The page you linked to [0] says: > The C++ standard recommends (but does not require) that lock-free atomic operations are also address-free, that is, suitable

The page you linked to [0] says: > The C++ standard recommends (but does not require) that lock-free atomic operations are also address-free, that is, suitable for communication between processes using shared memory. So you must check your compiler's documentation before using lock-free atomics in shared memory across a process barrier.