Option 1) is not feasible though, as you'll block your one thread.

Though I wonder if you can work around all this by using signalfd (http://man7.org/linux/man-pages/man2/signalfd.2.html) and have SIGCHLD delivered through normal file descriptors - I don't know the low levels of Go enough to know if you can integrate a raw file descriptor with its runtime, or whether messing with SIGCHLD causes other issues, but it might be worth pursuing.