diff --git a/include/ndnboost/regex/pending/static_mutex.hpp b/include/ndnboost/regex/pending/static_mutex.hpp
new file mode 100644
index 0000000..c7d2659
--- /dev/null
+++ b/include/ndnboost/regex/pending/static_mutex.hpp
@@ -0,0 +1,179 @@
+/*
+ *
+ * Copyright (c) 2004
+ * John Maddock
+ *
+ * Use, modification and distribution are subject to the 
+ * Boost Software License, Version 1.0. (See accompanying file 
+ * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ *
+ */
+ 
+ /*
+  *   LOCATION:    see http://www.boost.org for most recent version.
+  *   FILE         static_mutex.hpp
+  *   VERSION      see <ndnboost/version.hpp>
+  *   DESCRIPTION: Declares static_mutex lock type, there are three different
+  *                implementations: POSIX pthreads, WIN32 threads, and portable,
+  *                these are described in more detail below.
+  */
+
+#ifndef NDNBOOST_REGEX_STATIC_MUTEX_HPP
+#define NDNBOOST_REGEX_STATIC_MUTEX_HPP
+
+#include <ndnboost/config.hpp>
+#include <ndnboost/regex/config.hpp> // dll import/export options.
+
+#ifdef NDNBOOST_HAS_PTHREADS
+#include <pthread.h>
+#endif
+
+#if defined(NDNBOOST_HAS_PTHREADS) && defined(PTHREAD_MUTEX_INITIALIZER)
+//
+// pthreads version:
+// simple wrap around a pthread_mutex_t initialized with
+// PTHREAD_MUTEX_INITIALIZER.
+//
+namespace ndnboost{
+
+class static_mutex;
+
+#define NDNBOOST_STATIC_MUTEX_INIT { PTHREAD_MUTEX_INITIALIZER, }
+
+class NDNBOOST_REGEX_DECL scoped_static_mutex_lock
+{
+public:
+   scoped_static_mutex_lock(static_mutex& mut, bool lk = true);
+   ~scoped_static_mutex_lock();
+   inline bool locked()const
+   {
+      return m_have_lock;
+   }
+   inline operator void const*()const
+   {
+      return locked() ? this : 0;
+   }
+   void lock();
+   void unlock();
+private:
+   static_mutex& m_mutex;
+   bool m_have_lock;
+};
+
+class static_mutex
+{
+public:
+   typedef scoped_static_mutex_lock scoped_lock;
+   pthread_mutex_t m_mutex;
+};
+
+} // namespace ndnboost
+#elif defined(NDNBOOST_HAS_WINTHREADS)
+//
+// Win32 version:
+// Use a 32-bit int as a lock, along with a test-and-set
+// implementation using InterlockedCompareExchange.
+//
+
+#include <ndnboost/cstdint.hpp>
+
+namespace ndnboost{
+
+class NDNBOOST_REGEX_DECL scoped_static_mutex_lock;
+
+class static_mutex
+{
+public:
+   typedef scoped_static_mutex_lock scoped_lock;
+   ndnboost::int32_t m_mutex;
+};
+
+#define NDNBOOST_STATIC_MUTEX_INIT { 0, }
+
+class NDNBOOST_REGEX_DECL scoped_static_mutex_lock
+{
+public:
+   scoped_static_mutex_lock(static_mutex& mut, bool lk = true);
+   ~scoped_static_mutex_lock();
+   operator void const*()const
+   {
+      return locked() ? this : 0;
+   }
+   bool locked()const
+   {
+      return m_have_lock;
+   }
+   void lock();
+   void unlock();
+private:
+   static_mutex& m_mutex;
+   bool m_have_lock;
+   scoped_static_mutex_lock(const scoped_static_mutex_lock&);
+   scoped_static_mutex_lock& operator=(const scoped_static_mutex_lock&);
+};
+
+} // namespace
+
+#else
+//
+// Portable version of a static mutex based on Boost.Thread library:
+// This has to use a single mutex shared by all instances of static_mutex
+// because ndnboost::call_once doesn't alow us to pass instance information
+// down to the initialisation proceedure.  In fact the initialisation routine
+// may need to be called more than once - but only once per instance.
+//
+// Since this preprocessor path is almost never taken, we hide these header
+// dependencies so that build tools don't find them.
+//
+#define B1 <ndnboost/thread/once.hpp>
+#define B2 <ndnboost/thread/recursive_mutex.hpp>
+#include B1
+#include B2
+#undef B1
+#undef B2
+
+namespace ndnboost{
+
+class NDNBOOST_REGEX_DECL scoped_static_mutex_lock;
+extern "C" NDNBOOST_REGEX_DECL void ndnboost_regex_free_static_mutex();
+
+class NDNBOOST_REGEX_DECL static_mutex
+{
+public:
+   typedef scoped_static_mutex_lock scoped_lock;
+   static void init();
+   static ndnboost::recursive_mutex* m_pmutex;
+   static ndnboost::once_flag m_once;
+};
+
+#define NDNBOOST_STATIC_MUTEX_INIT {  }
+
+class NDNBOOST_REGEX_DECL scoped_static_mutex_lock
+{
+public:
+   scoped_static_mutex_lock(static_mutex& mut, bool lk = true);
+   ~scoped_static_mutex_lock();
+   operator void const*()const;
+   bool locked()const;
+   void lock();
+   void unlock();
+private:
+   ndnboost::recursive_mutex::scoped_lock* m_plock;
+   bool m_have_lock;
+};
+
+inline scoped_static_mutex_lock::operator void const*()const
+{
+   return locked() ? this : 0;
+}
+
+inline bool scoped_static_mutex_lock::locked()const
+{
+   return m_have_lock;
+}
+
+} // namespace
+
+#endif
+
+#endif