message: Fixed warnings in Windows
diff: +#![allow(unused_imports)]
  +
  use std::io;
  use libc;
  @@ -35,6 +37,6 @@ pub fn monitor_signal(handle: &Handle) {
  }
  #[cfg(not(unix))]
  -pub fn monitor_signal(handle: &Handle) {
  +pub fn monitor_signal(_handle: &Handle) {
  // FIXME: Do nothing ...
  }
  