type Stream struct {
	// responses from the remote server.
	// Channel will be closed after error or when remote closes.
	// All responses *must* be read by the caller until either an error is returned or the channel is closed.
	// Canceling the context will cause the context cancellation error to be returned.
	responses <-chan Response
	cancel    context.CancelCauseFunc

	// Requests sent to the server.

	for {
		select {
		case <-m.ctx.Done():
			return
		case <-t.C:
			last := time.Since(time.Unix(atomic.LoadInt64(&m.LastPing), 0))
			if last > 4*m.clientPingInterval {
				gridLogIf(m.ctx, fmt.Errorf("canceling remote connection %s not seen for %v", m.parent, last))
				m.close()
				return
			}
		}
	}
}

// checkSeq will check if sequence number is correct and increment it by 1.

				// HTTP/2 requests are not cancelable with CancelRequest,
				// so we have no further need for the request context.
				//
				// On the HTTP/1 path, roundTrip takes responsibility for
				// canceling the context after the response body is read.
				cancel(errRequestDone)
			}
			resp.Request = origReq
			return resp, nil
		}

		// Failed. Clean up and determine whether to retry.

	}

	if z.SinglePool() {
		return errInvalidArgument
	}

	z.poolMetaMutex.Lock()
	defer z.poolMetaMutex.Unlock()

	fn := z.decommissionCancelers[idx]
	if fn == nil {
		// canceling a decommission before it started return an error.
		return errDecommissionNotStarted
	}

	defer fn() // cancel any active thread.

	if z.poolMeta.DecommissionCancel(idx) {

			if tc.expectedCipher != hs.suite.id {
				t.Errorf("unexpected cipher chosen: want %d, got %d", tc.expectedCipher, hs.suite.id)
			}
		})
	}
}

// TestServerHandshakeContextCancellation tests that canceling
// the context given to the server side conn.HandshakeContext
// interrupts the in-progress handshake.
func TestServerHandshakeContextCancellation(t *testing.T) {
	c, s := localPipe(t)

			// (Perhaps c.Wait hadn't been called, or perhaps it happened to race with
			// c.ctx being canceled.) Don't inject a needless error.
		} else {
			err = wrappedError{
				prefix: "exec: canceling Cmd",
				err:    interruptErr,
			}
		}
	}
	if c.WaitDelay == 0 {
		resultc <- ctxResult{err: err}
		return
	}

	timer := time.NewTimer(c.WaitDelay)
	select {

			// Panic instead of calling t.Fatal so that we get a goroutine dump.
			// We want to know exactly what the os/exec goroutines got stuck on.
			debug.SetTraceback("system")
			panic("canceling context did not stop program")
		}

		// Back off exponentially (up to 1-second sleeps) to give the OS time to
		// terminate the process.
		delay *= 2
		if delay > 1*time.Second {

	go func() {
		_, err := cl.Do(req)
		eventLog.Printf("Get error = %v", err != nil)
		test.checkErr("Get", err)
		gotres <- true
	}()

	inDial <- true

	eventLog.Printf("canceling")
	test.cancel(tr, req)
	test.cancel(tr, req) // used to panic on second call to Transport.Cancel

	if d, ok := t.Deadline(); ok {
		// When the test's deadline is about to expire, log the pending events for

type Response struct {
	Msg []byte
	Err error
}

func newMuxClient(ctx context.Context, muxID uint64, parent *Connection) *muxClient {
	ctx, cancelFn := context.WithCancelCause(ctx)
	return &muxClient{
		MuxID:              muxID,
		ctx:                ctx,
		cancelFn:           cancelFn,
		parent:             parent,
		LastPong:           time.Now().UnixNano(),
		BaseFlags:          parent.baseFlags,

func (m *kubeletServerCertificateDynamicFileManager) Start() {
	var ctx context.Context
	ctx, m.cancelFn = context.WithCancel(context.Background())
	go m.dynamicCertificateContent.Run(ctx, 1)
}

// Stop stops watching the certificate and key files
func (m *kubeletServerCertificateDynamicFileManager) Stop() {
	if m.cancelFn != nil {
		m.cancelFn()
	}
}