Note this API change in eventmachine for 0.12.10:

 - added EM.watch for notifications about file descriptors
      for notify_read/writable events, you cannot use EM.attach
      EM.watch(fd, Watcher){ |c| c.notify_readable = true }

Because of this change, neverblock quit working with EM 0.12.10. I was getting a "notify_readable/writable with EM.attach is not supported... " error.

I'm not sure if this is the only change that needed to be made, but I changed line 16 in lib/neverblock/db/fibered_db_connection.rb from:

@fiber[key] = EM::attach(socket,EMConnectionHandler,self)

to:

@fiber[key] = EM::watch(socket,EMConnectionHandler,self) { |c| c.notify_readable = true }

It seems like everything is working for me now.

-- Evan Owen