Fix Recursive Mutexes to handle ThreadID==0 (bug #779)

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@1884 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/ChangeLog

@@ -1,4 +1,6 @@
 Changes towards version 0.5:
+- Fixed Recursive Mutexes to still work even if the ThreadID is 0
+  (bug 779) - Michael
 - Permit independent selection of graphics driver and resolution in
   setup menu - Michael
 - Changed comm subtitle caching to use own context instead of

sc2/src/sc2code/libs/threads/sdl/sdlthreads.c

@@ -547,7 +547,7 @@ LockRecursiveMutex_SDL (RecursiveMutex val)
 {
 	RecM *mtx = (RecM *)val;
 	Uint32 thread_id = SDL_ThreadID();
-	if (mtx->thread_id != thread_id)
+	if (!mtx->locks || mtx->thread_id != thread_id)
 	{
 #ifdef TRACK_CONTENTION
 		if (mtx->thread_id && (mtx->syncClass & TRACK_CONTENTION_CLASSES))
@@ -567,7 +567,7 @@ UnlockRecursiveMutex_SDL (RecursiveMutex val)
 {
 	RecM *mtx = (RecM *)val;
 	Uint32 thread_id = SDL_ThreadID();
-	if (mtx->thread_id != thread_id)
+	if (!mtx->locks || mtx->thread_id != thread_id)
 	{
 #ifdef NAMED_SYNCHRO
 		fprintf (stderr, "'%s' attempted to unlock %s when it didn't hold it\n", MyThreadName (), mtx->name);