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

#define THREADS 40

void* f(void* id) {
    printf("Thread %ld checking in!", (long) id);
    printf("\n");
    pthread_exit(NULL);
}

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

    pthread_exit(NULL);
}