module ParallelTests

def with_pid_file
  Tempfile.open('parallel_tests-pidfile') do |f|
    begin
      ENV['PARALLEL_PID_FILE'] = f.path
      # Pids object should be created before threads will start adding pids to it
      # Otherwise we would have to use Mutex to prevent creation of several instances
      @pids = pids
      yield
    ensure
      ENV['PARALLEL_PID_FILE'] = nil
      @pids = nil
    end
  end
end