TODO

   1 for 1.0
   2 =======
   3 review functionality missing over 0.1
   4 serialization of handle_events
   5
   6 for 1.1 or future
   7 ==================
   8 optional timerfd support (runtime detection)
   9 notifications of hotplugged/unplugged devices
  10 offer API to create/destroy handle_events thread
  11 isochronous sync I/O?