private var closed = false

      override fun close() {
        if (closed) return
        try {
          super.close()
        } finally {
          closedLatch.countDown()
        }
      }
    }.buffer()

  override val sink: BufferedSink =
    object : ForwardingSink(delegate.sink) {
      private var closed = false

      override fun close() {

    ) {
      check(!closed) { "closed" }
      checkOffsetAndCount(source.size, 0, byteCount)
      socket.sink.write(source, byteCount)
    }

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

    override fun close() {
      if (closed) return
      closed = true
      detachTimeout(timeout)

    val relay = edit(file, upstream, metadata, 1024)
    val source1 = relay.newSource()
    val source2 = relay.newSource()
    source1!!.close()
    source1.close() // Unnecessary. Shouldn't decrement the reference count.
    assertThat(relay.isClosed).isFalse()
    source2!!.close()
    assertThat(relay.isClosed).isTrue()
    assertFile(Relay.PREFIX_DIRTY, -1L, -1, null, null)
  }

  @Test
  fun racingReaders() {

    }

    // close() should close underlying handle with 0L when valid
    @Test
    @DisplayName("close() closes underlying handle when valid")
    void close_validHandle_invokesClose() throws Exception {
        when(handle.isValid()).thenReturn(true);
        SmbWatchHandleImpl sut = new SmbWatchHandleImpl(handle, 0, false);

        sut.close();

        verify(handle, times(1)).close(0L);

        assertEquals("one", it.next().getName()); // consume initial
        // Next call should handle CIFSException and close iterator
        assertFalse(it.hasNext()); // After error, hasNext should return false

        // Assert
        verify(tree, times(1)).release();
    }

    @Test
    @DisplayName("close() closes when there is a next element and releases handle")
    void explicitClose() throws Exception {
        // Arrange

        // Close should have sent FindClose2 exactly once
        ArgumentCaptor<SmbComFindClose2> captor = ArgumentCaptor.forClass(SmbComFindClose2.class);
        verify(tree, times(1)).send(captor.capture(), any());
        assertNotNull(captor.getValue());

        // Tree handle is released after close
        verify(tree, atLeastOnce()).release();
    }

    @Test

 * must close this body by calling any of the following methods:
 *
 * * `Response.close()`
 * * `Response.body().close()`
 * * `Response.body().source().close()`
 * * `Response.body().charStream().close()`
 * * `Response.body().byteStream().close()`
 * * `Response.body().bytes()`
 * * `Response.body().string()`
 *
 * There is no benefit to invoking multiple `close()` methods for the same response body.
 *

      if (civilizedFileSystem) return fileSource

      lockingSourceCount++
      return object : ForwardingSource(fileSource) {
        private var closed = false

        override fun close() {
          super.close()
          if (!closed) {
            closed = true
            synchronized(this@DiskLruCache) {
              lockingSourceCount--
              if (lockingSourceCount == 0 && zombie) {

  /**
   * Closes the response body. Equivalent to `body().close()`.
   *
   * Prior to OkHttp 5.0, it was an error to close a response that is not eligible for a body. This
   * includes the responses returned from [cacheResponse], [networkResponse], and [priorResponse].
   */
  override fun close() {
    body.close()
  }

        @DisplayName("close() closes handle; does not close file when not unshared")
        void closeClosesHandle() throws Exception {
            SmbFileInputStream in = newStream();
            in.close();
            verify(mockHandle, times(1)).close();
            verify(mockFile, never()).close();
        }

        @Test
        @DisplayName("seToIoe maps Interrupted cause to InterruptedIOException")