inline constexpr size_t hardware_destructive_interference_size = implementation-defined;
This number is the minimum recommended offset between two concurrently-accessed objects to avoid additional performance degradation due to contention introduced by the implementation. It shall be at least alignof(max_align_t).
struct keep_apart {
alignas(hardware_destructive_interference_size) atomic<int> cat;
alignas(hardware_destructive_interference_size) atomic<int> dog;
};
— end example ]
inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
This number is the maximum recommended size of contiguous memory occupied by two objects accessed with temporal locality by concurrent threads. It shall be at least alignof(max_align_t).
struct together {
atomic<int> dog;
int puppy;
};
struct kennel {
alignas(sizeof(together)) together pack;
};
static_assert(sizeof(together) <= hardware_constructive_interference_size);
— end example ]
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