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-'\"
-'\" Generated from file '' by tcllib/doctools with format 'nroff'
-'\"
-.TH "tsv" n 2\&.8  "Tcl Threading"
-.\" The -*- nroff -*- definitions below are for supplemental macros used
-.\" in Tcl/Tk manual entries.
-.\"
-.\" .AP type name in/out ?indent?
-.\"	Start paragraph describing an argument to a library procedure.
-.\"	type is type of argument (int, etc.), in/out is either "in", "out",
-.\"	or "in/out" to describe whether procedure reads or modifies arg,
-.\"	and indent is equivalent to second arg of .IP (shouldn't ever be
-.\"	needed;  use .AS below instead)
-.\"
-.\" .AS ?type? ?name?
-.\"	Give maximum sizes of arguments for setting tab stops.  Type and
-.\"	name are examples of largest possible arguments that will be passed
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-.\" .BS
-.\"	Start box enclosure.  From here until next .BE, everything will be
-.\"	enclosed in one large box.
-.\"
-.\" .BE
-.\"	End of box enclosure.
-.\"
-.\" .CS
-.\"	Begin code excerpt.
-.\"
-.\" .CE
-.\"	End code excerpt.
-.\"
-.\" .VS ?version? ?br?
-.\"	Begin vertical sidebar, for use in marking newly-changed parts
-.\"	of man pages.  The first argument is ignored and used for recording
-.\"	the version when the .VS was added, so that the sidebars can be
-.\"	found and removed when they reach a certain age.  If another argument
-.\"	is present, then a line break is forced before starting the sidebar.
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-.\"	End of vertical sidebar.
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-.\" .DS
-.\"	Begin an indented unfilled display.
-.\"
-.\" .DE
-.\"	End of indented unfilled display.
-.\"
-.\" .SO ?manpage?
-.\"	Start of list of standard options for a Tk widget. The manpage
-.\"	argument defines where to look up the standard options; if
-.\"	omitted, defaults to "options". The options follow on successive
-.\"	lines, in three columns separated by tabs.
-.\"
-.\" .SE
-.\"	End of list of standard options for a Tk widget.
-.\"
-.\" .OP cmdName dbName dbClass
-.\"	Start of description of a specific option.  cmdName gives the
-.\"	option's name as specified in the class command, dbName gives
-.\"	the option's name in the option database, and dbClass gives
-.\"	the option's class in the option database.
-.\"
-.\" .UL arg1 arg2
-.\"	Print arg1 underlined, then print arg2 normally.
-.\"
-.\" .QW arg1 ?arg2?
-.\"	Print arg1 in quotes, then arg2 normally (for trailing punctuation).
-.\"
-.\" .PQ arg1 ?arg2?
-.\"	Print an open parenthesis, arg1 in quotes, then arg2 normally
-.\"	(for trailing punctuation) and then a closing parenthesis.
-.\"
-.\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
-.if t .wh -1.3i ^B
-.nr ^l \n(.l
-.ad b
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-..
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-.\"	Draw four-sided box normally, but don't draw top of
-.\"	box if the box started on an earlier page.
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-.\"	Draw three-sided box if this is the box's first page,
-.\"	draw two sides but no top otherwise.
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-..
-.\"	# SO - start of list of standard options
-.de SO
-'ie '\\$1'' .ds So \\fBoptions\\fR
-'el .ds So \\fB\\$1\\fR
-.SH "STANDARD OPTIONS"
-.LP
-.nf
-.ta 5.5c 11c
-.ft B
-..
-.\"	# SE - end of list of standard options
-.de SE
-.fi
-.ft R
-.LP
-See the \\*(So manual entry for details on the standard options.
-..
-.\"	# OP - start of full description for a single option
-.de OP
-.LP
-.nf
-.ta 4c
-Command-Line Name:	\\fB\\$1\\fR
-Database Name:	\\fB\\$2\\fR
-Database Class:	\\fB\\$3\\fR
-.fi
-.IP
-..
