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File No. S360-29
Form Y28-6801-4
Program Logic
IBM System/360 Operating System
PL/I Subroutine Library
Program Logic Manual
Program Number 360S-LM-St2
This publication describes the internal speci-
fications of the PL/I Subroutine Library as a
system component of IBM System/360 Operating Sys-
tem. The relationships between the code produced
by the PL/I (F) Compiler, the PL/I Library modules
and the control program are described, and summar-
ies of the properties of individual modules are
provided. This information is intended for use by
those involved in program maintenance and by
system programmers who are altering the program
design. Program logic information is not neces-
sary for the use and operation of the program:
therefore, distribution of this publication is
limited to those described above.
Restricted Distribution
RESTRICTED DISTRIBUTION: This publication is intended primar-
ily for use by IBM personnel involved in program desi9n and
maintenance. It may not be made available to others w~thout
the approval of local IBM management.
r-----------------------------------------------------------,
IFifth Edition (November, 1968) I
I I
IThis is a major revision of, and obsoletes, Y28-6801-3 and I
I Technical Newsletter Y33-6001. A new section has been I
ladded in Chapter 5 on multiprocessing and in Chapter 6 onl
linterrupt handling for the System/360 Model 91. Other I
Ichanges to the text, and small changes to illustrations, I
lare indicated by a vertical line to the left of the I
I change: changed or added illustrations are denoted by the I
I- symbol to the left of the caption. I
I I
IThis edition applies to Release 17, of IBM System/3601
IOperating System, and to all subsequent releases until I
1otherwise indicated in new editions or Technical News-I
I letters. Changes are continually made to the specifi-I
Ication herein: any such changes will be reported in sub-I
L___________________________________________________________ JI
Isequent revisions or Technical Newsletters.
Requests for copies of IBM publications should be made to
your IBM representative or the IBM branch office serving your
locality.
Address comments concerning the contents of this publication
to IBM United Kingdom Laboratories Ltd., Programming Publica-
tions, Hursley Park, Winchester, Hampshire, England.
C Copyright International Business Machines Corporation 1966,
1967,1968
PREFACE
This publication describes the object- system control Blocks, Form C28-6628
time PL/I Library package which forms an
integral part of the PL/I processing
system. General information covering the supervisor and Data Management Servi-
overall design and conventions is provided ~" Form C28-6646
as well as information specific to the
various areas of language support.
supervisor and Data Management Macro
The publication is intended primarily Instructions, Form C28-6647
for technical personnel who wish to under-
stand the structure of the library in order
to maintain, modify" or expand the PL/I PL/I(F) Compiler. Program Logic Manual,
processing system. Form Y28-6800
Information relevant to this manual is PL/I Lanquaqe specifications, Form
contained in the following IBM publica- Y33-6003
tions:
The publication includes two introducto-
IBM System/360 : Principles of Operation" ry chapters, 'The PL/I Library' and
Form A22-6821 If General Impl ementation Feat ures' , which
contain a general description of the
IBM System/360: PL/I Reference Manual, library as a component of IBM System/360
Form C28-8201 Operating System, and general notes on
features of the operating system and the
IBM 'System/360 Operating System: PL/I (F) Compiler that are used in the
library implementation,. The remainder of
Assembler Language" Form C28-6514 the manual describes the design of the
library modules in relationship to PL/I
Introduction, Form C28-6534 language features, and indicates the use
that is made of the control program to
Concepts and Facilities, Form C28-6535 support the design.
Linkage Editor, Form C28-6538
The descriptive material is supported by
Job Control Language, Form C28-6539 a set of module description summaries and
several appendixes. The module summaries
system Programmer's Guide, Form indicate the salient features of individual
C28-6550 modules in the library package, and act as
guides to the program listings that are
system Generation, Form C28-6554 available as part of the PL/I Library
distribution. The appendixes contain
PL/I Subroutine Library Computational details of the system macro instructions
Subroutines~ Form C28-6590 used, system generation, library pseudo-
registers and macro instructions, library
PL/I (F) Programmer's Guide, Form internal error codes and associated
C28-6594 messaqes. and PL/I control blocks.
coN'l'ENTs
CHAPTER 1: THE PL/I LIBRARY