IBM: AMTW

z/VM >

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.

AMTW

Prolog

Control Block Contents

AMTW DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

AMTW Prolog
 NAME       : HCPAMTW
 DESCRIPTION: Asynchronous Message Task Work Request
 DSECT      : AMTW
 FUNCTION   : Work element request for asynchronous message read task.
 LOCATED BY : Pointer (RDEVAMTQ) in the Real Device Block
 CREATED BY : Any asynchronous message requester
              HCPAMTRQ - Asynchronous Message Task Interface
 DELETED BY : HCPAMR - Message Read Task

AMTW Control Block Content


AMTW DSECT
Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      AMTW           Asynchronous Message Task Work
                                        Request
0000    0 Address      4 *              Reserved for Gated Queue Manager
                                        for use as a queue chain pointer
0004    4 Bitstring    1 AMTWREQ        Defines the work to be performed
          00000080       AMTWREAD       X'80' Read request
          00000040       AMTWNTFY       X'40' Notify request
          00000020       AMTWRQSC       X'20' Requeue request if a state
                                        change pending condition occurs
          00000010       AMTWCANC       X'10' Cancel request
0005    5 Bitstring    1 AMTWDRMD       Defines the disposition of
                                        message
          00000080       AMTWPEND       X'80' Call reflection if pending
                                        response
          00000040       AMTWRNOM       X'40' Call reflection if
                                        no-message message
          00000020       AMTWRTNM       X'20' Return a no-msg msg with
                                        the furnished msgid
          00000010       AMTWIGNE       X'10' Ignore error - will discard
                                        IOCM
0006    6 Bitstring    1 AMTWAMSK       Attention presented path mask
0007    7 Bitstring    1 *              Reserved
0008    8 Signed       4 AMTWMGID       Message ID for a Read-specific
                                        request
000C   12 Address      4 AMTWRDEV       RDEV Address
0010   16 Address      4 AMTWVDEV       VDEV Address
0014   20 Address      4 AMTWPOST       Pointer to CPEBK which represents
                                        a task waiting to be notified
                                        that the processing for this work
                                        request has been completed
          00000003       AMTWSIZE       ((*-AMTW)+7)/8 AMTW size in
                                        double-words

AMTW Storage Layout

*** AMTW - Asynchronous Message Task Work Request
*
*     +---------------------------+------+------+------+------+
*   0 |///////////////////////////|:WREQ |:WDRMD|:WAMSK|//////|
*     +---------------------------+------+------+------+------+
*   8 |         AMTWMGID          |         AMTWRDEV          |
*     +---------------------------+---------------------------+
*  10 |         AMTWVDEV          |         AMTWPOST          |
*     +---------------------------+---------------------------+
*  18
*
*** AMTW - Asynchronous Message Task Work Request