commit fe91e9ba08a8854e2149398386702828fe3c0038
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Mon Dec 03 13:11:41 2018 -0800
committer Andrew Svetlov <andrew.svetlov@gmail.com> Mon Dec 03 23:11:41 2018 +0200
tree 759f204e6f98082c519567defa08b9ad9b060a49
parent a9f435e5d856fb62516b70a78217e40b90bec233

[3.7] bpo-35380: Enable TCP_NODELAY for proactor event loop (GH-10867) (GH-10872)

* bpo-35380: Enable TCP_NODELAY for proactor event loop (GH-10867)
(cherry picked from commit 3bc0ebab17bf5a2c29d2214743c82034f82e6573)

Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>

Lib/asyncio/base_events.py

diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index b3b0755..65e0529 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -165,6 +165,17 @@
     futures._get_loop(fut).stop()
 
 
+if hasattr(socket, 'TCP_NODELAY'):
+    def _set_nodelay(sock):
+        if (sock.family in {socket.AF_INET, socket.AF_INET6} and
+                sock.type == socket.SOCK_STREAM and
+                sock.proto == socket.IPPROTO_TCP):
+            sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+else:
+    def _set_nodelay(sock):
+        pass
+
+
 class _SendfileFallbackProtocol(protocols.Protocol):
     def __init__(self, transp):
         if not isinstance(transp, transports._FlowControlMixin):