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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
What are atomic operations for newbies? - Stack Overflow Everything works 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
What are atomic types in the C language? - Stack Overflow 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
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
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
reference assignment is atomic so why is Interlocked. Exchange(ref . . . reference assignment is atomic so why is Interlocked Exchange (ref Object, Object) needed? Reference assignment is atomic Interlocked Exchange does not do only reference assignment It does a read of the current value of a variable, stashes away the old value, and assigns the new value to the variable, all as an atomic operation
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
c++ - what is the difference between ++, add operation and fetch_add . . . 33 ++cnt and cnt fetch_add(1) are truly atomic operations One thread is blocked while the other thread reads, increments, and updates the value As such, the two threads cannot step on each other's toes Access to cnt is fully serialized, and the final result is as you would expect cnt = cnt+1; is not fully atomic