OSI/FTAM Programming Reference Manual

Glossary
HP NonStop OSI/FTAM Programming Reference Manual—528611-001
Glossary-8
event.
event. (1) In NonStop OSI terms, an indication or confirm primitive that an application using
the FTAM or OSI/AS API retrieves by calling the APS_EVENT_RECEIVE_ procedure.
See also indication primitive. or confirm primitive. (2) In DSM terms, a significant
change in some condition in the system or network. Events can be operational errors,
notifications of limits exceeded, requests for action needed, and so on. See also EMS
(Event Management Service). and event message.
Event Management Service. See EMS (Event Management Service).
event message. On NonStop systems, a message triggered when a subsystem or system
component using the Event Management Service (EMS) detects the occurrence of a
condition that might affect its operation. Event messages are collected centrally and
distributed to files, processes, and terminals that are programmed to receive them.
They are displayed in text form as operator messages.
execution priority. A numeric-valued attribute of a NonStop process that determines
whether the NonStop operating system will preempt execution of the process in favor
of other processes running in the same CPU. The operating system always executes
the highest-priority process that is ready to run. In SCF, the execution priority of an
FTAM initiator or responder process is determined using the PRIORITY attribute of the
PROCESS object.
Expand network. A network of up to 255 NonStop systems, interconnected using the
Expand network operating software. NonStop systems on an Expand network are
referred to as nodes. extend (write action). To append the data being written to the end
of a file.
external process name. See Guardian process name.
FA (flat all data units). An access context for which data is transferred as a sequence of
node-descriptor data elements and file-contents data elements. The transfer begins
with the node-descriptor data elements, which mark the beginning of data for each
node in the structure. This methodology preserves the structural semantics of the file.
In NonStop FTAM, the only document type that uses FA is FTAM-2. See access-
context parameter.; contrast with UA (unstructured all data units).
FADU (file-access data unit). A unit of the file-access structure on which the transfer,
delete, extend, replace, and insert actions can be performed. A FADU contains zero or
more data units.
FADU-locking functional unit. A functional unit that allows concurrency control locks to be
invoked on FADUs.
fault tolerance. The ability of a computer system to continue performing its designated
functions when any part of the system fails.
file-access data unit. See FADU (file-access data unit).