BPQBK Back to Index page
 
Prolog 
Control Block Contents 
   BPQBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  BPQBK Prolog Top of page
 
 NAME       : HCPBPQBK
 DESCRIPTION: BUFFER PENDING QUEUE BLOCK
 DSECT      : BPQBK
 FUNCTION   : DESCRIBES A QUEUE OF BUFFERS TO BE PROCESSED
 LOCATED BY : TSDBPQP IN THE TSDBK
 CREATED BY : HCPBMSSP - START A BPQBK
 DELETED BY : HCPBMSTP - TERMINATE A BPQBK
 RELOCATION CONSIDERATIONS : None
 
 
  BPQBK Control Block Content Top of page
 

 BPQBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure BPQBK BUFFER PENDING QUEUE BLOCK 0000 0 Bitstring 1 BPQSTTYP FREE STORAGE INDICATOR 00000000 BPQFRE X'00' BPQFRE BPQBK IS FROM FREE STORAGE 00000001 BPQPAG X'01' BPQPAG BPQBK IS A REAL FRAME (PAGE) 0001 1 Bitstring 1 * RESERVED FOR FUTURE USE 0002 2 Signed 2 BPQDWSZ DOUBLE WORD SIZE OF BLOCK THIS FIELD IS ONLY USED WHEN THIS BLOCK IS CREATED FORM FREE STORAGE 0004 4 Signed 4 BPQPDBCT COUNT OF PENDING BUFFERS 0008 8 Address 4 BPQNXTOF POINTER TO FIRST BUFFER ON THE QUEUE (NEXT TO BE TAKEN OFF) 000C 12 Address 4 BPQNXTON POINTER TO NEXT AVAILABLE SLOT ON THE QUEUE (NEXT FILLED WHEN ADDING ON) 0010 16 Address 4 BPQLAST POINTER TO LAST FULLWORD OF QUEUE 00000003 BPQHSIZE (*-BPQBK+7)/8 SIZE OF THE HEADER PORTION OF BPQBK IN DOUBLEWORDS 0014 20 Address 4 BPQSTART (0) START OF PENDING BUFFERS
 
 
  BPQBK Storage Layout Top of page
 
          
*** BPQBK - BUFFER PENDING QUEUE BLOCK
*
*     +------+------+-------------+---------------------------+
*   0 |:STTYP|//////|  BPQDWSZ    |         BPQPDBCT          |
*     +------+------+-------------+---------------------------+
*   8 |         BPQNXTOF          |         BPQNXTON          |
*     +---------------------------+---------------------------+
*  10 |         BPQLAST           |
*     +---------------------------+
*
*** BPQBK - BUFFER PENDING QUEUE BLOCK
 
 
  BPQBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
BPQDWSZ        0002
BPQFRE         0000 00000000
BPQHSIZE       0010 00000003
BPQLAST        0010
BPQNXTOF       0008
BPQNXTON       000C
BPQPAG         0000 00000001
BPQPDBCT       0004
BPQSTART       0014
BPQSTTYP       0000
 
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:53:55 EDT.
Copyright IBM Corporation, 1990, 2013