Chapter 3. Operating NetView FTP V2.2.1 MVS - IBM

The ESTAE Recovery Routine of a Queue Handler Service Subtask
This recovery routine is implemented in module DVGMQFUN. It performs the following
steps:
1. The FSB is flagged so that this specific subtask remains nondispatchable for
the rest of the queue handler’s processing. Another flag, which indicates that
the queue handler has entered the state of immediate termination, is set.
2. The NetView FTP V2.2.1 MVS symptom record is set up and dumped via a
SNAP macroinstruction.
3. The following storage areas are dumped via a SNAP macroinstruction:
� FSB and FSBX
� Queue handler global control block (QHCB)
� Request vector table
� Request queue directory
� Server table
� Server group table.
4. A storage dump is produced via a SNAP macroinstruction using the following
parameters:
PDATA All
SDATA LSQA, SWA, CB, TRT, DM, ERR, IO, Q.
5. A message indicating the abnormal termination event is issued.
6. The address space that waits for the completion of the queue handler
command is told that the queue handler command has terminated.
The return and reason code for the queue handler command reflects the
abnormal termination situation.
7. All held locks are released.
8. The buffers for checkpoint data-set processing are released.
9. If no SNAP dump can be issued, a system dump is requested with the
DUMP=YES option of the SETRP macroinstruction. Otherwise, no system
dump is requested.
Note: The main task of the queue handler treats a termination of one of its subtasks
as an error situation. It processes this situation as if the operator had
stopped the queue handler using the operator interface routine.
Abnormal Termination of a Server
The processing in case of abnormal termination of an SNA server depends on
whether the error occurred during the processing in the server’s main task or in one
of its transferring subtasks. However, because the SVC routine is part of the
server, its ESTAE routine may get control.
Because of the restrictions placed on the SVC, its ESTAE does not attempt to
recover the error. It performs basic cleanup functions and then passes control to
the RTM. The server main task controls all processing of the server. It also processes
the scheduling of file-transfer requests. The server subtasks perform the file
transfer. What occurs in the case of an abnormal termination of an OSI server is
described in “Recovery of an OSI Server” on page 160.
Chapter 13. Handling NetView FTP V2.2.1 MVS Abnormal Terminations 157