Using signals in the ye olde UNIX fashion is bad. However, that was entirely fixed with the advent of POSIX threads: block all signals in all threads with sigp

Using signals in the ye olde UNIX fashion is bad. However, that was entirely fixed with the advent of POSIX threads: block all signals in all threads with sigprocmask(), and have a dedicated signal-handling thread that loops around on sigwaitinfo(). That thread then handles signals entirely synchronously, notifying other parts of the program using usual inter-thread communication.