"context"

	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/tools/cache"
)

type Controller[T runtime.Object] interface {
	// Meant to be run inside a goroutine
	// Waits for and reacts to changes in whatever type the controller
	// is concerned with.
	//
	// Returns an error always non-nil explaining why the worker stopped
	Run(ctx context.Context) error

// defined in package runtime

// Semacquire waits until *s > 0 and then atomically decrements it.
// It is intended as a simple sleep primitive for use by the synchronization
// library and should not be used directly.
func runtime_Semacquire(s *uint32)

// Semacquire(RW)Mutex(R) is like Semacquire, but for profiling contended
// Mutexes and RWMutexes.
// If lifo is true, queue waiter at the head of wait queue.

// when f will run, in which case Reset returns true, or schedules f
// to run again, in which case it returns false.
// When Reset returns false, Reset neither waits for the prior f to
// complete before returning nor does it guarantee that the subsequent
// goroutine running f does not run concurrently with the prior
// one. If the caller needs to know whether the prior execution of

				}
			}
		}

		// Incorporate updates from sender into local copy.
		for i := range sig.mask {
			sig.recv[i] = atomic.Xchg(&sig.mask[i], 0)
		}
	}
}

// signalWaitUntilIdle waits until the signal delivery mechanism is idle.
// This is used to ensure that we do not drop a signal notification due
// to a race between disabling a signal and receiving a signal.

type exitStatus struct {
	err error
}

// Run starts the envoy and waits until it terminates.
// There are a few exit paths:
//  1. Envoy exits. In this case, we simply log and exit.
//  2. /quitquitquit (on agent, not Envoy) is called. We will set skipDrain and cancel the context, which triggers us to exit immediately.

		// shutting down, so give it some time.
		time.Sleep(1 * time.Millisecond)
	}
	t.Errorf("Test appears to have leaked %s:\n%s", bad, stacks)
}

// waitCondition waits for fn to return true,
// checking immediately and then at exponentially increasing intervals.
func waitCondition(t testing.TB, delay time.Duration, fn func(time.Duration) bool) {
	t.Helper()
	start := time.Now()

//      MAXLOG = 8.8029691931113054295988e+01 = log(2**127)
//      MINLOG = -8.872283911167299960540e+01 = log(2**-128)
//
// A rational function is used for |x| < 0.625.  The form
// x + x**3 P(x)/Q(x) of Cody & Waite is employed.
// Otherwise,
//      tanh(x) = sinh(x)/cosh(x) = 1  -  2/(exp(2x) + 1).
//
// ACCURACY:
//
//                      Relative error:
// arithmetic   domain     # trials      peak         rms

 	- the HTTP Server stops listening immediately
	- any new request arriving on a new TCP socket is denied with
      a network error similar to 'connection refused'
    - the HTTP Server waits gracefully for existing requests to complete
      up to '60s' (dictated by ShutdownTimeout)
	- active long running requests will receive a GOAWAY.

T0+70s: HTTPServerStoppedListening:

	wg sync.WaitGroup
	// Once Wait is initiated, all consecutive Done invocation will be
	// rate limited using this rate limiter.
	limiter RateLimiter
	stopCtx context.Context

	mu sync.Mutex
	// wait indicate whether Wait is called, if true,
	// then any Add with positive delta will return error.
	wait bool
	// number of request(s) currently using the wait group
	count int
}

			target.Add(1)
		}()
	}
	wg.Wait()

	waitingCh := make(chan struct{})
	wg.Add(n)
	for i := 0; i < n; i++ {
		go func() {
			defer wg.Done()

			<-waitingCh
			target.Done()
		}()
	}
	defer wg.Wait()

	now := time.Now()
	t.Logf("Wait starting, N=%d, grace: %s, at: %s", n, grace, now)