From: Ian Leitch <port001@...>
Date: 2007-09-07T18:10:02+09:00
Subject: Trapped signals killing my subprocesses

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Hey list,

I have a problem with trapping signals in the main thread whilst a
subprocess is running in another thread. The signal is properly trapped,
however it doesn't seem to stop the signal from being sent to the
subprocess. Is this an inherent side effect of green thread implementations?
Can anyone suggest a workaround?

The code here demonstrates my problem. Run it, and hit ^C. My expectation
was not to see 'killed :(' until the 10 seconds are up.

#!/usr/bin/ruby

class Sleeper < Thread

  def initialize
    super do
      IO.popen('sleep 10') {|f| puts f.gets }
      puts "killed :("
    end
  end
end

Signal.trap('INT') { puts "Signal trapped." }

a = Sleeper.new
a.join


Cheers
Ian

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