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被遗弃的线程
source link: http://sindrilin.com/note/2018/04/14/abandoned_thread/?
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main函数作为程序运行的入口，正常情况下，函数会执行毫秒级别的操作，然后返回一个0表示程序正常终止。为了避免应用启动即终止，苹果设计了runloop机制来维持线程的生命，runloop在每一次的循环当中不断的去处理事件，或控制线程的休眠和唤醒。runloop还结合了libdispatch的任务派发机制，可以循环地处理async到队列中的任务
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