Fix data race with struct access after calling Stop()
#93
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We need to obtain a lock before accessing `s.active` because `Stop()` might write to it at the same time.
briandowns
approved these changes
Jul 4, 2020
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We need to obtain a lock before accessing
s.activebecauseStop()might write to it at the same time.Followup to #92, where I attempted to fix a Writer-related data race, but left code the vulnerable to race conditions around struct property access.