From 9cde77060a05ed9b0dae8dffdb7f9ed77734bbf9 Mon Sep 17 00:00:00 2001
From: Brandon Low <lostlogic@rockbox.org>
Date: Wed, 12 Apr 2006 15:38:56 +0000
Subject: [PATCH] Patch 5107 from Steve Bavin, enable locking on sdl sim, now
 mutexes actually MUT EX on the SDL sim

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9638 a1c6a512-1295-4272-9138-f99709370657
---
 docs/CREDITS             |  1 +
 uisimulator/sdl/kernel.c | 11 +++++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/docs/CREDITS b/docs/CREDITS
index 4c25a979e5..2f1d451d2d 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -197,3 +197,4 @@ Rani Hod
 Tom Ross
 Anton Romanov
 Jean-Luc Ohl
+Steve Bavin
diff --git a/uisimulator/sdl/kernel.c b/uisimulator/sdl/kernel.c
index c17dc49dd6..b9ffe0eefe 100644
--- a/uisimulator/sdl/kernel.c
+++ b/uisimulator/sdl/kernel.c
@@ -150,18 +150,21 @@ int tick_remove_task(void (*f)(void))
     return -1;
 }
 
-/* TODO: Implement mutexes for win32 */
+/* Very simple mutex simulation - won't work with pre-emptive
+   multitasking, but is better than nothing at all */
 void mutex_init(struct mutex *m)
 {
-    (void)m;
+    m->locked = false;
 }
 
 void mutex_lock(struct mutex *m)
 {
-    (void)m;
+    while(m->locked)
+        switch_thread();
+    m->locked = true;
 }
 
 void mutex_unlock(struct mutex *m)
 {
-    (void)m;
+    m->locked = false;
 }