synchronized (this) {
        if (!executed) {
          runnables = new RunnableExecutorPair(runnable, executor, runnables);
          return;
        }
      }
      executeListener(runnable, executor);
    }

    void execute() {
      RunnableExecutorPair list;
      synchronized (this) {
        if (executed) {
          return;
        }

     * @param size the maximum number of items to return
     * @return a PagingList containing the requested subset of mapping items
     */
    @Override
    public synchronized PagingList<CharMappingItem> selectList(final int offset, final int size) {
        if (mappingItemList == null) {
            reload(null);
        }

        if (offset >= mappingItemList.size() || offset < 0) {

    webSocket = slackApi.rtm(rtmStartResponse.url, this);
  }

  // TODO(jwilson): can I read the response body? Do I have to?
  //                the body from slack is a 0-byte-buffer
  @Override public synchronized void onOpen(WebSocket webSocket, Response response) {
    System.out.println("onOpen: " + response);
  }

  // TOOD(jwilson): decode incoming messages and dispatch them somewhere.

    long result = in.skip(n);
    count += result;
    return result;
  }

  @Override
  public synchronized void mark(int readlimit) {
    in.mark(readlimit);
    mark = count;
    // it's okay to mark even if mark isn't supported, as reset won't work
  }

  @Override
  public synchronized void reset() throws IOException {
    if (!in.markSupported()) {
      throw new IOException("Mark not supported");
    }

  @Override
  public void publish(@Nullable LogRecord record) {
    synchronized (lock) {
      if (record != null) {
        list.add(record);
      }
    }
  }

  @Override
  public void flush() {}

  @Override
  public void close() {}

  public void clear() {
    synchronized (lock) {
      list.clear();
    }
  }

  /** Returns a snapshot of the logged records. */

        SmbFileOutputStream out = mock(SmbFileOutputStream.class);
        byte[] payload = new byte[] { 1, 2, 3, 4 };

        w.start();

        // Wait until writer thread signals readiness
        synchronized (w) {
            long deadline = System.currentTimeMillis() + 2000;
            while (!w.isReady() && System.currentTimeMillis() < deadline) {
                w.wait(10);
            }

            return matches(tree.share, tree.service);
        }
        return false;
    }

    void send(final ServerMessageBlock request, final ServerMessageBlock response) throws SmbException {
        synchronized (session.transport()) {
            if (response != null) {
                response.received = false;
            }
            treeConnect(request, response);

        this.bufferSize = maxSize;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.BufferCache#getBuffer()
     */
    @Override
    public byte[] getBuffer() {
        synchronized (this.cache) {
            byte[] buf;

            if (this.freeBuffers > 0) {
                for (int i = 0; i < this.cache.length; i++) {
                    if (this.cache[i] != null) {

    }

    synchronized SmbTransport transport() {
        if (transport == null) {
            transport = SmbTransport.getSmbTransport(address, port, localAddr, localPort, null);
        }
        return transport;
    }

    void send(final ServerMessageBlock request, final ServerMessageBlock response) throws SmbException {
        synchronized (transport()) {
            if (response != null) {

            }
        }
    }

    protected synchronized void doDisconnect(final boolean hard) throws IOException {
        doDisconnect(hard, false);
    }

    @Override
    protected synchronized boolean doDisconnect(final boolean hard, final boolean inUse) throws IOException {