bpo-39947: Add PyInterpreterState_Get() function (GH-18979)
* Rename _PyInterpreterState_Get() to PyInterpreterState_Get() and
move it the limited C API.
* Add _PyInterpreterState_Get() alias to PyInterpreterState_Get() for
backward compatibility with Python 3.8.
diff --git a/Include/pystate.h b/Include/pystate.h
index 1cb2305..57dc9e4 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -28,6 +28,17 @@
PyAPI_FUNC(void) PyInterpreterState_Clear(PyInterpreterState *);
PyAPI_FUNC(void) PyInterpreterState_Delete(PyInterpreterState *);
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03090000
+/* New in 3.9 */
+/* Get the current interpreter state.
+
+ Issue a fatal error if there no current Python thread state or no current
+ interpreter. It cannot return NULL.
+
+ The caller must hold the GIL. */
+PyAPI_FUNC(PyInterpreterState *) PyInterpreterState_Get(void);
+#endif
+
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03080000
/* New in 3.8 */
PyAPI_FUNC(PyObject *) PyInterpreterState_GetDict(PyInterpreterState *);