Caché ObjectScript Reference - InterSystems Documentation

Structured System VariablesDescriptionYou can use the ^$LOCK structured system variable as an argument to the $DATA,$ORDER, and $QUERY functions to return information about locks in the current namespaceor a specified namespace on the local system.ParametersnspaceThis optional parameter allows you to specify a global in another namespace by using extendedglobal reference. You can specify the namespace name either explicitly, or by specifying animplied namespace. The namespace name must be specified as a quoted string. Namespacenames are case-insensitive. You can use either bracket syntax [“USER”] or environmentsyntax |“USER”|. No spaces are allowed before or after the nspace delimiters. You can usethe $ZNSPACE special variable to determine the current namespace, the $ZUTIL(90,10)function to determine if a namespace is defined, and the ZNSPACE command to change thecurrent namespace. For further information on extended global references, see Global Structurein Using Caché Multi-Dimensional Storage.lock_nameAn expression that evaluates to a string containing a lock variable name, either subscriptedor unsubscripted, for use with the LOCK command.ExamplesThe following examples show how to use ^$LOCK as an argument to the $DATA, $ORDER,and $QUERY functions.As an Argument to $DATA$DATA(^$|nspace|LOCK(lock_name))^$LOCK as an argument to $DATA returns an integer value that specifies whether the lockname exists as a node in ^$LOCK. The integer values that $DATA can return are shown inthe following table.Value010MeaningLock name information does not existLock name information exists508 Caché ObjectScript Reference