ef0ff679d0
BC did not take a lock for `hash-clear!`. Maybe the intent was that a lock isn't needed from the perspective of `hash-clear!` when it isn't traversing the table, but failing to take a lock before modifying the table can break other operations (that do take a lock) in progress. Furthermore, some iterations that intentionally did not take a lock also did not guard against changes well enough. Various repairs here avoid crashes, and now `hash-clear!` consistently takes a lock. CS had a similar (but more subtle and more limited) instance of the problem in `hash-map` and `hash-for-each`. That problem is corrected (without adding any new lock acquisitions). The existing CS implementation of `equal-hash-code` for hash tables takes a lock more than the BC implementation. A possibly surprising result: when attempting to add a mutable hash table to itself as part of a key, the `hash-set!` can block forever on the hash table's lock, instead of doing something more random as a result of having a mutated key. The documentation now notes that possibility. Related to #3738 |
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| README.md | ||
Racket is a general-purpose programming language and an ecosystem for language-oriented programming.
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