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First phase PLT programs
Programs that are to execute during the first quiesce stage of CICS shutdown are
specified in the first half of the PLT (before the DFHDELIM statement).
You must define first stage PLTSD programs to CICS. You can either define the
programs statically, or use program autoinstall.
Although terminals are still available during the first quiesce stage, tasks that are
started by terminal input are rejected unless they are named in a shutdown
transaction list table (XLT), or are CICS-supplied transactions, such as CEMT,
CSAC, CSTE, and CSNE, that are defined as SHUTDOWN(ENABLED) in the
supplied definitions.
The first quiesce stage is complete when all of the first-stage PLT programs have
executed, and when there are no user tasks in the system.
PLT programs for the second quiesce stage
Programs that are to execute during the second quiesce stage of CICS shutdown
are specified in the second half of the PLT (after the DFHDELIM statement).
You do not have to define second stage PLTSD programs to CICS. If you do not,
default definitions are installed automatically by CICS, as described for first phase
PLTPI programs. If any of the default attributes are unsuitable, you must define the
programs statically.
During the second quiesce stage, no new tasks can start, and no terminals are
available. Because of this, second phase PLT programs must not cause other tasks
to be started, and they cannot communicate with terminals. Further, second phase
PLT programs must not cause any resource security checking to be performed.
If a transaction abend occurs while the PLTSD program is running, CICS is left in a
permanent wait state. To avoid this happening, ensure that your PLTSD program
handles all abend conditions.
The second quiesce stage is complete when all of the second phase PLT programs
have been executed.
The shutdown assist utility program, DFHCESD
CICS provides a
shutdown assist transaction
, that can be run during the first
quiesce stage of shutdown. It can be run on a normal or an immediate shutdown.
You specify the name of the shutdown transaction on the SDTRAN system
initialization parameter, or on the SDTRAN option of the PERFORM SHUTDOWN
and PERFORM SHUTDOWN IMMEDIATE commands. You can also specify that no
shutdown assist transaction is to be run. If you do specify that no shutdown assist
transaction is to be run:
v On a normal shutdown, CICS waits for all running tasks to finish before entering
the second stage of quiesce. Long running or conversational transactions can
cause an unacceptable delay or require operator intervention.
shutdown programs
Chapter 4. Writing initialization and shutdown programs 395