#include <pthread.h>
#include <stdio.h>
#include <machine/cpufunc.h>

int stop = 1;
pthread_mutex_t m;
pthread_cond_t  c;

void *
thr_routine(void *a)
{
	pthread_mutex_lock(&m);
	if (stop)
		pthread_cond_wait(&c, &m);
	pthread_mutex_unlock(&m);
	return (0);
}

#define THREADS 1000
#define LOOPS	100

int main()
{
	uint64_t s, e;
	pthread_t td[THREADS];
	int i, loop;

	pthread_mutex_init(&m, NULL);
	pthread_cond_init(&c, NULL);

	s = rdtsc();
	for (loop = 0; loop < LOOPS; ++loop) {
		pthread_mutex_lock(&m);
		for (i = 0; i < THREADS; ++i) {
			pthread_create(&td[i], NULL, thr_routine, NULL);
		}
		stop = 0;
		pthread_cond_broadcast(&c);
		pthread_mutex_unlock(&m);
		for (i = 0; i < THREADS; ++i) {
			pthread_join(td[i], NULL);
		}
	}
	e = rdtsc();
	printf("%lld\n", e-s);
	return (0);
}