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] Fortunately, the value initializing constructor of an integral atomic is constexpr, so the above leads to constant initialization 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. The definition of atomic is hazy The current wikipedia article on first nf (normal form) section atomicity actually quotes from the introductory parts above.
But atomic to what extent To my understanding an operation can be atomic What exactly is meant by making an object atomic 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.
Its seems to me that these two are the same thing.is that correct? 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. There are two atomic cas operations in c++11
The weak forms of the functions are allowed to fail spurio. Atomic_shared_ptr<> as a distinct type has an important efficiency advantage over the functions in [util.smartptr.shared.atomic] — it can simply store an additional atomic_flag (or similar) for the internal spinlock as usual for atomic<bigstruct>.
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