哪些CPU体系结构支持比较和交换(CAS)? [英] Which CPU architectures support Compare And Swap (CAS)?

问题描述

只是好奇地知道哪些CPU体系结构支持比较和交换原子基元?

just curious to know which CPU architectures support compare and swap atomic primitives?

推荐答案

Powerpc具有更强大的原语:"lwarx"和"stwcx"

Powerpc has more powerful primitives available: "lwarx" and "stwcx"

lwarx从内存中加载一个值，但会记住该位置.任何其他触摸该位置的线程或CPU都会导致条件存储指令"stwcx"失败.

lwarx loads a value from memory but remembers the location. Any other thread or cpu that touches that location will cause the "stwcx", a conditional store instruction, to fail.

因此lwarx/stwcx组合允许您实现原子增量/减量，比较和交换，以及更强大的原子操作，例如原子增量循环缓冲区索引"

So the lwarx /stwcx combo allows you to implement atomic increment / decrement, compare and swap, and more powerful atomic operations like "atomic increment circular buffer index"

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