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File Number S360-30 (OS)
Order Number GY28-6616-9




Program Logic




os I/O Supervisor Logic
Release 21

Program Number 360S-CI-505

This publication describes the input/output supervisor, which
consists of the control program routines that carryon input/output
activity for the IBM Operating System. Input/output supervisor
routines start, monitor, and, where necessary, restart activity on
input/ output devices. Hollowing an introduction, there is a Method
of Operation section in this publication which is organized to reflect
the sequence of events that takes place when the input/output
supervisor receives a request for input/output (I/O) activity:
Validating Input Data
Scheduling I/O Operations
Starting I/O Operations
Terminating I/O Operations
Restarting I/O Operations
Recording Error Data
The remaining sections of this publication support the Method of
Operation section, and include descriptions of program organization,
directories for PLM-to-listing and listing-to-PLM transitions,
descriptions of data areas, diagnostic aids, and appendixes.
This manual is intended for persons involved in program
maintenance, and system programmers who are altering the program
design. Program logic information is not necessary for the use and
operation of the program.
Page of GY28-6616-9
Revised April 30, 1973
By TNL GN26-8036




Tenth Edition (February 1972)

This edition, as amended by technical newsletter GN26-8036, applies to Release 7J'-:'z-0fthe
Operating System (OS) and to all subsequent releases until otherwise indicated in new
editions or technical newsletters.
Information in this publication is subject to significant change. Any such changes will be
published in new editions or technical newsletters. Before using the publication, consult the
latest IBM System/360 and System/370 Bibliography, GA22-6822, and the technical
newsletters that amend that bibliography, to learn which editions and technical newsletters
are applicable and current.
Requests for copies of IBM publications should be made to the IBM branch office that serves you.
Forms for readers' comments are provided at the back of the publication. If the forms have been
removed, comments may be addressed to IBM Corporation, Programming Center--Publishing,
Department D58, Monterey and Cottle Roads, San Jose, California 95193. All comments become
the property of IBM.