Objective C - nonatomic & atomic:
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nonatomic 非原子性. 在多线程下不安全.但是目前我们写的大多数程序都是 单线程的.
atomic 原子性 在多线程下安全.但是耗费的资源多. 其实就是 加锁. 比如在程序中有两个 对象 访问 同一块地方. 存在先后的问题. 一个对象先访问了一块内存.会加锁.
另一个对象看到后 会等待 或者 使用别的内存地址.
用完后 解锁. 然后该内存下一个对象才能使用.
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