IBM System/370 Operator's Reference Manual page 241

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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