-.\"	# CS - begin code excerpt
-.de CS
-.RS
-.nf
-.ta .25i .5i .75i 1i
-..
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-.de CE
-.fi
-.RE
-..
-.\"	# UL - underline word
-.de UL
-\\$1\l'|0\(ul'\\$2
-..
-.\"	# QW - apply quotation marks to word
-.de QW
-.ie '\\*(lq'"' ``\\$1''\\$2
-.\"" fix emacs highlighting
-.el \\*(lq\\$1\\*(rq\\$2
-..
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-.de PQ
-.ie '\\*(lq'"' (``\\$1''\\$2)\\$3
-.\"" fix emacs highlighting
-.el (\\*(lq\\$1\\*(rq\\$2)\\$3
-..
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-.de QR
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-.\"" fix emacs highlighting
-.el \\*(lq\\$1\\*(rq\\-\\*(lq\\$2\\*(rq\\$3
-..
-.\"	# MT - "empty" string
-.de MT
-.QW ""
-..
-.BS
-.SH NAME
-tsv \- Part of the Tcl threading extension allowing script level manipulation of data shared between threads\&.
-.SH SYNOPSIS
-package require \fBTcl  8\&.4\fR
-.sp
-package require \fBThread  ?2\&.8?\fR
-.sp
-\fBtsv::names\fR ?pattern?
-.sp
-\fBtsv::object\fR \fIvarname\fR \fIelement\fR
-.sp
-\fBtsv::set\fR \fIvarname\fR \fIelement\fR ?value?
-.sp
-\fBtsv::get\fR \fIvarname\fR \fIelement\fR ?namedvar?
-.sp
-\fBtsv::unset\fR \fIvarname\fR ?element?
-.sp
-\fBtsv::exists\fR \fIvarname\fR \fIelement\fR
-.sp
-\fBtsv::pop\fR \fIvarname\fR \fIelement\fR
-.sp
-\fBtsv::move\fR \fIvarname\fR \fIoldname\fR \fInewname\fR
-.sp
-\fBtsv::incr\fR \fIvarname\fR \fIelement\fR ?count?
-.sp
-\fBtsv::append\fR \fIvarname\fR \fIelement\fR \fIvalue\fR ?value \&.\&.\&.?
-.sp
-\fBtsv::lock\fR \fIvarname\fR \fIarg\fR ?arg \&.\&.\&.?
-.sp
-\fBtsv::handlers\fR
-.sp
-\fBtsv::lappend\fR \fIvarname\fR \fIelement\fR \fIvalue\fR ?value \&.\&.\&.?
-.sp
-\fBtsv::linsert\fR \fIvarname\fR \fIelement\fR \fIindex\fR \fIvalue\fR ?value \&.\&.\&.?
-.sp
-\fBtsv::lreplace\fR \fIvarname\fR \fIelement\fR \fIfirst\fR \fIlast\fR ?value \&.\&.\&.?
-.sp
-\fBtsv::llength\fR \fIvarname\fR \fIelement\fR
-.sp
-\fBtsv::lindex\fR \fIvarname\fR \fIelement\fR ?index?
-.sp
-\fBtsv::lrange\fR \fIvarname\fR \fIelement\fR \fIfrom\fR \fIto\fR
-.sp
-\fBtsv::lsearch\fR \fIvarname\fR \fIelement\fR ?options? \fIpattern\fR
-.sp
-\fBtsv::lset\fR \fIvarname\fR \fIelement\fR \fIindex\fR ?index \&.\&.\&.? \fIvalue\fR
-.sp
-\fBtsv::lpop\fR \fIvarname\fR \fIelement\fR ?index?
-.sp
-\fBtsv::lpush\fR \fIvarname\fR \fIelement\fR ?index?
-.sp
-\fBtsv::array set\fR \fIvarname\fR \fIlist\fR
-.sp
-\fBtsv::array get\fR \fIvarname\fR ?pattern?
