cnd_signal
int cnd_signal(cnd_t *);
ATF_REQUIRE_EQ(cnd_signal(&b_c), thrd_success);
ATF_TC(cnd_signal);
ATF_TC_HEAD(cnd_signal, tc)
ATF_TC_BODY(cnd_signal, tc)
ATF_TP_ADD_TC(tp, cnd_signal);
ATF_REQUIRE_EQ(cnd_signal(&b_c), thrd_success);