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-'\"
-'\" Copyright (c) 1990-1992 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 update n 7.5 Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-update \- Process pending events and idle callbacks
-.SH SYNOPSIS
-\fBupdate\fR ?\fBidletasks\fR?
-.BE
-.SH DESCRIPTION
-.PP
-This command is used to bring the application
-.QW "up to date"
-by entering the event loop repeatedly until all pending events
-(including idle callbacks) have been processed.
-.PP
-If the \fBidletasks\fR keyword is specified as an argument to the
-command, then no new events or errors are processed;  only idle
-callbacks are invoked.
-This causes operations that are normally deferred, such as display
-updates and window layout calculations, to be performed immediately.
-.PP
-The \fBupdate idletasks\fR command is useful in scripts where
-changes have been made to the application's state and you want those
-changes to appear on the display immediately, rather than waiting
-for the script to complete.  Most display updates are performed as
-idle callbacks, so \fBupdate idletasks\fR will cause them to run.
-However, there are some kinds of updates that only happen in
-response to events, such as those triggered by window size changes;
-these updates will not occur in \fBupdate idletasks\fR.
-.PP
-The \fBupdate\fR command with no options is useful in scripts where
-you are performing a long-running computation but you still want
-the application to respond to events such as user interactions;  if
-you occasionally call \fBupdate\fR then user input will be processed
-during the next call to \fBupdate\fR.
-.SH EXAMPLE
-.PP
-Run computations for about a second and then finish:
-.PP
-.CS
-set x 1000
-set done 0
-after 1000 set done 1
-while {!$done} {
-    # A very silly example!
-    set x [expr {log($x) ** 2.8}]
-
-    # Test to see if our time-limit has been hit.  This would
-    # also give a chance for serving network sockets and, if
-    # the Tk package is loaded, updating a user interface.
-    \fBupdate\fR
-}
-.CE
-.SH "SEE ALSO"
-after(n), interp(n)
-.SH KEYWORDS
-asynchronous I/O, event, flush, handler, idle, update