Deadlock: Don't read from the timer channel if it already expired #734
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…to read the channel again.
This was referenced Aug 23, 2016
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Sorry for my earlier sloppy PR, I didn't catch this error until it was running in prod for some time.
In the old code, if the timer does indeed timeout, we read the value off the channel, restart the loop, and end up trying to read the value off the channel again, which causes a deadlock.
This PR adds a flag to ensure we don't do that.