Use SO_REUSEPORT if available (#1344)

Author: kirubakaran

gunicorn/sock.py

@@ -38,6 +38,8 @@ def __getattr__(self, name):
 
     def set_options(self, sock, bound=False):
         sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        if hasattr(socket, 'SO_REUSEPORT'):
+            sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
         if not bound:
             self.bind(sock)
         sock.setblocking(0)