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- c++ - What exactly is std::atomic? - Stack Overflow
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 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 use std::atomic efficiently - Stack Overflow
std::atomic is new feature introduced by c++11 but I can't find much tutorial on how to use it correctly So are the following practice common and efficient? One practice I used is we have a buff
- 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
- 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 Eg: The current Wikipedia article on First NF (Normal Form) section Atomicity actually quotes from the introductory parts above
- What is the difference between std::shared_ptr and std::atomic lt;std . . .
The atomic "thing" in shared_ptr is not the shared pointer itself, but the control block it points to meaning that as long as you don't mutate the shared_ptr across multiple threads, you are ok do note that copying a shared_ptr only mutates the control block, and not the shared_ptr itself
- Whats the difference between the atomic and nonatomic attributes?
The last two are identical; "atomic" is the default behavior (note that it is not actually a keyword; it is specified only by the absence of nonatomic -- atomic was added as a keyword in recent versions of llvm clang) Assuming that you are @synthesizing the method implementations, atomic vs non-atomic changes the generated code If you are writing your own setter getters, atomic nonatomic
- In C#, what does atomic mean? - Stack Overflow
I read this in the book C# 6 0 and the NET 4 6 framework: “assignments and simple arithmetic operations are not atomic” So, what does it exactly mean?
- When do I really need to use atomic lt;bool gt; 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
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