AXS Task
DMTAXS
VM/370 Spool File System
REX Task DMTCRE Create System
Service and
Line Driver
Tasks.
DMTMGX
Process Messages: • Build the Final Message Element. • Transmit File Message
DMTCMX
Process Commands: • Execute DMTCMX
Commands • Pass Command Elements to AXS and Line
Drivers for
Execution.
Line Driver Tasks A ... DMTREX • Handle all REX
Requests • Handle Program A. '--- Check Interrupts ..---- • Handle Console I/O • Terminate System
Service and Line
Driver Tasks l/--- N "I Supervisor Routines
Figure 14. program Organization for REX System Service Tasks RSCS Method of Operation and Program Organization BSC Line BSC Line
3-35

Figure 15. AXS Task (Mooule DMTAXS) CMDPROC • Reorder Files by Recording
the TAGs queued
to a Given Line
Driver • Purge Files
From RSCS • Change the
Attributes
Associated with
an RSCS File Open and Close Input and Output Files Accept Files from VM/378 Spoel System REX Task I DMTMSG I Line Driver
Tasks AXSCYCLE ACCEPT: I DMTMGX I • Files Spooled by Other Tasks I DMTREX I • Order, Change
Purge Command Elements • Requests to I DMTCRE I Open and Close VM/370 Spool Files. I DMTCMX I Supervisor Routines Prograa organization for the lIS Service Task
3-36 IBM VM/370: System Logic and Problem Deter.ination--Voluae 3 BSC Line BSC Line