NAME

std::counting_semaphore::try_acquire_until - std::counting_semaphore::try_acquire_until

Synopsis

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