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-'\"
-'\" Copyright (c) 1990-1994 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH after n 7.5 Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-after \- Execute a command after a time delay
-.SH SYNOPSIS
-\fBafter \fIms\fR
-.sp
-\fBafter \fIms \fR?\fIscript script script ...\fR?
-.sp
-\fBafter cancel \fIid\fR
-.sp
-\fBafter cancel \fIscript script script ...\fR
-.sp
-\fBafter idle \fR?\fIscript script script ...\fR?
-.sp
-\fBafter info \fR?\fIid\fR?
-.BE
-.SH DESCRIPTION
-.PP
-This command is used to delay execution of the program or to execute
-a command in background sometime in the future.  It has several forms,
-depending on the first argument to the command:
-.TP
-\fBafter \fIms\fR
-.
-\fIMs\fR must be an integer giving a time in milliseconds.
-The command sleeps for \fIms\fR milliseconds and then returns.
-While the command is sleeping the application does not respond to
-events.
-.TP
-\fBafter \fIms \fR?\fIscript script script ...\fR?
-.
-In this form the command returns immediately, but it arranges
-for a Tcl command to be executed \fIms\fR milliseconds later as an
-event handler.
-The command will be executed exactly once, at the given time.
-The delayed command is formed by concatenating all the \fIscript\fR
-arguments in the same fashion as the \fBconcat\fR command.
-The command will be executed at global level (outside the context
-of any Tcl procedure).
-If an error occurs while executing the delayed command then
-the background error will be reported by the command
-registered with \fBinterp bgerror\fR.
-The \fBafter\fR command returns an identifier that can be used
-to cancel the delayed command using \fBafter cancel\fR.
-.TP
-\fBafter cancel \fIid\fR
-.
-Cancels the execution of a delayed command that
-was previously scheduled.
-\fIId\fR indicates which command should be canceled;  it must have
-been the return value from a previous \fBafter\fR command.
-If the command given by \fIid\fR has already been executed then
-the \fBafter cancel\fR command has no effect.
-.TP
-\fBafter cancel \fIscript script ...\fR
-.
-This command also cancels the execution of a delayed command.
-The \fIscript\fR arguments are concatenated together with space
-separators (just as in the \fBconcat\fR command).
-If there is a pending command that matches the string, it is
-canceled and will never be executed;  if no such command is
-currently pending then the \fBafter cancel\fR command has no effect.
-.TP
-\fBafter idle \fIscript \fR?\fIscript script ...\fR?
-.
-Concatenates the \fIscript\fR arguments together with space
-separators (just as in the \fBconcat\fR command), and arranges
-for the resulting script to be evaluated later as an idle callback.
-The script will be run exactly once, the next time the event
-loop is entered and there are no events to process.
-The command returns an identifier that can be used
-to cancel the delayed command using \fBafter cancel\fR.
-If an error occurs while executing the script then the
-background error will be reported by the command
-registered with \fBinterp bgerror\fR.
-.TP
-\fBafter info \fR?\fIid\fR?
-.
-This command returns information about existing event handlers.
-If no \fIid\fR argument is supplied, the command returns
-a list of the identifiers for all existing
-event handlers created by the \fBafter\fR command for this
-interpreter.
-If \fIid\fR is supplied, it specifies an existing handler;
-\fIid\fR must have been the return value from some previous call
-to \fBafter\fR and it must not have triggered yet or been canceled.
-In this case the command returns a list with two elements.
-The first element of the list is the script associated
-with \fIid\fR, and the second element is either
-\fBidle\fR or \fBtimer\fR to indicate what kind of event
-handler it is.
-.LP
-The \fBafter \fIms\fR and \fBafter idle\fR forms of the command
-assume that the application is event driven:  the delayed commands
-will not be executed unless the application enters the event loop.
-In applications that are not normally event-driven, such as
-\fBtclsh\fR, the event loop can be entered with the \fBvwait\fR
-and \fBupdate\fR commands.
-.SH "EXAMPLES"
-This defines a command to make Tcl do nothing at all for \fIN\fR
-seconds:
-.PP
-.CS
-proc sleep {N} {
-    \fBafter\fR [expr {int($N * 1000)}]
-}
-.CE
-.PP
-This arranges for the command \fIwake_up\fR to be run in eight hours
-(providing the event loop is active at that time):
-.PP
-.CS
-\fBafter\fR [expr {1000 * 60 * 60 * 8}] wake_up
-.CE
-.PP
-The following command can be used to do long-running calculations (as
-represented here by \fI::my_calc::one_step\fR, which is assumed to
-return a boolean indicating whether another step should be performed)
-in a step-by-step fashion, though the calculation itself needs to be
-arranged so it can work step-wise.  This technique is extra careful to
-ensure that the event loop is not starved by the rescheduling of
-processing steps (arranging for the next step to be done using an
-already-triggered timer event only when the event queue has been
-drained) and is useful when you want to ensure that a Tk GUI remains
-responsive during a slow task.
-.PP
-.CS
-proc doOneStep {} {
-    if {[::my_calc::one_step]} {
-        \fBafter idle\fR [list \fBafter\fR 0 doOneStep]
-    }
-}
-doOneStep
-.CE
-.SH "SEE ALSO"
-concat(n), interp(n), update(n), vwait(n)
-.SH KEYWORDS
-cancel, delay, idle callback, sleep, time
-'\" Local Variables:
-'\" mode: nroff
-'\" End: