An instantiation of an object
class. A coupling facility (CF) list structure or a connection to a CF
list structure.
object aggregation
The practice of grouping
unrelated objects (in terms of inheritance) together to represent other
objects.
object class
A description that defines the
exact format of the attributes (data) as well as the exact methods (functions)
to be applied to the data. A category of objects.
object code
Machine-executable instructions,
usually generated by a compiler from source code written in a higher level
language (such as C language).
object file
In the TPF system, a compiler or
assembler output file that is suitable as input to a linkage editor.
Object files are included in a load module as designated by the build script
for the load module.
object header
A header that contains an
object ID, update sequence counter, and object length.
object ID
A field containing the hexadecimal
class ID of the object. When you find an object in a record using the
ZDFIL command, you can determine what class or type of object it is from this
class ID. The class IDs of all the objects used by TPF collection
support (TPFCS) are defined by CLASSID macro statements in the ITO2 copy
segment.
object length
A field containing the length
of an object when it is brought into memory by TPF collection support (TPFCS)
to process its associated persistent collection.
object module
In the TPF system, an output
file produced by a C compiler supported by the TPF system or by the high-level
assembler (HLASM) that is ready to be processed by the TPF offline loader,
TPFLDR. To create an object module using a C compiler, use the
TARGET(TPF) option. To create an object module with HLASM, the source
code must call the BEGIN macro with TPFISOC=NO and the FINIS macro.
OCR
Open Systems Adapter (OSA) configuration
record.
octal
A base 8 numbering system.
octal constant
The digit 0 followed by any
digits 0 to 7.
online multiple release
A multiple release
where pool directory update (PDU) processing was run between two or more
releases of a pool address. See also multiple release and
offline multiple release.
offline ACF/SNA table generation (OSTG)
A
function that creates the tables used online to define and control the ACF/SNA
network.
offline functions
See offline
system.
offline loader
See general file
loader, auxiliary loader, or E-type
loader.
offline multiple release
A multiple release
where pool directory update (PDU) processing was not run between two or more
releases of a pool address. See also multiple release and
online multiple release.
offline system
The batch-oriented MVS
programs that support the online TPF system.
offload device
A device that performs
well-defined interface services to free the host processor to perform other
tasks.
OLD
A symbolic name, reserved to TPF, for a
general tape denoting the load medium to be used by the E-type loader
function.
OMT
Output message transmitter.
online loader
See general file
loader, auxiliary loader, or E-type
loader.
online system
The TPF production
system.
on-time event
The signal generated by a
Sysplex Timer (STR) that verifies TOD synchronization in the CPC.
open file
A file that is currently
associated with a file descriptor. (POSIX.1)
open file description
An object that
contains information such as a file offset, the status of a file, and the
access mode of a file. An open file description can be referred to by
one or more file descriptors.
Open Systems Adapter (OSA)
Integrated
hardware that combines the functions of an IBM System/390 input/output
(I/O) channel with the functions of a network port to provide direct
connectivity between IBM System/390 applications and their clients on the
attached networks.
operand
An expression that is acted upon by
an operator.
operating system
Software that controls
functions such as resource allocation, scheduling, input/output control, and
data management.
operation
A specific action such as add,
multiply, shift.
operational program zero (OPZERO)
The
program that creates an entry control block (ECB), defines an entry, and
therefore introduces new message information into the system for
processing. It is activated when the CPU loop dispatches a work item
from the input list.
operator
A symbol (such as +,
-, *) that represents an operation (in this case,
addition, subtraction, multiplication).
OPR dump
The dump generated when an
ECB-controlled program detects an error condition that does not necessarily
stop the ECB from continuing its processing.
optimistic concurrency
In TPF collection
support (TPFCS), a way of controlling data access. Optimistic
concurrency allows a user to read a collection, update it, and replace it
without requiring exclusive access to the collection.
OPZERO
Operational program zero.
ordinal number
For a symbolic file address,
the relative position of a record in a record type.
OSA
Open Systems Adapter.
OSA configuration record (OCR)
A record
consisting of two tables, the Open Systems Adapter (OSA) definition table and
the OSA Internet Protocol (IP) address table, that contain the definitions and
status of OSA-Express connections.
OSA control block
A control block that
contains one entry for each active OSA-Express connection.
OSA definition table
A table in the Open
Systems Adapter (OSA) configuration record that contains the definitions and
status of the OSA-Express connections.
OSA-Express
Integrated hardware that uses
queued direct I/O (QDIO) to communicate with high-bandwidth networks such as
the Gigabit Ethernet (GbE or GENET) or Fast Ethernet (FENET) networks.
OSA IP address table
A table in the Open
Systems Adapter (OSA) configuration record that contains the definitions and
status of the Internet Protocol (IP) addresses associated with OSA-Express
connections.
OSA shared IP address table (OSIT)
A table
that contains the status of all Open Systems Adapter (OSA) Internet Protocol
(IP) addresses in a loosely coupled TPF complex.
OSIT
Open Systems Adapter (OSA) shared
Internet Protocol (IP) address table.
OSTG
Offline ACF/SNA table
generation.
out-of-band
The MSG_OOB flag can be set on
stream sockets for calls such as send, recv, and
recvfrom. The MSG_OOB flag is set for high priority
data. Flagged data, which is 1 byte long, may be sent inline with other
data or as a single byte by itself. If flagged data is sent inline, it
is marked to be read in a specific sequence in relation to the other inline
data.
output command handler
A main storage
resident program that transmits queued SNA commands.
output message transmitter (OMT)
The program
that queues and initiates output message transmission to terminals in an
ACF/SNA network.
overflow
A condition that occurs when a
portion of the result of an operation exceeds the capacity of the intended
unit of storage.