i'd like a way to fork a child, while will have a heartbeat thread running
pinging the parent, partial example:

class Slave
   def initialize
     unless fork
       Thread.abort_on_exception = true
       Thread::new do
         loop do
           Process::kill 0, Process::ppid
           sleep 42
         end
       end
       yield
     end
   end
end

slave =
   Slave::new do
     loop do
       FileUtils::touch 'sentinal'
       sleep 42
     end
   end

in case it isn't clear, this slave dies if it's parent dies.  in the real code
there is a method to kill the slave, the slave is detached, etc.

the thing is, i want the slave to execute 'exit!' not 'exit' on thread error
such that exit handlers do not get run.

any thoughts on how to do this?

perhaps redefining Kernel#exit in the slave?

-a
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