Hello monks

What I'd like: Bind time (clock) events to my program. Let's take this very simple (and poor) program. It's a basic stopwatch (only seconds). Clicking on Start will start counting, clicking on Stop...of course it stops. Counting is the 1st (and only) process. The GUI can be used thanks windows->update. Yet, this makes the app not responsive. If I had sleep 10 (instead of 1), the GUI would respond only every 10 seconds (always updating needs to many resources?). I'd like it to be any time ready to respond.

Now, what is the best approach to solve this? I've no experience with fork. Is fork the right way? Any suggestion would be very appreciated

#!/usr/bin/perl

use Tk;
use strict;

my $count=0;

my $window = MainWindow->new;
$window->title("My Example");
$window->Label(-textvariable => \$count )->pack;
$window->Button(-text => "Start", -command => \&start )->pack;
$window->Button(-text => "Stop", -command => \&stop )->pack;
MainLoop;

#########################################################
my $stop;

sub start {
  while ($count <= 10) {
    $window->update;    
    $count ++;  
    sleep 1;
      if ($stop =~ 1) {
        $stop=0;
        $count=0;
        return;
      }
  }
}

sub stop{
$stop=1;
}
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