# 並行処理と async / await

*path operation 関数*のための `async def` に関する詳細と非同期 (asynchronous) コード、並行処理 (Concurrency)、そして、並列処理 (Parallelism) の背景について。

## 急いでいますか？

<abbr title="too long; didn't read (長すぎて読めない人のための要約という意味のスラング)"><strong>TL;DR:</strong></abbr>

次のような、`await` を使用して呼び出すべきサードパーティライブラリを使用している場合:

```Python
results = await some_library()
```

以下の様に `async def` を使用して*path operation 関数*を宣言します。

```Python hl_lines="2"
@app.get('/')

	LEAW (BX), R11                          // 66448d1b
	LEAW (R11), R11                         // 66458d1b
	LEAL (BX), DX                           // 8d13
	LEAL (R11), DX                          // 418d13
	LEAL (BX), R11                          // 448d1b
	LEAL (R11), R11                         // 458d1b
	LEAQ (BX), DX                           // 488d13
	LEAQ (R11), DX                          // 498d13

-intro/) that offers additional functionality like `At-least-once-delivery`, and `Publisher rate limiting`. To configure MinIO server to send notifications to NATS Streaming server, update the MinIO server configuration file as follows:

Read more about sections `cluster_id`, `client_id` on [NATS documentation](https://github.com/nats-io/nats-streaming-server/blob/master/README.md). Section `maxPubAcksInflight` is explained [here](https://github.com/nats-io/stan.go#publisher-rate-limiting)....

	} else {
		c.iamUsersMap[key] = u
	}
	c.updatedAt = time.Now()
	return nil
}

// IAMStorageAPI defines an interface for the IAM persistence layer
type IAMStorageAPI interface {
	// The role of the read-write lock is to prevent go routines from
	// concurrently reading and writing the IAM storage. The (r)lock()
	// functions return the iamCache. The cache can be safely written to
	// only when returned by `lock()`.

pkg crypto/cipher, type AEAD interface { NonceSize, Open, Overhead, Seal }
pkg crypto/cipher, type AEAD interface, NonceSize() int
pkg crypto/cipher, type AEAD interface, Open([]uint8, []uint8, []uint8, []uint8) ([]uint8, error)
pkg crypto/cipher, type AEAD interface, Overhead() int
pkg crypto/cipher, type AEAD interface, Seal([]uint8, []uint8, []uint8, []uint8) []uint8
pkg crypto/md5, func Sum([]uint8) [16]uint8

pkg io, method (*OffsetWriter) WriteAt([]uint8, int64) (int, error) #45899
pkg io, method (*OffsetWriter) Write([]uint8) (int, error) #45899
pkg io, type OffsetWriter struct #45899
pkg math/rand, func Read //deprecated #20661
pkg math/rand, func Seed //deprecated #56319
pkg net, const FlagRunning = 32 #53482
pkg net, const FlagRunning Flags #53482

pkg syscall (freebsd-arm64), func RawSyscall6(uintptr, uintptr, uintptr, uintptr, uintptr, uintptr, uintptr) (uintptr, uintptr, Errno)
pkg syscall (freebsd-arm64), func Read(int, []uint8) (int, error)
pkg syscall (freebsd-arm64), func ReadDirent(int, []uint8) (int, error)
pkg syscall (freebsd-arm64), func Recvfrom(int, []uint8, int) (int, Sockaddr, error)

pkg syscall (netbsd-arm64-cgo), func RawSyscall(uintptr, uintptr, uintptr, uintptr) (uintptr, uintptr, Errno)
pkg syscall (netbsd-arm64-cgo), func ReadDirent(int, []uint8) (int, error)
pkg syscall (netbsd-arm64-cgo), func Read(int, []uint8) (int, error)
pkg syscall (netbsd-arm64-cgo), func Recvfrom(int, []uint8, int) (int, Sockaddr, error)
pkg syscall (netbsd-arm64-cgo), func Recvmsg(int, []uint8, []uint8, int) (int, int, int, Sockaddr, error)