Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

PDEBK

Prolog  

Control Block Contents  
   PDEBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  


PDEBK Prolog

 NAME       : HCPPDEBK
 DESCRIPTION: PATH DESCRIPTOR ENTRY
 DSECT      : PDEBK
 FUNCTION   : HOLDS INFORMATION ABOUT AN IUCV OR APPC/VM PATH.
 LOCATED BY : CCTPDSEG FIELD IN HCPCCTBK
 CREATED BY : HCPIUFGP FOR IUCV CONNECT AND APPCVM CONNECT
 DELETED BY : HCPIULSV FOR SEVER

 

PDEBK Control Block Content


PDEBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      PDEBK          PATH DESCRIPTOR ENTRY
0000    0 Signed       2 PDEMSGCT       CNT OF OUTSTANDING MSGS ON PATH
0002    2 Signed       2 PDETGPID       TARGET PATH ID
0004    4 Address      4 PDETGCCT       TARGET CCT ADDRESS
0008    8 Signed       4 PDETGLKA       TARGET IUCV LOCKWORD POINTER
000C   12 Bitstring    1 PDEFLAGS       STATUS
          1... ....      PDEVALID       X'80' VALID PATH
          .1.. ....      PDESEND        X'40' SEND ALLOWED ON THIS PATH
          ..1. ....      PDEPRTY        X'20' MAY INITIATE PRIORITY
                                        MESSAGES
          ...1 ....      PDEPRMD        X'10' MAY PUT DATA IN PARMLIST
          .... 1...      PDEPHELD       X'08' Path held by first invoker
     PDEVALID, PDEPEND1, PDEPEND2, and PDESERVD ( PEND1 + PDEND2) are the
     main flags used to indicate the status of one half of a path. The main
     combination's that will occur are
     PDEPEND1 on - The side of the path that has issued a CONNECT PDEPEND2
     on - The side of the path that will issue an ACCEPT PDEVALID on - This
     side of the path is fully established. PDEVALID + PDESEVRD on - Partner
     has severed their side.
     If see PDEPHELD + PDESEVRD on, indicates that a SEVER has occurred on a
     path where the original function that set PDEPHELD had to release the
     IUCV lock for a brief time
     PDEPHELD is set for two different reasons.
     First, when the IUCV or APPCVM code is making a a call to an ESM and
     has given up the Invoker's IUCV lock from IUCV CONNECT APPCVM CONNECT
     IUCV SEVER APPCVM SEVER Second, when IUCV ACCEPT is going for the
     partner's lock, PDEPHELD on protects the Acceptor's PDEBK.
     The purpose of PDEPHELD is to give the calling function control over
     the disposition of a PDEBK when PDEPHELD is ON.
          .... .1..      PDECNTRL       X'04' CONTROL PATH
          .... ..1.      PDEPEND1       X'02' INITIATED CONNECTION
          .... ...1      PDEPEND2       X'01' INCOMING CONNECTION
          .... ....      PDEZERO        X'00' PDEBK INVALID AND AVAILABLE
          00000003       PDESEVRD       PDEPEND1+PDEPEND2 ENTRY HAS BEEN
                                        SEVERED
000D   13 Bitstring    1 PDEAPPFL       APPC/VM FLAGS
          1... ....      PDEAPPC        X'80' APPC/VM PATH
          .1.. ....      PDEAPSCF       X'40' SENDCNF/SENDCNFD PERMITTED
          ..1. ....      PDEAPRCQ       X'20' MSGBLOK QUEUED ON RECEIVE
                                        QUEUE
          ...1 ....      PDEAPSNQ       X'10' MSGBLOK QUEUED ON SEND
                                        QUEUE
          .... 1...      PDEAPPND       X'08' FUNCTION PENDING ON THIS
                                        PATH
          .... .1..      PDEAPSRQ       X'04' SENDREQ PENDING ON THIS
                                        PATH
          .... ..1.      PDEAPMPD       X'02' MESSAGE PENDING BUT NOT IN
                                        RECEIVE STATE
          .... ...1      PDEPURGE       X'01' IUCV PURGE allowed on this
                                        path
     NOTES : PDESTATE IS AN EXTERNAL VALUE. IF A NEW STATE IS ADDED THERE
     ARE TABLES IN THE MODULES WHICH HANDLE SEND, RECEIVE AND SEVER
     PROCESSING WHICH HAVE CORRESPONDING ENTRIES ADDED.
000E   14 Bitstring    1 PDESTATE       APPC/VM STATE CODES
          .... ...1      PDESRSET       X'01' PATH IN RESET STATE
          .... ..1.      PDESTCON       X'02' PATH IN CONNECT STATE
          .... ..11      PDESTSND       X'03' PATH IN SEND STATE
          .... .1..      PDESTRCV       X'04' PATH IN RECEIVE STATE
          .... .1.1      PDESTCFM       X'05' PATH IN CONFIRM STATE
          .... .11.      PDESTSVR       X'06' PATH IN SEVER STATE
          .... .111      PDESDEFR       X'07' PATH IN DEFER_RECEIVE STATE
          .... 1...      PDESDEFS       X'08' PATH IN DEFER_SEVER STATE
          .... 1..1      PDESPREP       X'09' PATH IN PREPARE_RECEIVED
                                        STATE
          .... 1.1.      PDESSRCM       X'0A' PATH IN STATE ... .
                                        SOLICITED_REQUEST_COMMIT_RECEIVED
