}

      val now = backend.nanoTime()
      var minDelayNanos = Long.MAX_VALUE
      var readyTask: Task? = null
      var multipleReadyTasks = false

      // Decide what to run. This loop's goal wants to:
      //  * Find out what this thread should do (either run a task or sleep)
      //  * Find out if there's enough work to start another thread.
      eachQueue@ for (queue in readyQueues) {

    useSiteSession: FirSession,
    annotationContainer: FirAnnotationContainer = firSymbol.fir,
): Boolean {
    return if (firSymbol.isFromCompilerRequiredAnnotationsPhase(classId, useSiteSession)) {
        // this loop by index is required to avoid possible ConcurrentModificationException
        val annotations = annotationContainer.resolvedCompilerRequiredAnnotations(firSymbol)
        for (index in annotations.indices) {

   * simultaneously adopted and removed.
   */
  private val connections = ConcurrentLinkedQueue<RealConnection>()

  init {
    // Put a floor on the keep alive duration, otherwise cleanup will spin loop.
    require(keepAliveDuration > 0L) { "keepAliveDuration <= 0: $keepAliveDuration" }
  }

  fun idleConnectionCount(): Int {
    return connections.count {
      it.withLock { it.calls.isEmpty() }
    }
  }

]
xfail_strict = true
junit_family = "xunit2"
filterwarnings = [
    "error",
    # TODO: needed by asyncio in Python 3.9.7 https://bugs.python.org/issue45097, try to remove on 3.9.8
    'ignore:The loop argument is deprecated since Python 3\.8, and scheduled for removal in Python 3\.10:DeprecationWarning:asyncio',
    'ignore:starlette.middleware.wsgi is deprecated and will be removed in a future release\..*:DeprecationWarning:starlette',

            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.BREAK_OR_CONTINUE_OUTSIDE_A_LOOP) { firDiagnostic ->
        BreakOrContinueOutsideALoopImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.NOT_A_LOOP_LABEL) { firDiagnostic ->
        NotALoopLabelImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,

 *  Fix: Don't crash after a web socket fails its connection upgrade. We incorrectly released
    the web socket's connections back to the pool before their resources were cleaned up.

 *  Fix: Don't infinite loop when a received web socket message has self-terminating compressed
    data.

 *  Fix: Don't fail the call when the response code is ‘HTTP 102 Processing’ or ‘HTTP 103 Early
    Hints’.

## Known Caveats

*   TF Core:
    *   A longstanding bug in `tf.while_loop`, which caused it to execute
        sequentially, even when `parallel_iterations>1`, has now been fixed.
        However, the increased parallelism may result in increased memory use.
        Users who experience unwanted regressions should reset their
        `while_loop`'s `parallel_iterations` value to 1, which is consistent
        with prior behavior.

!!! note "Technical Details"
    It used <a href="https://github.com/MagicStack/uvloop" class="external-link" target="_blank">`uvloop`</a> instead of the default Python `asyncio` loop. That's what made it so fast.

    It clearly inspired Uvicorn and Starlette, that are currently faster than Sanic in open benchmarks.

!!! check "Inspired **FastAPI** to"
    Find a way to have a crazy performance.

## 0.47.1

* Fix model filtering in `response_model`, cloning sub-models. PR [#889](https://github.com/tiangolo/fastapi/pull/889).
* Fix FastAPI serialization of Pydantic models using ORM mode blocking the event loop. PR [#888](https://github.com/tiangolo/fastapi/pull/888).

## 0.47.0