c++ - What exactly is std::atomic? - Stack Overflow
Aug 13, 2015 · 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. …
What are atomic types in the C language? - Stack Overflow
Apr 30, 2016 · 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 …
c++ - Cross-platform Support for 128-bit Atomic Operations in Clang ...
Jun 19, 2025 · We are currently evaluating 128-bit atomic operation support across platforms and compilers, and I wanted to confirm the level of support available in Clang specifically. Our reference …
std::atomic | compare_exchange_weak vs. compare_exchange_strong
std::atomic | compare_exchange_weak vs. compare_exchange_strong [duplicate] Ask Question Asked 15 years, 1 month ago Modified 5 years, 3 months ago
c++ - What is the difference between load/store relaxed atomic and ...
Sep 9, 2020 · 11 The difference is that a normal load/store is not guaranteed to be tear-free, whereas a relaxed atomic read/write is. Also, the atomic guarantees that the compiler doesn't rearrange or …
Is there a difference between the _Atomic type qualifier and type ...
Oct 20, 2014 · Why the standard make that difference? It seems as both designate, in the same way, an atomic type.
C++ atomic variables cannot be assigned to each other: why? is it ...
For example, some_atomic++ is an atomic increment (which returns the original value), while some_int++ is just an integer increment with no visibility or atomicity guarantees. If you do something …
When should std::atomic_compare_exchange_strong be used?
Jul 29, 2013 · There are two atomic CAS operations in C++11: atomic_compare_exchange_weak and atomic_compare_exchange_strong. According to cppreference: The weak forms of the functions are …
c++ - the gist behind atomic shared pointer - Stack Overflow
Jan 23, 2025 · At least atomic<shared_ptr<T>> gives you per-object locking, instead of a single lock for the whole stack. So multiple threads can be waiting for different locks if multiple pops start in parallel.
When do I really need to use atomic<bool> instead of bool?
May 1, 2013 · 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 …