          .... 1.11      PDESURCM       X'0B' PATH IN STATE ... .
                                        UNSOLICITED_REQUEST_COMMIT_RECEIV
                                        ED
          .... 11..      PDESCMTD       X'0C' PATH IN COMMITED_RECEIVED
                                        STATE
          .... 11.1      PDESBOUT       X'0D' PATH IN BACKOUT_RECEIVED
                                        STATE
          .... 111.      PDESBKRQ       X'0E' PATH IN BACKOUT_REQUIRED
                                        STATE
000F   15 Bitstring    1 PDEAPPF2       SECOND APPC/VM FLAG BYTE
          1... ....      PDECMSRV       X'80' COMMUNICATION SERVER PATH
          .1.. ....      PDELGDOK       X'40' WILLING TO RECEIVE LOG_DATA
          ..1. ....      PDELGDAT       X'20' LOG_DATA PENDING ON PATH
          ...1 ....      PDELDSVR       X'10' PATH SEVERED WITH LOG_DATA
          .... 1...      PDETGOK        X'08' TARGET PATH IS STILL VALID
          .... .1..      PDESNCPT       X'04' SYNCPT FLOWS ALLOWED ON
                                        PATH
          .... ..1.      PDECHGDR       X'02' CHANGE DIRECTION IS OK
          .... ...1      PDEPDSPF       X'01' SETSTATE INV- SYNCPT FLOW
                                        PENDING
0010   16 Bitstring    1 PDEAPPF3       THIRD APPC/VM FLAG BYTE
          1... ....      PDELRCNV       X'80' ONLY FIRST BYTE OF LOGICAL
                                        RECORD LENGTH AVAILABLE IN
                                        CURRENT BUFFER
          .1.. ....      PDEACIMM       X'40' ALLOCATE STATE AND RECEIVE
                                        STATE
          ..1. ....      PDESTBKR       X'20' BACKOUT_REQUIRED SET VIA
                                        SETSTATE
          ...1 ....      PDEMDRCV       X'10' REQUEST RECEIVE STATE
                                        MODIFIER
          .... 1...      PDEMDSVR       X'08' REQUEST SEVER STATE
                                        MODIFIER
          .... .1..      PDEGOTPR       X'04' PREPARE RECEIVED ON PATH
          .... ..1.      PDESNTPR       X'02' PREPARE SENT ON PATH
          .... ...1      PDESNCIP       X'01' SYNCPOINT IN PROGRESS
0011   17 Bitstring    1 PDEAPPF4       STATE RELATED FIELDS CONTROL
          1... ....      PDENEWLU       X'80' PARTNER SUPPORTS RECEIVING
                                        LUWID
          .1.. ....      PDEPHAS2       X'40' IN 2ND PHASE OF 2-PHASE
                                        SYNCPT
          ..1. ....      PDEAPPCW       X'20' PATH IN APPCVM WAIT
          ...1 ....      PDESUSPC       X'10' PATH IN SUSPENDED CONNECT
          .... 1...      PDEALLAV       X'08' PDESADDR IS VALID CONBK
                                        ADDRESS CONBK IS ALLOCATION DATA
          .... .1..      PDECCED        X'04' PDESADDR IS VALID CCED
                                        ADDRESS
          .... ..1.      PDEALTID       X'02' THIS PATH SET VMDALTID,
                                        SEVERING THIS PATH WILL CLEAR IT
          .... ...1      PDELUWID       X'01' STOP SENDBACK, SENDERR FOR
                                        NOW
0012   18 Signed       2 PDELRECL       LENGTH REMAINING IN LOGICAL
                                        RECORD
0014   20 Signed       4 PDESADDR       STATE RELATED ADDRESS IUSBK OR
                                        CONBK ADDRESS
0018   24 Signed       2 PDEMSGLM       MESSAGE LIMIT
001A   26 Bitstring    1 PDESAVST       PREVIOUS STATE OF PATH
001B   27 Bitstring    1 PDEAPPF5       FIFTH FLAG BYTE
          1... ....      PDECANCL       X'80' Suspended CONNECT has been
                                        can- celled, blocks will be
                                        released
          .... 1...      PDESVSIP       X'08' SEVER ISSUED DURING SYNCPT
          .... .1..      PDEPBRIP       X'04' PARTNER SPECIFIED RIP ON
                                        BACKOUT
          .... ..1.      PDELGPRT       X'02' LOG DATA PARTIALLY RECEIVED
          .... ...1      PDELGSNC       X'01' LOG DATA SENT DURING SYNCPT
001C   28 Address      4 PDEPPA         Address of the PPA block for this
                                        connection.
          00000004       PDESIZE        (*-PDEBK+7)/8 PDEBK SIZE IN
                                        DOUBLEWORDS
     NOTES : IN ORDER FOR THE PDEBK MANAGEMENT CODE TO WORK PROPERLY THE
     FOLLOWING TWO VALUES MUST ALWAYS BE ROUNDED TO THE NEAREST DOUBLE WORD
     VALUE.
          00000008       PDENTMIN       8 MIN NUMBER OF PDEBKS TO BE
                                        BUILT
          00000080       PDENTMAX       128 MAXIMUM PDEBKS IN A PDSEG

