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vwait(n)		     Tcl Built-In Commands		      vwait(n)

______________________________________________________________________________

NAME
       vwait - Process events until a variable is written

SYNOPSIS
       vwait varName
_________________________________________________________________

DESCRIPTION
       This  command enters the Tcl event loop to process events, blocking the
       application if no events are ready.   It	 continues  processing	events
       until some event handler sets the value of variable varName.  Once var‐
       Name has been set, the vwait command will return as soon as  the	 event
       handler that modified varName completes.

       In  some	 cases the vwait command may not return immediately after var‐
       Name is set.  This can happen if the event handler  that	 sets  varName
       does  not  complete immediately.	 For example, if an event handler sets
       varName and then itself calls vwait to wait for a  different  variable,
       then it may not return for a long time.	During this time the top-level
       vwait is blocked waiting for the event handler to complete, so it  can‐
       not return either.

KEYWORDS
       event, variable, wait

Tcl				      7.5			      vwait(n)

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                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 

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