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by conradev 3104 days ago
libevent2 (which tokio is very similar to) has the same constraint:

> Currently, only one thread can be dispatching a given event_base at a time. If you want to run events in multiple threads at once, you can either have a single event_base whose events add work to a work queue, or you can create multiple event_base objects.

http://www.wangafu.net/~nickm/libevent-2.1/doxygen/html/