github.com/forkbreak/fork_break - usage example

fork_break_usage_example.rb

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'

  gem 'fork_break'
end

process1, process2, process3 = Array.new(3) do |i|
  ForkBreak::Process.new do |breakpoints|
    random = Random.rand(1.0)
    puts "sleep for #{random}"
    sleep(random)
    breakpoints << :after_sleep_1
    puts "Process: #{i}"
    puts Time.now.strftime('%Y-%m-%d %H:%M:%S.%3N')
    sleep(2)
    breakpoints << :after_sleep_2
  end
end

process1.run_until(:after_sleep_1).wait
process2.run_until(:after_sleep_1).wait
process3.run_until(:after_sleep_1).wait

process1.finish
process2.finish
process3.finish.wait

Approx. output:

sleep for 0.36983955185930006
Process: 0
2017-12-12 22:30:20.539
sleep for 0.42565121857340893
Process: 2
2017-12-12 22:30:20.539
sleep for 0.8146626645464919
Process: 1
2017-12-12 22:30:20.539
[Finished in 4.0s]