AHA! Figured out this LMDB issue. (a) the built in locking didn't work across threads (b) my own pthread_mutex locking failed, but the DB was still corrupted. read the header file section about locking...no help. Then read the section on "read only" mode... and learn...
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What platform? You realize that LMDB fully serializes writes? There is in fact no write concurrency.
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The only way you could make that fail is by using a single txn from multiple threads. Which the docs clearly prohibit.
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