3 * ${class}${atomicname}() - atomic increment unless zero with ${desc_order} ordering
4 * @v: pointer to ${atomic}_t
6 * If (@v != 0), atomically updates @v to (@v + 1) with ${desc_order} ordering.
7 * Otherwise, @v is not modified and relaxed ordering is provided.
11 * Return: @true if @v was updated, @false otherwise.