RdmaMemoryRegion region;

        while ((region = availableSendRegions.poll()) != null) {
            region.close();
            totalReleased.incrementAndGet();
        }

        while ((region = availableReceiveRegions.poll()) != null) {
            region.close();
            totalReleased.incrementAndGet();
        }

        return watch();
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.SmbWatchHandle#close()
     */
    @Override
    public void close() throws CIFSException {
        if (this.handle.isValid()) {
            this.handle.close(0L);
        }
    }

    @Test
    @DisplayName("Test multiple close calls on managed resource")
    void testMultipleCloseOnManagedResource() throws Exception {
        TestResource resource = new TestResource("multiclose");
        ResourceManager.ManagedResource<TestResource> managed = resourceManager.manage(resource);

        managed.close();
        assertTrue(resource.isClosed());

        // Second close should not throw

import jcifs.dcerpc.rpc.policy_handle;

/**
 * Microsoft RPC SAM close handle request.
 * This class implements the SAMR close handle operation.
 *
 * @author mbechler
 */
public class MsrpcSamrCloseHandle extends samr.SamrCloseHandle {

    /**
     * Creates a new request to close a SAM handle.
     *
     * @param handle the policy handle to close
     */
    public MsrpcSamrCloseHandle(final policy_handle handle) {

                  return true;
                }
                return false;
              }
            },
            isParallel)
        .onClose(streamA::close)
        .onClose(streamB::close);
  }

  /**
   * Invokes {@code consumer} once for each pair of <i>corresponding</i> elements in {@code streamA}

        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 {

        assertTrue(output.contains("42"));
        assertTrue(output.contains("true"));

        // Test close
        logStream.close();
        // After close, the stream should not accept more writes
        // but PrintStream doesn't throw exceptions on write after close
    }

    @Test
    void testConcurrentAccess() throws InterruptedException {
        // Test thread safety of getInstance

        ) {
          webSocket.send(text)
        }

        override fun onClosing(
          webSocket: WebSocket,
          code: Int,
          reason: String,
        ) {
          webSocket.close(1000, null)
          latch.countDown()
        }

        override fun onFailure(
          webSocket: WebSocket,
          t: Throwable,
          response: Response?,
        ) {

                  }
                },
              ).build()
          }
        }
      if ("close".equals(response.request.header("Connection"), ignoreCase = true) ||
        "close".equals(response.header("Connection"), ignoreCase = true)
      ) {
        exchange.noNewExchangesOnConnection()
      }

    }

    @Test
    @DisplayName("close does nothing and does not touch handle")
    void close_doesNothing() throws Exception {
        // Arrange
        SmbPipeOutputStream out = newStream();
        // constructor already calls handle.getPipe(); clear interactions to focus on close()
        clearInvocations(handle);

        // Act
        out.close();

        // Assert