r305_dm/TP4/Exo1/pi.c

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

uint64_t shots = 0,
		 shots_in = 0;

double pi = 0,
	   t1;

sigset_t alset, intset, quitset;

void alarm_handler(int)
{
	sigprocmask(SIG_BLOCK, &alset, NULL);
	printf("pi = %f\n", pi);
	printf("le nombre de tirs est de %f\n", (double)shots);
	alarm(5);
	sigprocmask(SIG_UNBLOCK, &alset, NULL);
}

void int_handler(int)
{
	alarm(0);

	sigprocmask(SIG_BLOCK, &intset, NULL);

	char c;
	printf("Voulez-vous quitter ? (y/n)\n");
	c = getchar();

	if (c == 'y' || c == 'Y')
	{
		printf("Le temps écoulé est de %f\n", tstamp() - t1);
		exit(0);
	}
	return;
	sigprocmask(SIG_UNBLOCK, &intset, NULL);
	alarm(5);
}

void quit_handler(int)
{
	alarm(0);
	sigprocmask(SIG_BLOCK, &quitset, NULL);
	shots = 0;
	shots_in = 0;
	t1 = tstamp();
	sigprocmask(SIG_UNBLOCK, &quitset, NULL);
	alarm(5);
}

int main(int argc, char *argv[])
{
	double x, y;
	t1 = tstamp();
	alarm(5);
	sigaddset(&alset, SIGINT);
	sigaddset(&alset, SIGQUIT);
	sigaddset(&intset, SIGALRM);
	sigaddset(&intset, SIGQUIT);
	sigaddset(&quitset, SIGALRM);
	sigaddset(&quitset, SIGINT);
	set_signal_handler(SIGALRM, &alarm_handler);
	set_signal_handler(SIGINT, &int_handler);
	set_signal_handler(SIGQUIT, &quit_handler);

	while (1)
	{
		x = ((double)rand()) / (double)RAND_MAX;
		y = ((double)rand()) / (double)RAND_MAX;
		shots++;

		if ((x * x + y * y) <= 1)
			shots_in++;

		pi = 4 * (double)(shots_in) / shots;
	}
}