Improve efficiency of drb ID hash using reference queues#2104
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This implementation must periodically "clean" stale references out of the underlying Hash, which requires an O(n) search. To reduce the chance of this search happening, it only runs when inserting a new entry into the weak mapping. Stale entries that are discovered while retrieving entries are deleted individually.
This version requires the "weakling" library, for its implementation of weak reference queues. It improves on the weakref-only implementation by reducing the periodic reference scan to a queue poll, which should be a no-op when there are no queued references. In order for this implementation to work in CRuby, the weakref library would need to support reference queues, ideally backed by the CRuby GC to make them efficient.
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This PR builds on #2102, which is for https://bugs.ruby-lang.org/issues/15711.
This version requires the "weakling" library, for its
implementation of weak reference queues. It improves on the
weakref-only implementation by reducing the periodic reference
scan to a queue poll, which should be a no-op when there are no
queued references.
In order for this implementation to work in CRuby, the weakref
library would need to support reference queues, ideally backed by
the CRuby GC to make them efficient.