--- C:/Boost/boost_1_51_0/boost/thread/win32/thread_primitives.hpp	Fr Aug 24 11:31:54 2012
+++ C:/Boost/boost_1_51_0/boost/thread/win32/thread_primitives.hpp.fix	Fr Aug 24 11:39:27 2012
@@ -349,7 +349,7 @@
                     setc al;
                 };
 #else
-                bool ret;
+                bool ret = false;
                 __asm {
                     mov eax,bit; mov edx,x; lock bts [edx],eax; setc al; mov ret, al
                 };
@@ -370,7 +370,7 @@
 #else
 
 
-                bool ret;
+                bool ret = false;
                 __asm {
                     mov eax,bit; mov edx,x; lock btr [edx],eax; setc al; mov ret, al
                 };