if (queue.futureTasks.isEmpty()) {
        readyQueues.removeAt(i)
      }
    }
  }

  interface Backend {
    fun nanoTime(): Long

    fun coordinatorNotify(taskRunner: TaskRunner)

    fun coordinatorWait(
      taskRunner: TaskRunner,
      nanos: Long,
    )

    fun <T> decorate(queue: BlockingQueue<T>): BlockingQueue<T>

    fun execute(
      taskRunner: TaskRunner,

                  startNextTask()
                }
              }
            }
        }

        override fun coordinatorWait(
          taskRunner: TaskRunner,
          nanos: Long,
        ) {
          taskRunner.assertThreadHoldsLock()
          check(waitingCoordinatorTask == null)
          if (nanos == 0L) return

          // Yield until notified, interrupted, or the duration elapses.

   * To differentiate the two cases we ping the server when a stream times out. If the overall
   * connection is fine the ping will receive a pong; otherwise it won't.
   *
   * The deadline to respond to this ping attempts to limit the cost of being wrong. If it is too
   * long, streams created while we await the pong will reuse broken connections and inevitably
   * fail. If it is too short, slow connections will be marked as failed and extra TCP and TLS

- CLI client. This is the `gradle` or `gradlew` command, and is responsible for locating, starting and interacting with the Gradle daemon, potentially downloading the Gradle distribution. 
- Tooling API client. This a library that is embedded into applications, such as IDEs or CI agents, that allows them to act as a Gradle client.

   */
  private val maxIdleConnections: Int,
  keepAliveDuration: Long,
  timeUnit: TimeUnit,
  internal val connectionListener: ConnectionListener,
  private val exchangeFinderFactory: (RealConnectionPool, Address, ConnectionUser) -> ExchangeFinder,
) {
  internal val keepAliveDurationNs: Long = timeUnit.toNanos(keepAliveDuration)

  @Volatile

      }

      var minFreshMillis: Long = 0
      if (requestCaching.minFreshSeconds != -1) {
        minFreshMillis = SECONDS.toMillis(requestCaching.minFreshSeconds.toLong())
      }

      var maxStaleMillis: Long = 0
      if (!responseCaching.mustRevalidate && requestCaching.maxStaleSeconds != -1) {

    /** True if the caller has closed this stream. */
    internal var closed: Boolean = false

    @Throws(IOException::class)
    override fun read(
      sink: Buffer,
      byteCount: Long,
    ): Long {
      require(byteCount >= 0L) { "byteCount < 0: $byteCount" }

      while (true) {
        var tryAgain = false
        var readBytesDelivered = -1L

internal class UnreadableResponseBody(
  private val mediaType: MediaType?,
  private val contentLength: Long,
) : ResponseBody(), Source {
  override fun contentType() = mediaType

  override fun contentLength() = contentLength

  override fun source() = buffer()

  override fun read(
    sink: Buffer,
    byteCount: Long,
  ): Long {
    throw IllegalStateException(
      """

# Concurrency and async / await

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()
```

   * connection if `streamId` is zero.
   */
  @Throws(IOException::class)
  fun windowUpdate(
    streamId: Int,
    windowSizeIncrement: Long,
  ) {
    this.withLock {
      if (closed) throw IOException("closed")
      require(windowSizeIncrement != 0L && windowSizeIncrement <= 0x7fffffffL) {