-.sp
-\fBtsv::array names\fR \fIvarname\fR ?pattern?
-.sp
-\fBtsv::array size\fR \fIvarname\fR
-.sp
-\fBtsv::array reset\fR \fIvarname\fR \fIlist\fR
-.sp
-\fBtsv::array bind\fR \fIvarname\fR \fIhandle\fR
-.sp
-\fBtsv::array unbind\fR \fIvarname\fR
-.sp
-\fBtsv::array isbound\fR \fIvarname\fR
-.sp
-\fBtsv::keyldel\fR \fIvarname\fR \fIkeylist\fR \fIkey\fR
-.sp
-\fBtsv::keylget\fR \fIvarname\fR \fIkeylist\fR \fIkey\fR ?retvar?
-.sp
-\fBtsv::keylkeys\fR \fIvarname\fR \fIkeylist\fR ?key?
-.sp
-\fBtsv::keylset\fR \fIvarname\fR \fIkeylist\fR \fIkey\fR \fIvalue\fR ?key value\&.\&.?
-.sp
-.BE
-.SH DESCRIPTION
-This section describes commands implementing thread shared variables\&.
-A thread shared variable is very similar to a Tcl array but in
-contrast to a Tcl array it is created in shared memory and can
-be accessed from many threads at the same time\&. Important feature of
-thread shared variable is that each access to the variable is internaly
-protected by a mutex so script programmer does not have to take care
-about locking the variable himself\&.
-.PP
-Thread shared variables are not bound to any thread explicitly\&. That
-means that when a thread which created any of thread shared variables
-exits, the variable and associated memory is not unset/reclaimed\&.
-User has to explicitly unset the variable to reclaim the memory
-consumed by the variable\&.
-.SH "ELEMENT COMMANDS"
-.TP
-\fBtsv::names\fR ?pattern?
-Returns names of shared variables matching optional ?pattern?
-or all known variables if pattern is ommited\&.
-.TP
-\fBtsv::object\fR \fIvarname\fR \fIelement\fR
-Creates object accessor command for the \fIelement\fR in the
-shared variable \fIvarname\fR\&. Using this command, one can apply most
-of the other shared variable commands as method functions of
-the element object command\&. The object command is automatically
-deleted when the element which this command is pointing to is unset\&.
-.CS
-
-
-    % tsv::set foo bar "A shared string"
-    % set string [tsv::object foo bar]
-    % $string append " appended"
-    => A shared string appended
-
-.CE
-.TP
-\fBtsv::set\fR \fIvarname\fR \fIelement\fR ?value?
-Sets the value of the \fIelement\fR in the shared variable \fIvarname\fR
-to \fIvalue\fR and returns the value to caller\&. The \fIvalue\fR
-may be ommited, in which case the command will return the current
-value of the element\&. If the element cannot be found, error is triggered\&.
-.TP
-\fBtsv::get\fR \fIvarname\fR \fIelement\fR ?namedvar?
-Retrieves the value of the \fIelement\fR from the shared variable \fIvarname\fR\&.
-If the optional argument \fInamedvar\fR is given, the value is
-stored in the named variable\&. Return value of the command depends
-of the existence of the optional argument \fInamedvar\fR\&.
-If the argument is ommited and the requested element cannot be found
-in the shared array, the command triggers error\&. If, however, the
-optional argument is given on the command line, the command returns
-true (1) if the element is found or false (0) if the element is not found\&.
-.TP
-\fBtsv::unset\fR \fIvarname\fR ?element?
-Unsets the \fIelement\fR from the shared variable \fIvarname\fR\&.
-If the optional element is not given, it deletes the variable\&.
-.TP
-\fBtsv::exists\fR \fIvarname\fR \fIelement\fR
-Checks wether the \fIelement\fR exists in the shared variable \fIvarname\fR
-and returns true (1) if it does or false (0) if it doesn't\&.
