晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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#
#   mutex_m.rb -
#       $Release Version: 3.0$
#       $Revision: 1.7 $
#       Original from mutex.rb
#       by Keiju ISHITSUKA(keiju@ishitsuka.com)
#       modified by matz
#       patched by akira yamada
#
# --
#   Usage:
#       require "mutex_m.rb"
#       obj = Object.new
#       obj.extend Mutex_m
#       ...
#       extended object can be handled like Mutex
#       or
#       class Foo
#         include Mutex_m
#         ...
#       end
#       obj = Foo.new
#       this obj can be handled like Mutex
#

require 'thread'

module Mutex_m
  def Mutex_m.define_aliases(cl)
    cl.module_eval %q{
      alias locked? mu_locked?
      alias lock mu_lock
      alias unlock mu_unlock
      alias try_lock mu_try_lock
      alias synchronize mu_synchronize
    }
  end

  def Mutex_m.append_features(cl)
    super
    define_aliases(cl) unless cl.instance_of?(Module)
  end

  def Mutex_m.extend_object(obj)
    super
    obj.mu_extended
  end

  def mu_extended
    unless (defined? locked? and
            defined? lock and
            defined? unlock and
            defined? try_lock and
            defined? synchronize)
      Mutex_m.define_aliases(singleton_class)
    end
    mu_initialize
  end

  # locking
  def mu_synchronize(&block)
    @_mutex.synchronize(&block)
  end

  def mu_locked?
    @_mutex.locked?
  end

  def mu_try_lock
    @_mutex.try_lock
  end

  def mu_lock
    @_mutex.lock
  end

  def mu_unlock
    @_mutex.unlock
  end

  def sleep(timeout = nil)
    @_mutex.sleep(timeout)
  end

  private

  def mu_initialize
    @_mutex = Mutex.new
  end

  def initialize(*args)
    mu_initialize
    super
  end
end