pkg syscall (darwin-arm64), const SYS_FSTAT_EXTENDED ideal-int
pkg syscall (darwin-arm64), const SYS_FSYNC = 95
pkg syscall (darwin-arm64), const SYS_FSYNC ideal-int
pkg syscall (darwin-arm64), const SYS_FSYNC_NOCANCEL = 408
pkg syscall (darwin-arm64), const SYS_FSYNC_NOCANCEL ideal-int
pkg syscall (darwin-arm64), const SYS_FTRUNCATE = 201
pkg syscall (darwin-arm64), const SYS_FTRUNCATE ideal-int

pkg syscall (freebsd-arm64), const MCL_FUTURE ideal-int
pkg syscall (freebsd-arm64), const MS_ASYNC = 1
pkg syscall (freebsd-arm64), const MS_ASYNC ideal-int
pkg syscall (freebsd-arm64), const MS_INVALIDATE = 2
pkg syscall (freebsd-arm64), const MS_INVALIDATE ideal-int
pkg syscall (freebsd-arm64), const MS_SYNC = 0
pkg syscall (freebsd-arm64), const MS_SYNC ideal-int
pkg syscall (freebsd-arm64), const MSG_CMSG_CLOEXEC = 262144

pkg syscall (freebsd-riscv64), const MS_ASYNC = 1 #53466
pkg syscall (freebsd-riscv64), const MS_ASYNC ideal-int #53466
pkg syscall (freebsd-riscv64), const MS_INVALIDATE = 2 #53466
pkg syscall (freebsd-riscv64), const MS_INVALIDATE ideal-int #53466
pkg syscall (freebsd-riscv64), const MS_SYNC = 0 #53466
pkg syscall (freebsd-riscv64), const MS_SYNC ideal-int #53466

```Python hl_lines="2-3"
@app.get('/burgers')
async def read_burgers():
    burgers = await get_burgers(2)
    return burgers
```

### More technical details

You might have noticed that `await` can only be used inside of functions defined with `async def`.

```Python hl_lines="2-3"
@app.get('/burgers')
async def read_burgers():
    burgers = await get_burgers(2)
    return burgers
```

### 더 세부적인 기술적 사항

`await`가 `async def`를 사용하는 함수 내부에서만 사용이 가능하다는 것을 눈치채셨을 것입니다.

하지만 동시에, `async def`로 정의된 함수들은 "대기"되어야만 합니다. 따라서, `async def`를 사용한 함수들은 역시 `async def`를 사용한 함수 내부에서만 호출될 수 있습니다.

`await` in yalnızca `async def` ile tanımlanan fonksıyonların içinde kullanılabileceğini fark etmişsinizdir.

Ama aynı zamanda, `async def` ile tanımlanan fonksiyonların "await" ile beklenmesi gerekir. Bu nedenle, "`async def` içeren fonksiyonlar yalnızca "`async def` ile tanımlanan fonksiyonların içinde çağrılabilir.


Yani yumurta mı tavukdan, tavuk mu yumurtadan gibi ilk `async` fonksiyonu nasıl çağırılır?

```Python hl_lines="7"
{!../../../docs_src/async_tests/test_main.py!}
```

!!! tip
    Note that the test function is now `async def` instead of just `def` as before when using the `TestClient`.

Then we can create an `AsyncClient` with the app, and send async requests to it, using `await`.

```Python hl_lines="9-10"
{!../../../docs_src/async_tests/test_main.py!}
```

This is the equivalent to:

```Python hl_lines="2 3"
@app.get('/burgers')
async def read_burgers():
    burgers = await get_burgers(2)
    return burgers
```

### Mais detalhes técnicos

Você deve ter observado que `await` pode ser usado somente dentro de funções definidas com `async def`.

Gleichzeitig müssen aber mit `async def` definierte Funktionen „erwartet“ („awaited“) werden. Daher können Funktionen mit `async def` nur innerhalb von Funktionen aufgerufen werden, die auch mit `async def` definiert sind.

Daraus resultiert das Ei-und-Huhn-Problem: Wie ruft man die erste `async` Funktion auf?

Vous avez donc compris que `await` peut seulement être utilisé dans des fonctions définies avec `async def`.

Mais en même temps, les fonctions définies avec `async def` doivent être appelées avec `await` et donc dans des fonctions définies elles aussi avec `async def`.

Vous avez donc remarqué ce paradoxe d'oeuf et de la poule, comment appelle-t-on la première fonction `async` ?