private static boolean multithread(final Option option) throws InterruptedException {
		Log.info("Using several threads: " + option.getNbThreads());
		final ExecutorService executor = Executors.newFixedThreadPool(option.getNbThreads());
		final AtomicBoolean errors = new AtomicBoolean(false);
		for (String s : option.getResult()) {
			final FileGroup group = new FileGroup(s, option.getExcludes(), option);
			for (final File f : group.getFiles()) {
				final Future<?> future = executor.submit(new Runnable() {
					public void run() {
						if (errors.get()) {
							return;
						}
						try {
							final boolean error = manageFileInternal(f, option);
							if (error) {
								errors.set(true);
							}
						} catch (IOException e) {
							e.printStackTrace();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				});
			}
		}
		executor.shutdown();
		executor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
		return errors.get();
	}