iOS多線程編程

iOS多線程編程之NSThread的使用

http://blog.csdn.net/totogo2010/article/details/8010231

線程專題總結

http://www.cocoachina.com/bbs/read.php?tid=43852

NSOperation和NSOperationQueue

http://blog.csdn.net/mengtnt/article/details/6950043

iOS系統GCD學習(5):信號量機制

http://blog.csdn.net/asunchaofan/article/details/8457905