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require "thread"

require "timeout"

def calc_fib(n)

  if n == 0

    0

  elsif n == 1

    1

  else

    calc_fib(n-1) + calc_fib(n-2)

  end

end

lock = Mutex.new

threads = 20.times.collect do

  Thread.new do

    20.times do

      begin

        Timeout.timeout(0.25) do

          lock.synchronize{ calc_fib(1000) }

        end

      rescue ThreadError => e

        puts "#{e.class}: #{e.message}:\n" + e.backtrace.join("\n") + "\n\n"

      rescue Timeout::Error => e

        #puts e.class

        nil

      end

    end

  end

end

threads.each{ |t| t.join }