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diff --git a/boost/interprocess/sync/windows/semaphore.hpp b/boost/interprocess/sync/windows/semaphore.hpp
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+++ b/boost/interprocess/sync/windows/semaphore.hpp
@@ -0,0 +1,137 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2005-2011. Distributed under 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)
+//
+// See http://www.boost.org/libs/interprocess for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTERPROCESS_DETAIL_WINDOWS_SEMAPHORE_HPP
+#define BOOST_INTERPROCESS_DETAIL_WINDOWS_SEMAPHORE_HPP
+
+#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#  pragma once
+#endif
+
+#include <boost/interprocess/detail/config_begin.hpp>
+#include <boost/interprocess/detail/workaround.hpp>
+#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
+#include <boost/interprocess/detail/win32_api.hpp>
+#include <boost/interprocess/detail/intermodule_singleton.hpp>
+#include <boost/interprocess/sync/windows/sync_utils.hpp>
+#include <boost/interprocess/exceptions.hpp>
+
+
+namespace boost {
+namespace interprocess {
+namespace ipcdetail {
+
+class windows_semaphore
+{
+   windows_semaphore(const windows_semaphore &);
+   windows_semaphore &operator=(const windows_semaphore &);
+   public:
+
+   windows_semaphore(unsigned int initialCount);
+   ~windows_semaphore();
+
+   void post(long release_count = 1);
+   void wait();
+   bool try_wait();
+   bool timed_wait(const boost::posix_time::ptime &abs_time);
+
+   private:
+   const sync_id id_;
+};
+
+inline windows_semaphore::windows_semaphore(unsigned int initialCount) 
+   : id_()
+{
+   sync_handles &handles =
+      intermodule_singleton<sync_handles>::get();
+   //Force smeaphore creation with the initial count
+   bool open_or_created;
+   handles.obtain_semaphore(this->id_, initialCount, &open_or_created);
+   //The semaphore must be created, never opened
+   assert(open_or_created);
+   assert(open_or_created && winapi::get_last_error() != winapi::error_already_exists);
+   (void)open_or_created;
+}
+
+inline windows_semaphore::~windows_semaphore() 
+{
+   sync_handles &handles =
+      intermodule_singleton<sync_handles>::get();
+   handles.destroy_handle(this->id_);
+}
+
+inline void windows_semaphore::wait(void)
+{
+   sync_handles &handles =
+      intermodule_singleton<sync_handles>::get();
+   //This can throw
+   void *hnd = handles.obtain_semaphore(this->id_, 0);
+   unsigned long ret = winapi::wait_for_single_object(hnd, winapi::infinite_time);
+   if(ret == winapi::wait_failed){
+      error_info err(winapi::get_last_error());
+      throw interprocess_exception(err);
+   }
+}
+
+inline bool windows_semaphore::try_wait(void)
+{
+   sync_handles &handles =
+      intermodule_singleton<sync_handles>::get();
+   //This can throw
+   void *hnd = handles.obtain_semaphore(this->id_, 0);
+   unsigned long ret = winapi::wait_for_single_object(hnd, 0);
+   if(ret == winapi::wait_failed){
+      error_info err(winapi::get_last_error());
+      throw interprocess_exception(err);
+   }
+   return ret != winapi::wait_timeout;
+}
+
+inline bool windows_semaphore::timed_wait(const boost::posix_time::ptime &abs_time)
+{
+   if(abs_time == boost::posix_time::pos_infin){
+      this->wait();
+      return true;
+   }
+   boost::posix_time::ptime now
+      = boost::posix_time::microsec_clock::universal_time();
+
+   unsigned long ms = (unsigned long)(abs_time-now).total_milliseconds();
+   sync_handles &handles =
+      intermodule_singleton<sync_handles>::get();
+   //This can throw
+   void *hnd = handles.obtain_semaphore(this->id_, 0);
+   unsigned long ret = winapi::wait_for_single_object(hnd, ms);
+   if(ret == winapi::wait_failed){
+      error_info err(winapi::get_last_error());
+      throw interprocess_exception(err);
+   }
+   return ret != winapi::wait_timeout;
+}
+
+inline void windows_semaphore::post(long release_count)
+{
+   sync_handles &handles =
+      intermodule_singleton<sync_handles>::get();
+   //This can throw
+   void *hnd = handles.obtain_semaphore(this->id_, 0);
+   long prev_count;
+   int ret = winapi::release_semaphore(hnd, release_count, &prev_count);
+   (void)ret;
+   assert(ret);
+}
+
+}  //namespace ipcdetail {
+}  //namespace interprocess {
+}  //namespace boost {
+
+#include <boost/interprocess/detail/config_end.hpp>
+
+#endif   //BOOST_INTERPROCESS_DETAIL_WINDOWS_SEMAPHORE_HPP