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  1. or download this
      ...
  $kernel->yield('keepalive', $io_wheel, $kernel);
  ....
  2. or download this
      ...
  keepalive => sub {
    my ( $io_wheel, $kernel ) = @_[ ARG0, ARG1 ];
  ....
  3. or download this
      keepalive => sub {
      my ( $io_wheel, $kernel ) = @_[ ARG0, KERNEL ];
      $io_wheel->put( "keepalive" );
      $kernel->delay( 'keepalive' => 10, $io_wheel );
  },