#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#define MAXTHREADS 16

static volatile int start = 0;
static char *file = "/tmp";
static unsigned long count[MAXTHREADS][32];

void *start_routine(void *arg)
{
	const char *filename;
	struct stat st;
	unsigned long *counter = arg;

	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
	while (!start)
		/* nothing */;
	filename = file;
	for (;;) {
		stat(filename, &st);
		++*counter;
	}
}

int main(int argc, char **argv)
{
	pthread_t threads[MAXTHREADS];
	unsigned long n;
	int i;

	if (argv[1])
		file = argv[1];
	for (i = 0; i < MAXTHREADS; i++)
		pthread_create(threads+i, NULL, start_routine, count[i]);
	start = 1;
	sleep(10);
	for (i = 0; i < MAXTHREADS; i++)
		pthread_cancel(threads[i]);
	for (i = 0; i < MAXTHREADS; i++)
		pthread_join(threads[i], NULL);
	n = 0;
	for (i = 0; i < MAXTHREADS; i++)
		n += count[i][0];
	printf("Total loops: %lu\n", n);
	return 0;
}