std::counting_semaphore<LeastMaxValue>::try_acquire_until

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std::counting_semaphore
 
template<class Clock, class Duration>
bool try_acquire_until( const std::chrono::time_point<Clock, Duration>& abs_time );
 (since C++20)

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 abs_time time point has been passed.

The programs is ill-formed if std::chrono::is_clock_v<Clock> is false.

Preconditions

Clock meets the Clock requirements.

Parameters

abs_time - the earliest time the function must wait until in order to fail

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 abs_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.

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