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vwait(n) Tcl Built-In Commands vwait(n)
vwait - Process events until a variable is written
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 varName has been set, the vwait command will return as soon as
the event handler that modified varName completes. varName must globally scoped (either
with a call to global for the varName, or with the full namespace path specification).
In some cases the vwait command may not return immediately after varName 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 vari-
able, 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 cannot return either.
event, variable, wait
Tcl 8.0 vwait(n)
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