catching SIGINT in a multithreaded program

Question

I am writing a multithreaded program where I want to handle a possible Ctrl-C command from the user to terminate execution. As far as I know there is no guarantee

Answer 1

You can block signals from the calling thread with pthread_sigmask().

And, as the blocked signals are inherited to newly created threads, you can block SIGINT in the main thread, then launch your other threads, and then unblock it in the main thread, if that is preferable.