Multi-Threading on multi core architecture?

Even on a single core, you cannot assume that an operation will be atomic. That may be the case where you're coding in assembler but, if you are coding in C++ as per your question, you do not know what it will compile down to.

It will have the same pitfalls as with a single core but with additional latency due to the L1 cache synchronization that must take place between cores.

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