1 files changed, 21 insertions, 0 deletions
diff --git a/lib/sqlalchemy/util/concurrency.py b/lib/sqlalchemy/util/concurrency.py
new file mode 100644
index 000000000..4c4ea20d1
--- /dev/null
+++ b/lib/sqlalchemy/util/concurrency.py
@@ -0,0 +1,21 @@
+from . import compat
+
+
+if compat.py3k:
+    import asyncio
+    from ._concurrency_py3k import await_only
+    from ._concurrency_py3k import await_fallback
+    from ._concurrency_py3k import greenlet
+    from ._concurrency_py3k import greenlet_spawn
+else:
+    asyncio = None
+    greenlet = None
+
+    def await_only(thing):
+        return thing
+
+    def await_fallback(thing):
+        return thing
+
+    def greenlet_spawn(fn, *args, **kw):
+        raise ValueError("Cannot use this function in py2.")