IBM GY28-2018-3 Time Sharing System System Service Routines PLM Sep71 free download

File name GY28-2018-3_Time_Sharing_System_System_Service_Routines_PLM_Sep71.pdf

File No. S360-31 GY2S-201S-3 --..- - ---- - ----- ----- - - ____ ---- -. ----- 1'_ Program Logic Version 8.1 IBM System/360 Time Sharing System System Service Routines Describes the internal logic of the system service routine used in TSS/360. The system service routines are non-resident programs that can be invoked either directly by the user, through the use of system com- mands and macro instructions, or indirectly, in res- ponse to requests from other system components. The system service routines are divided into eight categories: catalog services; external storage allo- cation; device management; virtual memory allocation; small virtual memory allocation; symbolic library services; control section store; and serviceability aids. Appendixes describe VAM and SAM OSCB formats and catalog SBLOCK formats. This material is intended for persons involved in program maintenance, and system programmers who are altering the program design. It can be used to locate specific areas of the program, and it enables the reader to relate these areas to the corresponding pro- gram listings. Program logic information is not nec- essary for the use and operation of the program. Prerequisite Publications The reader must be familiar with the information presented in: IBM System/360 Time Sharing System: System Programmer's Guide, Ge2S-200S IBM System/360 Time Sharing s*stem: System Logic Summary PLM, GY2B-20 9 PREFACE This book describes the internal logic contains the flowcharts for all the of the system service routines used in routines. Appendixes include a module TSS/360. The system service routines are directory and descriptions of VAM and SAM divided into eight categories and each DSCB formats and catalog SBLOCK formats. category is discussed in a separate section of this book: The material in this book is intended 1. Catalog services for persons involved in program rr.aintenance, and system programmers who are 2. External Storage Allocation altering the program design. It can be used to locate specific areas of the 3. Device Management program and i t enables the reader to relate these areas to the corresponding program 4. Virtual Memory Allo