For ways to adjust some process operating characteristics, see the command description “View”. For ways to get information about certain process operating characteristics, see the function description “$View()”.
In GT.M, support of environment specification for global names and resource names is possible. It is possible to excercise user code to customize interpretation of the environment specification. See Chapter 5: “General Language Features of M” for details.
The following table summarizes GT.M extensions that increase general capability.
|
GT.M Extensions for Additional Capability | |
|---|---|
|
EXTENSION |
EXPLANATION |
|
View |
Modifies the environment. |
|
ZAllocate* |
Facilitates incremental locking by locking a name without unlocking previously locked names. |
|
ZDeallocate* |
Unlocks one or more names without necessarily unlocking other names. |
|
ZHelp |
Provides access to on-line help. |
|
ZWIthdraw |
"Kills" data in a node without affecting the node's descendants. |
|
$Order() |
Enhanced to return the next unsubscripted variable in collating sequence from the current environment. Name-level $ORDER() always returns an empty string when used with extended references. |
|
$View() |
Examines the GT.M environment. |
|
$ZCStatus |
Returns the status from the last compile. |
|
$ZDate() |
Converts a date and/or time in $HOROLOG format into formatted text, using a user-specified format string. |
|
$ZPrevious()** |
Returns the previous element in a collating sequence, at the current level of a local or global array. |
|
$ZA,$ZB, $ZEOF |
Return device dependent I/O status information. |
|
$ZCOmpile |
Maintains the compiler qualifiers to be used on automatic compilation. |
|
$ZBIT functions |
A series of functions beginning with the characters $ZBIT that allow manipulation of bits. |
|
$ZGBLdir |
Maintains the name of the current global directory; may be set to switch this process to a new database. |
|
$ZIO |
Contains translated name of current I/O device. |
|
$ZINTerrupt |
Specifies the code to be XECUTE'd when an interrupt is processed. |
|
$ZKEY |
SD: Returns current position in the sequential file based on last read. |
|
$ZMAXTPTIme |
Contains an integer value indicating the time duration GT.M should wait for the completion of all activities fenced by the current transaction's outermost TSTART/TCOMMIT pair. |
|
$ZROutines |
Maintains the list of directories to search during look-ups of object and source files. |
|
$ZSYstem |
Returns the status code for the last subprocess invoked with the ZSYSTEM command. |
|
$ZVERsion |
Contains a designation of the current version name, level, and operating system. |
*The ZALLOCATE and ZDEALLOCATE commands are provided for compatibility with other M systems. However, FIS recommends use of the standard LOCK command, which provides an incremental locking facility. The incremental lock provides both flexibility and greater compatibility with the M language standard.
**The $ZPREVIOUS function is provided for compatibility with previous versions of GT.M and other M systems. However, FIS recommends use of the standard two-argument form for the $ORDER function.
