NAME¶

std::counting_semaphore::try_acquire_for - std::counting_semaphore::try_acquire_for

Synopsis¶

template<class Rep, class Period>
bool try_acquire_for( const std::chrono::duration<Rep, Period>& (since C++20)
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¶

rel_time - the minimum duration the function must wait for 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 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.