thread_pool_github.rb

class ThreadPool
  def initialize(size)
    @size = size
    @jobs = Queue.new
    @pool = Array.new(@size) do |i|
      Thread.new do
        Thread.current[:id] = i
        catch(:exit) do
          loop do
            job, args = @jobs.pop
            job.call(*args)
          end
        end
      end
    end
  end

  def schedule(*args, &block)
    @jobs << [block, args]
  end

  def run!
    @size.times do
      schedule { throw :exit }
    end
    @pool.map(&:join)
  end
end

require 'net/http'
pool = ThreadPool.new(25)
200.times { |i| pool.schedule { p Net::HTTP.get(URI("https://api.github.com/users?since=#{i}"))  } }
# congratulations you are ratelimited 😅
pool.run!