This sort of situation (compiler doesn't quite do what the writer wants) is actually widely encountered in some classic Unix kernels. There are parts of the kernel that need interlocking, running at a different priority, etc. The "classic" way of doing this is to compile the C code into assembly code, run a program that massages the assembly code to change the details of how some actions are done, and then assemble the modified code. As the old fortune cookie program says, "I'd rather write programs that write programs than write programs" :-). -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927