Index: boost/thread/detail/thread.hpp
===================================================================
--- boost/thread/detail/thread.hpp	(revision 395)
+++ boost/thread/detail/thread.hpp	(working copy)
@@ -27,6 +27,12 @@
 
 #include <boost/config/abi_prefix.hpp>
 
+/** Enabling the boost thread extension, will enable a cached version of
+ *  boost::this_thread::get_id() and the retrieval of the main thread::id
+ *  via boost::main_thread::get_id(), both base on thread_ext.hpp.
+ */
+#define BOOST_THREAD_EXT
+
 #ifdef BOOST_MSVC
 #pragma warning(push)
 #pragma warning(disable:4251)
@@ -374,7 +380,11 @@
 
     namespace this_thread
     {
+#ifndef BOOST_THREAD_EXT
         thread::id BOOST_THREAD_DECL get_id();
+#else
+        struct handler;
+#endif
 
         void BOOST_THREAD_DECL interruption_point();
         bool BOOST_THREAD_DECL interruption_enabled();
@@ -395,7 +405,12 @@
             thread_data(thread_data_)
         {}
         friend class thread;
+
+#ifndef BOOST_THREAD_EXT
         friend id BOOST_THREAD_DECL this_thread::get_id();
+#else
+        friend struct this_thread::handler;
+#endif
     public:
         id():
             thread_data()
@@ -523,6 +538,10 @@
     }
 }
 
+#ifdef BOOST_THREAD_EXT
+#include <boost/thread/detail/thread_ext.hpp>
+#endif
+
 #ifdef BOOST_MSVC
 #pragma warning(pop)
 #endif
Index: boost/thread/detail/thread_ext.hpp
===================================================================
--- boost/thread/detail/thread_ext.hpp	(revision 0)
+++ boost/thread/detail/thread_ext.hpp	(revision 0)
@@ -0,0 +1,54 @@
+/**
+ * @note Copyright\n
+ *     ADOxx for Windows and Linux\n
+ *      (C) COPYRIGHT BOC - Business Objectives Consulting 1996-2011\n
+ *      All Rights Reserved\n
+ *      Use, duplication or disclosure restricted by BOC Information Systems\n
+ *      Vienna, 2011
+ * @brief
+ * @author iloehken, 2011
+ *
+ */
+
+#ifdef _MSC_VER
+#pragma once
+#endif
+
+#ifndef THREAD_THREAD_EXT_HPP_
+#define THREAD_THREAD_EXT_HPP_
+
+namespace boost { namespace this_thread
+{
+  //--------------------------------------------------------------------
+  struct BOOST_THREAD_DECL handler
+  //--------------------------------------------------------------------
+  {
+  private:
+    static thread::id const make_id(); // called once by get_id to initialize caching and abstract from platform
+
+  public:
+    static thread::id const& get_id();
+    static thread::id const& get_main_id();
+  };
+
+  //--------------------------------------------------------------------
+  inline thread::id const&
+  get_id()
+  //--------------------------------------------------------------------
+  {
+    return handler::get_id();
+  }
+} // namespace this_thread
+
+namespace main_thread
+{
+  //--------------------------------------------------------------------
+  inline thread::id const&
+  get_id()
+  //--------------------------------------------------------------------
+  {
+    return this_thread::handler::get_main_id();
+  }
+}} // namespace boost::main_thread
+
+#endif
Index: libs/thread/src/pthread/thread.cpp
===================================================================
--- libs/thread/src/pthread/thread.cpp	(revision 395)
+++ libs/thread/src/pthread/thread.cpp	(working copy)
@@ -449,7 +449,11 @@
 
     namespace this_thread
     {
+#ifndef BOOST_THREAD_EXT
         thread::id get_id()
+#else
+        boost::thread::id const handler::make_id()
+#endif
         {
             boost::detail::thread_data_base* const thread_info=get_or_make_current_thread_data();
             return thread::id(thread_info?thread_info->shared_from_this():detail::thread_data_ptr());
@@ -600,3 +604,7 @@
 
 
 }
+
+#ifdef BOOST_THREAD_EXT
+#include "../thread_ext.inl"
+#endif
Index: libs/thread/src/thread_ext.inl
===================================================================
--- libs/thread/src/thread_ext.inl	(revision 0)
+++ libs/thread/src/thread_ext.inl	(revision 0)
@@ -0,0 +1,69 @@
+/**
+ * @note Copyright\n
+ *     ADOxx for Windows and Linux\n
+ *      (C) COPYRIGHT BOC - Business Objectives Consulting 1996-2011\n
+ *      All Rights Reserved\n
+ *      Use, duplication or disclosure restricted by BOC Information Systems\n
+ *      Vienna, 2011
+ * @brief
+ * @author iloehken, 2011
+ *
+ */
+
+#include <boost/pool/detail/singleton.hpp>
+
+namespace boost { namespace this_thread {
+
+//--------------------------------------------------------------------
+boost::thread::id const&
+handler::get_id()
+//--------------------------------------------------------------------
+{
+  /** ILO : 24/02/2011
+   *  Injected code, that stores the thread id in thread specific_ptr
+   *  to speed up access, because without caching the retrieval of the
+   *  current thread id is really slow (60 times faster with caching)
+   */
+  static boost::thread_specific_ptr<thread::id> aCachedID;
+
+  if(boost::thread::id* pThreadID = aCachedID.get())
+  {
+    return *pThreadID;
+  }
+
+  aCachedID.reset(new thread::id(handler::make_id()));
+  return *aCachedID.get();
+}
+
+namespace {
+
+/** ILO : 24/02/2011
+ *
+ *  Simple Holder for MainThreadID used with recurring static
+ *  initialization scheme to determine the main thread in a safe way.
+ */
+//--------------------------------------------------------------------
+struct main_id
+//--------------------------------------------------------------------
+{
+  boost::thread::id const m_id;;
+
+  //--------------------------------------------------------------------
+  explicit main_id()
+    : m_id(boost::this_thread::get_id())
+  //--------------------------------------------------------------------
+  {}
+};
+
+} // namespace anonymous
+
+//--------------------------------------------------------------------
+boost::thread::id const&
+handler::get_main_id()
+//--------------------------------------------------------------------
+{
+  return boost::details::pool::singleton_default<main_id>::instance().m_id;
+}
+
+}}
+
Index: libs/thread/src/win32/thread.cpp
===================================================================
--- libs/thread/src/win32/thread.cpp	(revision 395)
+++ libs/thread/src/win32/thread.cpp	(working copy)
@@ -482,7 +482,11 @@
             return false;
         }
 
+#ifndef BOOST_THREAD_EXT
         thread::id get_id()
+#else
+        boost::thread::id const handler::make_id()
+#endif
         {
             return thread::id(get_or_make_current_thread_data());
         }
@@ -621,4 +625,6 @@
 
 }
 
-
+#ifdef BOOST_THREAD_EXT
+#include "../thread_ext.inl"
+#endif