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Add hashmap-vs-concurrenthashmap module: JDK 25 sizeCtl/treeify internals, forced and measured lost updates

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b7rnC7jppGGdHGESvy
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asmhatre
2026-10-28 18:07:37 +00:00
co-authored by Claude Sonnet 5.5
parent 715036b640
commit f80e1079a8
24 changed files with 958 additions and 0 deletions
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hashmap-vs-concurrenthashmap/output/06-recursive-update.txt
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computeIfAbsent called from inside its own mapping function (single thread)
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HashMap, inner key in a different bin: threw java.util.ConcurrentModificationException
ConcurrentHashMap, inner key in a different bin: no exception, size=2
ConcurrentHashMap, inner key, same bin (bin was empty): threw java.lang.IllegalStateException: Recursive update
ConcurrentHashMap, inner key, same bin (bin had a node): threw java.lang.IllegalStateException: Recursive update