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v The DFHCESD program started by the CICS-supplied transaction, CESD,
attempts to purge and back out long-running tasks using increasingly stronger
methods (see “The shutdown assist transaction” on page 30).
v Tasks that are automatically initiated are run—if they start before the second
quiesce stage.
v Any programs listed in the first part of the shutdown program list table (PLT)
are run sequentially. (The shutdown PLT suffix is specified in the PLTSD system
initialization parameter, which can be overridden by the PLT option of the
CEMT or EXEC CICS PERFORM SHUTDOWN command.)
v A new task started as a result of terminal input is allowed to start only if its
transaction code is listed in the current transaction list table (XLT) or has been
defined as SHUTDOWN(ENABLED) in the transaction resource definition. The
XLT list of transactions restricts the tasks that can be started by terminals and
allows the system to shut down in a controlled manner. The current XLT is the
one specified by the XLT=xx system initialization parameter, which can be
overridden by the XLT option of the CEMT or EXEC CICS PERFORM
SHUTDOWN command.
Certain CICS-supplied transactions are, however, allowed to start whether their
code is listed in the XLT or not. These transactions are CEMT, CESF, CLR1,
CLR2, CLQ2, CLS1, CLS2, CSAC, CSTE, and CSNE.
v Finally, at the end of this stage and before the second stage of shutdown, CICS
unbinds all the VTAM terminals and devices.
The first quiesce stage is complete when the last of the programs listed in the first
part of the shutdown PLT has executed and all user tasks are complete. If the
CICS-supplied shutdown transaction CESD is used, this stage does not wait
indefinitely for all user tasks to complete.
Second quiesce stage
During the second quiesce stage of shutdown:
v Terminals are not active.
v No new tasks are allowed to start.
v Programs listed in the second part of the shutdown PLT (if any) run
sequentially. These programs cannot communicate with terminals, or make any
request that would cause a new task to start.
The second quiesce stage ends when the last of the programs listed in the PLT has
completed executing.
Third quiesce stage
During the third quiesce stage of shutdown:
v CICS closes all files that are defined to CICS file control. However, CICS does
not catalog the files as UNENABLED; they can then be opened implicitly by the
first reference after a subsequent CICS restart.
Files that are eligible for BWO support have the BWO attributes in the ICF
catalog set to indicate that BWO is not supported. This prevents BWO backups
being taken in the subsequent batch window.
v All extrapartition TD queues are closed.
v CICS writes statistics to the system management facility (SMF) data set.
v CICS recovery manager sets the type-of-restart indicator in its domain state
record in the global catalog to “warm-start-possible”. If you specify
START=AUTO when you next initialize the CICS region, CICS uses the status of
26 CICS TS for z/OS 4.1: Recovery and Restart Guide