local $SIG{'KILL'} = sub { threads->exit(); };
Why? If all you are going to do is terminate, why not just let that happen?
Well, it will "just happen". SIGKILL can't be caught, blocked or ignored. The process will simply be forced to exit when a SIGKILL is sent, the sub will never be invoked. Unless, of course, you run that code on a very strange non-POSIX system with a different signals implementation.
Alexander
--
Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)
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