epoll wakeup fixes #4692
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epoll wakeup fixes #4692
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This fixes a bug in the epoll wakeup logic, where if we had 2 events to deliver, and 2 threads queued that each wanted to take 1 event, we'd only wake up one of them.
Also add some sanity-check assertions that will ensure we do not wake up too many or too few threads.
And finally, fix the diagnostic printing for deadlock errors: don't try to show the stacktrace of finished treads. This is independent but would conflict so I am not making it a separate PR.