std::counting_semaphore::try_acquire_until - cppreference.com (original) (raw)

| 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.

[edit] Preconditions

Clock meets the Clock requirements.

[edit] Parameters

[edit] Return value

true if it decremented the internal counter, otherwise false.

[edit] Exceptions

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

[edit] Notes

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

[edit] See also

| | increments the internal counter and unblocks acquirers (public member function) [edit] | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | decrements the internal counter or blocks until it can (public member function) [edit] | | | tries to decrement the internal counter without blocking (public member function) [edit] | | | tries to decrement the internal counter, blocking for up to a duration time (public member function) [edit] |