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modegroup specified on this allocate request and send an
information message to the operator console. Retry the modegroup
after an interval.
UERCPURG
Task purged during XPI call.
In the case of a successful allocate following the use of UERCAKLL or
UERCAKLM, on a previous invocation of the exit, use one of the following:
UERCNORM
Resume normal operation of the link or modegroup.
UERCPUR
Reject the allocate request with SYSIDERR.
XPI calls
All can be used.
Designing an XZIQUE global user exit program
The functions of your XZIQUE exit should be designed:
1. To control of the number of tasks (and the amount of associated resource) that
are waiting in a queue for a free intersystem session. Waiting tasks can degrade
the performance of the local system.
2. To detect poor response from the receiving (remote) system and to notify the
operator (or automatic operations program).
3. To cause CICS to issue a message when the link resumes normal operation.
The XZIQUE global user exit parameter list is designed to support these objectives.
Design considerations
The information passed at XZIQUE is designed to enable your XZIQUE global user
exit program to:
v Avoid false diagnosis of problems on the connection by distinguishing poor
response times from a complete bottleneck
v Ensure that a link resumes normal operation quickly and without operator
intervention once any problem in a remote system is resolved.
Some guidance on the use of IRC/ISC statistics
CICS adds an entry for unsatisfied allocate requests to the following queues:
Non-specific (generic) allocate queue
All non-specific allocate requests are queued in this single queue. CICS makes
the total number of entries in this queue available in the system entry statistics
field A14ESTAQ, to which your global user exit program has access by means
of the address of the system entry statistics, which is passed in UEPCONST.
Specific modegroup allocate queues
Specific allocate requests are queued in the appropriate modegroup
queue—one queue for each specific modegroup name. CICS makes the total
number of entries in all these queues available, as a single total, in the mode
entry statistics field A20ESTAQ, to which your global user exit program has
access by means of the address of the mode entry statistics, which is passed in
UEPMODST.
VTAM working-set module exits
Chapter 1. Global user exit programs 243