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

| template< class Rep, class Period > bool try_acquire_for( const std::chrono::duration<Rep, Period>& rel_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 rel_time duration has been exceeded.

[edit] Preconditions

(none)

[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 rel_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 until a point in time (public member function) [edit] |