[boost] [shared_ptr] how does quick_allocator free its memory pool?

I am trying to enable BOOST_SP_USE_QUICK_ALLOCATOR while using shared_ptr, so to make shared_ptr to use quick_allocator to alloc/dealloc memory, But it seems that quick_allocator never free the memory pool (blocks) after my program exits, do I miss something? Or do I need extra step to use quick_allocator? I am using boost cvs head, vs2005, and disabled BOOST_HAS_THREADS (yes, for speed issue, same reason for using quick_allocator), vs2005.