Why do control thread functions return uint32_t [1], when lcore thread functions return int [2]? https://elixir.bootlin.com/dpdk/v25.03/source/lib/eal/include/rte_thread.h#L53 https://elixir.bootlin.com/dpdk/v25.03/source/lib/eal/include/rte_launch.h#L31