ATOMIC_EXCHANGE  2776 gc.c               if (ATOMIC_EXCHANGE(finalizing, 1)) return;
ATOMIC_EXCHANGE  2831 gc.c               if (ATOMIC_EXCHANGE(finalizing, 1)) return;
ATOMIC_EXCHANGE   153 ruby_atomic.h  # define ATOMIC_SIZE_EXCHANGE(var, val) ATOMIC_EXCHANGE(var, val)
ATOMIC_EXCHANGE   161 ruby_atomic.h  #   define ATOMIC_PTR_EXCHANGE(var, val) ATOMIC_EXCHANGE(var, val)
ATOMIC_EXCHANGE   168 ruby_atomic.h  #   define ATOMIC_VALUE_EXCHANGE(var, val) ATOMIC_EXCHANGE(var, val)