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e21057b999
This adds a `_PyRecursiveMutex` type based on `PyMutex` and uses that for the import lock. This fixes some data races in the free-threaded build and generally simplifies the import lock code.
Tests in this directory are compiled into the _testinternalcapi extension. The main file for the extension is Modules/_testinternalcapimodule.c, which calls `_PyTestInternalCapi_Init_*` from these functions. See Modules/_testcapi/README.txt for guideline when writing C test code.