CONTROL BLOCK NAME = DFHWSCDS
NAME OF MATCHING PLS CONTROL BLOCK = None
DESCRIPTIVE NAME = CICS TS (XRF) - CAVM TOD Clock Difference
Control Area
Licensed Materials - Property of IBM
Restricted Materials of IBM
5655-Y04
(C) Copyright IBM Corp. 1985
FUNCTION =
A BACKUP system uses this control block to keep track of
the difference between the ACTIVE system's TOD clock and
its own when they are running in different CECs.
There is one instance of this control block per BACKUP.
LIFETIME =
DFHWSXPI creates this control block when a BACKUP system
signs on to CAVM and DFHWSTKV destroys it when the BACKUP
takes over from the ACTIVE.
STORAGE CLASS =
Non-CICS storage. In MVS subpool 0 above 16M line.
LOCATION =
Field WCGCKDA in the XRF Global Control Block (DFHWCGDS)
contains a pointer to the TOD Clock Difference Control Area.
INNER CONTROL BLOCKS =
None.
NOTES :
DEPENDENCIES = S/370
RESTRICTIONS =
None.
MODULE TYPE = Control block definition
--------------------------------------------------------------------
EXTERNAL REFERENCES =
None.
DATA AREAS =
None.
CONTROL BLOCKS =
None.
GLOBAL VARIABLES (Macro pass) =
None.
--------------------------------------------------------------------
Table 1.
| Offset Hex |
Type |
Len |
Name (Dim) |
Description |
| (0) |
STRUCTURE |
0 |
WSCKD |
TOD Clock Difference Control Area |
| (0) |
DBL WORD |
8 |
CKDLTMIN |
Current minimum estimate of amount by which ACTIVE's TOD clock is ahead of this BACKUP's |
| (8) |
DBL WORD |
8 |
CKDLTMAX |
Current maximum estimate of amount by which ACTIVE's TOD clock is ahead of this BACKUP's |
| (10) |
FULLWORD |
4 |
CKDTOD |
ACTIVE's TOD clock reading corresponding to the current deltas to permit compensation for relative gain or loss of TOD clocks |
| (10) |
.... 1.1. |
|
CKDSHIFT |
"10" Shift value corresponding to max. assumed relative rate of gain or loss of two TOD clocks (1 in 1024) |
| (14) |
CHARACTER |
12 |
CKDMVSI |
MVS instance (SMF ID, IPL time & date) to which clock difference refers |
| (14) |
..1. .... |
|
WSCKDL |
"*-WSCKD" |