testf
pthread_create(&t, 0, testf, 0);
testf(NULL);
pthread_create(&t, 0, testf, 0);
testf(NULL);
pthread_create(&t, 0, testf, 0);
pthread_create(&t, 0, testf, 0);
testf(NULL);
pthread_create(&t, 0, testf, 0);
pthread_create(&t, 0, testf, 0);