celluloid/nio4r — pull request #48 by avsej (2014-08-30 20:28:04+00:00)
Title: Remove ruby warning

```ruby
require 'nio'
selector = NIO::Selector.new
socket = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
selector.register(socket, :w) # !> instance variable lock_holder not initialized
```