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This adds a macro `Py_CAN_START_THREADS` that corresponds to the Python function `test.support.threading_helper.can_start_thread()`. WASI and some Emscripten builds do not have a working pthread implementation. This macro is used to guard the critical sections C API tests that require a working threads implementation.
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.