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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 implement an atomic counter - Stack Overflow Fortunately, the value initializing constructor of an integral atomic is constexpr, so the above leads to constant initialization Otherwise you'd want to make it -say- a static member of a class that is wrapping this and put the initialization somewhere else
What does atomic mean in programming? - Stack Overflow 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] What do
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
How to initialize a static std::atomic data member 0 Since std::atomic_init has been deprecated in C++20, here is a reimplementation which does not raise deprecation warnings, if you for some reason want to keep doing this
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
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
How to initialize a std::atomic_flag data member in a constructor 16 What is a safe way to initialize an std::atomic_flag in a class constructor? how do I initialise an atomic_flag variable if it is a member of a class? seems to be asking the same question I'm asking - except here the asker is complaining about a compiler problem My question relates to the C++ standard 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