std::counting_semaphore<LeastMaxValue>:: try_acquire_for
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Member functions | ||||
Operations | ||||
counting_semaphore::try_acquire_for
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Constants | ||||
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.
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) |
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decrements the internal counter or blocks until it can
(public member function) |
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tries to decrement the internal counter without blocking
(public member function) |
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tries to decrement the internal counter, blocking until a point in time
(public member function) |