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require 'drb/drb'

class Vault

  # vault has it's own URI stored
  SOCK = '/tmp/drb-prototype_vault.sock'
  URI  = "drbunix:#{SOCK}"

  def initialize
    @mutex = Mutex.new

    @shared_value = 0

    puts 'Vault initialized'
  end

  def inc
    @mutex.synchronize {
      @shared_value += 1
    }
  end

  def val
    @shared_value
  end

end

$ ruby controller.rb
Start
Make sure Vault is up and running
Booting Vault
Vault initialized
Waiting processing forks to finish
[2] value: 0
[2] value: 1
[3] value: 2
[1] value: 3
[2] value: 4
[3] value: 5
[2] value: 6
[3] value: 7
[1] value: 8
[3] value: 9
[2] value: 10
[1] value: 11
[3] value: 12
[1] value: 13
[2] value: 14
[3] value: 15
[2] value: 16
[3] value: 17
[1] value: 18
[3] value: 19
[2] value: 20
[1] value: 21
[2] value: 22
[3] value: 23
[1] value: 24
[3] value: 25
[2] value: 26
[1] value: 27
[1] value: 28
[1] value: 29
Final value: 30
Shutting down vault
All finished

require 'drb/drb'

class Function

  def initialize
    @vault = DRbObject.new_with_uri Vault::URI
  end

  def perform
    pids = []

    (1..3).each do |i|

      pids << fork {
        vault = DRbObject.new_with_uri Vault::URI
        (1..10).each {
          sleep rand
          puts "[#{i}] value: #{vault.val}"
          vault.inc
        }
        exit 0
      }

    end

    puts 'Waiting processing forks to finish'
    pids.each do |pid|
      Process.waitpid(pid)
    end

    puts "Final value: #{@vault.val}"
  end

end

require 'fileutils'
require 'timeout'
require 'drb/drb'

require_relative 'vault'
require_relative 'function'

class Controller

  def initialize
    puts 'Start'

    @vault_pid = fork do
      # init vault's process
      puts 'Booting Vault'
      FileUtils.rm_f Vault::SOCK
      DRb.start_service Vault::URI, Vault.new
      DRb.thread.join
    end
    Process.detach @vault_pid

    # guard the boot process
    puts 'Make sure Vault is up and running'
    Timeout::timeout(10) {
      until File.exists? Vault::SOCK do
        sleep 0.1
      end
      true
    }

  end

  def perform
    Function.new.perform

  ensure
    puts 'Shutting down vault'
    Process.kill 'HUP', @vault_pid
    puts 'All finished'
  end

end

Controller.new.perform