QUEBK

Prolog  

Control Block Contents  
   QUEBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

QUEBK Prolog

 NAME       : HCPQUEBK
 DESCRIPTION: Queue Control Block
 DSECT      : QUEBK
 FUNCTION   : Control block used for inter-process communications via
              queues.
 LOCATED BY : HCPCMSDQ  contains the static QUEBK for the ISFC Deliver queue.
              HCPCMSRQ  contains the static QUEBK for the ISFC Resume queue.
              LNKQUEBK  contains the QUEBK for a Link queue.
              LNKIOQBK  contains the QUEBK for Link I/O.
              HCPAAKIQ  contains the QUEBK for the CPAP mailbox
 CREATED BY : Operation of the ACTIVATE ISLINK command.
 DELETED BY : Operation of the DEACTIVE ISLINK command.
 SERIALIZED : LNKBK lock or ISFC Global Lock.

QUEBK Control Block Content

QUEBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      QUEBK          Queue Control Block
      QUEBK management.
0000    0 Address      4 QUESTACK       Stack of LIFO work
0004    4 Address      4 QUEREADR       Address of reader routine to call
0008    8 Signed       4 * (2)          Reserve space for future routines
0010   16 Address      4 QUEHEAD        Address of first work element
                                        (FIFO)
0014   20 Address      4 QUETAIL        Address of last work element
                                        (FIFO)
0018   24 Signed       4 QUECHAIN       Offset to be used for chaining
                                        work
001C   28 Signed       4 *              Reserved
0020   32 Signed       4 QUEUWORD       Word reserved for use by queue
                                        owner
0024   36 Signed       4 QUEUWRD2       Another word for use by owner
0028   40 Signed       4 * (2)          Reserved
          00000006       QUESIZE        (*-QUEBK+7)/8 Size, in
                                        doublewords, of QUEBK

QUEBK Storage Layout

          
*** QUEBK - Queue Control Block
*
*     +---------------------------+---------------------------+
*   0 |         QUESTACK          |         QUEREADR          |
*     +---------------------------+---------------------------+
*   8 |///////////////////////////////////////////////////////|
*     +---------------------------+---------------------------+
*  10 |         QUEHEAD           |         QUETAIL           |
*     +---------------------------+---------------------------+
*  18 |         QUECHAIN          |///////////////////////////|
*     +---------------------------+---------------------------+
*  20 |         QUEUWORD          |         QUEUWRD2          |
*     +---------------------------+---------------------------+
*  28 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*  30
*
*** QUEBK - Queue Control Block

QUEBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
QUECHAIN       0018
QUEHEAD        0010
QUEREADR       0004
QUESIZE        0028 00000006
QUESTACK       0000
QUETAIL        0014
QUEUWORD       0020
QUEUWRD2       0024