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Tokio tasks currently complete by taking the GIL and calling `reactor.callFromThread`. Taking the GIL may block for a period of time, and we do not want that to happen on the tokio reactor threads (as that can block other work from happening). To avoid this, we instead add a work queue that we can add to from Rust without taking the GIL, which is drained by the reactor. We signal to the Twisted reactor that it should wake up by using a unix socket pair, which is exactly how `reactor.callFromThread` works. --- The self-pipe trick is basically where you create a pair of unix sockets connected to each other. One end is added to the reactor so the reactor is woken up when there are bytes to read, and when another thread needs to wake up the reactor it just needs to write a byte into the other unix socket. --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>