Add fallback "stop the world" options.

[flowchartsman]

In the event that the process is still alive after the user should optionally be able to specify that they want a shutdown that will proceed no matter what. In linux, this might be something like

echo 1 > /proc/sys/kernel/sysrq 
echo b > /proc/sysrq-trigger

And in OSX/Windows a syscall that will force a panic/bluescreen.

[omern1]

in windows, shutdown -f will shutdown the system no matter what.

[flowchartsman]

More testing is necessary to be sure. I'm inclined to agree, but I want to make sure I'm not missing something.