For anyone else on linux looking for this documentation that doesn't exist. 
$main_window->configure( -cursor => 'watch' );
Tkx::update();

long_routine();

$main_window->configure( -cursor => 'top_left_arrow' );
Tkx::update();

[download]

In reply to Re^4: use Tkx & busy/unbusy ( $mw->g_tk_busy ) by Keystroke
in thread use Tkx & busy/unbusy by dallen16

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