which RSCS knows the task), the address of the line which is used by the link, and se on. The link table (a chain of LINKTAEL DSECTs) is built
during system generation and may be updatedty the DEFINE, DELETE, START, and DRAIN commands.
TAG:RSCS FILE DESCRIPTOR The TAG DSECT defines the attributes and status of a file being processed by RSCS. The TAG is built from information passed via the CF
TAG command (or its counterpart for remote stations) and from the CFSFool File Bleck (SFBLOK) that describes the file. RSCS REQUEST ELEMENTS Request elements are data tables built by task programs when a service is to be requested by the task.
For example, when a command is processed bytMTCMX, the command line may be formatted into ao command element, which gives the following types
of information:• Length of the command element • The unique code identifying the command element • The linkid to which command response is to be returned • Modifiers that specify options for a given command • A variable length buffer field containing the command line
This command element is then passed (viaD81SIG) to another task fer
processing.Other types of request elements are built to process individual
commands and messages, to create and terminate tasks, to process consoleI/O, and so on.
In many cases, elements are contained in a generalized control area
used when processing a system function, for example, monitoring requests
forDMTAXS module to open or close a V8/370 spool file. VM/370 DATA AREAS REFERENCED BY RSCS There are two V8/370 CP data areas referenced by RSCS when V8/370 spocl
files are processed:• SFBLOK The VM/370 spool file block that contains control information
and describes attributes of aVM/370 spool file. • SPLINK The data block that links pages of a VM/37C spool file buffer. RSCS Storage Requirements
Figure 7 shews the storage usedby the BSCS control program and how the parts of the system (the Supervisor, the tasks, and the data areas) fit
together in storage.3-20 IBM VM/370: System Logic and Problem Determination--Volume 3
during system generation and may be updated
TAG:
TAG command (or its counterpart for remote stations) and from the CF
For example, when a command is processed by
of information:
This command element is then passed (via
processing.
commands and messages, to create and terminate tasks, to process console
In many cases, elements are contained in a generalized control area
used when processing a system function, for example, monitoring requests
for
files are processed:
and describes attributes of a
Figure 7 shews the storage used
together in storage.