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std::counting_semaphore::try_acquire_until(3) | C++ Standard Libary | std::counting_semaphore::try_acquire_until(3) |
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.
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.
2022.07.31 | http://cppreference.com |