gh-134745: Change threading.Lock implementation to PyMutex

vstinner · vstinner · commit 0e1fadaffa1d · 2025-05-26T21:07:02.000+02:00
PyMutex is a fast and portable lock currently only used internally by
Python. This change modify _thread.allocate_lock() and threading.Lock
to reuse PyMutex.
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
@@ -729,7 +729,7 @@ def test_thread_info(self):
         info = sys.thread_info
         self.assertEqual(len(info), 3)
         self.assertIn(info.name, ('nt', 'pthread', 'pthread-stubs', 'solaris', None))
-        self.assertIn(info.lock, ('semaphore', 'mutex+cond', None))
+        self.assertIn(info.lock, ('pymutex', None))
         if sys.platform.startswith(("linux", "android", "freebsd")):
             self.assertEqual(info.name, "pthread")
         elif sys.platform == "win32":
diff --git a/Python/thread.c b/Python/thread.c
@@ -261,11 +261,7 @@ PyThread_GetInfo(void)
 #ifdef HAVE_PTHREAD_STUBS
     value = Py_NewRef(Py_None);
 #elif defined(_POSIX_THREADS)
-#ifdef USE_SEMAPHORES
-    value = PyUnicode_FromString("semaphore");
-#else
-    value = PyUnicode_FromString("mutex+cond");
-#endif
+    value = PyUnicode_FromString("pymutex");
     if (value == NULL) {
         Py_DECREF(threadinfo);
         return NULL;
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
