Optional Recursive Mutex in Asio Integration - #1846
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ericniebler
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Feb 14, 2026
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/ok to test 72c179e |
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@RobertLeahy did you see my comments? also, this PR needs a rebase. |
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Yes, just haven't looped back to incorporating any of the feedback. |
Reduces the size of a "frame" by removing the std::unique_lock member variable and making the "frame" itself the lock guard. This is the lock management method shown when presenting exec::asio::completion_token in the CppCon 2025 talk "std::execution in Asio Codebases: Adopting Senders Without a Rewrite."
For general purpose (i.e. potentially multithreaded) use the asynchronous operations which result when passing the exec::asio:: completion_token and ::use_sender completion tokens must use a recursive mutex internally. However if the user knows that no multithreaded use will occur this recursive mutex is pure overhead. Provided the exec::asio::thread_unsafe_completion_token and _use_sender completion tokens which do not make use of a recursive mutex for the aforementioned use case.
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Please do not squash.
Resolves #1781.