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2014-02-12 :-(

_ 午前

0530 起床

0830 出勤 || デバッグしTARI

_ 午後

1300 デバッグしTARI

_

1700 退勤

1900 マルチスレッドがどうのこうの

2100 飯

_ 買い物

iTunes Store

坂本真綾の曲を買うのは 10 年ぶりくらいか。

たぶんこの辺が最後。2003 年リリースだからほんとに 10 年だった。まあいろいろあった

B0035NO6LI

_ [Java][Ruby][マルチスレッド][デザインパターン]Java言語で学ぶデザインパターン入門マルチスレッド編 Single Threaded Execution - この橋を渡れるのは、たった一人

写経するために Ruby で書きなおしてみた。Java から Ruby へ

Ruby ぽく書ける箇所は多々あるんだろうけど愚直に 1 対 1 対応させる。

Java の Synchronize は Ruby には無いので Monitor を使う。

同時に 1 つのスレッドのみが処理を実行できる。クリティカルセクションとか呼ばれる

コード

# coding: utf-8

#
# 『増補改訂版Java言語で学ぶデザインパターン入門マルチスレッド編』 http://www.hyuki.com/dp/dp2.html
# 
# Single Threaded Execution - この橋を渡れるのは、たった一人
#

require 'thread'
require 'monitor'

class Gate
  def initialize()
    @counter = 0
    @name = "Nobody"
    @address = "Nowhere"
    @lock = Monitor.new
  end

  def pass(name, address)
    @lock.synchronize {
      @counter += 1
      @name = name
      @address = address
      check()
    }
  end

  def to_s()
    @lock.synchronize {
      return "No. #{@counter}: #{@name} #{@address}"
    }
  end
  
  def check()
    puts to_s()
    if @name[0] != @address[0]
      puts "***** BROKEN ***** " + to_s()
    end
  end
end

class UserThread < Thread
  def initialize(gate, myname, myaddress)
    @gate = gate
    @myname = myname
    @myaddress = myaddress
    
    super() {
      puts @myname + " BEGIN"
      while true
        @gate.pass(@myname, @myaddress)
        sleep(1)
      end
    }
    
  end
end

def main(argv)
  gate = Gate.new
  threads ||= []

  threads << UserThread.new(gate, "Alice", "Alaska")
  threads << UserThread.new(gate, "Bobby", "Brazil")
  threads << UserThread.new(gate, "Chris", "Canada")
  threads.each {|t|
    t.join()
  }
end

main(ARGV)
% ruby SingleThreadedExecution.rb
Alice BEGIN
No. 1: Alice Alaska
Bobby BEGIN
No. 2: Bobby Brazil
Chris BEGIN
No. 3: Chris Canada
No. 4: Alice Alaska
No. 5: Bobby Brazil
No. 6: Chris Canada
No. 7: Chris Canada
No. 8: Bobby Brazil
No. 9: Alice Alaska
No. 10: Chris Canada
No. 11: Alice Alaska
No. 12: Bobby Brazil
No. 13: Alice Alaska
No. 14: Bobby Brazil
No. 15: Chris Canada
No. 16: Chris Canada
No. 17: Alice Alaska
No. 18: Bobby Brazil
以下略

著作権

Copyright (C) 2002,2006 Hiroshi Yuki.
http://www.hyuki.com/dp/dp2.html
hyuki@hyuki.com

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it freely,
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim
that you wrote the original software. If you use this software in a product,
an acknowledgment in the product documentation would be appreciated but is not
required.

2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

参考

『増補改訂版Java言語で学ぶデザインパターン入門マルチスレッド編』

4797331623