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multithreadingexceptionc++11
Matthieu M.
Matthieu M.

Reputation: 299740

Exception propagation across threads?

In relation with This question.

C++11 adds the ability to marshall an exception to a different threads (using std::exception_ptr) and resumes its propagation.

I was wondering if such a propagation was automatic, that is: if I fail to handle an exception in a thread, is it automatically propagated in the parent thread ?

I somewhat doubt it (or it would have to wait explicitly for the join in some way), but I am not savvy on C++11 yet. Notably, I think that in the case of a std::future, it could store the exception automatically.

Upvotes: 8

Views: 402

Answers (1)

Howard Hinnant
Howard Hinnant

Reputation: 218700

Propagation is not automatic with thread. If a thread throws, and that exception is not caught, the program terminates no matter what.

future and shared_future will store an uncaught exception in the child thread. That exception is then automatically propagated when get is called.

Upvotes: 9

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