/* cancellazione differita dei thread */
#include <stdio.h>
#include <pthread.h>

int i;
void *thread(void *arg)
{
  	i = 0;
  	if (arg)  pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
  	for (; i<50000000; i++); 
 	pthread_testcancel(); 
	printf("NON terminato!!!\n");   
	return NULL;
}
int main()
{
  	pthread_t mythread;   	pthread_attr_t myattr;   	int err;

  	pthread_attr_init(&myattr);  
	err = pthread_create(&mythread, &myattr, thread, NULL);   pthread_attr_destroy(&myattr);   
	pthread_join(mythread, NULL);
  	printf("Non cancellato: i=%d\n",i);

  	pthread_attr_init(&myattr);   
	err = pthread_create(&mythread, &myattr, thread, NULL);   pthread_attr_destroy(&myattr);   	        pthread_cancel(mythread);  	
	pthread_join(mythread, NULL);
  	printf("Cancellazione differita: i=%d\n",i);

  	pthread_attr_init(&myattr);   
	err = pthread_create(&mythread, &myattr, thread, (void *)1);   pthread_attr_destroy(&myattr);        pthread_cancel(mythread);   
	pthread_join(mythread, NULL);
  	printf("Cancellazione asincrona: i=%d\n",i);

  	return 0;
}