2007-04-25 ■ memo memo http://www.google.co.jp/search?q=Check+And+Set+%E3%82%A2%E3%83%AB%E3%82%B4%E3%83%AA%E3%82%BA%E3%83%A0&lr=lang_ja&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:ja:official&client=firefox-a