The TCSWAIT system initialization
parameter specifies the required CICS terminal control shutdown wait
threshold.
- TCSWAIT={4|number|NO|NONE|0}
- The wait threshold is the time, during shutdown, that CICS terminal
control allows to pass before it considers terminal shutdown to be
hung. If all z/OS Communications Server sessions shutdown and close
before the threshold expires then the CICS shutdown process moves
on to its next stage, and the terminal control wait threshold then
no longer applies. If, however, some of the z/OS Communications Server
sessions do not complete shutdown and close, then CICS takes special
action with these sessions. For details of this special action see
the description of the TCSACTN system initialization parameter. The
wait threshold only applies to z/OS Communications Server sessions;
that is, z/OS Communications Server terminals and z/OS Communications
Server intersystem connections. The wait time is specified as a number
of minutes, in the range 1 through 99. As a special case, TCSWAIT=NO
may be specified to indicate that terminal control shutdown is never
to be considered hung, no matter how long the shutdown and close process
takes. TCSWAIT=NONE and TCSWAIT=0 are alternative synonyms for TCSWAIT=NO,
and all three have the same effect (internally they are held as the
one value 0 (zero)).
The value that you specify on the TCSWAIT
system initialization parameter should be large enough so that under
normal circumstances all z/OS Communications Server terminals and
connections shutdown in an orderly fashion. To help choose this value,
consider using a value slightly larger than the elapsed time between
the following two CICS terminal control shutdown messages:
DFHZC2305 Termination of VTAM sessions beginning
DFHZC2316 VTAM ACB is closed
Note: VTAM is now z/OS Communications Server.
Last updated: Thursday, 27 June 2019