From fff7bbfdb6b7c143b73b6b4b6b40e828c101110c Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 20 Nov 2019 17:34:39 +0100
Subject: bpo-38858: Add _Py_IsMainInterpreter(tstate) (GH-17293)

---
 Python/pystate.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'Python/pystate.c')

diff --git a/Python/pystate.c b/Python/pystate.c
index 2fc563bf58..0a6d035836 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -159,6 +159,12 @@ _PyRuntimeState_ReInitThreads(_PyRuntimeState *runtime)
 #define HEAD_UNLOCK(runtime) \
     PyThread_release_lock((runtime)->interpreters.mutex)
 
+int
+_Py_IsMainInterpreter(PyThreadState* tstate)
+{
+    return (tstate->interp == tstate->interp->runtime->interpreters.main);
+}
+
 /* Forward declaration */
 static void _PyGILState_NoteThreadState(
     struct _gilstate_runtime_state *gilstate, PyThreadState* tstate);
-- 
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