Looks really interesting. I assume this suggests that ClickHouse is going to gradually switch to using this library for network and I/O, thus addressing the main weakness (in my mind) of C++ thread-per-connection servers, which is, they (surprisingly!) create too many threads and can't really handle more than, say, a thousand active connections at the same time. It mostly matters for async INSERTs in this case of course, not for SELECTs, although generally it applies to both.

Seems not exception safe when task switching during unwind.

Is this comparable to Sea star [0]?

[0] https://github.com/scylladb/seastar

Play on Cilk?

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