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~/NetBeansProjects/jruby ➔ ../rubinius/bin/rbx vm_thing.rb 
in parent: 1
child = 2
in child: 2
parent = 1
~/NetBeansProjects/jruby ➔ jruby vm_thing.rb 
in parent: 7214088
child = 2950275
in child: 2950275
parent = 7214088
~/NetBeansProjects/jruby ➔ cat vm_thing.rb
begin
  require 'jruby/vm'
rescue LoadError; end

child_vm = Rubinius::VM.spawn('-e', <<'END')
  puts "in child: #{Rubinius::VM_ID}"
  parent = Rubinius::VM.get_message
  puts "parent = #{parent}"
  Rubinius::VM.send_message(parent, Rubinius::VM_ID)
END

puts "in parent: #{Rubinius::VM_ID}"
Rubinius::VM.send_message(child_vm.id, Rubinius::VM_ID)
child = Rubinius::VM.get_message
puts "child = #{child}"

puts child_vm.stdout.readpartial(1024)
~/NetBeansProjects/jruby ➔ ../rubinius/bin/rbx vm_thing.rb 
in parent: 1
child = 2
in child: 2
parent = 1
~/NetBeansProjects/jruby ➔ jruby vm_thing.rb 
in parent: 7214088
child = 1389308
in child: 1389308
parent = 7214088