class ParallelTests::CLI

def handle_interrupt
  @graceful_shutdown_attempted ||= false
  Kernel.exit if @graceful_shutdown_attempted
  # In a shell, all sub-processes also get an interrupt, so they shut themselves down.
  # In a background process this does not happen and we need to do it ourselves.
  # We cannot always send the interrupt since then the sub-processes would get interrupted twice when in foreground
  # and that messes with interrupt handling.
  #
  # (can simulate detached with `(bundle exec parallel_rspec test/a_spec.rb -n 2 &)`)
  # also the integration test "passes on int signal to child processes" is detached.
  #
  # On windows getpgid does not work so we resort to always killing which is the smaller bug.
  #
  # The ParallelTests::Pids `synchronize` method can't be called directly from a trap,
  # using Thread workaround https://github.com/ddollar/foreman/issues/332
  Thread.new do
    if Gem.win_platform? || ((child_pid = ParallelTests.pids.all.first) && Process.getpgid(child_pid) != Process.pid)
      ParallelTests.stop_all_processes
    end
  end
  @graceful_shutdown_attempted = true
end