class Puma::ThreadPool

def spawn_thread
  @spawned += 1
  th = Thread.new(@spawned) do |spawned|
    Puma.set_thread_name '%s tp %03i' % [@name, spawned]
    todo  = @todo
    block = @block
    mutex = @mutex
    not_empty = @not_empty
    not_full = @not_full
    while true
      work = nil
      mutex.synchronize do
        while todo.empty?
          if @trim_requested > 0
            @trim_requested -= 1
            @spawned -= 1
            @workers.delete th
            not_full.signal
            Thread.exit
          end
          @waiting += 1
          if @out_of_band_pending && trigger_out_of_band_hook
            @out_of_band_pending = false
          end
          not_full.signal
          begin
            not_empty.wait mutex
          ensure
            @waiting -= 1
          end
        end
        work = todo.shift
      end
      if @clean_thread_locals
        ThreadPool.clean_thread_locals
      end
      begin
        @out_of_band_pending = true if block.call(work)
      rescue Exception => e
        STDERR.puts "Error reached top of thread-pool: #{e.message} (#{e.class})"
      end
    end
  end
  @workers << th
  th
end