std::counting_semaphore<LeastMaxValue>::try_acquire_for

template<class Rep, class Period>
bool try_acquire_for( const std::chrono::duration<Rep, Period>& rel_time );

Tries to atomically decrement the internal counter by 1 if it is greater than ​0​; otherwise blocks until it is greater than ​0​ and can successfully decrement the internal counter, or the rel_time duration has been exceeded.

Preconditions

(none).

Parameters

Return value

true if it decremented the internal counter, otherwise false.

Exceptions

May throw std::system_error or a timeout-related exception.

Notes

In practice the function may take longer than rel_time to fail.

Implementations are allowed to fail to decrement the counter even if it was greater than ​0​ - i.e., they are allowed to spuriously fail and return false.