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I wrote a new different API: https://github.com/python/cpython/pull/780
New C API for variables only initialized once to be able to clear
them at exit:
 New macro _Py_ONCEVAR(var) to declare a variable
 New macro _PY_ONCEVAR_INIT(var, expr) to initialize a variable
 once
 New function _PyOnceVar_Set() to explicitly set a variable once
 to initialize it
 New _PyOnceVar_Fini() function clearing all variables (initialized
 once) at exit
Variables keep their PyObject* type, but the API hides an internal C array tracking all Python objects to Py_DECREF them at exit in _PyOnceVar_Fini().
I used Nick's naming scheme since it seems like pthread has an existing API which is similar, but different (my API doesn't require an initialization callback).
I really prefer the second API using PyObject*.