ATOMIC_VALUE_EXCHANGE  200 eval.c         	VALUE err = ATOMIC_VALUE_EXCHANGE(errs[nerr], Qnil);
ATOMIC_VALUE_EXCHANGE 2767 gc.c               while ((zombie = ATOMIC_VALUE_EXCHANGE(heap_pages_deferred_final, 0)) != 0) {
ATOMIC_VALUE_EXCHANGE 8020 gc.c               VALUE s = ATOMIC_VALUE_EXCHANGE(*store, 0);
ATOMIC_VALUE_EXCHANGE  167 ruby_atomic.h  # ifndef ATOMIC_VALUE_EXCHANGE
ATOMIC_VALUE_EXCHANGE  204 ruby_atomic.h  #ifndef ATOMIC_VALUE_EXCHANGE