|
Programming Interface Information:
This information is NOT
intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only. |
DCHBK
Cross Reference (Contains links to field and bit definitions)
DCHBK Prolog
NAME : HCPDCHBK
DESCRIPTION: Diagnose Control Header
STATUS : VM/ESA Version 2, Release 1.0
DSECT : DCHBK
FUNCTION : The Diagnose Control Header serializes use of the
diagnose control block locator array, as well as
locates the diagnose control block locator array.
LOCATED BY : SYSCM.SYSDCHBK
CREATED BY : HCPHVAIN
DELETED BY : None.
REFERENCES : None.
SERIALIZED : The DCHBK is created during system initialization;
no further serialization is required.
The DCHLOCK is obtained exclusive in order to
serialize additions to the array of addresses of
DGNBKs. Since an address in the array is never
deleted, there is no conflict between searching and
adding. Therefore, there is no need to obtain the
DCHLOCK for searching.
DCHBK Control Block Content
DCHBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DCHBK Diagnose Control Header 0000 0 Dbl-Word 8 DCHLOCK (3) Lock for serializing actions on the DCHDGNIX array of addresses. 0018 24 Address 4 DCHDGNIX Address of the array of addresses of DGNBKs. 001C 28 Address 4 * Reserved 0020 32 Dbl-Word 8 DCH$END (0) The end
DCHBK Storage Layout
*** DCHBK - Diagnose Control Header * * +-------------------------------------------------------+ * 0 | | * = DCHLOCK = * | | * +---------------------------+---------------------------+ * 18 | DCHDGNIX |///////////////////////////| * +---------------------------+---------------------------+ * 20 | | * = DCH$END = * | | * +-------------------------------------------------------+ * *** DCHBK - Diagnose Control Header
DCHBK Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----DCH$END 0020
DCHDGNIX 0018
DCHLOCK 0000
Last updated on 3 Aug 1999 at 11:49:53 EDT.
Copyright IBM Corporation, 1990, 1999