PH16448: MQCTL API IS NOT RETURNED TO APPLICATION WHEN SPECIFING BROWSE NEXT WAIT OPTION WITH 5 SEC INTERVAL FOR SHARED QUEUE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer use MQInput node in the message flow of IBM Integration
  Bus for z/OS V10, and it internally issues MQCB/MQCTL for async
  get with browse next wait (wait interval is 5 sec) option.
  When customer tried to stop the message flow, the stop process
  hang and is timed out, then BIP4041E is seen in the log.
  This cause IIB Integration Server to hang in termination unless
  MQ QMGR is cancelled.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 8       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Callbacks registered by MQCB against    *
  *                      shared queues are not called for        *
  *                      MQRC_NO_MSG_AVAILABLE (MQRC2033) when   *
  *                      browsing for messages and the wait      *
  *                      interval expires.                       *
  ****************************************************************
  When browsing a shared queue, an internal MQGET is redriven
  periodically to check for new messages arriving on the queue.
  If the WaitInterval is found to have expired CSQMGETM redrives
  the internal MQGET again, resetting the WaitInterval, without
  returning control to the adapter for the callback to be driven.
  
  If the callback was started with MQCTL_START_WAIT, this means
  that the calling thread does not receive control back until the
  exit is driven for another reason (for example, a message
  arriving on the queue) and stops the callback.
  

Problem conclusion

• CSQMGET has been changed to correctly indicate to CSQMGETM
  that the WaitInterval has expired so that the callback will be
  driven for reason MQRC_NO_MSG_AVAILABLE.
  

Temporary fix

Comments

APAR Information

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

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

  PH18752 UI66377

Modules/Macros

• CSQMGET
  

Fix information

• Fixed component name

  IBM MQ Z/OS V8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI66377

     UP19/11/27 P F911

Fix is available

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