helloworld

HELLOWORLD

int main(int argc, char **argv) {
	ret = rte_eal_init(argc, argv);
	if (ret < 0)
		rte_panic("Cannot init EAL\n");

initialize the Environment Abstraction Layer (EAL)
initialize the number of pthreads and map the memory based on the huge pages

	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
		rte_eal_remote_launch(lcore_hello, NULL, lcore_id);
	}

plug pthread function for slave cores
arg1: function to be called
arg2: argument for the function
arg3: lcores

	lcore_hello(NULL);
	rte_eal_mp_wait_lcore();
	return 0;
}

the lcore_hello function has the rte_lcore_id which will get the id
in this case all the lcores are invoked so the master core is the final one to be invoked

static int
lcore_hello(__attribute__((unused)) void *arg)
{
	unsigned lcore_id;
	lcore_id = rte_lcore_id();
	printf("hello from core %u\n", lcore_id);
	return 0;
}

thread function of each cores
the slave cores are running due to the pthread function the master is invoked because the default is run by master core thread

EAL: Detected 8 lcore(s)          
EAL: Probing VFIO support...      
===****Initial memory for socket 0
===****Initial memory for socket 0
===****Initial memory for socket 0

default is master core 0
hello from slave core 1                 
hello from slave core 2                 
hello from slave core 3                 
hello from slave core 4                 
hello from slave core 5                 
hello from slave core 6                 
hello from slave core 7                 
hello from master core 0                

the master core id is always zero and initiated at the very last