有没有办法在C中使函数成为原子？

#include <stdatomic.h>
#include<stdio.h>
#include<threads.h>

atomic_int counter = ATOMIC_VAR_INIT(0);

int increment(void *arg) {
    for (int i = 0; i < 100000; i++) {
        atomic_fetch_add_explicit(&counter, 1, memory_order_relaxed);
    }
    return 0;
}

int main(void) {
    thrd_t threads[2];

    thrd_create(&threads[0], increment, NULL);
    thrd_create(&threads[1], increment, NULL);

    thrd_join(threads[0], NULL);
    thrd_join(threads[1], NULL);

    printf("Counter: %d\n", atomic_load_explicit(&counter, memory_order_relaxed));

    return 0;
}