c++利用互斥鎖實現讀寫鎖

標籤：IV   lock   互斥鎖   write   private   實現   --   就是   unlock   

很簡單就是在讀的時候把寫的鎖鎖住就好了

class readwrite_lock  {  public:      readwrite_lock()          : read_cnt(0)      {      }        void readLock()      {          read_mtx.lock();          if (++read_cnt == 1)              write_mtx.lock();            read_mtx.unlock();      }        void readUnlock()      {          read_mtx.lock();          if (--read_cnt == 0)              write_mtx.unlock();            read_mtx.unlock();      }        void writeLock()      {          write_mtx.lock();      }        void writeUnlock()      {          write_mtx.unlock();      }    private:      mutex read_mtx;      mutex write_mtx;      int read_cnt; // 已加讀鎖個數  };  

　　

c++利用互斥鎖實現讀寫鎖