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

#define THREADS 4

/* the function called for each thread */
void* f(void* data) {
    printf("Hello from a thread!\n");
    pthread_exit(NULL);
}

int main() {
    /* an array of threads */
    pthread_t threads[THREADS];

    for (int t = 0; t < THREADS; t++) {
        pthread_create(&threads[t], NULL, f, NULL);
    }

    pthread_exit(NULL);
}