比较和交换vs测试和设置 [英] compare and swap vs test and set

问题描述

有人可以向我解释多线程中上述操作的工作和差异吗？

Could someone explain to me the working and differences of above operations in multi-threading?

推荐答案

test-and-set 修改内存位置的内容，并将其旧值作为单个原子操作返回。

test-and-set modifies the contents of a memory location and returns its old value as a single atomic operation.

compare-and-swap 以原子方式将内存位置的内容与给定值进行比较，

compare-and-swap atomically compares the contents of a memory location to a given value and, only if they are the same, modifies the contents of that memory location to a given new value.

以粗体标示的差异。

The difference marked in bold.

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