# 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

          t: Throwable,
          response: Response?,
        ) {
          t.printStackTrace(System.out)
          latch.countDown()
        }
      },
    )

    check(latch.await(30, TimeUnit.SECONDS)) { "Timed out waiting for test $number to finish." }
    val endNanos = System.nanoTime()
    val tookMs = TimeUnit.NANOSECONDS.toMillis(endNanos - startNanos.get())
    println("Took ${tookMs}ms")
  }

    assertEquals(3L, countDownLatch.getCount());

    list.execute();

    // Verify that all of the runnables execute in a reasonable amount of time.
    assertTrue(countDownLatch.await(1L, SECONDS));
  }

  public void testExecute_idempotent() {
    AtomicInteger runCalled = new AtomicInteger();
    list.add(
        new Runnable() {
          @Override
          public void run() {

        return inner

    async def __call__(self, scope, receive, send):
        if scope["type"] != "http" or self.max_content_size is None:
            await self.app(scope, receive, send)
            return

        wrapper = self.receive_wrapper(receive)
        await self.app(scope, wrapper, send)


@router.post("/middleware")
def run_middleware(file: UploadFile = File(..., description="Big File")):

    assertTrue(latch.await(5, SECONDS));
    assertTrue(future.isDone());
    assertFalse(future.isCancelled());

    assertEquals(expectedValue, future.get());
  }

  public void testCancelledFuture() throws InterruptedException, ExecutionException {
    assertTrue(future.isDone());
    assertTrue(future.isCancelled());

    assertTrue(latch.await(5, SECONDS));
    assertTrue(future.isDone());

            )
            text(
                "reverse.dep.*.additional.gradle.parameters",
                "",
                display = ParameterDisplay.NORMAL,
                allowEmpty = true,
                description =
                    "The extra gradle parameters you want to pass to all dependencies of this build, " +

			if tc.expectedFlag != actualFlag {
				t.Errorf("test: %s, got flag: %v, want: %v", tc.name, actualFlag, tc.expectedFlag)
			}
			if tc.expectedCode != recorder.Code {
				t.Errorf("test: %s, got code: %d, want: %d", tc.name, recorder.Code, tc.expectedCode)
			}
		})
	}
	testCases = []struct {
		name              string
		ifMatch           string

	}
	now := time.Date(2025, time.February, 10, 23, 0, 0, 0, time.UTC)
	gotEvents := evaluator.eval(objs, now)
	for i := range wantEvents {
		if gotEvents[i].Action != wantEvents[i].Action {
			t.Fatalf("got %v, want %v", gotEvents[i], wantEvents[i])
		}
	}

	lc = prepLifecycleCfg([]string{"tag3", "tag4", "tag5"}, []int{1, 2, 3})
	objs = objs[:len(objs)-1]
	wantEvents = []Event{
		{Action: NoneAction},
		{Action: NoneAction},

				err = rec.WriteJSON(&gotB)
				if err != nil {
					t.Error(err)
				}
				err = want.WriteJSON(&wantB)
				if err != nil {
					t.Error(err)
				}
				// truncate newline from 'want'
				wantB.Truncate(wantB.Len() - 1)
				if !bytes.Equal(gotB.Bytes(), wantB.Bytes()) {
					t.Errorf("JSON output mismatch.\nwant: %s\ngot:  %s", wantB.String(), gotB.String())
				}
			}
		})
	}

```bash
helm get values my-release > old_values.yaml
```

Then change the field `image.tag` in `old_values.yaml` file with MinIO image tag you want to use. Now update the chart using

```bash
helm upgrade -f old_values.yaml my-release minio/minio
```