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SUBJECT:         APAR  NUMBER: PJ27595
 
REFERENCE:  AREA:     3270 LOCAL
            SEGMENT:  CFMDC40    - RELEASE:  TPF4  (Macro)
            SEGMENT:  CVLD40     - RELEASE:  TPF4  (Assembler)
            SEGMENT:  CVLG40     - RELEASE:  TPF4  (Assembler)
            SEGMENT:  CZ1SE40    - RELEASE:  TPF4  (Macro)
            SEGMENT:  DCR240     - RELEASE:  TPF4  (Assembler)
 
 
Pre-requisite APARs are:
FOR SEGMENT CFMDC40    (Macro)     - REL TPF4
 PJ13503  PJ13634  PJ13674  PJ14355  
 PJ15208  PJ14437  PJ14790  
 PJ17852  PJ19422  PJ21167  PJ20551  
 PJ21313  PJ21791  PJ21715  
 PJ17689  PJ22389  PJ23003  PJ23116  
 PJ22434  PJ23178  PJ23931  
 PJ23923  PJ24472  PJ24530  PJ24845  
 PJ24861  PJ25084  PJ25094  
 PJ25078  PJ24945  PJ25459  PJ25781  
 PJ25981  PJ25841  PJ25932  
 PJ26089  PJ26575  PJ26707  PJ27079  
 PJ27275  PJ27268  PJ27333  
 PJ27393  PJ27422  
FOR SEGMENT CVLD40     (Assembler) - REL TPF4
 PJ21313  PJ22741  
FOR SEGMENT CZ1SE40    (Macro)     - REL TPF4
 PJ13634  PJ13674  PJ14078  PJ13754  
 PJ14605  PJ14437  PJ14790  
 PJ15959  PJ17852  PJ19949  PJ21044  
 PJ21167  PJ21313  PJ21791  
 PJ21715  PJ17689  PJ22389  PJ23003  
 PJ23103  PJ22434  PJ23178  
 PJ23336  PJ23923  PJ24084  PJ24530  
 PJ25084  PJ25094  PJ25323  
 PJ25589  PJ25760  PJ25781  PJ25780  
 PJ25855  PJ25981  PJ26188  
 PJ26575  PJ26683  PJ26713  PJ26600  
 PJ26686  PJ26707  PJ26427  
 PJ26774  PJ26580  PJ26967  PJ27023  
 PJ26890  PJ27079  PJ26891  
 PJ27387  PJ27083  PJ27268  PJ27333  PJ27393  PJ27422  PJ27469  
FOR SEGMENT DCR240     (Assembler) - REL TPF4
 PJ13674  PJ14078  PJ14605  PJ14437  
 PJ17852  PJ21715  PJ17689  
 PJ23178  PJ23923  PJ27387  
To be applied in the order listed for each segment.

ABSTRACT OF PROBLEM
___________________
Entering  the ZLSTP functional message against a 3270 local line
that has a hardware problem can result in an endless loop, which
prevents the ZLSTP functional message from being completed.
 

COMMENTS ON PROBLEM
___________________
If an operator enters ZLSTP LC xx (where xx is either  the  line
number  of a 3270 local line or the text string "ALL") to stop a
3270 local line, real-time segment  CVLG,  which  processes  the
ZLSTP functional message, can get into an endless loop. This can
occur  while  CVLG  is  waiting for any messages built up on the
core queue for the 3270 local line to be written out to the 3270
local device.  If there are any hardware problems  on  the  3270
local  device  or  on  the  3270 local control unit to which the
device is attached, the messages will never stop writing out  to
the device that the operator is attempting to stop. Because CVLG
issues  DLAYC  macros  and  continues  to  check the size of the
message queue of the 3270 local device, the program can get into
an endless loop while waiting for the queue size to reach  zero.
As a result, the operator will never get a completion message in
response to their ZLSTP functional message command.
 
 

SOLUTION
________
A new timing mechanism has been added to real-time segment CVLG.
If  the  size of the 3270 local message queue is not worked down
to zero (implying there are no more messages on  queue  for  the
device)  while  trying to stop the line via the ZLSTP functional
message, the line is then timed out, a  newly  defined  dump  is
taken,  and  CVLG  either  continues to stop the next 3270 local
line or exits if this is the last or only line to  process.  The
newly  defined dump, which occurs as a result of the timeout, is
a CTL-3CC dump with error message "CVLG - TIMED OUT ON  STOPPING
LINE."
 
DEPENDENCIES
____________
 
Related Segments Affected By This APAR.
_______________________________________
 
Segments to be assembled or compiled:
- STPP
- ICDF.
 
Segments to be link-edited:
- PPCP
- DCRS.
 
Load Modules to be loaded:
- None.
 
Migration Considerations
========================
- None.
 
-- END APAR PJ27595
 
 
 



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