#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <stdint.h>
#include <assert.h>
#include "helpers.h"
#include "helpers.c"

int x = 2, y = 3;

sigset_t quitset;

int swap(int *x, int *y)
{
	sigemptyset(&quitset);
	sigaddset(&quitset, SIGQUIT);
	sigprocmask(SIG_BLOCK, &quitset, NULL);

	int tmp = *x;
	*x = *y;
	*y = tmp;

	sigprocmask(SIG_UNBLOCK, &quitset, NULL);
}

void sig_handler(int signo)
{
	switch (signo)
	{
	case SIGQUIT:
		printf("x=%d y=%d\n", x, y);
		break;
	}
}

int main(int argc, char *argv[])
{
	assert(set_signal_handler(SIGQUIT, sig_handler) == 0);
	while (1)
	{
		swap(&x, &y);
	}
}