Add support for freethreading in extension #264
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oschwald
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Implements thread-safe concurrent database operations for Python's free-threading mode using native locks where available. - Uses native RW locks (pthread_rwlock_t on POSIX, SRWLOCK on Windows) to allow multiple concurrent readers - Uses GIL on platforms that don't support these native locks - Zero overhead when GIL is enabled (macros compile to no-ops)
We already have some threading coverage in the general reader tests, but this provides more detailed implementation tests for the extension.
To ensure we are forcing correct checks in CI
The C extension was being built but not imported during tests due to Python's sys.path ordering. The project root directory was appearing first in sys.path, causing Python to import from the source directory (which doesn't have the compiled .so file) instead of the installed package in site-packages. Changes: - Add pytest --import-mode=importlib to prevent pytest from adding the project root to sys.path, ensuring tests import from the installed package in the tox virtualenv - Add MAXMINDDB_REQUIRE_EXTENSION=1 to the "Setup test suite" step to ensure the extension is built during CI setup
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Closes #249.