* the request completes normally or when it fails due to an exception, in which case [e] should
   * be non-null.
   *
   * If the exchange was canceled or timed out, this will wrap [e] in an exception that provides
   * that additional context. Otherwise [e] is returned as-is.
   */
  internal fun <E : IOException?> messageDone(
    exchange: Exchange,
    requestDone: Boolean,

          ) as SSLSocket

        val tlsEquipPlan = planWithCurrentOrInitialConnectionSpec(connectionSpecs, sslSocket)
        val connectionSpec = connectionSpecs[tlsEquipPlan.connectionSpecIndex]

        // Figure out the next connection spec in case we need a retry.
        retryTlsConnection = tlsEquipPlan.nextConnectionSpec(connectionSpecs, sslSocket)

        connectionSpec.apply(sslSocket, isFallback = tlsEquipPlan.isTlsFallback)

      frameHeader(
        streamId = 0,
        length = settings.size() * 6,
        type = TYPE_SETTINGS,
        flags = FLAG_NONE,
      )
      for (i in 0 until Settings.COUNT) {
        if (!settings.isSet(i)) continue
        val id =
          when (i) {
            4 -> 3 // SETTINGS_MAX_CONCURRENT_STREAMS renumbered.
            7 -> 4 // SETTINGS_INITIAL_WINDOW_SIZE renumbered.

    // Connections are replaced if they idle out or are evicted from the pool
    evictAllConnections(pool)
    assertThat(pool.connectionCount()).isEqualTo(2)
    forceConnectionsToExpire(pool, expireTime)
    assertThat(pool.connectionCount()).isEqualTo(2)

    // Excess connections aren't removed until they idle out, even if no longer needed
    setPolicy(pool, address, ConnectionPool.AddressPolicy(1))

      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) {
        val candidate = queue.futureTasks[0]

  }

  /**
   * Returns a new locally-initiated stream.
   *
   * @param out true to create an output stream that we can use to send data to the remote peer.
   *     Corresponds to `FLAG_FIN`.
   */
  @Throws(IOException::class)
  fun newStream(
    requestHeaders: List<Header>,
    out: Boolean,
  ): Http2Stream {
    return newStream(0, requestHeaders, out)
  }

    //     connection is closed. We only close these if the idle connection limit is exceeded.
    //
    // Also count the evictable connections to find out if we must close an EVICTABLE connection
    // before its keepAliveDurationNs is reached.
    var earliestOldIdleAtNs = (now - keepAliveDurationNs) + 1
    var earliestOldConnection: RealConnection? = null

    redQueue.execute("task") {
      log += "run@${taskFaker.nanoTime}"
    }

    val idleLatch = redQueue.idleLatch()
    assertThat(idleLatch.count).isEqualTo(1)

    taskFaker.advanceUntil(0.µs)
    assertThat(log).containsExactly("run@0")

    assertThat(idleLatch.count).isEqualTo(0)
  }

  @Test fun multipleCallsToIdleLatchReturnSameInstance() {
    redQueue.execute("task") {