/**
     * Initialize singleton context using custom properties
     * 
     * This method can only be called once.
     * 
     * @param props
     * @throws CIFSException
     */
    public static synchronized final void init ( Properties props ) throws CIFSException {
        if ( INSTANCE != null ) {
            throw new CIFSException("Singleton context is already initialized");
        }
        Properties p = new Properties();

     * is queried frequently and exceptions would be rather costly to
     * throw on a regular basis here.
     */

    public synchronized static NbtAddress getByName( String host ) {
        return getByName( new Name( host, 0x20, null ));
    }

    synchronized static NbtAddress getByName( Name name ) {
        NbtAddress result = null;

        try {
            if( FILENAME != null ) {

    results: MutableList<InetAddress>,
    failures: MutableList<Exception>,
  ) {
    try {
      val addresses = readResponse(hostname, response)
      synchronized(results) {
        results.addAll(addresses)
      }
    } catch (e: Exception) {
      synchronized(failures) {
        failures.add(e)
      }
    }
  }

  @Throws(UnknownHostException::class)
  private fun throwBestFailure(

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

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

    /**
     * Set the default <tt>NtlmAuthenticator</tt>. Once the default authenticator is set it cannot be changed. Calling
     * this metho again will have no effect.
     * 
     * @param a
     */

    public synchronized static void setDefault ( NtlmAuthenticator a ) {
        if ( auth != null ) {
            return;
        }
        auth = a;
    }


    /**
     * 

   * Multimap#replaceValues} methods return collections that aren't synchronized.
   *
   * <p>The returned multimap will be serializable if the specified multimap is serializable.
   *
   * @param multimap the multimap to be wrapped in a synchronized view
   * @return a synchronized view of the specified multimap
   */
  @J2ktIncompatible // Synchronized
  public static <K extends @Nullable Object, V extends @Nullable Object>

            return url;
        }
        return replaceUrl(pathMappingList, url);
    }

    public String replaceUrls(final String text) {
        if (cachedPathMappingList == null) {
            synchronized (this) {
                if (cachedPathMappingList == null) {
                    init();
                }
            }
        }
        String result = text;

    // Lock while we check state. We must maintain the lock while adding the new pair so that
    // another thread can't run the list out from under us. We only add to the list if we have not
    // yet started execution.
    synchronized (this) {
      if (!executed) {
        runnables = new RunnableExecutorPair(runnable, executor, runnables);
        return;
      }
    }

      synchronized (state) {
        if (state.seenExceptions == expect) {
          state.seenExceptions = update;
        }
      }
    }

    @Override
    int decrementAndGetRemainingCount(AggregateFutureState<?> state) {
      synchronized (state) {
        return --state.remaining;
      }
    }
  }

     *
     * @param factory
     *            The URL stream handler factory.
     */
    public static void setURLStreamHandlerFactory ( URLStreamHandlerFactory factory ) {
        synchronized ( PROTOCOL_HANDLERS ) {
            if ( Handler.factory != null ) {
                throw new IllegalStateException("URLStreamHandlerFactory already set.");
            }
            PROTOCOL_HANDLERS.clear();