#12098: Make multiprocessing's child processes inherit sys.flags on Windows
Initial patch by Sergey Mezentsev.
diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index d10d51b..f02041e 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -2814,8 +2814,41 @@
with self.assertRaises(ValueError):
multiprocessing.connection.Listener('/var/test.pipe')
+#
+# Issue 12098: check sys.flags of child matches that for parent
+#
+
+class TestFlags(unittest.TestCase):
+ @classmethod
+ def run_in_grandchild(cls, conn):
+ conn.send(tuple(sys.flags))
+
+ @classmethod
+ def run_in_child(cls):
+ import json
+ r, w = multiprocessing.Pipe(duplex=False)
+ p = multiprocessing.Process(target=cls.run_in_grandchild, args=(w,))
+ p.start()
+ grandchild_flags = r.recv()
+ p.join()
+ r.close()
+ w.close()
+ flags = (tuple(sys.flags), grandchild_flags)
+ print(json.dumps(flags))
+
+ def test_flags(self):
+ import json, subprocess
+ # start child process using unusual flags
+ prog = ('from test.test_multiprocessing import TestFlags; ' +
+ 'TestFlags.run_in_child()')
+ data = subprocess.check_output(
+ [sys.executable, '-E', '-S', '-O', '-c', prog])
+ child_flags, grandchild_flags = json.loads(data.decode('ascii'))
+ self.assertEqual(child_flags, grandchild_flags)
+
testcases_other = [OtherTest, TestInvalidHandle, TestInitializers,
- TestStdinBadfiledescriptor, TestWait, TestInvalidFamily]
+ TestStdinBadfiledescriptor, TestWait, TestInvalidFamily,
+ TestFlags]
#
#