### Concurrent Burgers

You go with your crush to get fast food, you stand in line while the cashier takes the orders from the people in front of you. 😍

<img src="/img/async/concurrent-burgers/concurrent-burgers-01.png" class="illustration">

Then it's your turn, you place your order of 2 very fancy burgers for your crush and you. 🍔🍔

### Concurrence et Burgers

L'idée de code **asynchrone** décrite ci-dessus est parfois aussi appelée **"concurrence"**. Ce qui est différent du **"parallélisme"**.

La **concurrence** et le **parallélisme** sont tous deux liés à l'idée de "différentes choses arrivant plus ou moins au même moment".

Mais les détails entre la **concurrence** et le **parallélisme** diffèrent sur de nombreux points.

<img src="https://fastapi.tiangolo.com/img/async/concurrent-burgers/concurrent-burgers-02.png" alt="illustration">

El cajero 💁 le dice algo al chico de la cocina 👨‍🍳 para que sepa que tiene que preparar tus hamburguesas 🍔 (a pesar de que actualmente está preparando las de los clientes anteriores).

<img src="https://fastapi.tiangolo.com/img/async/concurrent-burgers/concurrent-burgers-03.png" alt="illustration">

Pagas 💸.

<img src="/img/async/concurrent-burgers/concurrent-burgers-01.png" class="illustration">

Dann sind Sie an der Reihe und Sie bestellen zwei sehr schmackhafte Burger für Ihren Schwarm und Sie. 🍔🍔

<img src="/img/async/concurrent-burgers/concurrent-burgers-02.png" class="illustration">

你和你的恋人一起去快餐店，你排队在后面，收银员从你前面的人接单。😍

<img src="/img/async/concurrent-burgers/concurrent-burgers-01.png" class="illustration">

然后轮到你了，你为你的恋人和你选了两个非常豪华的汉堡。🍔🍔

<img src="/img/async/concurrent-burgers/concurrent-burgers-02.png" class="illustration">

收银员对厨房里的厨师说了一些话，让他们知道他们必须为你准备汉堡（尽管他们目前正在为之前的顾客准备汉堡）。

<img src="/img/async/concurrent-burgers/concurrent-burgers-03.png" class="illustration">

你付钱了。 💸

收银员给你轮到的号码。

<img src="/img/async/concurrent-burgers/concurrent-burgers-01.png" class="illustration">

⤴️ ⚫️ 👆 🔄, 👆 🥉 👆 ✔ 2️⃣ 📶 🎀 🍔 👆 🥰 &amp; 👆. 👶 👶

<img src="/img/async/concurrent-burgers/concurrent-burgers-02.png" class="illustration">

🏧 💬 🕳 🍳 👨‍🍳 👫 💭 👫 ✔️ 🏗 👆 🍔 (✋️ 👫 ⏳ 🏗 🕐 ⏮️ 👩‍💻).

<img src="/img/async/concurrent-burgers/concurrent-burgers-03.png" class="illustration">

👆 💸. 👶

    !!! tip
        By adding the `standard`, Uvicorn will install and use some recommended extra dependencies.

        That including `uvloop`, the high-performance drop-in replacement for `asyncio`, that provides the big concurrency performance boost.

        When you install FastAPI with something like `pip install fastapi` you already get `uvicorn[standard]` as well.

=== "Hypercorn"

    But context variables are aware of these async features, so, a Peewee database state set in the `async` dependency `reset_db_state()` will keep its own data throughout the entire request.

    And at the same time, the other concurrent request will have its own database state that will be independent for the whole request.

#### Peewee Proxy

    "pydantic-settings >=2.0.0",
    # Extra Pydantic data types
    "pydantic-extra-types >=2.0.0",
]

[tool.mypy]
strict = true

[[tool.mypy.overrides]]
module = "fastapi.concurrency"
warn_unused_ignores = false
ignore_missing_imports = true

[[tool.mypy.overrides]]
module = "fastapi.tests.*"
ignore_missing_imports = true
check_untyped_defs = true

[[tool.mypy.overrides]]

* ✨ Add illustrations for Concurrent burgers and Parallel burgers. PR [#5277](https://github.com/tiangolo/fastapi/pull/5277) by [@tiangolo](https://github.com/tiangolo). Updated docs at: [Concurrency and Burgers](https://fastapi.tiangolo.com/async/#concurrency-and-burgers).

### Translations