gtpd3m0jLibrary Guide with Master Index and Glossary

G

GDS
General data set.

general data set (GDS)
An MVS BSAM data set that provides a data interface between offline and online system components; records are allocated sequentially; compatible with an MVS data set in the same module. The data set is allocated and initialized by MVS and is read and updated by the TPF system.

general file (GF)
A TPF general file is used to maintain one or more groups of logically related records organized in a sequential manner. It is created offline under MVS control but is not compatible with any MVS data structure. There are three types of general files: loader, pool, and recoup.

general file loader
A program that loads TPF components to the loader general file in order to initialize or update the online TPF system. The general file loader is capable of loading a complete set of the TPF system software (full load) or selected components (short load), but can only be used to copy items into image number 1. It consists of an offline and online portion; the offline portion creates the loader general file, and the online portion copies the contents of that file into the online modules of the TPF system. See also auxiliary loader and E-type loader.

general file pack
A disk pack that contains 1, 2, or 3 general file data sets.

general macros
Macros that provide system services (such as performing alphabetic scans, using tape drives, or handling input and output), control application programming processing (such as entry creation), and control events for resource sharing (such as posting and waiting, queuing and dequeing).

general tapes
Input and output tapes that allow an application to create consecutive files and scan records according to logical sequence. These tapes may be concurrently accessed by multiple ECBs, but are under the exclusive control of only 1 ECB at a given time.

general use C/C++ language header files
Header files that are available for general use and include function prototypes and related definitions that may be used by any application program.

get file storage (GFS)
A macro for requesting pool file addresses. For TPF collection support (TPFCS), the TPF system must have GFS pools enabled before the ZBROW and ZOODB commands can be used. The system must be cycled above CRAS state before pools are enabled.

GF
General file.

GID
Group ID.

global area
A portion of fixed main storage for storing critical, frequently accessed data. It provides efficient access by the control program or applications. Each global area is assigned a symbolic name, the first character of which is the @ character. Also referred to as globals.

global field
An addressable unit of storage in the global area.

global macros
The macros that allow applications to access and update data held in the global area.

global records
Blocks of data in the global area divided by function (type of data) or by the size of the physical file record from which the data is loaded into main storage.

globals
In TPF, the concept of shared, protected, system-allocated main storage designed to permit sharing of values between application and/or system components. See global area.

global symbol sharing
Global areas sharing global information throughout the system while restricting the number of areas where information resides.

global synchronization
The process where global fields and records shared by 2 or more active I-streams in a multiprocessor system (tightly coupled or loosely coupled) are dynamically maintained to contain the same values.

GMT
Greenwich mean time.

Greenwich mean time (GMT)
The time broadcast by the National Bureau of Standards. Also known as Universal Time, Coordinated (UTC).

group
A collection of users who can share access authorities for protected resources. (OSF)

group code
Term used to define the routing indicator or address that designates more than 1 receiver or terminal.

group ID (GID)
A nonnegative integer that is used to identify a group of related users.