PM55181: CICS TG does not shut down normally.

CICS Transaction Gateway for Multiplatforms V8.0 Fix Pack 6
CICS Transaction Gateway Desktop Edition V8.0 Fix Pack 6

APAR status

• Closed as program error.

Error description

• The Gateway daemon did not shut down normally because two
  threads became deadlocked during the shutdown process,
  preventing the shutdown completion.
  
  If a shut down coincides with a scheduled statistics collection,
  the localadmin thread and the statistics collection thread can
  hold locks that the other thread requires.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of CICS Transaction Gateway for    *
  *                 Multiplatforms.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS TG does not shut down normally.    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If a statistics collection coincides with the collection of CICS
  TG shutdown statistics, the StatController thread and the
  localadmin thread both attempt to acquire a lock on the
  CTGResourceMgr object and the StatCollector object. This can
  cause a deadlock with each thread holding a resource the other
  thread requires, preventing the Gateway daemon shutting down
  normally.
  

Problem conclusion

• CICS TG has been changed to prevent the deadlock, allowing the
  normal shut down to complete.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PM46890

• APAR is sysrouted TO one or more of the following:

Modules/Macros

• CTGV8DUM
  

Fix information

• Fixed component name

  CICS TRNS GATE

• Fixed component ID

  5724I8102

Applicable component levels

• R800 PSY

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