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cat <<EOF
	${int} r, o = *old;
	r = raw_${atomic}_cmpxchg${order}(v, o, new);
	if (unlikely(r != o))
		*old = r;
	return likely(r == o);
EOF
孤身打馬南屏舊橋邊過 恰逢山雨來時霧濛濛