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           1. Lock(object) ¶ÔÐèҪͬ²½µÄ´úÂë¿é¼ÓËø£»
¡¡¡¡¡¡¡¡2. Monitor Class
¡¡¡¡¡¡¡¡3. ReaderWriterLock Class¡¡¡¡¡¡
           4. Mutex Class
           5. Semaphore
           6. Event
      Õâ´ÎÎÒÖ÷Ҫ˵һÏ Lock ºÍ Monitor¡£¶ÔÓÚLock Ïë±ØÓÐÒ»¶¨¶àÏ̱߳à³Ì¾­ÑéµÄ³ÌÐòÔ±¶¼»áºÜÊìϤ£¬¿´Ãû×Ö¾ÍÖªµÀ´ó¸ÅÊÇʲôÒâ˼ÁË¡£Lock ¾ÍÊÇÒ»°ÑËø£¬¾Ù¸öºÜ²»ÑŵÃÀý×Ó¡£±ÈÈç˵ÎÒÃÇÈ¥ÉÏWC£¬µ±Äã½øÈ¥ºó¾ÍÒª°ÑÃÅËø×¡£¬ºóÀ´µÄÈËÖ»ÄܵÈÄã·½±ãÍêÁ˲ÅÄܽøÈ¥¡£
private string lockFlag = "LOCK";
        public void GoWC(Person p)
        {
            lock (lockFlag)
            {
                Console.WriteLine("Begin");
                  Console.WriteLine("End");
            }
        }
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