new UncaughtExceptionHandler() {
          @Override
          public void uncaughtException(Thread t, Throwable e) {}
        });
    thread.start();

    boolean done = doneSignal.await(1, SECONDS);
    if (!done) {
      StringBuilder builder = new StringBuilder();
      for (StackTraceElement trace : thread.getStackTrace()) {
        builder.append("\tat ").append(trace).append('\n');
      }

	# Start Daemon
	start-stop-daemon -d $FESS_HOME --start -b --user "$FESS_USER" -c "$FESS_USER" --pidfile "$PID_FILE" --exec $DAEMON -- $DAEMON_OPTS
	return=$?
	if [ $return -eq 0 ]; then
		i=0
		timeout=10
		# Wait for the process to be properly started before exiting
		until { kill -0 `cat "$PID_FILE"`; } >/dev/null 2>&1
		do
			sleep 1
			i=$(($i + 1))
			if [ $i -gt $timeout ]; then
				log_end_msg 1
				exit 1

                logger.error("Failed to update suggest index.", t);
                exitCode.set(1);
                latch.countDown();
            });

            try {
                latch.await();
            } catch (final InterruptedException ignore) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Interrupted.", ignore);
                }
                exitCode.set(1);

                } finally {
                    latch.countDown();
                }
            });
        }

        assertTrue(latch.await(10, TimeUnit.SECONDS));
        executor.shutdown();
    }

    @Test
    @DisplayName("Test invalid session ID handling")
    public void testInvalidSessionIdHandling() {

			}
		}
	}()

	return objs, nil
}

// Close and release resources.
func (w *metacacheWriter) Close() error {
	if w == nil || w.closer == nil {
		return nil
	}
	w.streamWg.Wait()
	err := w.closer()
	w.closer = nil
	return err
}

// Reset and start writing to new writer.
// Close must have been called before this.
func (w *metacacheWriter) Reset(out io.Writer) {

    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>Hoặc sử dụng <code>async def</code>...</summary>

Nếu code của bạn sử dụng `async` / `await`, hãy sử dụng `async def`:

```Python hl_lines="9  14"
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def read_root():

      }
    }
  }

  /**
   * Cleans up the given reference and any other references already in the queue. Catches and logs
   * all throwables.
   *
   * @return true if the caller should continue to wait for more references to be added to the
   *     queue, false if the associated FinalizableReferenceQueue is no longer referenced.
   */
  private boolean cleanUp(Reference<?> firstReference) {

    /**
     * Function code to peek at named pipe data without removing it
     */
    public static final int FSCTL_PIPE_PEEK = 0x0011400C;
    /**
     * Function code to wait for a named pipe to become available
     */
    public static final int FSCTL_PIPE_WAIT = 0x00110018;
    /**
     * Function code to transceive data on a named pipe
     */

pkg testing/fstest, method (MapFS) ReadLink(string) (string, error) #49580
pkg testing/synctest, func Test(*testing.T, func(*testing.T)) #67434
pkg testing/synctest, func Wait() #67434
pkg unicode, var CategoryAliases map[string]string #70780
pkg unicode, var Cn *RangeTable #70780

In this case, the task function will write to a file (simulating sending an email).

And as the write operation doesn't use `async` and `await`, we define the function with normal `def`:

{* ../../docs_src/background_tasks/tutorial001.py hl[6:9] *}

## Add the background task { #add-the-background-task }