python
diff --git a/‎Doc/c-api/init.rst‎
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diff --git a/‎Doc/whatsnew/3.9.rst‎
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diff --git a/‎Include/pystate.h‎
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diff --git a/‎Misc/NEWS.d/next/C API/2020-03-25-19-44-55.bpo-39947.2OxvPt.rst‎
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diff --git a/‎Modules/_asynciomodule.c‎
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diff --git a/‎Python/pystate.c‎
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@@ -1084,6 +1084,15 @@ All of the following functions must be called after :c:func:`Py_Initialize`.
    .. versionadded:: 3.9
 
 
+.. c:function:: uint64_t PyThreadState_GetID(PyThreadState *tstate)
+
+   Get the unique thread state identifier of the Python thread state *tstate*.
+
+   *tstate* must not be ``NULL``.
+
+   .. versionadded:: 3.9
+
+
 .. c:function:: PyInterpreterState* PyThreadState_GetInterpreter(PyThreadState *tstate)
 
    Get the interpreter of the Python thread state *tstate*.
 
@@ -429,6 +429,8 @@ Build and C API Changes
   :c:func:`PyInterpreterState_Get` functions to get the interpreter.
   New :c:func:`PyThreadState_GetFrame` function to get the current frame of a
   Python thread state.
+  New :c:func:`PyThreadState_GetID` function: get the unique identifier of a
+  Python thread state.
   (Contributed by Victor Stinner in :issue:`39947`.)
 
 * Add ``--with-platlibdir`` option to the ``configure`` script: name of the
 
@@ -91,6 +91,7 @@ PyAPI_FUNC(int) PyThreadState_SetAsyncExc(unsigned long, PyObject *);
 /* New in 3.9 */
 PyAPI_FUNC(PyInterpreterState*) PyThreadState_GetInterpreter(PyThreadState *tstate);
 PyAPI_FUNC(struct _frame*) PyThreadState_GetFrame(PyThreadState *tstate);
+PyAPI_FUNC(uint64_t) PyThreadState_GetID(PyThreadState *tstate);
 #endif
 
 typedef
 
@@ -0,0 +1,2 @@
+Add :c:func:`PyThreadState_GetID` function: get the unique identifier of a
+Python thread state.
@@ -231,7 +231,8 @@ get_running_loop(PyObject **loop)
     PyObject *rl;
 
     PyThreadState *ts = PyThreadState_Get();
-    if (ts->id == cached_running_holder_tsid && cached_running_holder != NULL) {
+    uint64_t ts_id = PyThreadState_GetID(ts);
+    if (ts_id == cached_running_holder_tsid && cached_running_holder != NULL) {
         // Fast path, check the cache.
         rl = cached_running_holder;  // borrowed
     }
@@ -252,7 +253,7 @@ get_running_loop(PyObject **loop)
         }
 
         cached_running_holder = rl;  // borrowed
-        cached_running_holder_tsid = ts->id;
+        cached_running_holder_tsid = ts_id;
     }
 
     assert(Py_IS_TYPE(rl, &PyRunningLoopHolder_Type));
 
@@ -1012,6 +1012,14 @@ PyThreadState_GetFrame(PyThreadState *tstate)
 }
 
 
+uint64_t
+PyThreadState_GetID(PyThreadState *tstate)
+{
+    assert(tstate != NULL);
+    return tstate->id;
+}
+
+
 /* Asynchronously raise an exception in a thread.
    Requested by Just van Rossum and Alex Martelli.
    To prevent naive misuse, you must write your own extension
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Add :c:func:`PyThreadState_GetID` function: get the unique identifier of a
	`2`	`+Python thread state.`
Original file line number	Diff line number	Diff line change
`@@ -231,7 +231,8 @@ get_running_loop(PyObject **loop)`
`231`	`231`	`PyObject *rl;`
`232`	`232`
`233`	`233`	`PyThreadState *ts = PyThreadState_Get();`
`234`		`- if (ts->id == cached_running_holder_tsid && cached_running_holder != NULL) {`
	`234`	`+ uint64_t ts_id = PyThreadState_GetID(ts);`
	`235`	`+ if (ts_id == cached_running_holder_tsid && cached_running_holder != NULL) {`
`235`	`236`	`// Fast path, check the cache.`
`236`	`237`	`rl = cached_running_holder; // borrowed`
`237`	`238`	`}`
`@@ -252,7 +253,7 @@ get_running_loop(PyObject **loop)`
`252`	`253`	`}`
`253`	`254`
`254`	`255`	`cached_running_holder = rl; // borrowed`
`255`		`- cached_running_holder_tsid = ts->id;`
	`256`	`+ cached_running_holder_tsid = ts_id;`
`256`	`257`	`}`
`257`	`258`
`258`	`259`	`assert(Py_IS_TYPE(rl, &PyRunningLoopHolder_Type));`