-.TP
-\fBtsv::pop\fR \fIvarname\fR \fIelement\fR
-Returns value of the \fIelement\fR in the shared variable \fIvarname\fR
-and unsets the element, all in one atomic operation\&.
-.TP
-\fBtsv::move\fR \fIvarname\fR \fIoldname\fR \fInewname\fR
-Renames the element \fIoldname\fR to the \fInewname\fR in the
-shared variable \fIvarname\fR\&. This effectively performs an get/unset/set
-sequence of operations but all in one atomic step\&.
-.TP
-\fBtsv::incr\fR \fIvarname\fR \fIelement\fR ?count?
-Similar to standard Tcl \fBincr\fR command but increments the value
-of the \fIelement\fR in shared variaboe \fIvarname\fR instead of
-the Tcl variable\&.
-.TP
-\fBtsv::append\fR \fIvarname\fR \fIelement\fR \fIvalue\fR ?value \&.\&.\&.?
-Similar to standard Tcl \fBappend\fR command but appends one or more
-values to the \fIelement\fR in shared variable \fIvarname\fR instead of the
-Tcl variable\&.
-.TP
-\fBtsv::lock\fR \fIvarname\fR \fIarg\fR ?arg \&.\&.\&.?
-This command concatenates passed arguments and evaluates the
-resulting script under the internal mutex protection\&. During the
-script evaluation, the entire shared variable is locked\&. For shared
-variable commands within the script, internal locking is disabled
-so no deadlock can occur\&. It is also allowed to unset the shared
-variable from within the script\&. The shared variable is automatically
-created if it did not exists at the time of the first lock operation\&.
-.CS
-
-
-    % tsv::lock foo {
-        tsv::lappend foo bar 1
-        tsv::lappend foo bar 2
-        puts stderr [tsv::set foo bar]
-        tsv::unset foo
-    }
-
-.CE
-.TP
-\fBtsv::handlers\fR
-Returns the names of all persistent storage handlers enabled at compile time\&.
-See \fBARRAY COMMANDS\fR for details\&.
-.PP
-.SH "LIST COMMANDS"
-Those command are similar to the equivalently named Tcl command\&. The difference
-is that they operate on elements of shared arrays\&.
-.TP
-\fBtsv::lappend\fR \fIvarname\fR \fIelement\fR \fIvalue\fR ?value \&.\&.\&.?
-Similar to standard Tcl \fBlappend\fR command but appends one
-or more values to the \fIelement\fR in shared variable \fIvarname\fR
-instead of the Tcl variable\&.
-.TP
-\fBtsv::linsert\fR \fIvarname\fR \fIelement\fR \fIindex\fR \fIvalue\fR ?value \&.\&.\&.?
-Similar to standard Tcl \fBlinsert\fR command but inserts one
-or more values at the \fIindex\fR list position in the
-\fIelement\fR in the shared variable \fIvarname\fR instead of the Tcl variable\&.
-.TP
-\fBtsv::lreplace\fR \fIvarname\fR \fIelement\fR \fIfirst\fR \fIlast\fR ?value \&.\&.\&.?
-Similar to standard Tcl \fBlreplace\fR command but replaces one
-or more values between the \fIfirst\fR and \fIlast\fR position
-in the \fIelement\fR of the shared variable \fIvarname\fR instead of
-the Tcl variable\&.
-.TP
-\fBtsv::llength\fR \fIvarname\fR \fIelement\fR
-Similar to standard Tcl \fBllength\fR command but returns length
-of the \fIelement\fR in the shared variable \fIvarname\fR instead of the Tcl
-variable\&.
-.TP
-\fBtsv::lindex\fR \fIvarname\fR \fIelement\fR ?index?
-Similar to standard Tcl \fBlindex\fR command but returns the value
-at the \fIindex\fR list position of the \fIelement\fR from
-the shared variable \fIvarname\fR instead of the Tcl variable\&.
