"An operation acting on shared memory is atomic if it completes in a single step relative to other threads. When an atomic store is performed on a shared memory, no other thread can …

Sep 6, 2018 · Here, each upsert is atomic: the first one left count at 2, the second one left it at 3. Everything works. Note that "atomic" is contextual: in this case, the upsert operation only …

Mar 27, 2013 · Atomic Operations on the other hand are usually associated with low-level programming with regards to multi-processing or multi-threading applications and are similar to …

Atomic operations leverage processor support (compare and swap instructions) and don't use locks at all, whereas locks are more OS-dependent and perform differently on, for example, …

Aug 10, 2012 · Generally I would suggest that one confine use of them to small methods like "atomic increment" and such, which could easily be rewritten if needed to use other …

Jun 4, 2014 · 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 …

Sep 18, 2023 · 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 …

Aug 13, 2015 · std::atomic<> wraps operations that, in pre-C++ 11 times, had to be performed using (for example) interlocked functions with MSVC or atomic bultins in case of GCC. Also, …

Jan 27, 2011 · For instance getAndIncrement() is an atomic equivalent to i++ which is not atomic because it is actually a short cut for three operations: retrieval, addition and assignation. …

The std::atomic<T> template deletes its copy-constructor, because atomics are for shared state, so copying them to another atomic is usually not what you want. Deleting the copy-constructor …