Hi
I’ve spend a fair amount of time today on a thing that puzzles me.
Trapping signals in a thread has varying outcome depending on the method
used.
The following code will ignore CTRL-C in a terminal and won’t die until
the sleep process exists after 3 seconds.
puts ‘sleeping’
t=Thread.new do
trap(“INT”, “IGNORE”)
sleep 3
end
t.join
puts “exiting”
However, trapping the signal like so, will also signal sleep (and kill
it).
puts ‘sleeping’
t=Thread.new do
trap(“INT”) { puts ‘got int’ }
sleep 3
end
t.join
puts “exiting”
I’m aware that all the children of the process should receive the
signal. I just don’t understand the difference in outcome (I know that
the implementation in MRI is different).
Ideally what I’d like to have is a solution where I’m able to CTRL-C a
multithreaded program and not have it kill its children.
Hope this makes sense 