Partitioned data set: A data set divided into several members. Each member has a
unique name and
is
listed
in
a directory at the beginning of the data set. Members can
be added or deleted as needed. Records within members are organized sequentially.
path:
A series
of
segments
that
form
the
shortest distance
in
a region between a given
segment and the root segment.
physical
loeS:
Macro instructions and supervisor routines (Channel Scheduler)
that
schedule and supervise
the
execution of channel programs. Physical
lacs
controls
the
actual transfer of records between
the
external storage medium and real storage.
physical record: A record
that
is
defined
in
terms of physical qualities rather than by
the information it contains.
polling: A technique
by
which each of the terminals sharing a communications line
is
periodically checked
to
determ ine if it requ ires servicing.
post: Note the occurrence of an event.
private library (of a job step): A partitioned data set other than the link library
or
the
job library.
Private Second
Level
Directory (PSLD): The Private Second
Level
Directory
is
a table,
located
in
the
Supervisor and containing the highest phasenames found on the cor·
responding directory tracks of the Private Core Image Library.
privileged instruction: An instruction
that
can be executed only while the
CPU
is
in
the
supervisor state. Protection I/O, direct control, and any instructions
that
manipu·
late
the
program status words are privileged.
problem determination aids (PDAID): Programs
that
trace a specified event when it
occurs during the operation of a program. The traces provided are;
QTAM
Trace, 1/0
Trace, FIL Trace, and GSVC Trace.
problem program: Any program
that
is
executed when the central processing unit
is
in
the
problem state;
that
is,
any program
that
does
not
contain privileged instructions.
This includes IBM-distributed programs, such
as
language translators and service programs,
as well
as
programs written by a user.
processing program:
1.
A general term for any program
that
is
not
a control pro·
gram. 2. Synonymous with problem program.
processor:
1.
• I n hardware, a data processor. 2
.•
I n software, a computer program
that
includes the compiling, assembling, translating, and related functions for a specific
programming language.
RPG
\I processor, FORTRAN processor. 3. Same
as
processing
program.
program event recording: A
System/370 feature
that
enables a program
to
be alerted
to
specific events. Abbeviated PER.
PSW
(program status word): A double word
in
main storage used
to
control
the
order
in
which instructions are executed, and
to
hold and indicate the status of the system
in
relation
to
a particular program.
PTF: Program Temporary Fix
q
qualified name: A data set name
that
is
composed of multiple names separated
by
periods (for example, TREE.FRUIT.APPLE).
qualifier:
All
names
in
a qualified name other than the rightmost, which
is
called the
simple name.
queue:
1.
A waiting line or list formed
by
items
in
a system waiting for service; for
example, tasks
to
be
performed or messages
to
be transmitted
in
message switching
system. 2. To arrange
in, or form, a queue.
queued access method: An access
method
that
automatically governs the movement
of
data between
the
program
USing
the access method and
input/output
devices. (The
primary macro instructions used are GET and PUT.)
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