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

| bool try_acquire() noexcept; | | (since C++20) | | ----------------------------- | | ------------- |

Tries to atomically decrement the internal counter by 1 if it is greater than ​0​; no blocking occurs regardless.

[edit] Return value

true if it decremented the internal counter, otherwise false.

[edit] Notes

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.

[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, blocking for up to a duration time (public member function) [edit] | | | tries to decrement the internal counter, blocking until a point in time (public member function) [edit] |