@CheckForNull private volatile Object mutexDoNotUseDirectly;

  private Object mutex() {
    Object mutex = mutexDoNotUseDirectly;
    if (mutex == null) {
      synchronized (this) {
        mutex = mutexDoNotUseDirectly;
        if (mutex == null) {
          mutexDoNotUseDirectly = mutex = new Object();
        }
      }
    }
    return mutex;
  }

     */
    @Override
    public boolean isStale () {
        return !this.open || ( this.handle != null && !this.handle.isValid() );
    }


    @Override
    public synchronized SmbFileHandleImpl ensureOpen () throws CIFSException {
        if ( !this.open ) {
            throw new SmbException("Pipe handle already closed");
        }

        if ( !isOpen() ) {

// (st_size, as made by say ftruncate(2)), would require a metadata flush.
//
// The aim of fdatasync() is to reduce disk activity for applications that
// do not require all metadata to be synchronized with the disk.
func Fdatasync(f *os.File) error {
	return syscall.Fdatasync(int(f.Fd()))
}

// FadviseDontNeed invalidates page-cache
func FadviseDontNeed(f *os.File) error {

   * @return a synchronized view of the specified navigable set.
   * @since 13.0
   */
  @GwtIncompatible // NavigableSet
  @J2ktIncompatible // Synchronized
  public static <E extends @Nullable Object> NavigableSet<E> synchronizedNavigableSet(
      NavigableSet<E> navigableSet) {
    return Synchronized.navigableSet(navigableSet);
  }

      sink.writeUtf8("\r\n")
      sink.write(source, byteCount)
      sink.writeUtf8("\r\n")
    }

    @Synchronized
    override fun flush() {
      if (closed) return // Don't throw; this stream might have been closed on the caller's behalf.
      sink.flush()
    }

    @Synchronized
    override fun close() {
      if (closed) return
      closed = true
      sink.writeUtf8("0\r\n\r\n")

        buffer.append(repository.getUrl());

        return buffer.toString();
    }

    private void writeLastUpdated(File touchfile, String key, String error) {
        synchronized (touchfile.getAbsolutePath().intern()) {
            if (!touchfile.getParentFile().exists()
                    && !touchfile.getParentFile().mkdirs()) {
                getLogger()

            if (strictView && ioe instanceof SmbAuthException) {
                throw (SmbAuthException)ioe;
            }
        }
        return null;
    }
    public synchronized DfsReferral resolve(String domain,
                String root,
                String path,
                NtlmPasswordAuthentication auth) throws SmbAuthException {
        DfsReferral dr = null;

    protected boolean noWaitOnFolder = false;

    protected void startCrawling() {
        synchronized (crawlerContext.activeThreadCountLock) {
            crawlerContext.activeThreadCount++;
        }
    }

    protected void finishCrawling() {
        synchronized (crawlerContext.activeThreadCountLock) {
            crawlerContext.activeThreadCount--;
        }
    }

    @Override
    public DefaultSettingsBuildingRequest setSystemProperties(Properties systemProperties) {
        if (systemProperties != null) {
            this.systemProperties = new Properties();
            synchronized (systemProperties) { // avoid concurrent modification if someone else sets/removes an unrelated
                // system property
                this.systemProperties.putAll(systemProperties);
            }

    return result;
  }

  @GwtIncompatible // java.lang.ref.WeakReference
  static <T extends Enum<T>> Map<String, WeakReference<? extends Enum<?>>> getEnumConstants(
      Class<T> enumClass) {
    synchronized (enumConstantCache) {
      Map<String, WeakReference<? extends Enum<?>>> constants = enumConstantCache.get(enumClass);
      if (constants == null) {
        constants = populateCache(enumClass);
      }