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GCD Dispatch Sources

https://www.cnblogs.com/hlwfirst/p/5492493.html GCD dispatch_read  与 dispatch_write  文件读写

http://blog.sina.com.cn/s/blog_6d01cce30101hzws.html GCD Dispatch I/O

https://blog.csdn.net/u014205965/article/details/45922471 https://www.jianshu.com/p/da4710d76d33 GCD  dispatch_once

https://blog.csdn.net/yxys01/article/details/51579867 GCD  dispatch_set_target_queue 

https://blog.csdn.net/growinggiant/article/details/41077221