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How to atomically perform sequential load and store operations?
Consider this code under GCC 4.8.0:std::atomic<bool> a;std::atomic<bool> b;a.store( b.load() ); // want to be atomicHow can I make the line above to be atomic as whole? In other words, how...
View ArticleAnswer by wilx for How to atomically perform sequential load and store...
I do not think that is possible. I do not think it is useful to have such operation. Why do you want it? If you have such hard requirement then you should just use std::mutex locked around a = b...
View ArticleAnswer by Krzysztof Narkowicz for How to atomically perform sequential load...
In theory atomic variable swap could be implemented on a few CPUs with DCAS support. In practice no modern CPU has DCAS support, so it's not possible.
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