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diff --git a/source/rice_gles/src/CritSect.h b/source/rice_gles/src/CritSect.h
new file mode 100755
index 0000000..e663e86
--- /dev/null
+++ b/source/rice_gles/src/CritSect.h
@@ -0,0 +1,75 @@
+/*
+Copyright (C) 2003 Rice1964
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#if !defined(CRITSECT_H)
+#define CRITSECT_H
+
+#include <SDL.h>
+
+//*SEB*, single process, no lock needed...
+#define NOLOCK
+
+class CCritSect
+{
+public:
+    CCritSect()
+    {
+#ifndef NOLOCK
+        cs = SDL_CreateMutex();
+#endif
+        locked = 0;
+    }
+
+    ~CCritSect()
+    {
+#ifndef NOLOCK
+        SDL_DestroyMutex(cs);
+#endif
+    }
+
+    void Lock()
+    {
+#ifndef NOLOCK
+        SDL_LockMutex(cs);
+#endif
+        locked = 1;
+    }
+
+    void Unlock()
+    {
+        locked = 0;
+#ifndef NOLOCK
+        SDL_UnlockMutex(cs);
+#endif
+    }
+
+    bool IsLocked()
+    {
+        return (locked != 0);
+    }
+
+protected:
+#ifndef NOLOCK
+    SDL_mutex *cs;
+#endif
+    int locked;
+};
+
+#endif // !defined(CRITSECT_H)
+