dec_if_positive

cat <<EOF
/**
 * ${class}${atomicname}() - atomic decrement if positive with ${desc_order} ordering
 * @v: pointer to ${atomic}_t
 *
 * If (@v > 0), atomically updates @v to (@v - 1) with ${desc_order} ordering.
 * Otherwise, @v is not modified and relaxed ordering is provided.
 *
 * ${desc_noinstr}
 *
 * Return: The old value of (@v - 1), regardless of whether @v was updated.
 */
EOF