I just ran intel's thread checker on a code I am developing using boost::thread and boost::function. It issued some error notifications arising from "function_template.hpp" The following is for boost 1.36.0: Memory read at "function_template.hpp":770 conflicts with a prior memory write at "function_template.hpp":414 (flow dependence) Memory read at "function_template.hpp":288 conflicts with a prior memory write at "function_template.hpp":414 (flow dependence) Memory read at "function_template.hpp":289 conflicts with a prior memory write at "function_template.hpp":414 (flow dependence) I really don't understand the internals of boost::function, so I have no idea whether this is a legitimate error, or if intel's thread checker is confused... James