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.

See also¶

release increments the internal counter and unblocks acquirers
(public member function)
acquire decrements the internal counter or blocks until it can
(public member function)
try_acquire tries to decrement the internal counter without blocking
(public member function)
tries to decrement the internal counter, blocking for up to a
try_acquire_for duration time
(public member function)