Work with pthread in C

Example use pthread in C

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void *start_routine(void *arg)
{
    int *i = (int *)arg;
    while(*i< 10) {
        sleep(1);
        *i += 1;
        printf("i = %i\n", *i);
    }
    pthread_exit(0);
}

int main()
{
    pthread_t tid;
    int ret;
    int *result = malloc(sizeof(int));
    *result = 0;
    
    ret = pthread_create(&tid, NULL, start_routine, (void *)result);
    
    //pthread_join(tid, NULL);
    while(*result < 10) {
        sleep(1);
        printf("result = %i\n", *result);
    }
    
    return 0;
}