17 Language support library [support]

17.12 Coroutines [support.coroutine]

17.12.4 Class template coroutine_­handle [coroutine.handle]

17.12.4.5 Resumption [coroutine.handle.resumption]

1
#
Resuming a coroutine via resume, operator(), or destroy on an execution agent other than the one on which it was suspended has implementation-defined behavior unless each execution agent either is an instance of std​::​thread or std​::​jthread, or is the thread that executes main.
[Note 1:
A coroutine that is resumed on a different execution agent should avoid relying on consistent thread identity throughout, such as holding a mutex object across a suspend point.
— end note]
[Note 2:
A concurrent resumption of the coroutine can result in a data race.
— end note]
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void operator()() const; void resume() const;
2
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Preconditions: *this refers to a suspended coroutine.
The coroutine is not suspended at its final suspend point.
3
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Effects: Resumes the execution of the coroutine.
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void destroy() const;
4
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Preconditions: *this refers to a suspended coroutine.
5
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Effects: Destroys the coroutine ([dcl.fct.def.coroutine]).