fix: toward correct locking mechanism - #163
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* multiple read locks can be held across threads * only a single write lock can be held * still to do: holding a read lock does not prevent writing see #141
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This PR also adds a test that fails using the current locking mechanism but passes after the changes introduced here. The test checks that read locks are not exclusive - that a thread holding a read lock does not block another thread from reading. |
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see #141