CONTROL BLOCK NAME = DFHTMSKT
DESCRIPTIVE NAME = CICS TS Table Manager Scatter Table.
Licensed Materials - Property of IBM
Restricted Materials of IBM
5655-Y04
(C) Copyright IBM Corp. 1992, 1995
FUNCTION =
The table management scatter table holds pointers to
directory elements for use by the Table Manager Program.
TMASKTx in the table management static storage area holds
the address of this area.
LIFETIME =
It exists for the duration of the CICS System.
Storage for the scatter table (for each CICS table supported
by the table manager) is allocated at CICS initialisation.
However, the table manager reserves the right to dynamically
rehash a scatter table when TMCOUNT (the number of table
entries) is greater than or equal to TMTRIGR (triger value
for rehash). During rehash, storage (above the 16M line) is
acquired for the new hash table, and storage used by the old
hash table is released.
STORAGE CLASS =
Shared storage above the 16M line.
LOCATION =
Pointed to by TMASKTx in the table manager static storage.
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 |
* |
SKTTBLE |
Scatter table |
Standard header
|
| (0) |
CHARACTER |
20 |
SKTHDR |
Standard header |
| (0) |
FULLWORD |
4 |
SKTLNTH |
Total length of table |
| (4) |
CHARACTER |
1 |
SKTARRW |
Eye-catcher part 1: > |
| (5) |
CHARACTER |
3 |
SKTDFH |
Eye-catcher part 2: DFH |
| (8) |
CHARACTER |
2 |
SKTTM |
Eye-catcher part 3: TM |
| (A) |
CHARACTER |
8 |
SKTEYEC |
Block id: 'SCATTER ' |
| (12) |
HALFWORD |
2 |
* |
Reserved |
Scatter table information
|
| (14) |
CHARACTER |
28 |
SKTINFO |
Scatter table information |
| (14) |
BIT(8) |
1 |
SKTFLAG1 |
Flag byte 1 |
| (14) |
1... .... |
|
SKTNUEA |
Non-unique entries allowed |
| (14) |
.111 1111 |
|
* |
Reserved |
| (15) |
BIT(8) |
1 |
SKTFLAG2 |
Flag byte 2 |
| (15) |
BIT(8) |
1 |
* |
Reserved |
| (16) |
UNSIGNED |
1 |
SKTTTC |
Table type code |
| (17) |
UNSIGNED |
1 |
SKTTTCP |
Table type code for primary |
| (18) |
HALFWORD |
2 |
SKTDELN |
Directory entry length |
| (1A) |
HALFWORD |
2 |
SKTKEYLN |
Length of key |
| (1C) |
FULLWORD |
4 |
SKTMAXN |
Maximum number of entries |
| (20) |
ADDRESS |
4 |
SKTDIRSA |
First directory segment ptr |
| (24) |
ADDRESS |
4 |
SKTFDEA |
First directory element ptr |
| (28) |
ADDRESS |
4 |
SKTFRDE |
First free dir element ptr |
| (2C) |
FULLWORD |
4 |
SKTNUMDS |
# directory segments |
| (30) |
CHARACTER |
16 |
SKTRANGE |
GetNext Range-Table |
| (30) |
FULLWORD |
4 |
SKTRNG_NUM |
Number of ranges |
| (34) |
ADDRESS |
4 |
SKTRNG_ADDR |
Address of Range Table |
| (38) |
FULLWORD |
4 |
SKTRNG_SIZE |
optimal size of rngs |
| (3C) |
FULLWORD |
4 |
SKTRNG_USED |
Num of slots in use |
Scatter table pointers
|
| (40) |
ADDRESS |
4 |
SKTDIREA (*) |
Hash table ptr to dir elems |
Range table pointers
Table 2.
| Offset Hex |
Type |
Len |
Name (Dim) |
Description |
| (0) |
STRUCTURE |
* |
SKTRANGES |
Range Table |
| (0) |
CHARACTER |
8 |
SKTRNG_HEAD |
Buffer to spot errors |
| (8) |
CHARACTER |
8 |
SKTRNGE (*) |
Get Next Range Table |
| (8) |
FULLWORD |
4 |
SKTRNG_COUNT |
Num of elems in rng-1 |
| (C) |
ADDRESS |
4 |
SKTRNG_PTR |
Pointer to rng start |