example usage of pthread_setcanceltype

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

int opt_a;

void *
worker(void *ptr)
{

	if (opt_a)
		pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS,NULL);

	while (1);

	return (void *) 0;
}

// main -- main program
int
main(int argc,char **argv)
{
	char *cp;
	pthread_t thr;
	void *rtn;

	--argc;
	++argv;

	for (;  argc > 0;  --argc, ++argv) {
		cp = *argv;
		if (*cp != '-')
			break;

		switch (cp[1]) {
		case 'a':
			opt_a = ! opt_a;
			break;

		default:
			break;
		}
	}

	pthread_create(&thr,NULL,worker,NULL);
	sleep(2);
	pthread_cancel(thr);
	pthread_join(thr,&rtn);

	return 0;
}