module ParallelTests

def with_pid_file
  Tempfile.open('parallel_tests-pidfile') do |f|
    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