How to create thread-safe random number generator in C using rand_r()?

I was asked to not use rand() because they were not "thread safe" and to also use a different seed value each time. I found examples on GitHub using a seed value like this:

unsigned int seed = time(NULL);

That only has a precision by seconds. Since the program runs in under 1 second, I end up getting the same random number every instance.

How would I fix this algorithm so that it only uses rand_r() or any other "thread safe" methods to generate 10 random numbers?

int main()
{
    for(int i = 0; i < 10; i++){
        int random;
        unsigned int seed = time(NULL);
            random = 1 + (rand_r(&seed)% 10);
        printf("%d\n",random);
    }
 return 0;
}