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

int results[2] = {0, 0};

void *thread_one(void *unused) { (void)unused;
    results[0] = 10 + 20;
    return NULL;
}

void *thread_two(void *unused) { (void)unused;
    results[1] = 30 + 40;
    return NULL;
}

int main(void) {
    pthread_t t1, t2;
    printf("main: begin\n");
    pthread_create(&t1, NULL, thread_one, NULL);
    pthread_create(&t2, NULL, thread_two, NULL);
    pthread_join(t1, NULL);
    pthread_join(t2, NULL);
    printf("result0=%d result1=%d\n", results[0], results[1]);
    printf("main: end\n");
    return 0;
}