Implementing 64 bit atomic counter with 32 bit atomics
This is a known pattern, called a SeqLock. https://en.wikipedia.org/wiki/Seqlock. (With the simplification that there’s only one writer so no extra support for excluding simultaneous writers is needed.) You don’t need or want the increment of the counter variable itself to use atomic RMW operations. (Unless you’re on a system that can do that cheaply with … Read more