From 7aeccb9bd09c9c0075e777e86e1a44e6bcfa6afc Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Wed, 13 Jan 2010 21:34:48 +0000
Subject: (svn r18796) -Fix [FS#3521]: [SDL] possible deadlock when killing
 OpenTTD while starting it

---
 src/video/sdl_v.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/video/sdl_v.cpp b/src/video/sdl_v.cpp
index 70684a0d3..61f37a622 100644
--- a/src/video/sdl_v.cpp
+++ b/src/video/sdl_v.cpp
@@ -112,8 +112,11 @@ static void DrawSurfaceToScreen()
 
 static void DrawSurfaceToScreenThread(void *)
 {
-	/* First wait till we 'may' start */
+	/* First tell the main thread we're started */
 	_draw_mutex->BeginCritical();
+	_draw_mutex->SendSignal();
+
+	/* Now wait for the first thing to draw! */
 	_draw_mutex->WaitForSignal();
 
 	while (_draw_continue) {
@@ -516,6 +519,9 @@ void VideoDriver_SDL::MainLoop()
 			if (!_draw_threaded) {
 				_draw_mutex->EndCritical();
 				delete _draw_mutex;
+			} else {
+				/* Wait till the draw mutex has started itself. */
+				_draw_mutex->WaitForSignal();
 			}
 		}
 	}
-- 
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