}
  }

  @Throws(IOException::class)
  fun flush() {
    withLock {
      if (closed) throw IOException("closed")
      sink.flush()
    }
  }

  @Throws(IOException::class)
  fun rstStream(
    streamId: Int,
    errorCode: ErrorCode,
  ) {
    withLock {
      if (closed) throw IOException("closed")
      require(errorCode.httpCode != -1)

      writerQueue.schedule("$connectionName ping", pingIntervalNanos) {
        val failDueToMissingPong =
          withLock {
            if (intervalPongsReceived < intervalPingsSent) {
              return@withLock true
            } else {
              intervalPingsSent++
              return@withLock false
            }
          }
        if (failDueToMissingPong) {
          failConnection(null)

    if (!flushHeaders) {
      withLock {
        flushHeaders = (connection.writeBytesTotal >= connection.writeBytesMaximum)
      }
    }

    connection.writeHeaders(id, outFinished, responseHeaders)

    if (flushHeaders) {
      connection.flush()
    }
  }

  fun enqueueTrailers(trailers: Headers) {
    withLock {
      check(!sink.finished) { "already finished" }

    while (i.hasNext()) {
      val connection = i.next()
      val socketToClose =
        connection.withLock {
          if (connection.calls.isEmpty()) {
            i.remove()
            connection.noNewExchanges = true
            return@withLock connection.socket()
          } else {
            return@withLock null
          }
        }
      if (socketToClose != null) {
        socketToClose.closeQuietly()

  override fun noNewExchanges() {
    withLock {
      noNewExchanges = true
    }
    connectionListener.noNewExchanges(this)
  }

  /** Prevent this connection from being used for hosts other than the one in [route]. */
  internal fun noCoalescedConnections() {
    withLock {
      noCoalescedConnections = true
    }
  }

import okhttp3.internal.computeIfAbsent
import okhttp3.internal.concurrent.Lockable
import okhttp3.internal.concurrent.assertLockHeld
import okhttp3.internal.concurrent.assertLockNotHeld
import okhttp3.internal.concurrent.withLock
import okhttp3.internal.http.BridgeInterceptor
import okhttp3.internal.http.CallServerInterceptor
import okhttp3.internal.http.RealInterceptorChain
import okhttp3.internal.http.RetryAndFollowUpInterceptor

            task = withLock {
              afterRun(task, delayNanos, true)
              awaitTaskToRun()
            } ?: return
          }
        } catch (thrown: Throwable) {
          // A task failed. Update execution state and re-throw the exception.
          withLock {
            afterRun(task, -1L, false)
          }

    override fun poll(
      timeout: Long,
      unit: TimeUnit,
    ): T? {
      return taskRunner.withLock {
        val waitUntil = nanoTime + unit.toNanos(timeout)
        while (true) {
          val result = poll()
          if (result != null) return@withLock result
          if (nanoTime >= waitUntil) return@withLock null
          val editCountBefore = editCount

import okhttp3.Request
import okhttp3.TestUtil.awaitGarbageCollection
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.concurrent.TaskRunner.RealBackend
import okhttp3.internal.concurrent.withLock
import okhttp3.internal.http2.MockHttp2Peer
import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.Test

class ConnectionPoolTest {
  private val routePlanner = FakeRoutePlanner()

   */
  fun cancelAll() {
    taskRunner.assertLockNotHeld()

    taskRunner.withLock {
      if (cancelAllAndDecide()) {
        taskRunner.kickCoordinator(this)
      }
    }
  }

  fun shutdown() {
    taskRunner.assertLockNotHeld()

    taskRunner.withLock {
      shutdown = true
      if (cancelAllAndDecide()) {
        taskRunner.kickCoordinator(this)
      }