NAME       : HCPSDBBK
 DESCRIPTION: ISFC Send Data Buffer block
 DSECT      : SDBBK
 FUNCTION   : Maintain information about an ISFC send data
              buffer for bunched send support on APPC/VM.
 LOCATED BY : HCPCMS    points to the mailbox entries.
 CREATED BY : HCPCMS    part of the resident data.
 DELETED BY : Does not apply (data contained within a module).
 SERIALIZED : The ISFC global lock (HCPBDSGL).
 RELOCATION CONSIDERATIONS : None

 SDBBK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SDBBK          ISFC Send Data Buffer block
      SDBBK management.
0000    0 Signed       4 SDBMDEQ        BUNCHED SENDDATA MDE QUEUE
0004    4 Signed       4 * (3)          Reserved
          00000010       SDBHDRSZ       *-SDBBK LENGTH OF HEADER IN SDBBK
0010   16 Dbl-Word     8 * (0)          ENSURE DOUBLE WORD ALIGNMENT
          00000010       SDBBFLST       * VARIABLE LENGTH BUFFER LIST OF
                                        ADDRESSES AND DATA LENGTHS


 SDBLSENT DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SDBLSENT       ISFC Send Data Buffer block
      SDBLSENT management.
0000    0 Signed       4 SDBLSADD       REAL ADDRESS OF LIST ENTRY
0004    4 Signed       4 SDBLSLEN       LENGTH OF LIST ENTRY
          00000008       SDBLSIZE       *-SDBLSENT SIZE OF ENTRY IN
                                        BUFFER LIST

          
*** SDBBK - ISFC Send Data Buffer block
*
*     +---------------------------+---------------------------+
*   0 |         SDBMDEQ           |///////////////////////////|
*     +---------------------------+///////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  10
*
*** SDBBK - ISFC Send Data Buffer block
          
*** SDBLSENT - ISFC Send Data Buffer block
*
*     +---------------------------+---------------------------+
*   0 |         SDBLSADD          |         SDBLSLEN          |
*     +---------------------------+---------------------------+
*   8
*
*** SDBLSENT - ISFC Send Data Buffer block

 
Symbol         Dspl Value
-------------- ---- -----
SDBBFLST       0010 00000010
SDBHDRSZ       0004 00000010
SDBLSADD       0000
SDBLSIZE       0004 00000008
SDBLSLEN       0004
SDBMDEQ        0000