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

struct targ {
  int a,b,c;
};

void *fun(void *arg) {
  targ *a = (targ *)arg;
  a->c = a->a + a->b;
  return NULL;
}

int main() {
  pthread_t thr;
  targ t = {4,7,0};
  int code = pthread_create(&thr, NULL, fun, &t);
  printf("t.c=%d\n", t.c);
  pthread_join(thr, NULL);
  printf("%d+%d=%d\n", t.a, t.b, t.c);
}