template<class Rep, class Period>
cv_status wait_for(unique_lock<mutex>& lock,
const chrono::duration<Rep, Period>& rel_time);
-23- Preconditions: lock.owns_lock() is true and lock.mutex() is locked by the calling thread, and either [...]
-24- Effects: Equivalent to:
return wait_until(lock, chrono::steady_clock::now() + rel_time rel-to-abs(rel_time));
[...]
template<class Rep, class Period, class Predicate>
cv_status wait_for(unique_lock<mutex>& lock,
const chrono::duration<Rep, Period>& rel_time,
Predicate pred);
-35- Preconditions: lock.owns_lock() is true and lock.mutex() is locked by the calling thread, and either [...]
-36- Effects: Equivalent to:
return wait_until(lock, chrono::steady_clock::now() + rel_time rel-to-abs(rel_time), std::move(pred));
[Note 8: There is no blocking if pred() is initially true, even if the timeout has already expired. — end note]
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