapter. The next
section provides gUidelines for choosing the content of the list.
~ote: Directory entries in the resident table are not updated as a
result of updating the load wodule in the linkage library. The old
116

IBM System/360 Specifications

General

Brand	IBM
Model	System/360
Category	Desktop
Language	English