Hi, I use Boost::process::status, and it's a very simple and efficient implementation for working with asynchronous operations on process. But have restriction for use, as cited. I think you should give a chance. And all implementations use ASIO, Is no longer a different implementation, more code more bug, and if some people need understand or create a new feature and already know boost.asio, is simple. I think try implements this idea is good. And Windows I don't know =). typedef enum { wait_default, // using thread+waitpid per-process on POSIX OS wait_using_sigaction, // install signal handler wait_using_sigwaitinfo, // install signal handler wait_polling, // poll all waiting pids for end, when // requested - for example by user's signal // handler } wait_method_type; Bruno