Using Unix Process Controll Methods in Ruby
- by John F. Miller
Ryan Tomayko touched off quite a fire storm with this post about using Unix process control commands.
We should be doing more of this. A lot more of this. I'm talking about fork(2), execve(2), pipe(2), socketpair(2), select(2), kill(2), sigaction(2), and so on and so forth. These are our friends. They want so badly just to help us.
I have a bit of code (a delayed_job clone for DataMapper that I think would fit right in with this, but I'm not clear on how to take advantage of the listed commands. Any Ideas on how to improve this code?
def start
say "*** Starting job worker #{@name}"
t = Thread.new do
loop do
delay = Update.work_off(self)
break if $exit
sleep delay
break if $exit
end
clear_locks
end
trap('TERM') { terminate_with t }
trap('INT') { terminate_with t }
trap('USR1') do
say "Wakeup Signal Caught"
t.run
end
end
