33 Concurrency support library [thread]

33.3 Stop tokens [thread.stoptoken]

33.3.4 Class stop_source [stopsource]

33.3.4.3 Members [stopsource.mem]

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[[nodiscard]] stop_token get_token() const noexcept;
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Returns: stop_token() if stop_possible() is false; otherwise a new associated stop_token object.
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[[nodiscard]] bool stop_possible() const noexcept;
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Returns: true if *this has ownership of a stop state; otherwise, false.
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[[nodiscard]] bool stop_requested() const noexcept;
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Returns: true if *this has ownership of a stop state that has received a stop request; otherwise, false.
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bool request_stop() noexcept;
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Effects: If *this does not have ownership of a stop state, returns false.
Otherwise, atomically determines whether the owned stop state has received a stop request, and if not, makes a stop request.
The determination and making of the stop request are an atomic read-modify-write operation ([intro.races]).
If the request was made, the callbacks registered by associated stop_callback objects are synchronously called.
If an invocation of a callback exits via an exception then terminate is invoked ([except.terminate]).
[Note 1: 
A stop request includes notifying all condition variables of type condition_variable_any temporarily registered during an interruptible wait ([thread.condvarany.intwait]).
— end note]
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Postconditions: stop_possible() is false or stop_requested() is true.
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Returns: true if this call made a stop request; otherwise false.