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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
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