Didn't notice this on my first read, but this is by Martin Sustrik. Sustrik is a former ZeroMQ contributor and, more recently, author of the abandoned zmq alternative nanomsg [1], as well as the libmill [2] and libdill [3] lightweight concurrency libraries.

  [1] http://nanomsg.org/
  [2] http://libmill.org/
  [3] http://libdill.org/