Fix unbounded memory growth for Ruby <2.7. #8429
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haberman
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fowles
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Mar 25, 2021
We now hold the mutex for both map insertions, to protect against a concurrent GC that removes from the seconary map before we can insert into the weak map.
fowles
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Mar 29, 2021
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Previously our secondary map (needed only on Ruby <2.7) was growing without bound.
This PR adds a periodic GC pass of the secondary map to avoid this unbounded memory growth.
Fixes: #8421