//how to get the profile2 'pid' of the current user for $profile in the following function
function profile2_access_control_get_pac_acl_id($profile, $op) {

  $pac_acl_id = pac_acl_get_id_by_name('profile2_access_control', $op . '_' . $profile->pid);
  if (!$pac_acl_id) {
    $pac_acl_id = pac_acl_create_new_pac_acl('profile2_access_control', $op . '_' . $profile->pid);
  }
  return $pac_acl_id;
}