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diff --git a/src/core/Mutex.h b/src/core/Mutex.h
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+/*
+Copyright (c) 2003-2010 Sony Pictures Imageworks Inc., et al.
+All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+* Neither the name of Sony Pictures Imageworks nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef INCLUDED_OCIO_MUTEX_H
+#define INCLUDED_OCIO_MUTEX_H
+
+/* 
+PTEX SOFTWARE
+Copyright 2009 Disney Enterprises, Inc.  All rights reserved
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+
+  * The names "Disney", "Walt Disney Pictures", "Walt Disney Animation
+    Studios" or the names of its contributors may NOT be used to
+    endorse or promote products derived from this software without
+    specific prior written permission from Walt Disney Pictures.
+
+Disclaimer: THIS SOFTWARE IS PROVIDED BY WALT DISNEY PICTURES AND
+CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE, NONINFRINGEMENT AND TITLE ARE DISCLAIMED.
+IN NO EVENT SHALL WALT DISNEY PICTURES, THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND BASED ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+*/
+
+#include "Platform.h"
+
+// #define DEBUG_THREADING
+
+/** For internal use only */
+
+OCIO_NAMESPACE_ENTER
+{
+
+#ifndef NDEBUG
+    template <class T>
+    class DebugLock : public T {
+     public:
+	DebugLock() : _locked(0) {}
+	void lock()   { T::lock(); _locked = 1; }
+	void unlock() { assert(_locked); _locked = 0; T::unlock(); }
+	bool locked() { return _locked != 0; }
+     private:
+	int _locked;
+    };
+#endif
+
+    /** Automatically acquire and release lock within enclosing scope. */
+    template <class T>
+    class AutoLock {
+    public:
+	AutoLock(T& m) : _m(m) { _m.lock(); }
+	~AutoLock()            { _m.unlock(); }
+    private:
+	T& _m;
+    };
+
+#ifndef NDEBUG
+    // add debug wrappers to mutex and spinlock
+    typedef DebugLock<_Mutex> Mutex;
+    typedef DebugLock<_SpinLock> SpinLock;
+#else
+    typedef _Mutex Mutex;
+    typedef _SpinLock SpinLock;
+#endif
+
+    typedef AutoLock<Mutex> AutoMutex;
+    typedef AutoLock<SpinLock> AutoSpin;
+
+}
+OCIO_NAMESPACE_EXIT
+
+#endif