class Puma::Cluster

def wait_workers
  # Reap all children, known workers or otherwise.
  # If puma has PID 1, as it's common in containerized environments,
  # then it's responsible for reaping orphaned processes, so we must reap
  # all our dead children, regardless of whether they are workers we spawned
  # or some reattached processes.
  reaped_children = {}
  loop do
    begin
      pid, status = Process.wait2(-1, Process::WNOHANG)
      break unless pid
      reaped_children[pid] = status
    rescue Errno::ECHILD
      break
    end
  end
  @workers.reject! do |w|
    next false if w.pid.nil?
    begin
      # When `fork_worker` is enabled, some worker may not be direct children, but grand children.
      # Because of this they won't be reaped by `Process.wait2(-1)`, so we need to check them individually)
      if reaped_children.delete(w.pid) || (@options[:fork_worker] && Process.wait(w.pid, Process::WNOHANG))
        true
      else
        w.term if w.term?
        nil
      end
    rescue Errno::ECHILD
      begin
        Process.kill(0, w.pid)
        # child still alive but has another parent (e.g., using fork_worker)
        w.term if w.term?
        false
      rescue Errno::ESRCH, Errno::EPERM
        true # child is already terminated
      end
    end
  end
  # Log unknown children
  reaped_children.each do |pid, status|
    log "! reaped unknown child process pid=#{pid} status=#{status}"
  end
end