diff -bur boost_1_32_0/boost/detail/lwm_win32.hpp boost_1_32_0.patched/boost/detail/lwm_win32.hpp
--- boost_1_32_0/boost/detail/lwm_win32.hpp	2004-07-26 02:31:59.000000000 +0200
+++ boost_1_32_0.patched/boost/detail/lwm_win32.hpp	2005-02-21 12:58:18.640625000 +0100
@@ -37,11 +37,15 @@

 // Intel 6.0 on Win64 version, posted by Tim Fenders to [boost-users]

+#if defined (__INTEL_COMPILER)
 extern "C" long_type __cdecl _InterlockedExchange(long volatile *, long);
+#elif defined (_MSC_VER)
+extern "C" long __cdecl _InterlockedExchange(long volatile *, long);
+#endif

 #pragma intrinsic(_InterlockedExchange)

-inline long InterlockedExchange(long volatile* lp, long l)
+inline long InterlockedExchangeBoost(long volatile* lp, long l)
 {
     return _InterlockedExchange(lp, l);
 }
@@ -87,7 +91,11 @@

         explicit scoped_lock(lightweight_mutex & m): m_(m)
         {
+#if defined (_WIN64)
+            while( InterlockedExchangeBoost(&m_.l_, 1) )
+#else
             while( InterlockedExchange(&m_.l_, 1) )
+#endif
             {
                 // Note: changed to Sleep(1) from Sleep(0).
                 // According to MSDN, Sleep(0) will never yield
@@ -100,8 +108,11 @@

         ~scoped_lock()
         {
+#if defined (_WIN64)
+            InterlockedExchangeBoost(&m_.l_, 0);
+#else
             InterlockedExchange(&m_.l_, 0);
-
+#endif
             // Note: adding a yield here will make
             // the spinlock more fair and will increase the overall
             // performance of some applications substantially in