dispatch_once #12

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on Mar 30, 2017

在第7篇讲述信号量的文章中说通过dispatch_once 来保证避免线程的竞争，哪里有竞争的地方啊，没有看到同时操作代码块的地方也没有读取同一块数据的地方，大神请解释一下

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