dhclient and pid file

Hi

I just noticed that dhclient takes 'ages' to write it's pidfile.
Shell-constructs similar to this

  dhclient -q -1 -pf /etc/dhclient.pid fxp0 
  [ -e /etc/dhclient.pid ] && kill -9 `cat /etc/dhclient.pid`

do not work because dhclient is too slow in writing its pid file.

is this the expected behaviour with pid-file writing daemons?

thanks, t.