[boost] [Block Pointer] multithread help

Hi everybody, I was wondering if there is anybody familiar enough with Block Pointer that could give me a hand regarding multithread support. Once again the test file is at: https://svn.boost.org/svn/boost/sandbox/block_ptr/libs/smart_ptr/example/thr... The main class I am trying to protect with a mutex is block_header from: https://svn.boost.org/svn/boost/sandbox/block_ptr/boost/block_ptr.hpp Thanks, -Phil