From 89ac665891dec1988bedec2ce9b2c4d016502a49 Mon Sep 17 00:00:00 2001
From: Eric Snow <ericsnowcurrently@gmail.com>
Date: Wed, 15 Feb 2023 18:16:00 -0700
Subject: gh-98627: Add an Optional Check for Extension Module Subinterpreter
 Compatibility (gh-99040)

Enforcing (optionally) the restriction set by PEP 489 makes sense. Furthermore, this sets the stage for a potential restriction related to a per-interpreter GIL.

This change includes the following:

* add tests for extension module subinterpreter compatibility
* add _PyInterpreterConfig.check_multi_interp_extensions
* add Py_RTFLAGS_MULTI_INTERP_EXTENSIONS
* add _PyImport_CheckSubinterpIncompatibleExtensionAllowed()
* fail iff the module does not implement multi-phase init and the current interpreter is configured to check

https://github.com/python/cpython/issues/98627
---
 Python/pylifecycle.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'Python/pylifecycle.c')

diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 281035dafa9..e80dd30c89d 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -565,6 +565,10 @@ init_interp_settings(PyInterpreterState *interp, const _PyInterpreterConfig *con
     if (config->allow_daemon_threads) {
         interp->feature_flags |= Py_RTFLAGS_DAEMON_THREADS;
     }
+
+    if (config->check_multi_interp_extensions) {
+        interp->feature_flags |= Py_RTFLAGS_MULTI_INTERP_EXTENSIONS;
+    }
 }
 
 
-- 
cgit v1.2.3