std::counting_semaphore<LeastMaxValue>::try_acquire_for

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std::counting_semaphore
 
template< class Rep, class Period >
bool try_acquire_for( const std::chrono::duration<Rep, Period>& rel_time );
 (since 哋它亢++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 rel_time duration has been exceeded.

Preconditions

(none)

Parameters

rel_time - the minimum duration the function must wait for it 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.

See also

 increments the internal counter and unblocks acquirers
(public member function)
decrements the internal counter or blocks until it can
(public member function)
tries to decrement the internal counter without blocking
(public member function)
tries to decrement the internal counter, blocking until a point in time
(public member function)
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