val index = serialTaskQueue.indexOfFirst { it.isReady() }
    if (index == -1) return null

    val nextTask = serialTaskQueue.removeAt(index)
    currentTask = nextTask
    contextSwitchCount++
    nextTask.start()
    return nextTask
  }

  private interface SerialTask {
    /** Returns true if this task is ready to start. */
    fun isReady() = true

{* ../../docs_src/security/tutorial002_an_py310.py hl[30:32] *}

## Recap { #recap }

You can now get the current user directly in your *path operation function*.

We are already halfway there.

We just need to add a *path operation* for the user/client to actually send the `username` and `password`.

# - - - - - - - - - -/
errors.login.failure = ログインに失敗しました。
errors.app.illegal.transition = 不正な遷移のため、再度実行してください。
errors.app.db.already.deleted = 他の処理で削除されている可能性があります。再度、操作をやり直してください。
errors.app.db.already.updated = 他の処理で更新されている可能性があります。再度、操作をやり直してください。
errors.app.db.already.exists = データがすでに存在しています。再度、操作をやり直してください。
errors.app.double.submit.request = このリクエストの前に処理されている場合があります。再度、操作をやり直してください。

# - - - - - - - - - -/
errors.login.failure = 로그인에 실패했습니다.
errors.app.illegal.transition = 잘못된 전환입니다. 다시 시도하십시오.
errors.app.db.already.deleted = 다른 프로세스에 의해 삭제되었을 수 있습니다. 다시 시도하십시오.
errors.app.db.already.updated = 다른 프로세스에 의해 업데이트되었을 수 있습니다. 다시 시도하십시오.
errors.app.db.already.exists = 데이터가 이미 존재합니다. 다시 시도하십시오.
errors.app.double.submit.request = 이 요청 전에 처리되었을 수 있습니다. 다시 시도하십시오.

   */
  public final void visit(@Nullable Type... types) {
    for (Type type : types) {
      if (type == null || !visited.add(type)) {
        // null owner type, or already visited;
        continue;
      }
      boolean succeeded = false;
      try {
        if (type instanceof TypeVariable) {
          visitTypeVariable((TypeVariable<?>) type);

const maxConsecutiveEmptyReads = 100

// NewReaderSize returns a new [Reader] whose buffer has at least the specified
// size. If the argument io.Reader is already a [Reader] with large enough
// size, it returns the underlying [Reader].
func NewReaderSize(rd io.Reader, size int) *Reader {
	// Is it already a Reader?
	b, ok := rd.(*Reader)
	if ok && len(b.buf) >= size {
		return b
	}
	r := new(Reader)

	"github.com/minio/pkg/v3/policy"
)

var (
	errRebalanceDecommissionAlreadyRunning = errors.New("Rebalance cannot be started, decommission is already in progress")
	errDecommissionRebalanceAlreadyRunning = errors.New("Decommission cannot be started, rebalance is already in progress")
)

func (a adminAPIHandlers) StartDecommission(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

### Return values { #return-values }

And they can return values or not, the values won't be used.

So, you can reuse a normal dependency (that returns a value) you already use somewhere else, and even though the value won't be used, the dependency will be executed:

{* ../../docs_src/dependencies/tutorial006_an_py39.py hl[11,16] *}

        } else // don't truncate the file
        if ((flags & SmbFile.O_CREAT) == SmbFile.O_CREAT) {
            // create it if necessary
            if ((flags & SmbFile.O_EXCL) == SmbFile.O_EXCL) {
                // fail if already exists
                openFunction = OPEN_FN_CREATE | OPEN_FN_FAIL_IF_EXISTS;
            } else {
                openFunction = OPEN_FN_CREATE | OPEN_FN_OPEN;
            }
        } else {

# About FastAPI versions { #about-fastapi-versions }

**FastAPI** is already being used in production in many applications and systems. And the test coverage is kept at 100%. But its development is still moving quickly.

New features are added frequently, bugs are fixed regularly, and the code is still continuously improving.