Detecting lost connections in TCPServer connection

I have some code similar to the following:

#!/usr/bin/env ruby

require 'socket'

server = TCPServer.new('localhost', 2000)

loop do
  Thread.start(server.accept) do |client|
    puts 'Client connects'

    loop do
      s = client.gets
      break if s.index('quit') == 0
      client.puts "Hello #{s}"
    end

    puts 'Client disconnects'

    client.close
  end
end

When this runs a new connection will spawn a new thread. If the user sends
the string starting with 'quit' then the connection will close

But if the use just terminates their session then the thread is left idle
waiting for input from a connection that no one is on the other end of.
Eventually I will end up with 100s of threads with no one to talk to

Is there a way for these threads to detect that the connection has been
lost? As opposed to someone just taking a very long time to communicate


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