SFNDX

Prolog  

Control Block Contents  
   SFNDX DSECT

Storage Layout  

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)
          SFNCCEND       SFNSCNT        1022 NUMBER OF SLOTS
          SFNCCEND       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                         =
*     |                                                       |
*     +-------------------------------------------------------+
*
*** SFNDX - CHECKPOINT SPOOL FILE POINTERS

SFNDX Cross Reference

Symbol         Dspl Value
-------------- ---- -----
SFNASA         0008
SFNASATL       1000 SFNCCEND
SFNCCEND       1000
SFNSCNT        1000 SFNCCEND
SFNSIZE        1000 00000200
SFNTSTMP       0000