#include <thread.h> int cond_timedwait(cond_t *cv, mutex_t *mp, timestruct_t abstime);
cond_timedwait() always returns with the mutex locked and owned by the calling thread, even when returning an error.
The cond_timedwait() function blocks until the condition is signaled or until the time of day specified by the last argument has passed. The timeout is specified as the time of day so the condition can be retested efficiently without recomputing the time-out value.
cv points to an illegal address.
The time specified by abstime has expired.
abstime is invalid.