Atomic Radius Table

Understanding atomic radius table requires examining multiple perspectives and considerations. What does "atomic" mean in programming? In the Effective Java book, it states: 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]. c++ - What exactly is std::atomic?

Objects of atomic types are the only C++ objects that are free from data races; that is, if one thread writes to an atomic object while another thread reads from it, the behavior is well-defined. Similarly, in addition, accesses to atomic objects may establish inter-thread synchronization and order non-atomic memory accesses as specified by std::memory_order. c++ - How to implement an atomic counter - Stack Overflow. std::atomic<int> id{0}; int create_id() { id++; return id.load(); } But I assume it's possible for that function to return the same value twice, right?

For example, thread A calls the function, increments the value, but then halts while thread B comes in and also increments the value, finally A and B both return the same value. So using mutexes, the function might look like this: What are atomic operations for newbies? In this context, 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.

Is there a difference between the _Atomic type qualifier and type .... Why the standard make that difference? It seems as both designate, in the same way, an atomic type. What is the difference between std::shared_ptr and std::atomic<std .... 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>.

c++ - Are +=, |=, &= etc atomic? 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.

This perspective suggests that, if you want atomic operations, you should use the appropiate calls, not the ... sql - What is atomicity in dbms - Stack Overflow. The definition of atomic is hazy; a value that is atomic in one application could be non-atomic in another. For a general guideline, a value is non-atomic if the application deals with only a part of the value.

In this context, eg: The current Wikipedia article on First NF (Normal Form) section Atomicity actually quotes from the introductory parts above. It's important to note that, when do I really need to use atomic<bool> instead of bool?. You need atomic<bool> to avoid race-conditions. A race-condition occurs if two threads access the same memory location, and at least one of them is a write operation. If your program contains race-conditions, the behavior is undefined. c++ - How to use std::atomic efficiently - Stack Overflow.