STINNER Victor added the comment:
> but faulthandler_dump_traceback calls PyGILState_GetThisThreadState() which
> ultimately calls thread.c's find_key() which acquires a lock:
Hum, Python 3 now uses native TLS, not this fallback implementation using a
lock. At least on Linux and Windows. I don't know if the fallback
implementation is still used (which platforms supported by Python don't provide
pthread API?
PyGILState_GetThisThreadState -> PyThread_get_key_value:
* pthread: pthread_getspecific()
* Windows ("nt"): TlsGetValue()
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<http://bugs.python.org/issue30165>
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