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ISPF GUI TSO line mode message queue enqueue z/OS ISPF Planning and Customizing GC19-3623-00 |
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Running ISPF GUI with TSO line mode support (that is, displaying
TSO line mode and tputs/tgets in the ISPF/TSO window) requires a messaging
queue for each user (TSO address space). This is used to coordinate
the incoming TSO line mode and TPUT/TGET messages so that they will
be synchronized correctly. Thus, ISPF issues this enqueue before placing
messages on or retrieving messages from this message queue:
where
Note: In addition to issuing this enqueue while running in GUI mode,
this enqueue on SYSZDTSK is issued from the ISPF SVC 93 exit ISPSC93X
when processing a cross-memory message even if the user is not running
in GUI mode. This is because at the point the enqueue must be issued,
the exit is not running in the user's address space and therefore
does not know if the user is running in ISPF GUI mode.
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