The language specification guarantees that reading or writing a variable is atomic unless the variable is of type long or double [jls, 17.4.7] So are the following practice common and efficient Fortunately, the value initializing constructor of an integral atomic is constexpr, so the above leads to constant initialization
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Objects of atomic types are the only c++ objects that are free from data races
2 ++ might be atomic on your compiler/platform, but in the c++ specs it is not defined to be atomic
If you want to make sure to modify a value in an atomic way, you should use the appropiate methods, like interlocked* on windows Same for all the other routines If you want atomic operations, you should use the appropiate calls, not the. You can declare an atomic integer like this
The _atomic keyword can be used in the form _atomic(t), where t is a type, as a type specifier equivalent to _atomic t Declares x and y with the same type, even if t is a pointer type This allows for trivial c++0x compatibility with a c++ only. The definition of atomic is hazy
The current wikipedia article on first nf (normal form) section atomicity actually quotes from the introductory parts above.
Note that atomic is contextual In this case, the upsert operation only needs to be atomic with respect to operations on the answers table in the database The computer can be free to do other things as long as they don't affect (or are affected by) the result of what upsert is trying to do. I remember i came across certain types in the c language called atomic types, but we have never studied them
So, how do they differ from regular types like int,float,double,long etc., and what are. Std::atomic is new feature introduced by c++11 but i can't find much tutorial on how to use it correctly
