IBM C28-6628-3 OS Rel 17 System Control Blocks Nov68 free download

File name C28-6628-3_OS_Rel_17_System_Control_Blocks_Nov68.pdf

File No. 5360-36 Form C28-6628-3 OS Systems Reference Library IBM System/3S0 Operating System System Control Blocks This publication shows the formats of the major control blocks and tables used by more than one component of the System/360 operating System con- trol program. Descriptions of each field within the control blocks or tables follow each format illustration. The system control blocks described in this publication will be changed by IBM from time to time to extend the capabi1ities of the operating system. Programs should refer to these control blocks only through the system macro instruction facilities provided in the operating system. (For example, a field of the Data Control Block shou1d only be referred to by use of the DCBD macro instruction.) Programs that refer to the contr01 blocks by other means do so at the risk of not executing correctly in the future. Preface This publication contains reference The reader of this manual must be famil- information about the contents and format iar with the following publications: of system control blocks. Most of the con- trol blocks covered in this publication are used by more than one component of the IBM System/360: Principles of Opera- System/360 operating System control pro- tion, Form A22-6821 gram. A diagram of each block is followed by descriptions of its fields. The block descriptions are ordered alphabetically by IBM System/360 Operating System: Intro- acronym. When a block has different access duction, Form C28-6534 method versions, they are arranged under the block name in this order: SAM, I SAM, DAM, TAM, GAM. IBM System/360 Operating system: Con- cepts and Facilities, Form C28-6535 The pointer diagram previously shown in this publication has been superseded by a similar one now shown in the IBM publica- IBM System/360 Operating System: Super- tion IBM System/360 Operating System: Pro- visor and Data Management Services, Form grammer's Guide to Debugging, Form C28-6646 C28-6670. Fourth Edition (November, 1968) This is a major revision of, and obsoletes, C28-6628-2 and Technical Newsletter N28-2360. The changes in content made in this edition for this release are enumerated in a summary of revisions which follows the table of contents. Changes to the text, and small changes to illustrations, are indi- cated by a vertical line to the left of the change; changed or added illustrations are denoted by the symbol