|
Programming Interface Information:
This information is NOT
intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only. |
SFNDX
Cross Reference (Contains links to field and bit definitions)
SFNDX Prolog
NAME : HCPSFNDX
DESCRIPTION: CHECKPOINT SPOOL FILE POINTERS
DSECT : SFNDX
FUNCTION : To point to the first map page (SPMBK) for each
spool file in the system. The number of entries
in this table is determined by the size of the
warmstart area. Each 4K page on the warmstart
cylinder allows for 1022 entries, one for each
possible spoolid. If an entry contains a zero,
it indicates that the corresponding spoolid is
available for a new spool file.
LOCATED BY : The SFNDX entries occupy contiguous pages of
system virtual storage. The first page of the
SFNDX is pointed to by SYSVSNDX in SYSCM.
CREATED BY : The virtual pages reserved for the SFNDX
entries are cleared to zero when the system is
CLEAN started. They are reinitialized when
the system is WARM, FORCE, or COLD started
(only entries for system data files are
reinitialized for COLD starts).
During normal system processing, the SFNDX
entries are initialized by HCPSFSON when opening
a new spool file.
DELETED BY : When a spool file is deleted, HCPSFRDR zeroes
out the corresponding SFNDX entry. The storage
allocated for the SFNDX entries is never
deleted.
SFNDX Control Block Content
SFNDX DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SFNDX CHECKPOINT SPOOL FILE POINTERS 0000 0 Dbl-Word 8 SFNTSTMP TIMESTAMP INFORMATION 0008 8 Signed 4 SFNASA (1022) SPMBK POINTERS 1000 4096 Signed 4 SFNCCEND (0) 000003FE SFNSCNT 1022 NUMBER OF SLOTS 00000FF8 SFNASATL L'SFNASA*SFNSCNT Size of ASA area in bytes 00000200 SFNSIZE (*-SFNDX+7)/8 BLOCK SIZE IN DBLWDS
SFNDX Storage Layout
*** SFNDX - CHECKPOINT SPOOL FILE POINTERS * * +-------------------------------------------------------+ * 0 | SFNTSTMP | * +-------------------------------------------------------+ * 8 | | * = SFNASA = * | | * +-------------------------------------------------------+ *1000 | | * = SFNCCEND = * | | * +-------------------------------------------------------+ * *** SFNDX - CHECKPOINT SPOOL FILE POINTERS
SFNDX Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----SFNASA 0008
SFNASATL 1000 00000FF8
SFNCCEND 1000
SFNSCNT 1000 000003FE
SFNSIZE 1000 00000200
SFNTSTMP 0000
Last updated on 3 Aug 1999 at 12:31:22 EDT.
Copyright IBM Corporation, 1990, 1999