-.TP
-\fBtsv::lrange\fR \fIvarname\fR \fIelement\fR \fIfrom\fR \fIto\fR
-Similar to standard Tcl \fBlrange\fR command but returns values
-between \fIfrom\fR and \fIto\fR list positions from the
-\fIelement\fR in the shared variable \fIvarname\fR instead of the Tcl variable\&.
-.TP
-\fBtsv::lsearch\fR \fIvarname\fR \fIelement\fR ?options? \fIpattern\fR
-Similar to standard Tcl \fBlsearch\fR command but searches the \fIelement\fR
-in the shared variable \fIvarname\fR instead of the Tcl variable\&.
-.TP
-\fBtsv::lset\fR \fIvarname\fR \fIelement\fR \fIindex\fR ?index \&.\&.\&.? \fIvalue\fR
-Similar to standard Tcl \fBlset\fR command but sets the \fIelement\fR
-in the shared variable \fIvarname\fR instead of the Tcl variable\&.
-.TP
-\fBtsv::lpop\fR \fIvarname\fR \fIelement\fR ?index?
-Similar to the standard Tcl \fBlindex\fR command but in addition to
-returning, it also splices the value out of the \fIelement\fR
-from the shared variable \fIvarname\fR in one atomic operation\&.
-In contrast to the Tcl \fBlindex\fR command, this command returns
-no value to the caller\&.
-.TP
-\fBtsv::lpush\fR \fIvarname\fR \fIelement\fR ?index?
-This command performes the opposite of the \fBtsv::lpop\fR command\&.
-As its counterpart, it returns no value to the caller\&.
-.PP
-.SH "ARRAY COMMANDS"
-This command supports most of the options of the standard Tcl
-\fBarray\fR command\&. In addition to those, it allows binding
-a shared variable to some persisten storage databases\&. Currently the persistent
-options supported are the famous GNU Gdbm and LMDB\&. These options have to be
-selected during the package compilation time\&.
-The implementation provides hooks for defining other persistency layers, if
-needed\&.
-.TP
-\fBtsv::array set\fR \fIvarname\fR \fIlist\fR
-Does the same as standard Tcl \fBarray set\fR\&.
-.TP
-\fBtsv::array get\fR \fIvarname\fR ?pattern?
-Does the same as standard Tcl \fBarray get\fR\&.
-.TP
-\fBtsv::array names\fR \fIvarname\fR ?pattern?
-Does the same as standard Tcl \fBarray names\fR\&.
-.TP
-\fBtsv::array size\fR \fIvarname\fR
-Does the same as standard Tcl \fBarray size\fR\&.
-.TP
-\fBtsv::array reset\fR \fIvarname\fR \fIlist\fR
-Does the same as standard Tcl \fBarray set\fR but it clears
-the \fIvarname\fR and sets new values from the list atomically\&.
-.TP
-\fBtsv::array bind\fR \fIvarname\fR \fIhandle\fR
-Binds the \fIvarname\fR to the persistent storage \fIhandle\fR\&.
-The format of the \fIhandle\fR is <handler>:<address>, where <handler> is
-"gdbm" for GNU Gdbm and "lmdb" for LMDB and <address> is the path to the
-database file\&.
-.TP
-\fBtsv::array unbind\fR \fIvarname\fR
-Unbinds the shared \fIarray\fR from its bound persistent storage\&.
-.TP
-\fBtsv::array isbound\fR \fIvarname\fR
-Returns true (1) if the shared \fIvarname\fR is bound to some
-persistent storage or zero (0) if not\&.
-.PP
-.SH "KEYED LIST COMMANDS"
-Keyed list commands are borrowed from the TclX package\&. Keyed lists provide
-a structured data type built upon standard Tcl lists\&. This is a functionality
-similar to structs in the C programming language\&.
