Attempts to obtain ownership of the mutex without blocking.
template<class Clock, class Duration>
bool try_lock_for(const chrono::time_point<Clock, Duration>& Abs_time);
bool try_lock_until(const xtime *Abs_time);
A point in time that specifies the threshold after which the method no longer attempts to obtain ownership of the mutex.
if the method successfully obtains ownership of the mutex; otherwise, false.
If the calling thread already owns the mutex, the behavior is undefined.
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