openglnewbee的博客

http://www.cocoachina.com/applenews/devnews/2013/1210/7506_2.html

我们这里重点讨论的是线程安全，而不是单例的严格实现（若需要严格实现还需要复写一些方法，更改一些实现代码）：gcd实现：  static AccountManager *sharedAccountManagerInstance = nil; + (AccountManager *)sharedManager {      static dispatch_once_t

http://www.cocoachina.com/applenews/devnews/2013/1212/7525.html

a.使用gcd   //切换到线程中执行            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{                // Do the work in background                [[MyManager shareIns

http://www.cnblogs.com/zhidao-chen/archive/2013/03/21/2973329.html

http://blog.sina.com.cn/s/blog_7b9d64af0101c75e.html