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May 8, 2015 · 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. 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.. 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. 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. Oct 20, 2014 · Why the standard make that difference? It seems as both designate, in the same way, an atomic type.

The reason num++ appears to be atomic is because on x86 machines, incrementing a 32-bit integer is, in fact, atomic (assuming no memory retrieval takes place). But this is neither guaranteed by the c++. But rename() is still atomic in a very important sense: if you use it to overwrite a file, then you will end up with either the old or the new version and nothing else. [update: but as @jonas-wielicki points out in. Jul 17, 2025 · An atomic operation is a trio of steps read, modify, and write (or, load, operate, and store) in that order and with no interruptions or re-ordering allowed in the instruction or data paths. In.