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. …
Which types on a 64-bit computer are naturally atomic in gnu C and …
Apr 14, 2022 · I had a 25-hr debugging marathon in < 2 days and then wrote this answer here. See also the bottom of this question for more info. and documentation on 8-bit variables having naturally …
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 …
What does "atomic" mean in programming? - Stack Overflow
May 8, 2015 · 22 Atomic vs. Non-Atomic Operations "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 …
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 …
Understanding std::atomic::compare_exchange_weak() in C++11
Aug 8, 2014 · In addition (and more importantly), note that std::atomic must support all operations for all possible data types, so even if you declare a ten million byte struct, you can use compare_exchange …
Are C/C++ fundamental types atomic? - Stack Overflow
Feb 6, 2016 · Are C/C++ fundamental types, like int, double, etc., atomic, e.g. threadsafe? Are they free from data races; that is, if one thread writes to an object of such a type while another thread reads fr...
How to guarantee 64-bit writes are atomic? - Stack Overflow
Apr 6, 2015 · When can 64-bit writes be guaranteed to be atomic, when programming in C on an Intel x86-based platform (in particular, an Intel-based Mac running MacOSX 10.4 using the Intel …
Using std::condition_variable with atomic<bool>
Mar 21, 2016 · There are several questions on SO dealing with atomic, and other that deal with std::condition_variable. But my question if my use below is correct? Three threads, one ctrl thread …
Bytewise atomic memcpy and sequence locks in C++23
Aug 23, 2024 · There is the proposal P1478R8: Byte-wise atomic memcpy, which covers my exact use case. This proposal suggests to add atomic_load_per_byte_memcpy and …