I do not know why, seems strange object interface, but the following seems to work (experimental Perl): 

    waitVariableX ($mw, 5 * 1000, \$unchanged_var);    # sleep 5 secon
+ds

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In reply to Re: Tk::waitVariableX - AUTOLOAD failed by hdb
in thread Tk::waitVariableX - AUTOLOAD failed by jowe

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