I'm trying to dynamically add directories from a config file before I enter my programs main loop using the ASIO dir monitor example. I've not been able to understand the internals yet. Below is my current iteration of what I'm trying. I have been able to get the simple examples running just like in the async.cpp file. But I can't get adding dirs dynamically working and was hoping someone could offer suggestions. Any help much appreciated. void my_file_handler(const boost::system::error_code &ec, const boost::asio::dir_monitor_event &ev) { // event stuff ... return; } boost::asio::dir_monitor *dm; boost::asio::io_service io_service; vector vecdm; for (vector<Directories>::iterator it = dirs->begin(); it != dirs->end(); ++it) { dm = new boost::asio::dir_monitor(io_service); dm->add_directory((*it).abs_dir_path); vecdm.push_back(dm); } boost::thread t = boost::thread(boost::bind(&boost::asio::io_service::run, boost::ref(io_service))); while (true) { // MAIN PROGRAM LOOP for (vector::iterator it = vecdm.begin(); it != vecdm.end(); ++it) { (*it)->async_monitor(my_file_handler); } io_service.reset(); // DO PROGRAM STUFF ... } ~ ~