 

PDEBK Storage Layout

          
*** PDEBK - PATH DESCRIPTOR ENTRY
*
*     +-------------+-------------+---------------------------+
*   0 |  PDEMSGCT   |  PDETGPID   |         PDETGCCT          |
*     +-------------+-------------+------+------+------+------+
*   8 |         PDETGLKA          |:FLAGS|:APPFL|:STATE|:APPF2|
*     +------+------+-------------+------+------+------+------+
*  10 |:APPF3|:APPF4|  PDELRECL   |         PDESADDR          |
*     +------+------+------+------+---------------------------+
*  18 |  PDEMSGLM   |:SAVST|:APPF5|          PDEPPA           |
*     +-------------+------+------+---------------------------+
*  20
*
*** PDEBK - PATH DESCRIPTOR ENTRY

 

PDEBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
PDEACIMM       0010 40
PDEALLAV       0011 08
PDEALTID       0011 02
PDEAPMPD       000D 02
PDEAPPC        000D 80
PDEAPPCW       0011 20
PDEAPPFL       000D
PDEAPPF2       000F
PDEAPPF3       0010
PDEAPPF4       0011
PDEAPPF5       001B
PDEAPPND       000D 08
PDEAPRCQ       000D 20
PDEAPSCF       000D 40
PDEAPSNQ       000D 10
PDEAPSRQ       000D 04
PDECANCL       001B 80
PDECCED        0011 04
PDECHGDR       000F 02
PDECMSRV       000F 80
PDECNTRL       000C 04
PDEFLAGS       000C
PDEGOTPR       0010 04
PDELDSVR       000F 10
PDELGDAT       000F 20
PDELGDOK       000F 40
PDELGPRT       001B 02
PDELGSNC       001B 01
PDELRCNV       0010 80
PDELRECL       0012
PDELUWID       0011 01
PDEMDRCV       0010 10
PDEMDSVR       0010 08
PDEMSGCT       0000
PDEMSGLM       0018
PDENEWLU       0011 80
PDENTMAX       001C 00000080
PDENTMIN       001C 00000008
PDEPBRIP       001B 04
PDEPDSPF       000F 01
PDEPEND1       000C 02
PDEPEND2       000C 01
PDEPHAS2       0011 40
PDEPHELD       000C 08
PDEPPA         001C
PDEPRMD        000C 10
PDEPRTY        000C 20
PDEPURGE       000D 01
PDESADDR       0014
PDESAVST       001A
PDESBKRQ       000E 0E
PDESBOUT       000E 0D
PDESCMTD       000E 0C
PDESDEFR       000E 07
PDESDEFS       000E 08
PDESEND        000C 40
PDESEVRD       000C 00000003
PDESIZE        001C 00000004
PDESNCIP       0010 01
PDESNCPT       000F 04
PDESNTPR       0010 02
PDESPREP       000E 09
PDESRSET       000E 01
PDESSRCM       000E 0A
PDESTATE       000E
PDESTBKR       0010 20
PDESTCFM       000E 05
PDESTCON       000E 02
PDESTRCV       000E 04
PDESTSND       000E 03
PDESTSVR       000E 06
PDESURCM       000E 0B
PDESUSPC       0011 10
PDESVSIP       001B 08
PDETGCCT       0004
PDETGLKA       0008
PDETGOK        000F 08
PDETGPID       0002
PDEVALID       000C 80
PDEZERO        000C 00

This information is based on z/VM V4R3.0. Last updated on 30 Apr 2002 at 17:13:10 EDT.
Copyright IBM Corporation, 1990, 2002