Overview of functions

This table provides an overview of the functions offered by DSSM/SSCM, and shows which operands may be specified for the individual subsystem classes.

Function (operands)	TPR SAR	TU SAR	TU BAR	Sys- exits	Share Prod.	PU
Subsystem declaration (SSCM) statement SET-SUBSYSTEM-ATTRIBUTES
Identification
SUBSYSTEM-NAME, VERSION,-DYNAMIC-CHECK- ENTRY	X	X	X	X	X
Linking and loading
LIBRARY, REP-FILE, LINK-ENTRY, AUTOLINK,- UNRESOLVED-EXTERNALS	X	X	X	X	X
CREATION-TIME=*BEFORE-DSSM-LOAD/ *AT-DSSM-LOAD/*BEFORE-SYSTEM-READY	X			X
CREATION-TIME=*AFTER-SYSTEM-READY/ *AT-CREATION-REQUEST	X	X	X	X	X
CREATION-TIME=*AT-SUBSYSTEM-CALL	1
REFERENCED-SUBSYSTEMS	2	2	2	2	2
Address space
MEMORY-CLASS=*SYSTEM-GLOBAL	X	X		X	10
MEMORY-CLASS=*=*LOCAL-PRIVILEGED			X		10
MEMORY-CLASS=*=*LOCAL-UNPRIVILEGED			X		10
MEMORY-CLASS=*=*BY-SLICE		X	X		10
SUBSYSTEM-ACCESS=*SYSTEM	X			X
SUBSYSTEM-ACCESS=*=*HIGH		X	X		X
SIZE			X		X
START-ADDRESS			3		3
Subsystem satellites
MESSAGE-FILE, SYNTAX-FILE	X	X	X	8	8
SUBSYSTEM-INFO-FILE	X			8
Starting and terminating
INIT-, STOPCOM-, DEINIT-, CLOSE-CTRL-routine,- INTERFACE-VERSION	X			X
Holder task for execution
RESTART-REQUIRED	X			X
Execution (operand SUBSYSTEM-ENTRIES=(...))
MODE=*LINK	X	X	X		X
MODE=*SVC/*SYS-EXIT/*ISL	X			X
CONNECTION-ACCESS=*SYSTEM	X			X
CONNECTION-ACCESS=*ALL		X	X		X
CONNECTION-SCOPE=*PROGRAM/*TASK/*FREE	X	X	X	X	X
CONNECTION-SCOPE=*CALL/*OPTIMAL	9
Subsystem configuration (SSCM) statements
ASSIGN-HOLDER-TASK	X	4	X		8
SET-SUBSYSTEM-ATTRIBUTES (Operand RELATED-SUBSYSTEMS)	X	X	X	X	X
SET-SUBSYSTEM-ATTRIBUTES (Operand REFERENCED-SUBSYSTEMS)	11	11	11	11	11
SEPARATE-ADDRESS-SPACE			5		5
Subsystem management (DSSM) commands
START-SUBSYSTEM, STOP-SUBSYSTEM,- HOLD-SUBSYSTEM, RESUME-SUBSYSTEM	X	X	X	X	X
ADD-/REMOVE-/UNLOCK-SUBSYSTEM,- SAVE-SUBSYSTEM-CATALOG						X
MODIFY-SUBSYSTEM-PARAMETER	X	X	X	X	X	X
Subsystem information (DSSM) commands
SHOW-SUBSYSTEM-ATTRIBUTES						X
SHOW-SUBSYSTEM-INFO						X
SHOW-SUBSYSTEM-STATUS	X	X	X	X	X
Global subsystem management (DSSM) commands
RELEASE-SUBSYSTEM-SPACE			6
SET-DSSM-OPTIONS	7	7	7	7	7	7

Table 5: Overview of DSSM functions

Key

TPR SAR	Privileged subsystems (only system address space)
TU SAR	Nonprivileged subsystems with system address space
TU BAR	Nonprivileged subsystems with user address space
Sys. exits	Relevant for system exits
Share prod.	Relevant for share products
PK	Privileged user ID for systems support (user ID with SUBSYSTEM-MANAGEMENT privilege)
X	Function available
1	Only for subsystems with SVC and/or ISL connection
2	Relations only from UAS to SAS
3	only for subsystems in class 6 memory
4	Holder task is required in system address space only for execution purposes
5	Required only for subsystems in the address space strip
6	Reservation for the nonprivileged address space strip or both strips can be canceled
7	Only for diagnosis and debugging
8	Only where appropriate
9	Only in conjunction with MODE=*SVC or MODE=*ISL
10	Depending on storage location in the address space
11	Should be reserved for subsystems in the same “family” (privileges, memory class, etc.)