refactor: rewrite RWLock implementation with TVar (closes #157) #158
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| ((readers, Writing mv), when (readers > 0) (takeMVar mv)) | ||
| atomically $ modifyTVar' ref $ \(readers, _) -> (readers, Writing) | ||
| atomically $ readTVar ref >>= \case | ||
| (0, _) -> return () |
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One minor difference here is that the writer will be woken up whenever a read lock is released, whereas before it would be woken up only when no readers are left.
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