#include <pthread.h>
#include <stdio.h>
#include <sys/select.h>

pthread_mutex_t m;

void *
thr_routine(void *arg)
{
	while (1) {
		pthread_mutex_lock(&m);
		pthread_yield();
		pthread_mutex_unlock(&m);
	}
	return (0);
}

int main()
{
	pthread_t td;
	pthread_attr_t attr;
	int i;
	
	pthread_mutex_init(&m, NULL);
	pthread_attr_init(&attr);
	pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
	i = 0;
	while (i++ < 100)
		pthread_create(&td, &attr, thr_routine, 0);
	select(0, 0, 0, 0, 0);
	return (0);
}