Function eal_thread_loop

dpdk/lib/eal/common/eal_common_thread.c:168–230

main loop of threads */

/* main loop of threads */
__rte_noreturn uint32_t
eal_thread_loop(void *arg)
{
	unsigned int lcore_id = (uintptr_t)arg;
	char cpuset[RTE_CPU_AFFINITY_STR_LEN];
	int ret;

	__rte_thread_init(lcore_id, &lcore_config[lcore_id].cpuset);

	ret = eal_thread_dump_current_affinity(cpuset, sizeof(cpuset));
	RTE_LOG(DEBUG, EAL, "lcore %u is ready (tid=%zx;cpuset=[%s%s])\n",
		lcore_id, rte_thread_self().opaque_id, cpuset,
		ret == 0 ? "" : "...");

	rte_eal_trace_thread_lcore_ready(lcore_id, cpuset);

	/* read on our pipe to get commands */
	while (1) {
		lcore_function_t *f;
		void *fct_arg;

		eal_thread_wait_command();

		/* Set the state to 'RUNNING'. Use release order
		 * since 'state' variable is used as the guard variable.
		 */
		rte_atomic_store_explicit(&lcore_config[lcore_id].state, RUNNING,
			rte_memory_order_release);

		eal_thread_ack_command();

		/* Load 'f' with acquire order to ensure that
		 * the memory operations from the main thread
		 * are accessed only after update to 'f' is visible.
		 * Wait till the update to 'f' is visible to the worker.
		 */
		while ((f = rte_atomic_load_explicit(&lcore_config[lcore_id].f,
				rte_memory_order_acquire)) == NULL)
			rte_pause();

		rte_eal_trace_thread_lcore_running(lcore_id, f);

		/* call the function and store the return value */
		fct_arg = lcore_config[lcore_id].arg;
		ret = f(fct_arg);
		lcore_config[lcore_id].ret = ret;
		lcore_config[lcore_id].f = NULL;
		lcore_config[lcore_id].arg = NULL;

		/* Store the state with release order to ensure that
		 * the memory operations from the worker thread
		 * are completed before the state is updated.
		 * Use 'state' as the guard variable.
		 */
		rte_atomic_store_explicit(&lcore_config[lcore_id].state, WAIT,
			rte_memory_order_release);

		rte_eal_trace_thread_lcore_stopped(lcore_id);