diff --git a/third_party/2.7/tornado/locks.pyi b/third_party/2.7/tornado/locks.pyi
new file mode 100644
index 000000000..3ad107cdc
--- /dev/null
+++ b/third_party/2.7/tornado/locks.pyi
@@ -0,0 +1,50 @@
+# Stubs for tornado.locks (Python 2)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from typing import Any
+
+class _TimeoutGarbageCollector:
+    def __init__(self): ...
+
+class Condition(_TimeoutGarbageCollector):
+    io_loop = ... # type: Any
+    def __init__(self): ...
+    def wait(self, timeout=None): ...
+    def notify(self, n=1): ...
+    def notify_all(self): ...
+
+class Event:
+    def __init__(self): ...
+    def is_set(self): ...
+    def set(self): ...
+    def clear(self): ...
+    def wait(self, timeout=None): ...
+
+class _ReleasingContextManager:
+    def __init__(self, obj): ...
+    def __enter__(self): ...
+    def __exit__(self, exc_type, exc_val, exc_tb): ...
+
+class Semaphore(_TimeoutGarbageCollector):
+    def __init__(self, value=1): ...
+    def release(self): ...
+    def acquire(self, timeout=None): ...
+    def __enter__(self): ...
+    __exit__ = ... # type: Any
+    def __aenter__(self): ...
+    def __aexit__(self, typ, value, tb): ...
+
+class BoundedSemaphore(Semaphore):
+    def __init__(self, value=1): ...
+    def release(self): ...
+
+class Lock:
+    def __init__(self): ...
+    def acquire(self, timeout=None): ...
+    def release(self): ...
+    def __enter__(self): ...
+    __exit__ = ... # type: Any
+    def __aenter__(self): ...
+    def __aexit__(self, typ, value, tb): ...
+