pythongh-96125: Fix sys.thread_info.name on pthread platforms (python…

…GH-96126)

Automerge-Triggered-By: GH:tiran

Lib/test/test_sys.py

@@ -628,6 +628,14 @@ def test_thread_info(self):
         self.assertEqual(len(info), 3)
         self.assertIn(info.name, ('nt', 'pthread', 'pthread-stubs', 'solaris', None))
         self.assertIn(info.lock, ('semaphore', 'mutex+cond', None))
+        if sys.platform.startswith(("linux", "freebsd")):
+            self.assertEqual(info.name, "pthread")
+        elif sys.platform == "win32":
+            self.assertEqual(info.name, "nt")
+        elif sys.platform == "emscripten":
+            self.assertIn(info.name, {"pthread", "pthread-stubs"})
+        elif sys.platform == "wasi":
+            self.assertEqual(info.name, "pthread-stubs")
 
     @unittest.skipUnless(support.is_emscripten, "only available on Emscripten")
     def test_emscripten_info(self):

Misc/NEWS.d/next/Library/2022-08-19-18-21-01.gh-issue-96125.ODcF1Y.rst

@@ -0,0 +1,2 @@
+Fix incorrect condition that causes ``sys.thread_info.name`` to be wrong on
+pthread platforms.

Python/thread.c

@@ -59,7 +59,7 @@ PyThread_init_thread(void)
 #   define PYTHREAD_NAME "pthread-stubs"
 #   include "thread_pthread_stubs.h"
 #elif defined(_POSIX_THREADS)
-#   if defined(__EMSCRIPTEN__) || !defined(__EMSCRIPTEN_PTHREADS__)
+#   if defined(__EMSCRIPTEN__) && !defined(__EMSCRIPTEN_PTHREADS__)
 #     define PYTHREAD_NAME "pthread-stubs"
 #   else
 #     define PYTHREAD_NAME "pthread"