### Concurrencia y Hamburguesas { #concurrency-and-burgers }

Esta idea de código **asíncrono** descrita anteriormente a veces también se llama **"concurrencia"**. Es diferente del **"paralelismo"**.

**Concurrencia** y **paralelismo** ambos se relacionan con "diferentes cosas sucediendo más o menos al mismo tiempo".

Pero los detalles entre *concurrencia* y *paralelismo* son bastante diferentes.

Al añadir `standard`, Uvicorn instalará y usará algunas dependencias adicionales recomendadas.

Eso incluye `uvloop`, el reemplazo de alto rendimiento para `asyncio`, que proporciona un gran impulso de rendimiento en concurrencia.

Cuando instalas FastAPI con algo como `pip install "fastapi[standard]"` ya obtienes `uvicorn[standard]` también.

///

## Ejecuta el Programa del Servidor { #run-the-server-program }

* el header `Authorization`
* el header Forwarded

* el sistema de inyección de dependencias
* la dependencia
* el dependable
* el dependiente

* limitado por I/O
* limitado por CPU
* concurrencia
* paralelismo
* multiprocesamiento

* la variable de entorno
* la variable de entorno
* el `PATH`
* la variable `PATH`

* la autenticación
* el proveedor de autenticación

from typing import TypeVar

import anyio.to_thread
from anyio import CapacityLimiter
from starlette.concurrency import iterate_in_threadpool as iterate_in_threadpool  # noqa
from starlette.concurrency import run_in_threadpool as run_in_threadpool  # noqa
from starlette.concurrency import (  # noqa
    run_until_first_complete as run_until_first_complete,
)

_T = TypeVar("_T")


@asynccontextmanager

import org.jspecify.annotations.Nullable;

/**
 * A helper for concurrency testing. One or more {@code TestThread} instances are instantiated in a
 * test with reference to the same "lock-like object", and then their interactions with that object
 * are choreographed via the various methods on this class.
 *
 * <p>A "lock-like object" is really any object that may be used for concurrency control. If the

import org.jspecify.annotations.Nullable;

/**
 * A helper for concurrency testing. One or more {@code TestThread} instances are instantiated in a
 * test with reference to the same "lock-like object", and then their interactions with that object
 * are choreographed via the various methods on this class.
 *
 * <p>A "lock-like object" is really any object that may be used for concurrency control. If the

   * factor, and concurrency settings.
   */
  public static <E> ConcurrentHashMultiset<E> create() {
    return create(new ConcurrentHashMap<>());
  }

  /**
   * Creates a new {@code ConcurrentHashMultiset} containing the specified elements, using the
   * default initial capacity, load factor, and concurrency settings.
   *

    ]

[tool.tiangolo._internal-slim-build.packages.fastapi-slim.project]
name = "fastapi-slim"

[tool.mypy]
plugins = ["pydantic.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]]

name: Contributor CI Build

on:
  push:
    branches:
      - master
  pull_request:
    branches:
      - master

concurrency:
  # On master/release, we don't want any jobs cancelled so the sha is used to name the group
  group: ${{ (github.ref == 'refs/heads/master' || github.ref == 'refs/heads/release' ) && format('contributor-pr-base-{0}', github.sha) || format('contributor-pr-{0}', github.ref) }}
  cancel-in-progress: false

env:

import inspect
import sys
from collections.abc import AsyncGenerator, Generator
from functools import wraps

import pytest
from fastapi import Depends, FastAPI
from fastapi.concurrency import iterate_in_threadpool, run_in_threadpool
from fastapi.testclient import TestClient

if sys.version_info >= (3, 13):  # pragma: no cover
    from inspect import iscoroutinefunction
else:  # pragma: no cover
    from asyncio import iscoroutinefunction