A C identifier for a global field
or record, that corresponds to the assembler label of the same name. It
is defined as a unique 32-bit unsigned integer. The bit settings that
make up the integer reflect attributes of the global field or record.
tape device assignment
The association of a
tape device with a tape group name and subsystem user.
tape device assignment table (TDAT)
A table
used to associate tape devices with tape group names.
tape group
A set of associations between
tape labels (tape names) and tape devices. Each tape
group is identified by a tape group name.
tape group definition table (TGDT)
A
processor-unique table used during automatic tape mounting that contains a
list of tape group names.
tape group name
A processor-unique tape
group identifier. The names ALL and NONE are reserved group names that
cannot be deleted.
tape label assignment
The association of a
tape label (tape name) with a tape group.
tape module number
The ordinal number of the
tape status table (TSTB) entry the specified device or tape is using.
tape reconfiguration
The process of
adjusting available tape drives to fluctuating system, application, and
hardware maintenance requirements.
tape status table (TSTB)
A system table
containing the data required to control tape operations. Each TSTB item
provides durable (for example, device address) and transient (for example,
sense data) information for a particular tape.
tape switch
The process of activating the
next physical tape volume for a given symbolic tape name when processing of
the current tape volume has completed. The next volume to be activated
may be a standby tape or an alternate tape (ALT).
tape symbolic name
A 3-character name
assigned to each tape and used with the tape status table to control tape
resources and operations. Certain names are reserved by the TPF
system; all other combinations are available to users.
task control area (TCA)
The control block
used to communicate between the TPF system and the C compiler generated code
and run-time library.
TC
Tightly coupled.
TCA
Task control area.
TCID
Transport connection identifier.
TCP
Transmission Control Protocol.
TCP/IP
Transmission Control
Protocol/Internet Protocol.
TDAT
Tape device assignment table.
Telnet
In the Internet suite of protocols, a
protocol that provides remote terminal connection service. It allows
users of one host to log on to a remote host and interact as directly attached
terminal users of that host. Telnet uses the Transmission Control
Protocol (TCP) as the underlying protocol.
temporary collections
Collections that
reside in the private heap area of the ECB and overflow to short-term
pools. These collections are deleted when the ECB exits because the
private heap area of the ECB is reclaimed by the system at ECB exit.
terminal address table (WGTA)
See WGTA
table.
terminal control block
Collectively refers
to the scratch pad area (SPA), routing control block (RCB), and agent assembly
area (AAA).
terminal identification table
Collectively
refers to the terminal address table (WGTA) and the resource vector table
(RVT).
terminal interchange
A term associated with
telecommunication components that predate SNA support. A terminal
interchange is functionally the same as a cluster controller.
test unit tape (TUT)
A tape generated with
STC for input to PTV, containing one or more test units and their required
environments. TUT is a reserved tape symbolic name.
TFTP
Trivial File Transfer Protocol.
TGDT
Tape group definition table.
THDR
Transport header.
THGL
Thread global data control
block.
thread control block (TTCB)
The control
block used to define thread types.
thread global data control block (THGL)
The
control block used to contain thread information in a given process.
thread stack definition table (TSDT)
The
control block used by the thread address space manipulation routines to locate
each thread stack.
thread stack usage table (TSUT)
The control
block used to maintain the current status for each thread stack in a given
process.
throw exception
Any user, logic, or system
error detected by a function that does not itself deal with the error but
passes the error on to a handling routine.
TI
Terminal interchange.
tightly coupled
A multiprocessing
environment in which multiple I-stream engines in a single processor complex
run concurrently.
tightly coupled (TC) complex
The
synchronization of shared main storage in an ESA configuration of multiple
I-stream engines. An ESA configuration with only one I-stream engine is
called a uniprocessor and one with multiple I-stream engines a
multiprocessor. Uniprocessor and multiprocessor are terms in the TPF
system that are to be associated with tightly coupled multiprocessing.
tightly coupled (TC) multiprocessing
Refers
to the synchronization of access to shared main storage in a central
processing complex (CPC) of 2 or more I-stream engines.
time available supervisor (TAS)
A procedure
for accepting low-priority work items.
time-of-day clock synchronization
The
process used to synchronize TOD clocks.
TLD
A symbolic name, reserved to TPF, for a
general tape denoting the load medium to be used by the auxiliary loader
function.
TOD
Time-of-day.
TOD clock control override facility
The
facility that permits the control program to set the TOD clock without
requiring operator intervention.
TOD clock synchronization
Time-of-day clock
synchronization.
TOD synch check
An interrupt generated when
a TOD clock goes out of synchronization with the external synchronization
source.
TOD synchronization compatibility (TSC) hardware
A
hardware RPQ required when there are TOD RPQ CPCs and Sysplex Timer (STR) CPCs
in the same loosely coupled complex.
token
A 32-bit value used for efficient
interfacing of processors in MPIF complexes.
token-ring network
A network that supports
unidirectional transmission of data by passing a token from data station to
data station until the data returns to the original station.
