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diff --git a/src/mutex.hpp b/src/mutex.hpp
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+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_MUTEX_HPP_INCLUDED__
+#define __ZMQ_MUTEX_HPP_INCLUDED__
+
+#include "platform.hpp"
+#include "err.hpp"
+
+//  Mutex class encapsulates OS mutex in a platform-independent way.
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+#include "windows.hpp"
+
+namespace zmq
+{
+
+    class mutex_t
+    {
+    public:
+        inline mutex_t ()
+        {
+            InitializeCriticalSection (&cs);
+        }
+
+        inline ~mutex_t ()
+        {
+            DeleteCriticalSection (&cs);
+        }
+
+        inline void lock ()
+        {
+            EnterCriticalSection (&cs);
+        }
+
+        inline void unlock ()
+        {
+            LeaveCriticalSection (&cs);
+        }
+
+    private:
+
+        CRITICAL_SECTION cs;
+
+        //  Disable copy construction and assignment.
+        mutex_t (const mutex_t&);
+        void operator = (const mutex_t&);
+    };
+
+}
+
+#else
+
+#include <pthread.h>
+
+namespace zmq
+{
+ 
+    class mutex_t
+    {
+    public:
+        inline mutex_t ()
+        {
+            int rc = pthread_mutex_init (&mutex, NULL);
+            if (rc)
+                posix_assert (rc);
+        }
+ 
+        inline ~mutex_t ()
+        {
+            int rc = pthread_mutex_destroy (&mutex);
+            if (rc)
+                posix_assert (rc);
+        }
+ 
+        inline void lock ()
+        {
+            int rc = pthread_mutex_lock (&mutex);
+            if (rc)
+                posix_assert (rc);
+        }
+ 
+        inline void unlock ()
+        {
+            int rc = pthread_mutex_unlock (&mutex);
+            if (rc)
+                posix_assert (rc);
+        }
+ 
+    private:
+ 
+        pthread_mutex_t mutex;
+ 
+        // Disable copy construction and assignment.
+        mutex_t (const mutex_t&);
+        void operator = (const mutex_t&);
+    };
+ 
+}
+
+#endif
+
+#endif