#include <threads.h>
#include <pthread.h>
#include <errno.h>

int cnd_timedwait_base(cnd_t *restrict c, mtx_t *restrict m, int time_base, const struct timespec *restrict ts)
{
	clockid_t clock = CLOCK_REALTIME;
	switch (time_base)
	{
	case TIME_UTC:
		clock = CLOCK_REALTIME;
		break;
	case TIME_MONOTONIC:
		clock = CLOCK_MONOTONIC;
		break;
	default:
		return thrd_error;
	}
	int ret = pthread_cond_clockwait((pthread_cond_t *)c, (pthread_mutex_t *)m, clock, ts);
	switch (ret) {
	/* May also return EINVAL or EPERM. */
	default:        return thrd_error;
	case 0:         return thrd_success;
	case ETIMEDOUT: return thrd_timedout;
	}
}