The task-related user exit program is provided with a parameter list (DFHUEPAR)
by the CICS management module that handles task-related user exits. This
parameter list gives the task-related user exit access to information such as the
addresses and sizes of its own work areas.
The task-related user exit program can be invoked by any of the following:
vAn application program
vCICS SPI manager
vCICS syncpoint manager
vCICS task manager
vCICS termination manager
vCICS context management
vThe Execution Diagnostic Facility (EDF)
The parameter list serves to distinguish between these various callers, and gives
access to a register save area containing the caller’s registers.
The administration routines contain the EXEC CICS ENABLE and DISABLE
commands that you use to install and withdraw the task-related user exit program.
Application
program
Stub
Task-relateduser
exitprogram
Resource
manager
Non-CICS
resource
DFHRMCAL
CICSSPI
manager
CICS
syncpoint
manager
CICStask
manager
CICS
termination
manager
CICS
context
management
EDF
THEADAPTER
Figure4. The adapter concept
268 Customization Guide