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diff --git a/ext/systemc/src/sysc/communication/sc_host_mutex.h b/ext/systemc/src/sysc/communication/sc_host_mutex.h
new file mode 100644
index 000000000..58f1c4c3a
--- /dev/null
+++ b/ext/systemc/src/sysc/communication/sc_host_mutex.h
@@ -0,0 +1,160 @@
+/*****************************************************************************
+
+  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
+  more contributor license agreements.  See the NOTICE file distributed
+  with this work for additional information regarding copyright ownership.
+  Accellera licenses this file to you under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with the
+  License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+  implied.  See the License for the specific language governing
+  permissions and limitations under the License.
+
+ *****************************************************************************/
+
+/*****************************************************************************
+
+  sc_host_mutex.h -- A "real" mutex for the underlying host system
+
+  Original Author: Philipp A. Hartmann, OFFIS
+
+ CHANGE LOG AT THE END OF THE FILE
+ *****************************************************************************/
+
+#ifndef SC_HOST_MUTEX_H_INCLUDED_
+#define SC_HOST_MUTEX_H_INCLUDED_
+
+#ifndef SC_INCLUDE_WINDOWS_H
+#  define SC_INCLUDE_WINDOWS_H // include Windows.h, if needed
+#endif
+#include "sysc/kernel/sc_cmnhdr.h"
+#include "sysc/communication/sc_mutex_if.h"
+
+#if defined(WIN32) || defined(_WIN32)
+
+#define SC_MTX_TYPE_ CRITICAL_SECTION
+
+#define SC_MTX_INIT_( Mutex ) \
+    InitializeCriticalSection( &(Mutex) )
+#define SC_MTX_LOCK_( Mutex ) \
+    EnterCriticalSection( &(Mutex) )
+#define SC_MTX_UNLOCK_( Mutex ) \
+    LeaveCriticalSection( &(Mutex) )
+#define SC_MTX_TRYLOCK_( Mutex ) \
+    ( TryEnterCriticalSection( &(Mutex) ) != 0 )
+#define SC_MTX_DESTROY_( Mutex ) \
+    DeleteCriticalSection( &(Mutex) )
+
+#else // use pthread mutex
+
+#include <pthread.h>
+#define SC_MTX_TYPE_ pthread_mutex_t
+
+#if defined(__hpux)
+#  define SC_PTHREAD_NULL_ cma_c_null
+#else // !defined(__hpux)
+#  define SC_PTHREAD_NULL_ NULL
+#endif
+
+#define SC_MTX_INIT_( Mutex ) \
+    pthread_mutex_init( &(Mutex), SC_PTHREAD_NULL_ )
+#define SC_MTX_LOCK_( Mutex ) \
+    pthread_mutex_lock( &(Mutex) )
+#define SC_MTX_UNLOCK_( Mutex ) \
+    pthread_mutex_unlock( &(Mutex) )
+
+#ifdef _XOPEN_SOURCE
+#   define SC_MTX_TRYLOCK_( Mutex ) \
+       ( pthread_mutex_trylock( &(Mutex) ) == 0 )
+#else // no try_lock available
+#   define SC_MTX_TRYLOCK_( Mutex ) \
+       ( false ) 
+#endif
+
+#define SC_MTX_DESTROY_( Mutex ) \
+    pthread_mutex_destroy( &(Mutex) )
+
+#endif
+
+namespace sc_core {
+
+// ----------------------------------------------------------------------------
+//  CLASS : sc_host_mutex
+//
+//   The sc_host_mutex class, wrapping an OS mutex on the simulation host
+// ----------------------------------------------------------------------------
+
+class sc_host_mutex : public sc_mutex_if
+{
+    typedef SC_MTX_TYPE_ underlying_type;
+public:
+
+    // constructors and destructor
+
+    sc_host_mutex()
+	{ SC_MTX_INIT_(m_mtx); }
+    virtual ~sc_host_mutex()
+	{ SC_MTX_DESTROY_(m_mtx); }
+
+
+    // interface methods
+
+    // blocks until mutex could be locked
+    virtual int lock()
+	{ SC_MTX_LOCK_(m_mtx); return 0; }
+
+    // returns -1 if mutex could not be locked
+    virtual int trylock()
+	{ return SC_MTX_TRYLOCK_(m_mtx) ? 0 : -1; }
+
+    // should return -1 if mutex was not locked by caller,
+    // but is not yet able to check this
+    virtual int unlock()
+	{ SC_MTX_UNLOCK_(m_mtx); return 0; }
+
+private:
+    underlying_type m_mtx;
+};
+
+} // namespace sc_core
+
+#undef SC_MTX_TYPE_
+#undef SC_MTX_INIT_
+#undef SC_MTX_DESTROY_
+#undef SC_MTX_LOCK_
+#undef SC_MTX_TRYLOCK_
+#undef SC_MTX_UNLOCK_
+#undef SC_PTHREAD_NULL_
+
+/*****************************************************************************
+
+  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
+  changes you are making here.
+
+      Name, Affiliation, Date:
+  Description of Modification:
+ *****************************************************************************/
+//$Log: sc_host_mutex.h,v $
+//Revision 1.4  2011/08/30 21:53:23  acg
+// Jerome Cornet: include window.h for gnu c in windows case.
+//
+//Revision 1.3  2011/08/07 19:08:01  acg
+// Andy Goodrich: moved logs to end of file so line number synching works
+// better between versions.
+//
+//Revision 1.2  2011/06/25 17:08:38  acg
+// Andy Goodrich: Jerome Cornet's changes to use libtool to build the
+// library.
+//
+//Revision 1.1  2011/04/18 19:04:11  acg
+// Philipp A. Hartmann: first check in of file.
+//
+
+#endif
+
+// Taf!