32 Thread support library [thread]

32.6 Condition variables [thread.condition]

32.6.5 Class condition_­variable_­any [thread.condition.condvarany]

32.6.5.3 Interruptible waits [thread.condvarany.intwait]

1
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The following wait functions will be notified when there is a stop request on the passed stop_­token.
In that case the functions return immediately, returning false if the predicate evaluates to false.
🔗
template<class Lock, class Predicate> bool wait(Lock& lock, stop_token stoken, Predicate pred);
2
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Effects: Registers for the duration of this call *this to get notified on a stop request on stoken during this call and then equivalent to: while (!stoken.stop_requested()) { if (pred()) return true; wait(lock); } return pred();
3
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[Note 1:
The returned value indicates whether the predicate evaluated to true regardless of whether there was a stop request.
— end note]
4
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Postconditions: lock is locked by the calling thread.
5
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Throws: Any exception thrown by pred.
6
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Remarks: If the function fails to meet the postcondition, terminate is called ([except.terminate]).
[Note 2:
This can happen if the re-locking of the mutex throws an exception.
— end note]
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template<class Lock, class Clock, class Duration, class Predicate> bool wait_until(Lock& lock, stop_token stoken, const chrono::time_point<Clock, Duration>& abs_time, Predicate pred);
7
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Effects: Registers for the duration of this call *this to get notified on a stop request on stoken during this call and then equivalent to: while (!stoken.stop_requested()) { if (pred()) return true; if (wait_until(lock, abs_time) == cv_status::timeout) return pred(); } return pred();
8
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[Note 3:
There is no blocking if pred() is initially true, stoken.stop_­requested() was already true or the timeout has already expired.
— end note]
9
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[Note 4:
The returned value indicates whether the predicate evaluated to true regardless of whether the timeout was triggered or a stop request was made.
— end note]
10
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Postconditions: lock is locked by the calling thread.
11
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Throws: Timeout-related exceptions ([thread.req.timing]), or any exception thrown by pred.
12
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Remarks: If the function fails to meet the postcondition, terminate is called ([except.terminate]).
[Note 5:
This can happen if the re-locking of the mutex throws an exception.
— end note]
🔗
template<class Lock, class Rep, class Period, class Predicate> bool wait_for(Lock& lock, stop_token stoken, const chrono::duration<Rep, Period>& rel_time, Predicate pred);
13
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Effects: Equivalent to: return wait_until(lock, std::move(stoken), chrono::steady_clock::now() + rel_time, std::move(pred));