ruby-em-fork.rb

require 'eventmachine'

# Code adapted from EM's tests:
# https://github.com/eventmachine/eventmachine/blob/master/tests/test_processes.rb#L43

ls = ""
EM.run {
  start_process = Proc.new do |id|
    d = EM::DeferrableChildProcess.open( "/bin/bash -c 'slee 1 2> /tmp/err-em.log'" )
    d.callback {|*args|
      ls = " cmd completed for #{id}"+ args.inspect
      puts ls
#      start_process.call(id)
    }
    d.errback do |fail_status|
      puts "cmd failed"
      puts fail_status
    end
  end
  start_process.call(1)
  start_process.call(2)
  start_process.call(3)

}


puts "All done."

puts ls