From 78693df5b08c933d593aec86458b3ba0baecf45b Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Tue, 19 Apr 2016 17:24:00 +0200
Subject: net.server_event: Re-add write event if writebuffer is non-empty
 after write (eg due to writes from ondrain callback) (fixes #661)

---
 net/server_event.lua | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/server_event.lua b/net/server_event.lua
index d505825d..1c6f1547 100644
--- a/net/server_event.lua
+++ b/net/server_event.lua
@@ -548,6 +548,10 @@ do
 					elseif interface.eventreadtimeout then
 						return EV_WRITE, EV_TIMEOUT
 					end
+					if interface.writebuffer ~= 0 then
+						-- data possibly written from ondrain
+						return EV_WRITE, cfg.WRITE_TIMEOUT
+					end
 					interface.eventwrite = nil
 					return -1
 				elseif byte and (err == "timeout" or err == "wantwrite") then  -- want write again
-- 
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