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学习GCD看我就够了
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计算机在运行一段程序的时候，会把该程序的CPU命令列配置到内存中，然后按照顺序一个一个执行命令列，这样1个CPU执行的CPU命令列为一条无分叉路径就是线程。而有多条这样的执行指令列的路径存在时即为多线程。
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