Answer by Alex Guteniev for How do atomics larger than the CPU's native...
TL;DR: it is a userspace spinlock, a bad decision that is currently locked for some time for ABI reasons.MSVC uses a spinlock for atomic but a SRWLOCK for atomic_refSee the source: // Spinlock integer...
View ArticleAnswer by doron for How do atomics larger than the CPU's native support work
If there is no machine code primitive to perform the action without a lock, std::atomic will add the required lock to ensure things are atomic.There is a even a compile time is_always_lock_free member...
View ArticleHow do atomics larger than the CPU's native support work
With current C++ compilers you can have atomic support of atomics that are larger than the actual support of your CPU. With x64 you can have atomics that are 16 bytes, but std::atomic also works with...
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