#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>

#define N 100

volatile int n = 0;
volatile unsigned long long k = 0;

void hello(int signo) {
	if(!(n % 1000))
		printf("Hello\n");
	n++;
	k--;
}

int main(int argc, char** argv) {
	struct sigaction sa;

	sa.sa_handler = hello;
	sa.sa_flags = 0;

	sigaction(SIGALRM, &sa, 0);
	ualarm(1000, 1000);

	unsigned long long ref = 0;
	
	while(n < N) {
		ref++;
		k++;
	}

	printf("diff: %lld %d\n", ref - k, N);

	return EXIT_SUCCESS;
}