CONTROL BLOCK NAME = DFHWSRDS
NAME OF MATCHING PLS CONTROL BLOCK = None
DESCRIPTIVE NAME = CICS TS (XRF) - CAVM Surveillance
Communications Area
Licensed Materials - Property of IBM
Restricted Materials of IBM
5655-Y04
(C) Copyright IBM Corp. 1985, 1990
FUNCTION =
The Surveillance Communications Areas are needed to allow
the 4 independent CAVM surveillance processes (2 status
writers and 2 status readers) to share some common data.
In each XRF system, there are separate Surveillance
Communications Areas referring to each actual or potential
partner XRF system as well as a single Surveillance
Communications Area referring to that system itself.
The Status Record Header contains a TOD clock reading used
in clock difference calculations and a sequence number used
to determine which of two status records contains the more
up-to-date information. It is built immediately before
writing an XRF system's status to its Status CI in the
CAVM Control Data Set or Message Data Set.
LIFETIME =
All the Surveillance Communications Areas in a given XRF
system are created at the same time during CAVM SIGNON by
DFHWSSN2.
STORAGE CLASS =
Non-CICS storage. In MVS subpool 0 above 16M line.
LOCATION =
Field WSADSRCP in each Public Status Area Descriptor (WSAD)
contains a pointer to the corresponding XRF system's
Surveillance Communications 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 |
SRHEADER |
Status Record Header |
| (0) |
DBL WORD |
8 |
SRHTOD |
Latest TOD clock reading |
| (8) |
FULLWORD |
4 |
SRHSEQ# |
Sequence number of Status Write |
| (8) |
.... 11.. |
|
SRHEADRL |
"*-SRHEADER" Length of Status Record Header |
| (8) |
.... 11.. |
|
SRHWSAS |
"*" Start of common shared section of Status (WSAS) |
Table 2.
| Offset Hex |
Type |
Len |
Name (Dim) |
Description |
| (0) |
STRUCTURE |
0 |
SRVCOM |
Surveillance Communications Area |
| (0) |
CHARACTER |
1 |
SRVCHBOD |
Indicator that 'heart-beat overdue' NOTIFY has been issued |
| (1) |
CHARACTER |
1 |
SRVCSOFA |
Indicator that 'sign-off' abnormal NOTIFY has been issued |
| (2) |
CHARACTER |
1 |
SRVCSVCF |
Indicator that DFH6646 msg has been issued as a result of SVC failureL1A |
| (3) |
BITSTRING |
1 |
SRVCHBPM |
'Heart-beat' position mask showing which CAVM file is being read to track this partner's 'heart-beat' |
| (4) |
BITSTRING |
1 |
SRVCHBLM |
'Heart-beat' late mask showing which files have been read without finding this partner's 'heart-beat' |
| (5) |
BITSTRING |
1 |
SRVCIOEM |
I/O error mask showing which files have had an I/O error during the last read or write of this status CI |
| (8) |
FULLWORD |
4 |
SRVCLIHT |
TOD when most recent indication that this partner's 'INQUIRE HEALTH' exit had run was detected |
| (C) |
FULLWORD |
4 |
SRVCPBS# |
Status write sequence no. of Public Status |
| (10) |
FULLWORD |
4 |
SRVCLS#P |
Sequence no. of latest status read from or written to the control file |
| (14) |
FULLWORD |
4 |
SRVCLS#S |
Sequence no. of latest status read from or written to the message file |
| (14) |
...1 1... |
|
SRVCOML |
"*-SRVCOM" |