activeAt, activeNow, err := target.Wait(func(count int) (RateLimiter, context.Context, context.CancelFunc) {
		defer close(waitingCh)
		// no deadline in context, Wait will wait forever, we want to measure
		// how long it takes for the requests to drain.
		return rate.NewLimiter(rate.Limit(n/int(grace.Seconds())), 1), context.Background(), func() {}
	})
	took := time.Since(now)

				if unlock, ok := val.(chan struct{}); ok && unlock != nil {
					// Wait until unfrozen.
					select {
					case <-unlock:
					case <-r.Context().Done():
						// if client canceled we don't need to wait here forever.
						return
					}
				}
			}
		}

		globalHTTPStats.addRequestsInQueue(1)
		pool, deadline := globalAPIConfig.getRequestsPool()
		if pool == nil {
			globalHTTPStats.addRequestsInQueue(-1)

	if err != nil {
		t.Fatal("close error:", err)
	}
	err = client.Call("Arith.Add", &Args{7, 9}, new(Reply))
	if err != ErrShutdown {
		t.Errorf("Forever: expected ErrShutdown got %v", err)
	}
}

// Tests the fix to issue 11221. Without the fix, this loops forever or crashes.
func TestAcceptExitAfterListenerClose(t *testing.T) {
	newServer := NewServer()
	newServer.Register(new(Arith))

      @Override
      public int read(char[] cbuf, int off, int len) throws IOException {
        // if a buffer isn't being cleared correctly, this method will eventually start being called
        // with a len of 0 forever
        if (len <= 0) {
          fail("read called with a len of " + len);
        }
        // read fewer than the max number of chars to read
        // shouldn't be a problem unless the buffer is shrinking each call

      @Override
      public int read(char[] cbuf, int off, int len) throws IOException {
        // if a buffer isn't being cleared correctly, this method will eventually start being called
        // with a len of 0 forever
        if (len <= 0) {
          fail("read called with a len of " + len);
        }
        // read fewer than the max number of chars to read
        // shouldn't be a problem unless the buffer is shrinking each call

	"istio.io/istio/pkg/model"
	"istio.io/istio/pkg/slices"
	"istio.io/istio/pkg/wasm"
)

// sendDeltaRequest is a small wrapper around sending to con.requestsChan. This ensures that we do not
// block forever on
func (con *ProxyConnection) sendDeltaRequest(req *discovery.DeltaDiscoveryRequest) {
	con.deltaRequestsChan.Put(req)
}

	}
}

func testCacheEvicter(c ExpiringCache) {
	c.SetWithExpiration("A", "A", 1*time.Millisecond)

	// loop until eviction happens. If eviction doesn't happen, this loop will get stuck forever which is fine
	for {
		time.Sleep(10 * time.Millisecond)

		_, ok := c.Get("A")
		if !ok {
			// item disappeared, we're done
			return
		}
	}
}

	lastVerified atomic.Value
}

func (l *log) Name() string {
	return "log"
}

func (l *log) Check(_ *http.Request) error {
	l.startOnce.Do(func() {
		l.lastVerified.Store(time.Now())
		go wait.Forever(func() {
			klog.Flush()
			l.lastVerified.Store(time.Now())
		}, time.Minute)
	})

	lastVerified := l.lastVerified.Load().(time.Time)
	if time.Since(lastVerified) < (2 * time.Minute) {
		return nil
	}

   * colliding threads.  Because search is random, and collisions
   * only become known via CAS failures, convergence can be slow,
   * and because threads are typically not bound to CPUS forever,
   * may not occur at all. However, despite these limitations,
   * observed contention rates are typically low in these cases.
   *
   * It is possible for a Cell to become unused when threads that

    * Normally, a token is set to expire after some time.
        * So, the user will have to log in again at some point later.
        * And if the token is stolen, the risk is less. It is not like a permanent key that will work forever (in most of the cases).
* The frontend stores that token temporarily somewhere.
* The user clicks in the frontend to go to another section of the frontend web app.
* The frontend needs to fetch some more data from the API.