An
implementation of the SNA LU 6.2 protocol that allows interconnected
systems to communicate and share the processing of programs.
TPF API functions
C library functions that
provide TPF-specific services.
TPF/APPC
TPF Advanced Program-to-Program
Communications.
TPF block
One of the storage blocks that can
be attached to the CBRW of an ECB. TPF has 128-, 381-, 1055-, and
4095-byte blocks.
TPF C implementation data (CID)
A control
block that contains the address of the ISO-C static exception routine.
It is initialized by the CINFC macro.
TPF CLAW device interface
Provides CLAW I/O
functions, manages I/O queues, and handles I/O completions using the Common
Link Access to Workstation (CLAW) protocol.
TPF CLAW services
Provides the control
program service routines for the CLAW API functions and enters the TPF CLAW
device interface to complete the processing of the CLAW functions.
A database that provides a
set of services for any application that would like to store persistent
collections. The TPFCS database handles collection sizes from 1 element
to more than 2 000 000 000 elements.
TPFCS primary record
The first logical copy
of each record used to represent a collection. If a collection is not
shadowed, TPF collection support (TPFCS) then uses only primary records to
represent the collection.
TPFCS shadow record
A duplicate copy of each
of the records used to represent the TPF collection support (TPFCS) collection
in the TPF database. TPFCS provides shadowing independent of TPF
duplication of files.
A C data structure used as a
register save area and parameter passing area when calling an assembler
program. TPF_regs contains the values of general registers
R0-R7.
TPNS
Teleprocessing network
simulator.
TPNT
Transaction program name table.
TPSA
A field in the TCA that is used by the
TPF ISO-C startup code to store the address of an area for saving
registers. The stack overflow routine uses this field to access the
area for saving registers.
transaction
A series of messages related to
a processing requirement.
transaction manager (TM)
In TPF transaction
services, a manager that provides a set of application program interfaces
(APIs) for an application to define the scope of a transaction and actions to
be taken for the transaction. The TM coordinates resource managers and
determines which resources are written to the recovery log at commit time and
which resources are recovered at restart time.
An
IBM licensed program that is a database manager for application programs that
run in a Transaction Processing Facility (TPF) environment, or under Airline
Control System MVS/XA (ALCS/MVS/XA), or Airline Control System Version 2 (ALCS
V2).
transaction program (TP)
An application
program that uses APPC communication services to communicate with a partner
transaction program. A TPF local transaction program uses the TPF/APPC
services, and a remote transaction program may use some other implementation
of the APPC architecture.
transaction program name table (TPNT)
A
table used to define the local TPF transaction program names as known by the
remote transaction programs.
transaction unit
In the program test vehicle
(PTV), a gradient of program testing that allows a complete transaction to be
tested in a single thread environment. If all application programs are
available, the driver is not required. It can be used to monitor the
test. Also see package unit and full
scale.
Transmission Control Protocol (TCP)
A
communications protocol used in the Internet and in any network that follows
the U.S. Department of Defense standards for inter-network
protocol. TCP provides a reliable host-to-host protocol
between hosts in packet-switched communications networks and in interconnected
systems of such networks. It assumes that the Internet protocol is the
underlying protocol. See also User Datagram Protocol
(UDP).
Transmission Control Protocol/Internet Protocol (TCP/IP)
A
set of communications protocols that support peer-to-peer connectivity
functions for both local and wide area networks.
transmission queue
A local queue on which
prepared messages destined for a remote queue manager are temporarily
stored.
transport connection identifier (TCID)
An
8-byte hexadecimal value that is used to uniquely identify a rapid transport
protocol (RTP) connection.
transport header (THDR)
The part of the
network layer packet (NLP) that contains control information about the rapid
transport protocol (RTP) connection.
transport layer
The layer in the Internet
architecture that provides the end-to-end data transfer. TCP/IP support
provides support for both TCP and UDP protocols as application interfaces to
Internet Protocol (IP).
triggering
In MQSeries, a facility that
allows a queue manager to start an application automatically when
predetermined conditions on a queue are satisfied.
trigger message
A message containing
information about the program that a trigger monitor is to start.
trigger monitor
A continuously running
application serving one or more initiation queues. When a trigger
message arrives on an initiation queue, the trigger monitor retrieves the
message and uses the information in the trigger message to start a process
that serves the queue on which a trigger event occurred.
Trivial File Transfer Protocol (TFTP)
A
protocol for file transfer that requires minimal overhead and provides minimal
capability. TFTP uses the connectionless datagram delivery services of
the User Datagram Protocol (UDP).
truncate
To shorten a value to a specified
length.
try block
A block in which a known C++
exception is passed to a handler.