pthread_condattr_setclock
int pthread_condattr_setclock(pthread_condattr_t *, clockid_t);
ATF_REQUIRE(pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC) == 0);
PTHREAD_REQUIRE(pthread_condattr_setclock(&condattr, CLOCK_REALTIME));
PTHREAD_REQUIRE(pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC));
PTHREAD_REQUIRE(pthread_condattr_setclock(&attr, clck));