Tk::waitVariableX - a waitVariable with extensions.

       Copyright (C) 2000 - 2002 Stephen O. Lidie. All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

Tk1.0                                              2022-06-28                                 waitVariableX(3pm)

       This subroutine waits for a list of variables, with a timeout - the subroutine returns when one of the
       variables changes value or the timeout expires, whichever occurs first.

       Although the millisecond parameter is required, it may be zero, which effects no timeout. The milliscond
       paramter may also be an array of two elements, the first the millisecond value, and the second a normal
       Per/Tk callback. The callback is invoked just before waitVariableX returns.

       Callback format is patterned after the Perl/Tk scheme: supply either a code reference, or, supply an
       array reference and pass the callback code reference in the first element of the array, followed by
       callback arguments.

       Tk::waitVariableX - a waitVariable with extensions.

        use Tk::waitVariableX;

        $splash->waitVariableX( [$millis, $destroy_splashscreen], \$v1, \$v2} );