*     method
   * @throws IOException if {@code swallowIOException} is false and {@link Flushable#flush} throws
   *     an {@code IOException}.
   * @see Closeables#close
   */
  public static void flush(Flushable flushable, boolean swallowIOException) throws IOException {
    try {
      flushable.flush();
    } catch (IOException e) {
      if (swallowIOException) {

   *     method
   * @throws IOException if {@code swallowIOException} is false and {@link Flushable#flush} throws
   *     an {@code IOException}.
   * @see Closeables#close
   */
  public static void flush(Flushable flushable, boolean swallowIOException) throws IOException {
    try {
      flushable.flush();
    } catch (IOException e) {
      if (swallowIOException) {

	} else {
		err = w.w.WriteByte('\n')
	}
	return err
}

// Flush writes any buffered data to the underlying [io.Writer].
// To check if an error occurred during Flush, call [Writer.Error].
func (w *Writer) Flush() {
	w.w.Flush()
}

// Error reports any error that has occurred during
// a previous [Writer.Write] or [Writer.Flush].
func (w *Writer) Error() error {
	_, err := w.w.Write(nil)
	return err
}

    {
        printf("cannot add vectored exception handler\n");
        fflush(stdout);
        return 2;
    }
    void *continueHandlerHandle = AddVectoredContinueHandler(0, customContinueHandlder);
    if (NULL == continueHandlerHandle)
    {
        printf("cannot add vectored continue handler\n");
        fflush(stdout);
        return 2;
    }

        renderer.onOutput(start(id: 3, parentId: null, status: ":bar"))
        renderer.onOutput(updateNow())
        console.flush()

        then:
        progressArea.display == ["> :foo"]

        and:
        renderer.onOutput(complete(2))
        renderer.onOutput(updateNow())
        console.flush()

        then:
        progressArea.display == ["> :bar"]
    }

        10_000 * listener.onOutput(_)
    }

    def "background flush does nothing when events already flushed"() {
        def event1 = event('1')
        def event2 = event('2')
        def flush = new FlushOutputEvent()

        given:
        renderer.onOutput(event1)
        renderer.onOutput(event2)
        renderer.onOutput(flush)

        when:
        executor.runFixedScheduledActionsNow()

}

type rwUnwrapper interface {
	Unwrap() ResponseWriter
}

// Flush flushes buffered data to the client.
func (c *ResponseController) Flush() error {
	rw := c.rw
	for {
		switch t := rw.(type) {
		case interface{ FlushError() error }:
			return t.FlushError()
		case Flusher:
			t.Flush()
			return nil
		case rwUnwrapper:
			rw = t.Unwrap()
		default:
			return errNotSupported()

    def "can encode and decode an empty stream"() {
        def outputStream = new ByteArrayOutputStream()
        def encoder = new EncodedStream.EncodedOutput(outputStream)

        when:
        encoder.flush()

        then:
        def inputStream = new ByteArrayInputStream(outputStream.toByteArray())
        def decoder = new EncodedStream.EncodedInput(inputStream)
        decoder.read() < 0
    }

        cacheAccessWorker.flush()

        then:
        counter == 3

        cleanup:
        cacheAccessWorker?.stop()
    }

    def "flush rethrows action failure"() {
        def failure = new RuntimeException()
        cacheAccessWorker.enqueue { throw failure }

        when:
        start(cacheAccessWorker)
        cacheAccessWorker.flush()

        then:

        then:
        1 * target.execute(listener)
        1 * loggingOutput.flush()
        0 * _._
    }

    def "reports exception thrown by Action"() {
        def failure = new RuntimeException()

        when:
        action.execute(listener)

        then:
        1 * target.execute(listener) >> { throw failure }
        1 * loggingOutput.flush()
        1 * reporter.execute(failure)