class EventMachine::Synchrony::TCPSocket

def closed?
  # In TCPSocket, 
  # closed? on a remotely closed socket, when we've not yet read EOF, returns false
  # closed? on a remotely closed socket, when we've read EOF, returns false
  # closed? on a socket after #close, returns true
  # Therefore, we set @close to true when #close is called, but not when unbind is. 
  @closed
end