Mateusz Mandera 2365a53496 queue: Fix a race condition in monitoring after queue stops being idle. ...

The race condition is described in the comment block removed by this
commit. This leaves room for another, remaining race condition
that should be virtually impossible, but nevertheless it seems
worthwhile to have it documented in the code, so we put a new comment
describing it.
As a final note, this is not a new race condition,
it was hypothetically possible with the old code as well.

2020-09-21 15:22:56 -07:00

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