What does "atomic" mean in programming?
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
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Atomic Photovoltaic Panel
When should std::atomic_compare_exchange_strong be used?
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
Which variable types/sizes are atomic on STM32 microcontrollers?
So, this means that Richard Barry is saying that 4-byte reads and writes are atomic on these 32-bit microcontrollers. This means that he, at least, is 100% sure 4-byte reads and writes are atomic on
What does std::atomic::is_always_lock_free = true really mean?
If for some type T the library has been able to specialize std::atomic<T> with such an implementation, then that is what we mean by saying it is lock free. (It is just confusing on x86
How to guarantee 64-bit writes are atomic?
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
Bytewise atomic memcpy and sequence locks in C++23
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
Which types on a 64-bit computer are naturally atomic in gnu C and
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
Understanding std::atomic::compare_exchange_weak() in C++11
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