set SO_EXCLUSIVEADDRUSER on Windows instead of SO_REUSEADDR

closes #550

diff --git a/tornado/netutil.py b/tornado/netutil.py
index d06a176b41c44de31232566054c7b3a415d310e2..80918e7976a6546d15f8803ca33903786a8fe194 100644 (file)
--- a/tornado/netutil.py
+++ b/tornado/netutil.py
@@ -252,7 +252,10 @@ def bind_sockets(port, address=None, family=socket.AF_UNSPEC, backlog=128):
         af, socktype, proto, canonname, sockaddr = res
         sock = socket.socket(af, socktype, proto)
         set_close_exec(sock.fileno())
-        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        if os.name == 'nt':
+            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)
+        else:
+            sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
         if af == socket.AF_INET6:
             # On linux, ipv6 sockets accept ipv4 too by default,
             # but this makes it impossible to bind to both