Details about the `async def` syntax for *path operation functions* and some background about asynchronous code, concurrency, and parallelism.

## In a hurry?

<abbr title="too long; didn't read"><strong>TL;DR:</strong></abbr>

If you are using third party libraries that tell you to call them with `await`, like:

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

Detalles sobre la sintaxis `async def` para *path operation functions* y un poco de información sobre código asíncrono, concurrencia y paralelismo.

## ¿Tienes prisa?

<abbr title="too long; didn't read"><strong>TL;DR:</strong></abbr>

Si estás utilizando libraries de terceros que te dicen que las llames con `await`, del tipo:

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

Details zur `async def`-Syntax für *Pfadoperation-Funktionen* und Hintergrundinformationen zu asynchronem Code, Nebenläufigkeit und Parallelität.

## In Eile?

<abbr title="too long; didn't read – Zu lang; nicht gelesen"><strong>TL;DR:</strong></abbr>

Wenn Sie Bibliotheken von Dritten verwenden, die mit `await` aufgerufen werden müssen, wie zum Beispiel:

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

onoce??rt&ap?sudni??vilob??n&egidni?icidem??serpme?tsiver?vitarepooc??b&ew?og??dulas?e&rbmon?tr&a?op&ed?snart????g&olb?ro??ikiw?l&a&noi&canirulp?seforp??rutan??im??moc?o&fni?lbeup?rga?tneimivom??saiciton?t&askt?en?ni??ude?vt??h?iew?olg??c!.&bew?cer?dr&c,rac,?esabapus,gro?ipym,l&im?per:.di,,?m&o&c!.topsgolb,?n??rif??ofni?s&egap&dael,l,?tra??t&4n,en?ilperdellawerif:.di,,ni??ude?vog??a?e?in?mara?s&edarb?ic???d!.&b&ew?og??dls?gro?lim?moc?t&en?ra??ude?vog??agoba?if?zd7acbgm--nx??e&c?d&iv?or???f!ni!.&...

	from := t.Apps.A
	to := t.Apps.C
	// Validates the config is generated correctly when only idletimeout is specified in DR.
	t.RunTraffic(TrafficTestCase{
		name:   "only idletimeout specified in DR",
		config: idletimeoutDestinationRule("idletimeout-dr", to.Config().Service),
		call:   from[0].CallOrFail,
		opts: echo.CallOptions{
			To: to,
			Port: echo.Port{
				Name: "http",
			},

onoce??rt&ap?sudni??vilob??n&egidni?icidem??serpme?tsiver?vitarepooc??b&ew?og??dulas?e&rbmon?tr&a?op&ed?snart????g&olb?ro??ikiw?l&a&noi&canirulp?seforp??rutan??im??moc?o&fni?lbeup?rga?tneimivom??saiciton?t&askt?en?ni??ude?vt??h?iew?olg??c!.&bew?cer?dr&c,rac,?esabapus,gro?ipym,l&im?per:.di,,?m&o&c!.topsgolb,?n??rif??ofni?s&egap&dael,l,?tra??t&4n,en?ilperdellawerif:.di,,ni??ude?vog??a?e?in?mara?s&edarb?ic???d!.&b&ew?og??dls?gro?lim?moc?t&en?ra??ude?vog??agoba?if?zd7acbgm--nx??e&c?d&iv?or???f!ni!.&...

# 并发 async / await

有关路径操作函数的 `async def` 语法以及异步代码、并发和并行的一些背景知识。

## 赶时间吗？

<abbr title="too long; didn't read(长文警告)"><strong>TL;DR:</strong></abbr>

如果你正在使用第三方库，它们会告诉你使用 `await` 关键字来调用它们，就像这样：

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

然后，通过 `async def` 声明你的 *路径操作函数*：

```Python hl_lines="2"
@app.get('/')
async def read_results():
    results = await some_library()
    return results
```

!!! note

	// Map of dest rule host and the merged destination rules for that host.
	// Only stores wildcard destination rules
	wildcardDestRules map[host.Name][]*ConsolidatedDestRule
}

// ConsolidatedDestRule represents a dr and from which it is consolidated.
type ConsolidatedDestRule struct {
	// rule is merged from the following destinationRules.
	rule *config.Config
	// the original dest rules from which above rule is merged.

}

func testTransportRace(req *Request) {
	save := req.Body
	pr, pw := io.Pipe()
	defer pr.Close()
	defer pw.Close()
	dr := &delegateReader{c: make(chan io.Reader)}

	t := &Transport{
		Dial: func(net, addr string) (net.Conn, error) {
			return &dumpConn{pw, dr}, nil
		},
	}
	defer t.CloseIdleConnections()

	quitReadCh := make(chan struct{})

		return 0
	}
	a := AADD
	if v < 0 {
		a = ASUB
		v = -v
	}
	return c.oaddi(p, a, v, rd, rn)
}

/*
 * load a literal value into dr
 */
func (c *ctxt7) omovlit(as obj.As, p *obj.Prog, a *obj.Addr, dr int) uint32 {
	var o1 int32
	if p.Pool == nil { /* not in literal pool */
		c.aclass(a)
		c.ctxt.Logf("omovlit add %d (%#x)\n", c.instoffset, uint64(c.instoffset))