Pode ser uma função `async def` ou `def` normal, o **FastAPI** saberá como lidar com isso corretamente.

Nesse caso, a função de tarefa gravará em um arquivo (simulando o envio de um e-mail).

E como a operação de gravação não usa `async` e `await`, definimos a função com `def` normal:

```Python hl_lines="6-9"
{!../../docs_src/background_tasks/tutorial001.py!}
```

## Adicionar a tarefa em segundo plano

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.smb1.smb1;

class SmbComBlankResponse extends ServerMessageBlock {

    SmbComBlankResponse() {
    }

    int writeParameterWordsWireFormat( byte[] dst, int dstIndex ) {

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.smb1.smb1;

class SmbComTreeDisconnect extends ServerMessageBlock {

    SmbComTreeDisconnect() {
        command = SMB_COM_TREE_DISCONNECT;
    }

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.smb;


import java.net.MalformedURLException;

import jcifs.CloseableIterator;
import jcifs.ResourceFilter;
import jcifs.SmbConstants;
import jcifs.SmbResource;

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs;


/**
 * Opaque reference to a SMB session
 * 
 * @author mbechler
 * @internal
 */
public interface SmbSession extends AutoCloseable {

    /**
     * {@inheritDoc}

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.dcerpc.ndr;


@SuppressWarnings ( "javadoc" )
public class NdrHyper extends NdrObject {

    public long value;


    public NdrHyper ( long value ) {

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.dcerpc.ndr;


@SuppressWarnings ( "javadoc" )
public class NdrLong extends NdrObject {

    public int value;


    public NdrLong ( int value ) {
        this.value = value;

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.dcerpc.ndr;


@SuppressWarnings ( "javadoc" )
public class NdrSmall extends NdrObject {

    public int value;


    public NdrSmall ( int value ) {

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.http;


import java.security.Principal;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.smb;


import jcifs.CIFSException;
import jcifs.DfsReferralData;
import jcifs.SmbResourceLocator;


/**
 * @author mbechler
 *
 */