2 files changed, 35 insertions, 0 deletions
diff --git a/tests/patcher_test.py b/tests/patcher_test.py
index f80b589..5c9076f 100644
--- a/tests/patcher_test.py
+++ b/tests/patcher_test.py
@@ -492,5 +492,10 @@ t2.join()
         self.assertEqual(lines[1], "True", lines[1])
 
 
+def test_importlib_lock():
+    output = run_python('tests/patcher_test_importlib_lock.py')
+    assert output.rstrip() == b'ok'
+
+
 if __name__ == '__main__':
     main()
diff --git a/tests/patcher_test_importlib_lock.py b/tests/patcher_test_importlib_lock.py
new file mode 100644
index 0000000..8f7cea7
--- /dev/null
+++ b/tests/patcher_test_importlib_lock.py
@@ -0,0 +1,30 @@
+from __future__ import print_function
+
+import sys
+
+import eventlet
+
+
+# no standard tests in this file, ignore
+__test__ = False
+
+
+def do_import():
+    import encodings.idna
+
+
+if __name__ == '__main__':
+    eventlet.monkey_patch()
+    threading = eventlet.patcher.original('threading')
+
+    sys.modules.pop('encodings.idna', None)
+
+    # call "import encodings.idna" in a new thread
+    thread = threading.Thread(target=do_import)
+    thread.start()
+
+    # call "import encodings.idna" in the main thread
+    do_import()
+
+    thread.join()
+    print('ok')