LKIWD Back to Index page
 
Prolog 
Control Block Contents 
   LKIWD 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.


  LKIWD Prolog Top of page
 
 NAME       : HCPLKIWD
 DESCRIPTION: Defer-lock (I/O) "Lockword"
 DSECT      : LKIWD
 FUNCTION   : Overlay for I/O defer type lock.
 LOCATED BY : N/A
 CREATED BY : N/A
 DELETED BY : N/A
 SERIALIZED : All the fields in this block must be serialized except
              LKICTRG, which is protected by the lock.
 RELOCATION CONSIDERATIONS : None
 COMMENTS   : This overlay is used by the following entry point(s):
              HCPIOLAX.
 
 
  LKIWD Control Block Content Top of page
 

 LKIWD DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure LKIWD Defer-lock (I/O) "Lockword" 0000 0 Bitstring 16 LKILCKW (0) Entire lockword 0000 0 Dbl-Word 8 LKILOCK (0) Owner & anchor of Lockword 0000 0 Address 4 LKILOWN Address of lock owner's VMDBK 0004 4 Address 4 LKITSKQ Anchor for queue of waiting tasks 0008 8 Signed 4 LKICTRG Count of granted lock requests 000C 12 Signed 4 LKICTRD Count of deferred lock requests 00000002 LKISIZE (*-LKIWD+7)/8 Size, in doublewords, of LKIWD
 
 
  LKIWD Storage Layout Top of page
 
          
*** LKIWD - Defer-lock (I/O) "Lockword"
*
*     +---------------------------+---------------------------+
*   0 |         LKILOWN           |         LKITSKQ           |
*     +---------------------------+---------------------------+
*   8 |         LKICTRG           |         LKICTRD           |
*     +---------------------------+---------------------------+
*  10
*
*** LKIWD - Defer-lock (I/O) "Lockword"
 
 
  LKIWD Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
LKICTRD        000C
LKICTRG        0008
LKILCKW        0000
LKILOCK        0000
LKILOWN        0000
LKISIZE        000C 00000002
LKITSKQ        0004
 
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:54:47 EDT.
Copyright IBM Corporation, 1990, 2013