pthread_cancel
int pthread_cancel(pthread_t);
RZ(pthread_cancel(t));
RZ(pthread_cancel(t));
pthread_cancel(pthread_self());
RZ(pthread_cancel(pthread_self()));
RZ(pthread_cancel(t));
RZ(pthread_cancel(t));
RZ(pthread_cancel(t));
RZ(pthread_cancel(t));
RZ(pthread_cancel(t));
RZ(pthread_cancel(t));
RZ(pthread_cancel(pthread_self())); /* cancel */
PTHREAD_REQUIRE(pthread_cancel(thread));
rv = pthread_cancel(t);
PTHREAD_REQUIRE(pthread_cancel(thread));
pthread_cancel(pt);
pthread_cancel(pt);