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diff --git a/ETL/ETL/_mutex_pthreads.h b/ETL/ETL/_mutex_pthreads.h
new file mode 100644
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+++ b/ETL/ETL/_mutex_pthreads.h
@@ -0,0 +1,116 @@
+/*! ========================================================================
+** Extended Template and Library
+** Mutex Abstraction Class Implementation
+** $Id$
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** This package 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 package 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.
+**
+** === N O T E S ===========================================================
+**
+** This is an internal header file, included by other ETL headers.
+** You should not attempt to use it directly.
+**
+** ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __ETL__MUTEX_PTHREADS_H_
+#define __ETL__MUTEX_PTHREADS_H_
+
+/* === H E A D E R S ======================================================= */
+
+#define __USE_GNU
+
+#include <pthread.h>
+
+#ifdef HAVE_SCHED_H
+# include <sched.h>
+#endif
+
+/* === M A C R O S ========================================================= */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+_ETL_BEGIN_NAMESPACE
+
+class mutex
+{
+	pthread_mutex_t mtx;
+	pthread_t locker;
+	int depth;
+public:
+
+	mutex()
+	{
+		pthread_mutexattr_t attr;
+		pthread_mutexattr_init(&attr);
+		//#ifdef PTHREAD_PRIO_INHERIT
+		//pthread_mutexattr_setprioceiling(&attr,PTHREAD_PRIO_INHERIT);
+		//#endif
+		#ifdef PTHREAD_MUTEX_RECURSIVE
+		pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_RECURSIVE);
+		#endif
+		pthread_mutex_init(&mtx,&attr);
+		pthread_mutexattr_destroy(&attr);
+		locker=0;
+		depth=0;
+	}
+
+	~mutex()
+	{ pthread_mutex_destroy(&mtx); }
+
+
+	//! Exception-safe mutex lock class
+	class lock
+	{
+		mutex *_mtx;
+	public:
+		lock(mutex &x):_mtx(&x) { _mtx->lock_mutex(); }
+		~lock() { _mtx->unlock_mutex(); }
+		mutex &get() { return *_mtx; }
+	};
+
+	void lock_mutex(void)
+	{
+		if(!locker || locker!=pthread_self())
+		{
+			pthread_mutex_lock(&mtx);
+			locker=pthread_self();
+			depth=0;
+			return;
+		}
+		depth++;
+	}
+
+	bool try_lock_mutex(void)
+	{ return !(bool) pthread_mutex_trylock(&mtx); }
+
+	void unlock_mutex(void)
+	{
+		if(depth)
+		{
+			depth--;
+			return;
+		}
+		pthread_mutex_unlock(&mtx);
+		locker=0;
+	}
+};
+
+_ETL_END_NAMESPACE
+
+/* === E X T E R N S ======================================================= */
+
+/* === E N D =============================================================== */
+
+#endif