thrd_sleep
int thrd_sleep(const struct timespec *, struct timespec *);
RT(thrd_sleep(&t, NULL));
ATF_TC(thrd_sleep);
ATF_TC_HEAD(thrd_sleep, tc)
ATF_TC_BODY(thrd_sleep, tc)
ATF_REQUIRE_EQ(!thrd_sleep(&ts, NULL), 0);
ATF_REQUIRE_EQ(thrd_sleep(&ts, &rem), 0);
ATF_REQUIRE_EQ(!thrd_sleep(&ts, &rem), 0);
ATF_TP_ADD_TC(tp, thrd_sleep);