-.PP
-A keyed list is a list in which each element contains a key and value
-pair\&. These element pairs are stored as lists themselves, where the key
-is the first element of the list, and the value is the second\&. The
-key-value pairs are referred to as fields\&.  This is an example of a
-keyed list:
-.CS
-
-
-    {{NAME  {Frank  Zappa}} {JOB {musician and composer}}}
-
-.CE
-Fields may contain subfields; `\&.' is the separator character\&. Subfields
-are actually fields  where the value is another keyed list\&. Thus the
-following list has the top level fields ID and NAME, and subfields
-NAME\&.FIRST and NAME\&.LAST:
-.CS
-
-
-    {ID 106} {NAME {{FIRST Frank} {LAST Zappa}}}
-
-.CE
-There is no limit to the recursive depth of subfields,
-allowing one to build complex data structures\&. Keyed lists are constructed
-and accessed via a number of commands\&. All  keyed  list management
-commands take the name of the variable containing the keyed list as an
-argument (i\&.e\&. passed by reference), rather than passing the list directly\&.
-.TP
-\fBtsv::keyldel\fR \fIvarname\fR \fIkeylist\fR \fIkey\fR
-Delete the field specified by \fIkey\fR from the keyed list \fIkeylist\fR
-in the shared variable \fIvarname\fR\&.
-This removes both the key and the value from the keyed list\&.
-.TP
-\fBtsv::keylget\fR \fIvarname\fR \fIkeylist\fR \fIkey\fR ?retvar?
-Return the value associated with \fIkey\fR from the keyed list \fIkeylist\fR
-in the shared variable \fIvarname\fR\&.
-If the optional \fIretvar\fR is not specified, then the value will be
-returned as the result of the command\&. In this case, if key is not found
-in the list, an error will result\&.
-.sp
-If \fIretvar\fR is specified and \fIkey\fR is in the list, then the value
-is returned in the variable \fIretvar\fR and the command returns 1 if the
-key was present within the list\&. If \fIkey\fR isn't in the list, the
-command will return 0, and \fIretvar\fR will be left unchanged\&. If {} is
-specified for \fIretvar\fR, the value is not returned, allowing the Tcl
-programmer to determine if a \fIkey\fR is present in a keyed list without
-setting a variable as a side-effect\&.
-.TP
-\fBtsv::keylkeys\fR \fIvarname\fR \fIkeylist\fR ?key?
-Return  the a list of the keys in the keyed list \fIkeylist\fR in the
-shared variable \fIvarname\fR\&. If \fIkey\fR is specified, then it is
-the name of a key field who's subfield keys are to be retrieved\&.
-.TP
-\fBtsv::keylset\fR \fIvarname\fR \fIkeylist\fR \fIkey\fR \fIvalue\fR ?key value\&.\&.?
-Set the value associated with \fIkey\fR, in the keyed list \fIkeylist\fR
-to \fIvalue\fR\&. If the \fIkeylist\fR does not exists, it is created\&.
-If \fIkey\fR is not currently in the list, it will be added\&. If it already
-exists, \fIvalue\fR replaces the existing value\&. Multiple keywords and
-values may be specified, if desired\&.
-.PP
-.SH DISCUSSION
-The current implementation of thread shared variables allows for easy and
-convenient access to data shared between different threads\&.
-Internally, the data is stored in Tcl objects and all package commands
-operate on internal data representation, thus minimizing shimmering and
-improving performance\&. Special care has been taken to assure that all
-object data is properly locked and deep-copied when moving objects between
-threads\&.
-.PP
-Due to the internal design of the Tcl core, there is no provision of full
-integration of shared variables within the Tcl syntax, unfortunately\&. All
-access to shared data must be performed with the supplied package commands\&.
-Also, variable traces are not supported\&. But even so, benefits of easy,
-simple and safe shared data manipulation outweights imposed limitations\&.
-.SH CREDITS
-Thread shared variables are inspired by the nsv interface found in
-AOLserver, a highly scalable Web server from America Online\&.
-.SH "SEE ALSO"
-thread, tpool, ttrace
-.SH KEYWORDS
-locking, synchronization, thread shared data, threads