#include <semaphore.h>
#include <stdio.h>
#include <pthread.h>

sem_t sem;

void *
thr_routine(void *arg)
{
	sem_wait(&sem);
	return (0);
}

int main()
{
	pthread_t td;

	if (sem_init(&sem, 1, 0) != 0) {
		perror("sem_init");
		return (0);
	}
	pthread_create(&td, NULL, thr_routine, 0);
	sleep(2);
	printf("cancelling...\n");
	pthread_cancel(td);
	pthread_join(td, NULL);

	return (0);
}